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Agus Purwadi
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National Center for Sustainable Transportation Technology Gd. CRCS lt. 2, Institut Teknologi Bandung, Jl. Ganesha No.10, Lb. Siliwangi, Kecamatan Coblong, Kota Bandung, Jawa Barat 40132
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Kota bandung,
Jawa barat
INDONESIA
International Journal of Sustainable Transportation Technology
Published by Institut Teknologi Bandung
ISSN : 26557975     EISSN : 26204754     DOI : 10.31427/IJSTT
Core Subject : Engineering,
Automotive Engineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Transportation
Aim IJSTT is an innovative open access journal for high-quality research in transportation and infrastructure system by focusing particularly on interdisciplinary and multidisciplinary research. IJSTT welcomes submissions from all disciplines, including physics, chemistry, engineering and related fields. The journal represents a community-oriented approach to communicating science driven by the needs of scientists and aims to facilitate the flow of knowledge between and beyond these communities. Scope This journal seeks articles related to the transportation and infrastructure technology. Its scope will include the following topics (but not limited to): 1. Transportation and infrastructure system 2. Electrical and combustion vehicle system 3. Transportation and infrastructure safety 4. Socio-economic and environmental impact of transportation policy 5. Manufacturing and supply chain process in automotive industries 6. Computational materials science and modelling 7. Design and construction for transportation system and such other topics as the Editors may deem appropriate. Articles need to make a significant contribution to the theoretical and or methodological literature on the subject and contain a strong knowledge component. IJSTT welcomes submissions of the following article types: Short communication paper (Letters), Technical Paper, Original Research Paper and Topical Reviews.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 45 Documents
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The Correlation between Toll Road Development and the Improvement of Local Economy (Case Study: The Soroja Toll Road) Rahayu, Lisna; Kipuw, Desiree
http://dx.doi.org/10.31427/IJSTT.2020.3.1.5
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Abstract

Most studies assume that road development will improve the economy in the region, as reflected by an increase in Gross Domestic Product (GDP). However, GDP is macro in nature and tends to be biased if we ask who benefits from its increase. To identify whether road development has a positive correlation with the improvement of local economy, hence this study was conducted in a micro context by taking the development of the Soroja Toll Road in Indonesia as a case study. With a length of 10.57 km, connecting Bandung Regency and Bandung City, the newly constructed Soroja Toll Road has a strategic function in supporting activities in the Bandung Metropolitan Area (BMA) and is predicted giving implication on increasing Small and Medium Enterprises (SMEs) profit surrounding its corridor. However, a toll road cannot entirely be seen as a public goods, because not all people have access to this type of infrastructure. Only the users of four-wheeled vehicles and those who can afford to pay the toll charge can access the toll road. This study was aimed at identifying the correlation between the developments of the Soroja Toll Road with the improvement of local economy (SMEs) in its surrounding areas. Based on the analysis result, this study indicates that the presence of the Soroja Toll Road had a bigger positive correlation with the increased profit of medium-sized industries than small-sized industries due to their ability to capture a broader market.
Influence of Braking Strategies for Electric Trike Energy Consumption Islameka, Metha; Kusuma, Christopher; Budiman, Bentang
http://dx.doi.org/10.31427/IJSTT.2020.3.1.4
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Abstract

This research aims to investigate the effect of applying braking strategies to the energy consumption of electric trike (e-trike). E-trike is a three-wheeled vehicle that is designed for goods delivery. A simulation is carried out to find the specific electric energy consumption in terms of km/kWh. The simulation is conducted by developing an energy consumption model using Matlab/Simulink software. The input data used in the simulation is obtained from the e-trike specification designed by Institut Teknologi Bandung (ITB) researchers. The output is the battery State of Charge (SOC) and energy required for the Worldwide Harmonized Light Vehicle Test Procedure (WLTP) driving cycle. Four different braking strategies are implemented in the simulation, namely full mechanical braking, serial regenerative braking, parallel regenerative braking, and modified braking strategies. The simulation results show that by applying the modified braking strategy, greater savings of energy can be achieved. Full mechanical braking strategy can achieve energy savings of 19.2 km/kWh whereas the modified braking strategy generates 20 km/kWh. These results indicate that the application of modified braking strategies can significantly increase the e-trike mileage.
Design and Simulation of Two-Wheeled Balancing Mobile Robot with PID Controller Mudeng, Vicky; Hassanah, Barokatun; Priyanto, Yun; Saputra, Okcy
http://dx.doi.org/10.31427/IJSTT.2020.3.1.3
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Abstract

