I Wayan Adiyasa
@uny.ac.id
Automotive Engineering Education Department
Universitas Negeri Yogyakarta
RESEARCH INTERESTS
Automotive Electrical, Power Electronics, Renewable Energy
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Agus P. Prasetyono, Yosep Efendi, Angga Damayanto, I. W. Adiyasa, and Baasitha Nurindah Cahyaning
AIP Publishing
Aan Yudianto, Moch Solikin, Sutiman Sutiman, Zainal Arifin, IWayan Adiyasa, and Afri Yudantoko
Universidad de Antioquia
A vehicle is more stable when the geometric center, center of gravity, and stagnation point are in line. However, the inflow direction and velocity magnitude of the operational environment of road vehicles are varying. This study aims to investigate the aerodynamic behavior of a water-drop-shaped vehicle under side wind conditions. Some essential aerodynamic performances of the vehicle are numerically and graphically analyzed at 0 deg, 10 deg, and 20 deg of side wind directions. The value of the coefficient of drag, drag force, coefficient of lift, and lift force exponentially increases as the yaw angle elevates. The lower part on the area of the front-wheel compartment becomes the critical location indicated by the results on pressure coefficient, friction coefficient, and total wall shear stress distribution along the vehicle surface. Increasing the side wind angle triggers more significant vortex regions generated around the wheel compartment and on the leeward side of the vehicle.
Z. Arifin, I W Adiyasa, and M A Hizami Rasid
IOP Publishing
Abstract Optimal design results in maximum motor performance. This type of BLDC motor has undergone design innovations such as surface-mounted permanent magnet (SPM) with variants such as: radial magnet, rectangular magnet, and bread-loaf. The position of the outer rotor is a motor design that is commonly applied to electric bicycles. The position of the magnet attached to the side of the electric motor body allows for superior torque performance. In this paper, we present an analysis of the BLDC motor on an electric bicycle that has been implemented. The motor used uses the outer rotor SPM geometry with a power of 500W. Parameter changes made are slot depth, tooth width, and comparing the basic design with the Halbach array design using 2 and 3 magnets. Changes in these parameters have an impact on power, torque, speed, and efficiency.
I W Adiyasa, F D Wijaya, and R P Suteja
IOP Publishing
Abstract The implementation of renewable energy sources such as photovoltaic (PV) and wind turbine (WT) is widely applied. Indonesia is a country located in the tropics, with the potential for renewable energy sources such as solar and wind. The number of potential sources of renewable energy has an impact on the amount of energy that can be produced using PV and WT. Data on potential renewable energy sources is obtained from the NASA Prediction of Worldwide Energy Resource (POWER) database and is used for analysis of electrical energy that can be produced. The PV and WT power plants used in this analysis use a power range of 600 - 1200 Wp for PV and 1 - 3 kW for WT. The electrical energy that has been produced will be stored in energy storage in the form of a battery with a capacity of 1 kWh. The test analysis uses 6 scenarios of the number of PV, WT and batteries using a house load and charging an electric motorcycle.
A. Yudianto, I. W. Adiyasa and A. Yudantoko
A Yudianto, H A Susanto, A Suyanto, I W Adiyasa, A Yudantoko, and N A Fauzi
IOP Publishing
Abstract An open-wheel vehicle with manual hybrid engine control with formula-like body shape was developed for a learning media at a vocational high school. This study aims to analyze the airflow of over the vehicle body as the effect of wing installation under various vehicle speeds. The investigations are to observe and evaluate the drag coefficient, drag force, lift coefficient, downforce, pressure distribution, streamlines, and velocity vector condition by emphasizing on the results from Computational Fluid Dynamics (CFD) simulation. The study found that installing the front and rear wings contribute to the decrement of drag coefficient 0.07 points and keeping the drag force relatively constant since the projection area changed. The benefit of having wings installed significantly increases the downforce by 334 N, which is 5.51 times higher than without wings in the speed of 150 km/h. However, the engine cover gives a significant obstacle to airflow, reducing the functionality of the rear wing. As such, the presence of the rear wing does not have a substantial effect on reducing the wake region.
I W Adiyasa, A P Prasetyono, A Yudianto, P P W Begawan, and D Sultantyo
IOP Publishing
Abstract Measuring the temperature of the combustion engine is very much needed. Both from the use of tuning, research, and learning. The problem with the syringe when measuring the temperature of the combustion engine is that the measuring device must be attached to the combustion engine body and there is a time delay for measuring the temperature. In this paper the focus is on the interpolation method for an 8x8 pixel thermal camera. The image data will be created in a graphical user interface (GUI) so that the image looks very clear. Images that have a resolution of 16x16 and 32x32 resolutions. The Sehigga object on the thermal camera reading looks clearer and more detailed. In the GUI, it allows data to use both ordinary images and videos. There are 3 sample images that have been interpolated. The results of the research on paper show the conditions of the interpolated results from images 8x8 to 16x16 and 32x32. The time it takes to display the image is 0.5 seconds.
