Indonesia Conference Directory

Corresponding Author
Syaiful Syaiful

Institutions
Diponegoro University

Abstract
Vorticity causes many adverse effects on the area near the surface, both on moving (turbine blade) and fixed objects. Therefore, this study attempts to investigate the effects of free-stream turbulence on trailing edge vortex on the NACA 0015 airfoil profile. This research was conducted using two-dimensional numerical simulations. To determine the interaction of vortex and free stream turbulence, two variations of turbulent intensity were given, namely 0.5% and 4.6% with Reynolds number of 1.6 x 105. The k-e turbulence model was used in the current study. The angle of attack of the flow towards the airfoil was varied from 0 deg. to 25 deg. in conditions of increase and decrease in the horizontal position of the airfoil. The result was found that there is an agreement between the simulation and the experiment result. Increased turbulent intensity can delay the stall condition, the stall process begins to be observed after the 12 deg. attack angle at 0.5% turbulent intensity while at turbulent intensity 4.6% the stall process was found after the 15deg. attack angle. From a velocity streamline, it was found that an increase in turbulent intensity can inhibit vortex growth.

Keywords
Free stream turbulence, Trailing edge vortex, NACA 0015, Turbulent intensity

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/vpQMVaWHum3R

Corresponding Author
Desi Nur Liana

Institutions
(1)Department of Vocational Teacher of Education, Sebelas Maret University, Jl. Ir. Sutami 36A, Surakarta, Indonesia
(2)Department of Mechanical Engineering Education, Sebelas Maret University, Jl. Ahmad Yani No.200, Pabelan, Surakarta, Indonesia

Abstract
The potential energy analysis of biomass waste as a sustainable source of energy continues to increase with various design to obtain maximum efficiency. Modification of the type of material, diameter, and length of the connecting tube between the reactor and the condenser can increase its effectiveness. The optimal parameter search for the connecting tube that produces liquid-smoke are carried out using galvanized pipes and stainless-steel pipes with variations in diameter ¼ inch, ¾ inch, and length 1 meter, 0.5 meters. Testing the quantity of liquid-smoke results on sugar palm waste samples was carried out at 400 C for 60 minutes by seeing an increase of the amount of liquid-smoke. The results of the study show variations in size and type of tube affect the product yield of the pyrolysis process. Stainless-steel pipes have better performance to produce liquid-smoke. The shorter the length of the pipe increases the quantity of liquid-smoke, but the smaller the diameter of the pipe decreases the quantity of liquid-smoke. This paper discusses in more detail the comparison of the performance of connecting tube by modifying the type of material, the length, and the diameter of the pipe.

Keywords
Biomass pyrolysis, connecting tube, liquid-smoke

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/BfzPQJ8AmLRy

Corresponding Author
Anis Roihatin

Institutions
1,3,4,5Mechanical Department, 2Electrical Department
1,2,3State Polytehcnic of Semarang
4,5National Kaohsiung University of Science and Technology, Taiwan

Abstract
Abstract-The objectives of this research numerically studies various effects on the performance of air-breathing microfluidic fuel cells for modeling the transport phenomena. The microfluidic fuel cells having a microchannel width of 1.0 mm and 50 µm in-depth with an electrode spacing of 0.3 mm. The concentration formic acid of 0.3 M, 0.5 M, and 1.0 M mixed with 0.5 M sulfuric acid (supporting electrolyte) in aqueous solution was used as fuel and another inlet a stream of 0.5 M sulfuric acid as an electrolyte which were varied at an inlet flow rate of 0.05, 0.1, and 0.5 mL/min. Firstly, a 3-D microfluidic fuel cell model was built using COMSOL Multiphysics 5.1 to simulate the fuel cell performance. Furthermore, both V-I curves obtained from simulation on different volumetric fuel flow rate. The transport phenomena in the microfluidic fuel cells were formulated with continuity equation, momentum equation, species transport equation, and charge equation. The porous media flow in the gas diffusion layer was described by Brinkman equation. The Butler-Volmer equations were applied to get the V-I curves.

Keywords
fuel cell

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/cLAUpRmbvdVX

Corresponding Author
Bambang Iskandriawan

Institutions
Institut Teknologi Sepuluh Nopember

Abstract
In line to the economics growth rate which is improved hence economics level of the family also more prosperous. It is followed by the number of vehicle more increase. Jamming problem come to be in serious situation. Not to mention the pollution problem which is caused by the exhaust gas of motor vehicle where their number always increase every year. One of the problem solutions is within the operating of bicycle as the alternative of transportation. Based on the research experience before concerning to the applied heat transfer and bicycle design also the serious reality above so the author intend to air purifier bike design. The existence of them is expected will diminish the intensity of urban air pollution in a straightaway. Secondary manner it will give suggestion and stimulus for city inhabitant in order to strive their region is more environments friendly. Repeating manufacture even design are could not be prevented when some failure are occurred in the testing stage. Follow up the problem statement of urban air pollution, limited space, city inhabitant taste likewise production competence furthermore it is answered within bring into practicality the design and prototype of air purifier bike.