Mobile transportation robots using two wheels have now been investigated. The work within this study is to design and simulate two-wheeled robots, thus it can maintain its balance. Many control methods are used to determine satisfactory control optimization, therefore a proper response is obtained by sensor recitation corresponding with the reaction of a Direct Current (DC) motor. Recently, two-wheeled transportation robot is a Segway model. In this study, we apply a Proportional Integral Derivative (PID) controller as a control system in a self-balancing robot with a working principle is similar to an inverted pendulum. In the next study, the PID controller and the whole system are applied in the microcontroller board. The angular velocity of two DC motors used as a plant can be adjusted by Pulse Width Modulation (PWM) through a motor driver. An Inertial Measurement Unit (IMU) sensor is utilized to detect the angular acceleration and angular velocity of the self-balancing robot. The phase design is constructed by planning the robot dimension, mechanical system, and an electronic system. Particularly, this study performs mathematical modeling of the robot system to obtain the transfer function. In addition, we simulate the PID parameter with multiplication between the basic parameter and several fixed constants. The simulation results indicate that the robot can maintain its balance and remains perpendicularly stable for balancing itself.
A Review of Range Extender Technologies in Electric Vehicles Evelyn, Evelyn; Aziz, Abd. Rashid; Sambegoro, Poetro
http://dx.doi.org/10.31427/IJSTT.2020.3.1.2
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Abstract

With the increasing global concern on negative environmental effect from the transportation sector, conventional automobile technologies will not be viable for much longer. Countries like the EU and China have introduced emission related regulations which are stricter than ever. This has compelled automotive manufacturer to turn to Electric Vehicles (EV) as the most effective solution to this issue. There are mainly two types of EV, namely Battery Electric Vehicle (BEV) and Hybrid Electric Vehicle (HEV). Both has its own strength and shortcomings, BEV with zero emission but limited range while HEV has better range at the expense of higher emission. Extended Range Electric Vehicle (EREV) provides a midpoint between these options. This option provides the best of both worlds by allowing users to switch between both systems depending on the vehicle’s operating condition. This paper aims to presents a variety of Range Extender (RE) configurations based on its working principle and type of fuel used. Internal combustion engine, fuel cell, and microturbine are what RE is commonly powered by. The advantages and disadvantages are evaluated and compared to determine the optimal option. It was concluded that depending on fuel availability, space, and efficiency requirement, each configuration has its own merit.
Improving the Accessibility of the West Java Southern Area through Collector Road Widening Maulana, Andrean; Farda, Muhammad
http://dx.doi.org/10.31427/IJSTT.2020.3.1.1
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Abstract

This study assesses the impact of the road segment widening in the southern area of West Java Island. The resulting network performance is measured by volume capacity ratio, network average speed, aggregate travel distance and time. The network 4-step modeling approach was used for the analysis and data on traffic counts and average speed are used to validate the model. The study proceeds two scenarios for the analysis, namely the do-nothing scenario, in which no road widening occurs, and the do-something scenario where the road widening is carried out. The result shows that widening the road segments will contribute to improving accessibility in the area, which is reflected by lower volume capacity ratio and higher average network speed. This study also triggers a research question on alternative transport modes to improve accessibility in the southern area of West Java.
The Effects of Grain Size, Oxidizers and Catalysts on Band Gap Energy of Gelam-Wood Carbon Syarif, Nirwan; Rohendi, Dedi; Haryati, Sri; Dewi, Claudia
http://dx.doi.org/10.31427/IJSTT.2019.2.2.5
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Abstract

The research of the effects of grain size, oxidizers, and catalysts on band gap energy of gelam-wood carbon has been conducted in which the carbons were produced from gelam-wood pyrolysis in high temperatures. The instrumentations used in this study were UV-Vis, FTIR spectrophotometer, and SEM. SEM and FTIR were used to characterize the morphology and the functionality of the carbon surface. UV-Vis spectrograms showed that the electronic property of carbon such as band gap was affected when grain size and surface area were changed. The increase of the functional groups in carbon occurred as the surface area of the carbon was increased. Band gap energy of crystalline carbon became much lower along with the increase in grain size due to the effects of bands-broadening. FTIR spectrograms showed that the carbon contained of hydroxyl and carboxylic groups. The hydroxyls were derived from steam-oxidized carbon that was provided narrower in the interlayer distance and lower-set band gap energy. Carboxylic groups were derived from acid nitric oxidation causing flat layer to become curved. The layers were wider and the band energy was higher. The main factor that affects the electronic structure of metal oxide in carbon/metal oxide composites was atomic alignments. The band gap energy increased along with the increase of the asymmetry alignments in metal oxide.
Electrochemical Evaluation of Lithium-Ion Battery with Anode of Layer-Reduced Biocarbon and Cathode of LiFePO4 Syarif, Nirwan; Rohendi, Dedi; Sya'baniah, Nyimas
http://dx.doi.org/10.31427/IJSTT.2019.2.2.4
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Abstract