A Yudianto, A P Prasetyono, I W Adiyasa, K B Purnomo, and N A Fauzi
IOP Publishing
Abstract Modification of a motorcycle helmet has been performed by inserting an electronic device in the helmet’s inner liner. Therefore, a hole requires to be made to place the device. This study aims to analyze the impact loading performance of a motorcycle helmet due to an impact from the top, rear, and side. The investigation of stress distribution and acceleration experienced by the helmet is analyzed by utilizing finite element method simulation. The results indicate that the hole position is not in the impact area. The outer shell experiences higher stress than the inner liner in all testing conditions. The rear impact causes the highest value of the outer shell stress, where for the inner liner, the side impact contributes to the maximum value of the stress. Headform linear acceleration reaches the peak than is higher than the basic requirements of the helmet testing standard.
A Yudianto, S Ghaffari, P Huet, I W Adiyasa, and J N Rohman
IOP Publishing
Abstract The stiffness of the car body becomes important due to the fact that it must keep the passenger’s compartment undeformed even during severe operating conditions. Car body T-joint is one of the main parts of car’s body to properly support its function. Three different cases were applied to evaluate the influence of difference spot weld configuration to bending and torsional stiffness of car body T-joint. The stresses and the displacements were also deeply investigated. The maximum stress in longitudinal direction and due to moment reaches its peak on 55x15 spot weld configuration. The displacement increases as the spot weld distance widen. Both bending and torsional stiffness decrease as the spot weld distance becomes larger.
Sutiman, I W Adiyasa, F A Prapsita, and H Yudistira
IOP Publishing
Abstract This study aims to optimize fuel consumption in the Garuda UNY Urban Gasoline-19 vehicle by changing the injection time mapping. Injection Timing Mapping using Programmable ECU software MegaSquirt III and Tuner Studio 3. Based on standard ECU data, Mapping Timing Injection Case 1 (IT-C1) and Timing Injection Case 2 (IT-C2) were generated. Performance tests are carried out using static tests in the laboratory and dynamic tests in the field. The application of IT-C2 resulted in the best reduction in fuel consumption, namely 12% in the static test and 11.08% in the dynamic test. The delay in initiation of injection results in less responsive acceleration.
Sutiman, I W Adiyasa, A Prayoga, A G Irfak, and R S Ardiyan
IOP Publishing
Abstract The use of an electronic system to regulate the injection system is a solution that can improve the performance and fuel efficiency of an engine. However, conventional vehicles require retrofit to be able to use the electronic fuel injection (EFI) system. The design uses a microcontroller system with ARM32 architecture. The inputs used to determine the duration and timing of the injection are a crankshaft position sensor (CKP), throttle position sensor (TPS), manifold absolute pressure (MAP), air temperature sensor (ATS), and lambda sensor. Before the sensor signal enters the microcontroller, the signal is filtered using a low pass filter (LPF) with a cut-off point of 50Hz. The actuator system consists of an injector. While the ignition system can use a capacitor discharge ignition (CDI). The novelty in this design is that the type of sensor can be replaced with a resistant type sensor. So that there will be many variants of the fuel injection system tuning retrofit that can be done with conventional motors.
I W Adiyasa, M Solikin, H Khalid, A Umar, and I N Riyan
IOP Publishing
Abstract The use of instruments for vehicle repair is very important to use. However, the instrument is very expensive and many features are not used. So that in this study designed a simple measuring instrument that is able to measure the size of the sensor. The tool uses a 32bit based microcontroller integrated with bluetooth. There are 4 voltage gauge channels. The reading data is communicated to the graphic user interface (GUI) on the laptop device. The measuring instrument can record the measured sensor on a vehicle for 1 minute for analysis.
A P Prasetyono, I W Adiyasa, A Yudianto, and S N K Agit
IOP Publishing
Abstract Distance sensing on vehicles is a trend in the development of autonomous cars. So that the use of proximity sensors such as ultrasonic and infrared, is very important. This research paper focuses on developing a reading of 4 ultrasonic sensors simultaneously. Where the reading method is done using 4 pin echo and 4 pins trigger and 1 pin echo with 4 pin triggers. In order for better reading, the programming algorithm for each method is integrated with the moving average filter. The use of this filter is able to correct the noise that occurs when reading the distance. The test was carried out at the computer simulation stage using a microcontroller. The final results of the study obtained a very small reading error.