Keywords
Air purifier bike; short distance transportation; air pollution; and towns

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/NxLGh8kZTgzX

Corresponding Author
kukuh mukti wibowo

Institutions
(a)Mechanical Engineering education, Teacher Training and Education Faculty, Sebelas Maret University, Jl. Ir. Sutami 36A, Jebres, Kota Surakarta 57126, Indonesia
*agung.pambudi[at]staff.uns.ac.id
(b)School of Environment and SocietyTokyo Institute of Technology

Abstract
The aim of this research is to analyze the effect of using immersion cooling with different flow rate and fan rotation on decreasing the temperature on CPU. The study used three variables of flow rate: 0.5, 1 and 1.5lpm. in addition, three other variables of fan rotation, 400, 600, and 800 rpm, were used as well.. Data collection was by means of benchmark software to load the CPU to work maximum and the logging software to record the temperature. The results show that the immersion cooling could potentially be utilized as the new and more effective cooling system. The most optimum variable to decrease the temperature was 1, 5 lpm with fan rotation at 800 rpm. It decreased the maximum temperature from 60 °C to 47 °C, a deviation of 13 °C lower compared to the conventional fan cooling system with air as a medium. The study established that the higher the flow rate and the fan rotation, the higher temperature can be decrease. Therefore, immersion cooling can be the solution to decrease the consumption of energy on IT sector on a bigger scale.

Keywords
Immersion cooling, mineral oil, flow rate

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/8cJMR4UWeDCq

Corresponding Author
Dhimas Satria

Institutions
a) Mechanical Engineering Department, Universitas Sultan Ageng Tirtayasa, Indonesia
*dhimas[at]untirta.ac.id
b) Industrial Engineering Department, Universitas Sultan Ageng Tirtayasa, Indonesia

Abstract
External combustion engine, one of those is striling machine has advantage which can utilize all type of fuel, so that it is suitable for biomass utilization application. In this study an analysis of best design selection on striling machine was conducted, different from previous study, which is innovation of design on striling machine of alpha type by making corner phase to 180o, with the purpose to reduce gravitational force when the cylinder is compressed, because the corner phase currently used is (90o) has weakness which is the cylinder wall is perpendicular, so that the compressing process is against gravitational force. The design selection method is conducted by using Quality Function Deployment (QFD) method and Pahl and Beitz method, which is started by collecting the design requirement and objective (DRO), formulating House of Quality, analysis and implementation, specification determination, level function determination, function morphology determination, and best variant determination.

Keywords
Design selection; Stirling machine; Design innovation; Biomass

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/7zWeBH2C9UxF

Corresponding Author
Dandun Mahesa Prabowoputra

Institutions
1.Graduate School of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
2.Department of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
3.Department of Naval Architecture and Marine System Engineering, Pukyong National University,Busan 48513, South Korea

Abstract
Savonius water turbine research is still growing today. One of the developments that has been made is about modification of geometry. The research that has been done aims to improve the efficiency of savonius turbines. Savonius turbine has a simple structure, and is easily applied so that research on the savonius turbine is interesting. Savonius rotor ability that can operate at low velocity is an advantage that can be combined in the process of developing renewable energy. One of the researches that develops is changes in blade shape. In this study a change in blade shape was carried out. The circular profile "S" shaped geometry is modified into a semi-circular profile "L" with an outer overlap. Research has been carried out simulations using Ansys software with CFX Solver. Savonius rotors that have been used in this study are rotors with aspect ratio 1. Simulation has been done on 3-dimensional modeling and on the properties of pure water. Mesh is performed on the workbench with the tetrahedral method, and uses the K-epsilon turbulent type. From this study it was found that blade modification into semi-circular with "L" profile and outer overlap can improve the performance of the savonius water turbine on the horizontal axis.