The application of reduced carbon anode layer and LiFePO4 cathode was conducted in laboratory-scale battery. Both electrodes were fabricated into lithium - ion battery with LiCl electrolyte in both gel and liquid based. The carbon was prepared by using Hummer method and solvent sonification to exfoliate the carbon layer from biocarbon. The battery performance tests were carried out in potentiostat for Cyclic Voltammetry (CV) and galvanostatic measurements. The highest current of CV measurement can be obtained in the battery with reduced carbon layer anode and 20% of liquid electrolyte. It was calculated that the same battery produced the highest energy and power. Current - Voltage profile is relatively stable in CV of batteries with 40% electrolytes in both gel and liquid media. All batteries have two peaks in both anodic and cathodic. The reduction peaks show in around 0.5 and 1.5 volts. The cathodics show in around –0.5 and –1.5 volts. The best power and energy values are given by battery with rCNSO anode and 20% liquid electrolyte. Galvanostatic profiles show that the 40% electrolytes in the batteries produces a slower discharging process. It was revealed that applying anode of layer reduced biocarbon as the battery electrode caused the discharging to run faster. The highest slope value of the galvanostatic curve can be found in the battery with the electrode of oxidized starting material and 40% of gel electrolyte, while the lowest can be found in 20% gel electrolyte with the same electrode.
Battery Cells for Electric Vehicles Halimah, Putri; Rahardian, Samuel; Budiman, Bentang
http://dx.doi.org/10.31427/IJSTT.2019.2.2.3
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Abstract

The shifting trend of conventional to the electric drivetrain in automotive industries makes batteries become the most favorable energy storage. There are three types of battery cells that are commonly used for electric vehicles i.e., cylindrical cells, pouch cells, and prismatic cells. The use of active material such as lithium-ion in the battery of electric vehicles could bring some issues related to the safety field. For that reason, comprehensive research on battery failure analysis needs to be conducted. This paper reviews the recent progress of the use of battery cells in electric vehicles and some challenges which must be considered to assure their safety. There are a lot of studies on battery failure analysis, which mainly focuses on the appearance of a short circuit as the main cause of the thermal runaway event. Several proposals on predicting short circuits in the battery due to various loading are comprehensively discussed. Those research results can be considered to establish regulations in designing battery protectors.
An Innovative Design of Magnetorheological Lateral Damper for Secondary Suspension of a Train Masa'id, Aji; Ubaidillah, Ubaidillah; Lenggana, Bhre; Muhayat, Nurul; Wibowo, Wibowo; Mazlan, Saiful
http://dx.doi.org/10.31427/IJSTT.2019.2.2.2
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Abstract

This article delivered an innovative idea of a magnetorheological (MR) damper for secondary suspension of train bogie. The valve inside MR damper adopted meandering of both fluid flow and magnetic flux for improving magnetization area. In this work, the design and working principle of the MR valve were presented including a mathematical model to predict the pressure drop. In the early stage, the finite element method magnetics software (FEMM) simulation could predict the magnetic flux density across the passages. Based on the amount of magnetic flux, the corresponding shear yield stress could be determined from its basic physical properties. The mathematical model covered pressure drop prediction for both off-state and on-state. The FEMM simulation results showed that the meandering flow and serpentine flux design could improve the effective area of magnetization. Consequently, the pressure drop of the valve could have wider ranges and achieve a high value of pressure differences. This result could be potentially improving the performance of the damping forces of the lateral damper in a bogie train.
Analysis of Feeder Needs to Support the Implementation of LRT in Palembang Arliansyah, Joni
http://dx.doi.org/10.31427/IJSTT.2019.2.2.1
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Abstract

Palembang City in August 2018 was the first city in Indonesia which operated a mass transit of Light Rail Transit (LRT). LRT in Palembang City has a length of 23 km and 13 stations that stretch from the Airport station to the DJKA station. In its first year of operation, it was noted that the number of passengers using LRT was still very small, some efforts were needed to increase the number of LRT passengers. This study aimed to increase the number of LRT passengers by analyzing the development of the feeder line, the potential for increasing the number of passengers, and the infrastructure needs to support LRT operations in Palembang. The results show that four stations have the potential to develop feeder lanes, namely Asrama Haji station, RSUD station, Garuda Dempo station, and Polresta station, with the increased total number of potential passengers of 1460 passengers/day. The supporting infrastructure needed to support movement using LRT consists of a park and ride facilities, pedestrian bridges, the construction and repair of pedestrian facilities, and drop-off and pick-up facilities.

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