Sutiman, A Yudantoko, A Yudianto, M Solikin, I W Adiyasa, N M Suaib, F Sholichin, and D A Irawati
IOP Publishing
Abstract Needs analysis is the first and necessary step for the researchers to design a newly developed learning media to find out a set of specific requirements to conduct the research activities. The study aims (1) to investigate the user’s learning preference, (2) to select the suitable learning materials and to choose the appropriate type of engines, and (3) to identify the needs for the virtual reality development. A focus group discussion (FGD) comprising some representative users and experts in learning media has been involved in the activities with the use of the FGD guidance sheet as the supplementary tools. Additionally, the literature study has also been conducted to collect the necessary additional data to perform a 3D design of the engine. The data were analyzed qualitatively by examining the comment from the users, the experts, and the outcome of the literature review study. It was then concluded that (1) the users require the learning process, which does not need to alternate the learning objects. (2) The two-stroke single-cylinder engine was decided to choose by considering the complexity of the engine mechanical construction. Finally, (3) the needs for engine assembly drawing and virtual reality development have also been described.
F Sholichin, N M Suaib, D A Irawati, Sutiman, M Solikin, A Yudantoko, A Yudianto, I W Adiyasa, A J Sihes, and H A Sulaiman
IOP Publishing
Abstract Virtual reality technology has been adopted as a modern learning media in vocational education. Nowadays, the practical learning needs complete equipment and tools to achieve the goal study. However, the conventional media requirement is a challenge for academician for learning process, specifically in automotive and machine areas. Virtual reality provides a solution for this problem, but still needs proper analysis on the impact of usability between conventional and VR media to which each learning objective is achieved. The case study used in this research is a two-stroke engine, which is currently a rare item in the real world. We replicated this two-stroke engine in the developed VR system using Unity game engine and Oculus quest. A comparison on the usability effectiveness on conventional and virtual reality methods was conducted using cognitive walkthrough, which follows the four steps of learning objective training. The result shows that three out of four learning objectives are similar with conventional objective training. One of the process on preparation for disassembly machine has slight difference with conventional training; faulty engine due from environment elements (liquid, rusty iron) was not included.
Dyah Ayu Yuli Murniyati, Lesnanto Multa Putranto, F. Danang Wijaya, Nurman Setiawan, and I Wayan Adiyasa
IEEE
The location of the plant depends on the potential of renewable energy sources. This microgrid power source is a renewable energy generator that will be optimized. The mobile power plant in which implemented is a synchronous generator coupled with a diesel engine, and two power plants based on an induction generator which is implemented as a wind power plant and a micro hydropower plant. Generator will be operated in stand-alone and parallel in the system when the load increases, the load decreases. The increase in load and decrease in the burden can be influenced in terms of the location of these renewable energy plants and can cause a decrease in voltage and frequency. To support the benefits of the scattered power plant, good planning is needed, including determining the location of placement and the power of the scattered power plant that is used so that by optimizing the location of the power plant system in order to achieve optimal operating patterns, when the system voltage stability can reach the voltage parameter 380 V (+ 5% and -10%) and 50 Hz (± 1%) frequency when the generator is working in parallel with variations in loading. Voltage reduction can be minimized by choosing the cable type and generator distance.
I Wayan Adiyasa, Aan Yudianto, Ninda Kurniadi, and Sutiman
IOP Publishing
Abstract Student formula competition requires modification of the intake manifold hole by 20 mm. The internal combustion engine used has a capacity of 600 cc and an intake hole of 45 mm. The intake hole reduction affects the performance of the internal combustion engine. The ratio of the amount of air that is too small causes a decrease in engine performance. Ignition remapping is needed and fuel injection on the internal combustion engine. In the remapping process, the ratio of air and fuel is adjusted to the needs. The standard ECU on an internal combustion engine cannot be remapped. So the standard ECU on internal combustion engines is replaced using Motec M400. The parameters on the engine are only added to the camshaft sensor to determine the ignition timing and injection. Other sensors such as throttle position sensor, manifold absolute pressure, intake air temperature sensor, and engine temperature are used to determine ignition mapping parameters, fuel injection, and compensation for cranking, idle, and acceleration requirements. Tests obtained ignition remapping and fuel injection on internal combustion engines using ECU.