Keywords
Savonius Rotor, Water Turbine, CFD, Renewable Energy, Coefficient of Power

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/4LFp3fx7AQ6u

Corresponding Author
ignatius Gunawan Widodo

Institutions
Departement of mechanical engineering ,Politeknik Negeri Semarang
Jl. Prof. H. Soedarto, S.H. , Tembalang Semarang 50275

Abstract
Knowledge of vibration and the resulting data is very important for maintenance and troubleshooting where this ability can help companies reduce the occurrence of downtime and can increase profits both in terms of production and from a longer machine life. One of the causes of high vibrations is a misalignment in a centrifugal pump installation that is driven by an electric motor and connected by a fixed clutch. The method used is to do differences in height in the horizontal, vertical and angular directions by providing variations in the rotation of the electric motor and pump, then checking at four bearing positions on the electric motor and pump. The results showed an increase in vibration at each addition of the sim on the electric motor fastener bolts, the greatest vibration occurred in the MOV (indoor motor axiall) with the addition of a 1.5mm sim of 3.01 mm / sec an average increase of 29% and at the largest pump vibration in POA (outdoor axial pump) with the addition of a 1.5mm sim of 9.88mm / sec, increased by an average of 58%. Keywords:

Keywords
misalignment, increase in vibration, adjustment

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/nXpJjQva9BwZ

Corresponding Author
Ikhwan Taufik

Institutions
1)Universitas Tidar, Fakultas Teknik, Jl. Kapten Suparman 39, Magelang, 56116, Indonesia.
2)Universitas Gadjah Mada, Departemen Teknik Mesin dan Industri, Jl. Grafika 2, Yogyakarta, 55281, Indonesia.

a)ikhwantaufik26[at]untidar.ac.id, b)herianto[at]ugm.ac.id,
c)herliansyah[at]ugm.ac.id, d)arifrahmansaleh[at]untidar.ac.id, e)fuadhilmy[at]untidar.ac.id

Abstract
Surface quality is one of the most important factor of merit in 3D printing products. Surface roughness of the 3D printing product can be affected by vibration. This article aims to analyze the impact of vibration on the surface roughness of 3D printing products will be explained in this article. The type of 3D printing machine used is Cartesian with FDM (Fused Deposition Modelling) technology, the kind of material filament used is PLA (Polylactic Acid), and the result can be seen by the picture and also from the measuring result with profilometer.

Keywords
3D Printing, FDM, Vibration, Surface Roughness.

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/QBkT6CDLAJy4

Corresponding Author
Hendriko Hendriko

Institutions
Mechatronics Engineering Department, Politeknik Caltex Riau, Rumbai, Pekanbaru, 28265 Indonesia

Abstract
This paper presents a simple analytical approach to define cut geometry of multi-pass rough milling during a free-form surface milling. The shape of in-process workpiece surface was identified using the coordinate of corner points that are found in every step of stair surface. In every instantaneous tool location, the workpiece sections that have possibility intersecting with the cutting edge were identified based on the coordinate of cutter location point. The algorithm was developed for machining using indexable flat end-mill by considering the effect of helix angle to the cut geometry. The proposed method was successfully used to determine the length of cut and generated the shape of cuts. The validation of the accuracy was carried out by comparing the length of cut measured using CAD software with those generated by the proposed approach. The results demonstrate that the proposed algorithm was accurate. Moreover, the test validated that the helix angle tends to produce larger cut.

Keywords
multi-pass rough milling, free-form surface, analytical boundary method, helix angle, five-axis milling

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/tjBbTgf2urwz

Corresponding Author
Rina Lusiani

Institutions
Mechanical Engineering Department, Universitas Sultan Ageng Tirtayasa

Abstract
In order to increase the use of new renewable biomass energy in Indonesia, various methods are carried out, one of which is to increase gasification efficiency and performance. One way to improve efficiency and performance is to use a furnace that matches the characteristics of the gas produced. This study aims to design an appropriate gasification furnace. In this study we will cook liquid palm sugar on the vaccum drier and compare the performance and efficiency using and without using a gasification furnace with rice husk biomass. The test results showed a significant increase in performance and efficiency with the use of this furnace.

Keywords
Gasification, Stoves, Vaccum Driers

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/NVjJHfuQC7vq

Corresponding Author
Anis Roihatin

Institutions
1 Mechanical Engineering, 2,3Electrical Engineering
1,2,3State Polytechnic of Semarang

Abstract
Abstract - There are six state polytechnics aged 36 years old in Indonesia. The six polytechnics have machining workshops with the same number and machines. The problem that arises in Semarang State Polytechnic is the maintenance system that has not been integrated into a system, even though the electronic maintenance and repair activities have been carried out. The purpose of this study is to develop a maintenance information system that can control all of its activities well. The system is built with an object-oriented approach implemented by android. Research results include: database systems, web application systems, and android application systems that have delivered output correctly.

Keywords
Keywords— maintenance, machining, workshop, android

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/dYbQrgkqTZFG

Corresponding Author
Liliek Triyono

Institutions
1, 2,4 Mechanical Department, 3 Accounting Departments
1,2,3,4State Polytechnic of Semarang

Abstract
Abstract—The development of a Computer Numerical Controller (CNC) machine specifically for the manufacture of creative product crafts needs to be encouraged to improve the variety and quality of the products. Manual engraving of natural stone (marble, granite) by relying on the skills of people and simple equipment will produce a product with a long time of processing. Competition in the business and industrial world is needed to increase effectiveness and efficiency with short manufacturing time indicators, low prices, more and more interesting design variations. The research objective is to find effective and efficient machining parameters, analyze factors that influence surface roughness, and enrich the variety of creative product designs of marble stone materials. This study uses an experimental method approach which is a study to find the effect of spindle rotation variables, infeed speed, infeed depth on the quality of surface roughness by operating the CNC Machine Router 3-Axis. It was found that the the following parameters of the machine are cutting speed machining 30 (m / min), spindle rotation 12000 (rpm), and speed / feed rate 2000 (mm / min). Analysis of factors that influence the surface roughness of marble engraver the higher the speed / rate of infeed and the depth of infeed, the higher the surface roughness value of marble. Computer and engineering software applications are able to increase the variety of creative product designs.

Keywords
Keywords—CNC Router, engravired, granite, marble

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/JUj6WQ9cgXFR

Corresponding Author
Zaenal Abidin

Institutions
Departement of Mechanical Enginnering, Politeknik Negeri Semarang
Jl. Prof. H. Soedarto, S.H., Tembalang Semarang 50275

Abstract
PT. Indonesia Power UJP Central Java 2 Adipala is a 1 x 660 MW steam power plant with coal as its main fuel. Distribution of coal using Belt Conveyor 1 AB, 2 AB, 7 to the coal yard. The background of the problem is the process of releasing idlers on conveyors 1AB, 2AB, 7 takes a long time of 7 minutes 54 seconds. Idler replacement is done in the conventional way by hitting the idler with a hammer until it is released from the conveyor frame. The cause of the problem is the rust of the idler shaft on the conveyor frame and the process of releasing the idler in the conventional way. The impact of the problem is the conventional replacement of idlers making coal dust fly so that coal dust enters the respiratory system and the eyes and much. In addition, conveyor production time is lost due to a long replacement. The purpose of this research is to design an Idler lifter tool to accelerate the carrying idler release time on the conveyor. The research solution is to design an Idler lifter with a Hydraulic jack mechanism to lift the idler from the conveyor so that the idler release time can be reduced and does not make coal dust fly. Confirm solution was the result of research which included reducing idler release time by 3 minutes 49 seconds or reducing replacement time by 51.687% so that the amount of coal distributed was more than 62,553,859 tons and human labor was reduced by 90,744% in sloping position and 89.31% in flat position using the Idler lifter tool

Keywords
Conveyor, Idler, Idler lifter

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/YNAjhB9UgxbK

Corresponding Author
Dandun Mahesa Prabowoputra

Institutions
1.Department of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
2.Graduate School of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
3. Interdisciplinary Program of Marine Convergence Design, Pukyong National University, Busan 48513, South Korea

Abstract
Environmental risk due to excessive residual emission from fossil-based fuel on transportation engine and industrial process is rising as market rivalry becomes intensive between superpower countries. Greenhouse effect, ice melting in Arctic, reduction of air quality are several of main concerns which need immidiate development and change. Energy harvesting equipment is one of the key solutions. environment potential, e.g. Water resource can be collaborated with mechanical equipment to harvest clean energy. Savonius water turbine has been proposed and studied for this purpose and can be placed on several water resources. Still, real-world implementation of this technology is lack, especially in tropical archipelago countries which have abundant water resource. In this work, assessment of savonius water turbine as instrument to harvest clean energy is conducted. Reduction of air pollution is estimated in order to provide environmental signification as affected by savonius in producing alternative clean energy.

Keywords
savonius water turbine, water resource and flow, geographical area, non-fossil energy, emission reduction

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/xAFaPegEzjUC

Corresponding Author
Gunawan Gunawan

Institutions
Universitas Indonesia

Abstract
Recently, the shipbuilding industry has been able to develop new production methods. This new methods promotes design automation in order to produce ships more efficiently. Engine room design, including the piping system, is a complex process especially in the pipe routing problem. This process requires a considerable number of man hours. This paper presents a new approach for optimization of pipe routing system. The Dijkstra-s algorithm is used to obtain short path by considering some constraints like number of pipe bends and pipe cross. The method works by generating some candidate paths based on the given paramaters geometrically. The non-geometric paramaters such as material cost and installation cost will also be assesed. Then by using the algorithm, the desire option from various candidate paths will be evaluated. This study discusses the details of the above methods. In addition, simulation test of a several piping systems were carried out to illustrate the pipe routing design procedure in detail and to verify the effectiveness of the proposed methodology.