A Yudianto, N Kurniadi, I Wayan Adiyasa, and Z Arifin
IOP Publishing
Abstract The proper design of the suspension damper determines the ride quality and road holding performance of the suspension system against the road excitation. The objective of the present study is to investigate the effect of both sprung and unsprung masses on the root-mean-square vertical acceleration experienced by the occupants to determine the optimal value of the damping coefficient. Road excitation, 2-DOF mathematical model, and ISO 2631 weighting function were numerically modelled into three different cases in Matlab platform. The responses in root-mean-square value of acceleration were then evaluated. Further, the results were compared and the analysis was performed to determine the optimal value of the damping coefficient for the proposed suspension model. The obtained results indicate that varying the sprung masses with the proportional value of unsprung masses does not affect the root-mean-square value, but it increases the value of optimum damping coefficient by 131.5 Ns/m. Making the sprung mass constant increases the root-mean-square value by 0.005 m/s2 for each chosen unsprung mass. However, fixing the unsprung mass influences both acceleration and the value of damping coefficient.
Azis Jamal Fizari, F. Danang Wijaya, Adha Imam Cahyadi, and I Wayan Adiyasa
IEEE
The development of renewable energy is the main goal to reduce the use of fossil energy. This will have an impact on reducing environmental pollution. Ocean current is one of the renewable energy resources that can develop optimally. That is because the potential of ocean currents is very large, especially in Indonesia. The characteristics of ocean currents have high current densities, so the power generated will be large. Turbines in a deep ocean current generator do not need land and it’s easy to predict. The challenges in developing an ocean deep current power plant are that it has a deficient current speed, and it must have low maintenance. The permanent magnet synchronous generator (PMSG) can be selected. The characteristics of PMSG have a high enough efficiency and can be operated at low speeds with several magnetic poles. In this paper, a proposed method to design a low-speed PSMG with 1.5kW of power is developed. The focus parameters are efficiency, power factor, cogging torque, and harmonic. While the parameters of the cooling system, mechanical pressure, etc. are ignored. PMSG design uses Ansys Maxwell software. The final result is obtained parameter design of PMSG power capacity of 1.5 kW with 20 poles, 30 slots. PMSG rotational speed reaches 300rpm with an efficiency of 89%, while cogging torque and harmonic distortions are 5.63e-12 Nm and 3.06%.
I Wayan Adiyasa, Eka Firmansyah, and Adha Imam Cahyadi
IEEE
Injection of LPG fuel in generator set engine using carburetor technology have not been controlled yet so that LPG fuel consumption become inefficient at dynamic condition such as variation of fuel quality and different load on the generator. The inefficient fuel combustion will produce the bad emissions of combustion waste. Thus, it needs to be controlled in order to reduce the emission on fuel control mechanisms. This research proposes a microcontroller based fuel control system using openloop and closed-loop control in the 1 kVA generator set. The open-loop control test is performed to obtain the characteristic of throttle angle and injection duration. After that, the result of open-loop control test is used as inputs for closed-loop control that use PI and PID control at different load scenarios. The system is tested in two scenarios, scenario 1 is the generator driving 335 Watt load and scenario 2 the generator is driving 555 Watt load. On the PI Control test with Kp at 4.14 and Ki at 1.67, the generator time response is 3.1 seconds at scenario 1 and 3.6 seconds at scenario 2. Then on the PID control test with Kp at 5.52, Ki at 1 and Kd at 0.25, time response at the generator is 2.6 seconds at scenario 1 and 2.7 seconds at scenario 2. The fuel pressure can be reduced to 2.45 psi at loading scenario 1 and reduced to 2.82 psi at loading scenario 2 compared when using a carburetor. That closed-loop control is applied to increase the efficiency of fuel consumption that is directly influenced the reducing of emission from combustion.
I Wayan Adiyasa, Eka Firmansyah, Adha Imam Cahyadi, and Anggito Kautsar
IEEE
Replacement of the generator set (genset) gasoline fuel using LPG fuel causes several problems. One of the problems is that the engine rotation speed is not stable. The problem is caused by the influence of the ratio of air and fuel mixture to the internal combustion engine. By using the electronic control unit (ECU), the ratio of air and fuel mixture can be adjusted to the needs of the engine so that the engine speed is maintained. Controlling the actuator based on sensing parameter with using ECU on engine. This paper focuses on a simple design of ECU to adjust the ratio of air and fuel mixture and frequency output in the genset. Control of servo motor and injector using ECU based microcontroller Cortex-M3. Setting the duration of injection using second degree polynomial function obtained based on regression analysis on injection mapping. Control of frequency output using PI and PID controls can maintain response time according to the characteristics when using gasoline. In 3 scenarios of dynamic conditions, the application of PI and PID controls gives a good effect in maintaining the output frequency in the generator.