Keywords
Pipe Routing; Optimization; Piping system; dijkstra algorithm

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/Anu4HLgDaeMB

Corresponding Author
Teuku Edisah Putra

Institutions
Department of Mechanical Engineering – Universitas Syiah Kuala
Darussalam, Banda Aceh 23111, Indonesia
*edi[at]unsyiah.ac.id

Abstract
This study aims to identify the effect of road surface contours on the fatigue life of a coil spring and a lower arm. In this study, strain gauges were installed at the critical points of the components based on stress distributions. According to the chemical composition tests, the coil spring was made from SAE 5160 and lower arm was made from AISI 1513. Strain signals obtained were analyzed using the Coffin-Manson, Morrow, and Smith-Watson-Topper models. Based on the strain signals, it was found that when the vehicle was driven on the rough road, coil spring and lower arm received higher stresses contributing to a shorter fatigue life. The fatigue life of the coil spring when was driven on the rough road was 7 % lower than when was driven on the smooth road. Meanwhile the fatigue life of the lower arm when was driven on the rough surface was only 0.03 % lower than when was driven on the smooth road. It indicated that the coil spring will fail faster than the lower arm. This is because the contour of the road surfaces provide a vertical load so that it is in accordance with the function of the coil spring which works to reduce the load vertically, while the lower arm functions to hold the load when turning.

Keywords
Vibration, stress, strain, failure.

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/hxqKBUZW3Dnm

Corresponding Author
Febrio Hani Syamnur

Institutions
a) Mechanical Engineering Education, Sebelas Maret University, Jl. Ir. Sutami No. 36A, Surakarta, Indonesia
*agung.pambudi[at]staff.uns.ac.id
b)School of Environment and Society, Tokyo Institute of Technology, 2 Chome-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Abstract
Electric Vehicle (EV) is one of the technologies in the transportation sector that can reduce the amount of emissions. However, EV still faces some difficulties in terms of implementation. its application in several countries is still far from competing with Internal Combustion Engine (ICE) vehicles. Public acceptance of EV is considered as one of the obstacles. Therefore, this study will examine public perceptions of price, performance, and infrastructure and acceptance of this technology. Furthermore, an incentive policy that can be applied is also offered to respondents. The survey method with a quantitative approach is carried out in Indonesia with a population of Surakarta City residents. The results of this study can contribute as a reference for policy makers in drafting energy and transportation policies and as a discussion material for EV companies in their development.

Keywords
Electric Vehicles, public acceptance, public perception, transportation, energy policy

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/gUXpHeJDhj8M

Corresponding Author
DPPJ UMMagelang

Institutions
(a) Automotive Engineering Department, Universitas Muhammadiyah Magelang, Magelang, Indonesia
*Corresponding author: saifudin[at]ummgl.ac.id

Abstract
A minor breakdown of the cooling system will cause engine overheating. One of the factors causing the engine overheating is the crust on radiator of cooling system. Based on the problem, therefore, corrosion on the cooling system, especially radiator, should be controlled. There are some methods in controlling the corrosion; one of them is the inhibitor treatment. The research aims to know the corrosion mechanism, the corrosion type, and the kind of inhibitor that produces the lowest corrosion rate. The tool used to measure the chemical composition of the radiator is spectrometer, while microscope optic is used to know the radiator corrosion type. The corrosion rate testing is used three electrode cells according to tafel extrapolation method. The results of the test of the nitric acid inhibitor treatment with the addition of various methods showed that the most optimal result is on the addition of nitric acid inhibitor by 5%. It is proven by the decrease of corrosion rate from 0,002207 mmpy to 0,00171 mmpy.

Keywords
Corrosion; Inhibitor; Radiator

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/Krfht3eAnjMw

Corresponding Author
Hans Thiery Tjong

Institutions
Mechanical Engineering Universitas Indonesia

Abstract
The analysis of central mass system has developed the stability control over devices by applying Newton-s law of central gravity. The central mass of a body can be shifted to a desired position for stability. The moment system can be applied in predicting central mass position in order to keep the body from falling over a slope by calculating speed, mass and central mass position. This system will be implemented by liquid movement or other object movement which will shift the central mass position.

Keywords
amateur, assistance, bicycle, stability

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/QVwahNF8CdJT

Corresponding Author
Felix Dionisius

Institutions
Department of Mechanical Engineering
Politeknik Negeri Indramayu

Abstract
Biogas is an alternative fuel in the form of gases derived from dirt or waste. In general, biogas is used as a fuel source for cooking stoves for daily needs. The stove has a special design so it has not been reached by the community, especially in the countryside. One alternative to solve this problem was to modify the spuyer of stove of conventional LPG to be compatible with biogas fuel. The purpose of this paper was to determine the ability of conventional LPG stoves in terms of flame length to the diameter of the spuyer hole on the stove. The variation of the hole was 2; 2.5; 3; and 3.5 mm in diameter. The conventional LPG stove used the Rinai RI-511E type with medium of input control. While the biogas pressure from the digester to the stove was 0.106 MPa. The results showed an increase in flame length from 30.79 mm to 166.95 mm if the spuyer diameter was enlarged from 2 mm to 3.5 mm. So that the increase of flame length could reach 442.22%.

Keywords
biogas, dirt, conventional stove, flame length, spuyer

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/A4UfTGMLNvCW

Corresponding Author
norman iskandar

Institutions
(a) Department of Mechanical Engineering, University of Diponegoro
Jl. Prof. Sudharto SH, Tembalang Semarang 50275, Indonesia
*norman.undip[at]gmail.com
(b) Department of Mechanical Mechanical Engineering, Semarang State University
Jalan Taman Siswa Sekaran, Gunungpati Semarang, 50229

Abstract
Central Java and East Java are provinces in Indonesia which have the largest area of teak forest where management is in PERHUTANI. Teak trees can be cut down after reaching the age of 10 years or meet the minimum stem diameter required. Utilization of teak wood for the needs of building materials and furniture is very high because the material is of good quality. In processing teak tree trunks, there is waste from cutting that has not been maximized by PERHUTANI. With good quality teak wood, try to learn about the utilization of PERHUTANI teak wood waste powder for use as a bio-pellet that is included in the Renewable Energy category so that they can improve their use and economic functions. value. The bio-pellet quality reference standard refers to the SNI standard. To make bio-pellets, flat die mill type machines are used with speeds of 1660 rpm. As an adhesive used cassava flour with a variation of 5%; 10%; 15% and water variations 10%; 15%; 20% by weight teak wood dust. Compaction pressure variations are obtained by adjusting the gap between the roller and die with the distance 0.5mm, 1mm and 1.5mm. In research conducted content contained in teak wood pellets can meet SNI product standards. The five SNI standards obtained were bio-pellets having calorific values greater than 4000 calories/gram, bound carbon values ≥ 14%. Volatile content is less than ≤ 80%, ash content ≤ 1.5% and has a density of ≥ 0.8. This shows that bio-pellets from teak wood waste can be used for rural communities and can be developed for industrial purposes.

Keywords
biomass; bio-pellets; renewable energy; teak wood; cassava starch; SNI

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/7R4UxJY9XmBc

Corresponding Author
Feblil Huda

Institutions
1Department of Mechanical Engineering, University of Riau,
2Department of Mechanical Engineering, Andalas University,

Abstract
Chatter is frequently problem experienced in the area of machining process which brings down machining productivity and surface quality. Therefore, reliable and intense chatter detection methods are needed to maintain machining quality. In this study, turning chatter detection approach by using sound signal and simple microphone is proposed to get an accurate, simple and low cost detection method. For that purpose, an experimental set-up which consist of operating turning machine, simple microphone and personal computer (PC) with sound card is arranged. The chatter in turning process is stimulated by applying an artificial wear to the cutting tool. The sound signal data from normal and with chatter turning process are then grabbed by simple microphone and PC with sound card. The sound signals are then evaluated by Fast Fourier Transfom (FFT) and Wavelet Transform (WT) for normal and chatter conditions. Both of conditions data are then compared to get the characteristic of sound signal in chatter. It is found that signals in frequency domain, time-frequency and spectrogram have significant magnitude spike in chatter condition. 3-D spectrogram exhibits a special contours which signs the existence of chatter. The results demonstrate that the proposed method can conscientiously identify the chatter.

Keywords
Chatter detection; Sound signal; Simple microphone; Fast Fourier Transform; Wavelet Transform

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/QHRvnXr6cxWL

Corresponding Author
RINI SETIATI

Institutions
Petroleum Engineering Departement , FTKE, Universitas Trisakti , Jakarta

Abstract
This field X well production has indeed occurred in the sand and this well has been carried out with waterflooding with injection water that is currently available. In this study of sand problems it is intended to find out the cause of the problem of sandiness in terms of laboratory analysis of formation rock samples and injection fluid. Laboratory analysis consists of fluid characterization, rock characterization that is specifically assigned to rock minerals (SEM and XRD), and fluid injection compatibility tests with rocks, then a sand retention test is performed. After the addition of clay stabilizer in injection water, Zone A, Zone B and Zone C have increased apparent permeability to reach an interval of 500% -1000% mD. The use of Zetpass cannot be used in zone A because there is a lot of clay and the grain is very fine, but it can be used in zones B and C. Fluid interactions with rock minerals and chemical interactions will reduce the cementation of rocks so that they can trigger the occurrence of sand. Clay stabilizer is important to note in wells that have done waterflooding. ZetPas solution is able to become sand control but has limitations.

Keywords
sand problem, clay stabilizer, zetpas, sand control

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/MPzcfa36LBGd

Corresponding Author
Agus Pramono

Institutions
Department of Metallurgy, Faculty of Engineering, University of Sultan Ageng Tirtayasa. Jl. Jend Sudirman km. 3 Cilegon Banten 42435 Indonesia

Department of Production Management, Faculty of Mechanical Engineering, Polytechnic University of Tirana, Mother Teresa No.4 1001 Tirana, Albania

Abstract
The technology of severe plastic deformation (SPD) is process on forming metals of large plastic strain used for mass production in order to make ultrafined-grained (UFG). There are several methods used in this SPD technology, namely multi-axial forging (MAF), equal channel angular pressing-parallel channel (ECAP-PC)/accumulative press bonding (APB) and repetitive press roll forming (RPRF), various methods are potentially applied in the industrial world because they are more effective and efficient compared to conventional methods. Through research on the characterization of aluminum-based composite materials with several SPD methods, the ideal variable will be obtained in producing high-strength materials. The development of a new SPD method driven by requirements simplifies the process, so that it can be applied to mass production, some of the development of SPD technology is able to produce high plastic strain. The market for nanostructured materials produced by SPD technology is in sectors where superior traits, such as specific strength or increased fatigue age, are needed by analysis of market application. Formal market analysis in nanostructured metals, carried out by Metallicum, has found more than 100 specific markets for nano metals in space, transportation, medical equipment, chemical processing, electronics, and defense. However, due to the still high operational costs, the application of nanotechnology is still limited to military equipment applications. This research is a comparison of several SPD methods (MAF, ECAP-PC/APB and RPRF) in the scope of advanced manufacture forming fabrication to utilize multi pressing applied to aluminum alloys and aluminum-based composites to produce material properties needed by armor material for defense equipment applications.

Keywords
Severe Plastic Deformation, Aluminum, composite based and ultra-fined grained

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/BwdxZMXfqReW

Corresponding Author
Kamin Sumardi

Institutions
Mechanical Engineering Education Department, FPTK
Universitas Pendidikan Indonesia

Abstract
This study is to compare the performance of synthetic refrigerants with hydrocarbons with variations in heat in residential AC units. The test method used is an experiment. Testing using split AC residential 1 HP. Paramter is tested, namely: effective energy ratio (EER), coefficient of performance (CoP), refrigeration effect (RE), amount of refrigerant flowing, pressure, temperature, and electricity consumption. The results showed that in general the performance of R-1270 is better than synthetic refrigerants. The EER, CoP, and RE R-1270 are greater than synthetic refrigerants. This value indicates that the R-1270 has a greater performance. The amount of refrigerant flowing, pressure, and energy consumption of electricity R-1270 are smaller than synthetic refrigerants. The data shows that R-1270 is more efficient than synthetic refrigerants. The lowest temperature that can be achieved by R-1270 is 1-2 oC higher than synthetic refrigerant. The difference does not have a big effect on the room to be conditioned. Comparison of performance with R-290 hydrocarbon refrigerants, R-1270 performance is still slightly below the performance of R-290. The difference is because the material used by the two hydrocarbons is different. The conclusion of this study is that R-1270 and R-290 are more effective and efficient for use in residential air conditioners. Technically R-1270 and R-290 can replace (retrofit) R-22 and R-32 in residential AC systems.

Keywords
Hidrocarbon refrigerant, Residential air conditioning

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/KWYkFL94gBmC

Corresponding Author
Razali Thaib

Institutions
(a) Department of Mechanical Engineering, Faculty of Engineering, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
*) razalithaib[at]unsyiah.ac.id
(b) Department of Mechanical Engineering, Faculty of Engineering, Universitas Samudra, Kota Langsa, 24416, Indonesia

Abstract
In 2015, the Government through a special allocation fund has finished constructing an off-grid 15 KWp off-grid solar power plant in Paya Tampah Village, Aceh Tamiang district. Currently, it has been utilized by at least 50 heads of local transmigration families. With the lighting of renewable energy is expected to provide more value to improve peoples living standards and support educational activities in order to continue to run. The construction of this centralized solar power plant is based on the ministerial regulation of energy and mineral resources of the republic of Indonesia, year 2015 no.10, on technical guidance on the use of special allocation funds for rural energy in 2015. The long term reliability of concentrated solar power plants is highly dependent on on-site measurements because of the uncertainty in some of the ever-changing data such as irradiation value, drought rate, which can cause significant power losses and then affect the estimated cost of PV (kWh). With the aim of upgrading capabilities in off-grid solar power plant planning especially in the province of Aceh, this paper will outline in detail the comparison of the results of calculating the performance of off-grid 15 KWp off-grid solar power with system performance measurement results after 2 years of operation. Performance calculations were performed with PVsyst software and software HOME. From the measurement results obtained the total power generated by off-grid solar power plant is 12 kWp and used by 45 households. The cost incurred during installation is USD 300 thousand. From the simulation results with the same technical specifications obtained cheaper cost with the output power of 15 kWp. The results of this study are expected to be used by local governments to be a benchmark on the future planned off-grid solar power plant planning.

Keywords
Simulation, Performance, Measurement, Off-Grid PV

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/NxXrVGYWwQgf

Corresponding Author
Wayan Widhiada

Institutions
University of Udayana

Abstract
Abstract The development of prosthetic limbs in Indonesia is still conventional. Users still have difficulty to move fake legs and spend a lot of energy. These problems can be reduced by using the robotic prosthetic limbs. Bionic robot leg movements can be regulated by the implementation of a control system on the Microcontrolle. The auto tuning parameters of PID control system design is using to achieve the optimal of the responses. Beside that this research is also using the intelligence control system that is Fuzzy Logic makes it easy to create a motion control system program from a dc motor mounted on the robotic foot joint. The purpose of this study is to compare the results of the performance of the use of PID control systems and fuzzy controls. The bionic robot leg control system produce the optimal motions, accurate movement and fast response by reducing signal errors, maximum overshoot, and faster settle time.

Keywords
Bionic robot leg, PID, Fuzzy Logic, Intelligent Control, Performance of motions

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/bH4qWg3AatDN

Corresponding Author
Arif Prasetya Kurniawan

Institutions
(a) Department of Mechanical Engineering, Universitas Muhammadiyah Surakarta
Jl. Ahmad Yani Tromol Pos 1, Pabelan. Kartasura, Sukoharjo
*d200150006[at]student.ums.ac.id

(b) Department of Chemical Engineering, Universitas Muhammadiyah Surakarta
Jl. Ahmad Yani Tromol Pos 1, Pabelan. Kartasura, Sukoharjo

Abstract
The amount of agricultural waste that is underutilized and plastic waste thrown away is one of the factors of environmental pollution that is difficult to overcome. Even if you can use it well, agricultural waste and plastic waste can have economic value. This study aims to determine the impact strength of hybrid composites by utilizing corn husk waste, banana midrib waste and Polyethylene Telephthalate plastic waste as plasterboard. The way to make it is corn husk fiber and banana midrib fiber until it becomes powder, then the fiber is sieved with a 50 mesh sieve. While plastic waste is chopped to small. Furthermore, corn husk fiber powder, banana midrib fiber powder and plastic powder are mixed using epoxy resin and then cold pressed for 10 hours. Data is collected by means of testing tensile strength. From the results of the study it can be concluded that corn husk fiber, banana midrib fiber and Polyethylene Telephthalate plastic can be used as a mixture of environmentally friendly waterproof plasterboard making. In further development, these composites not only can be used as plasterboard, but can be used as house doors, study tables, room walls, ironing boards, canopies, sound absorbers, etc.

Keywords
corn skin fiber, banana skin fiber, PET plastic, composite hybrid, epoxy resin

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/nBkQw6JxPXve

Corresponding Author
Noviana Suhartaya

Institutions
(1). Aeronautica Studies Program, Sekolah Tinggi Teknologi Kedirgantaraan, Jl. Parangtritis Km. 4,5 Yogyakarta Special Region, Indonesia.
*noviana.utami[at]sttkd.ac.id

(2). Chemical Engineering Departement, Faculty of Engineering, Universitas Gadjah Mada, Jl. Grafika No. 2 Bulaksumur, 55281, Yogyakarta Special Region, Indonesia.

Abstract
Indonesia as one of the archipelagic countries with 16,055 islands and has been registered with the United Nations through the United Nations Conference on The Standardization of Geographical Names (UNCSGN) and United Nations Groups of Experts on Geographical Names (UNGEGN) certainly requires transportation facilities that can reach all areas of the country. The most efficient and effective mode of transportation to reach all the islands in Indonesia is aircraft. Along with the increasing number of users it will increase the number of requests in the level of comfort and safety of passengers, one of which is in the feasibility of an aircraft. The fuselage as one of the components of an open airplane will easily corrode. Where corrosion in the fuselage is a significant problem for commercial and military aircraft. This study aim to study the corrosion rate of aircraft metal components in the fuselage against pH variations. pH variations in this study were 3.4; 3.8; 4.4; 4.8; 5.4; 5.8; 6.1; 7.5; and 12 at fixed temperature of 30℃. This research method uses the weight loss method of aircraft metal components that are measured once every 1hour. The results of this study conclude that the corrosion rate of MD 80 type metal component in the fuselage section at a fixed temperature of 30℃ in a span of 12 hours showed less significant results. This might be due to the corrosion rate of metal components of airplanes running very slowly, so that in the span of 12 hours still not showing significant results.

Keywords
Corrosion Rate of Aircraft Component, Fuselage, pH

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/4hEbVPkK6eLy