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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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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 44 Documents
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Structural Optimizations of a 12/8 Switched Reluctance Motor using a Genetic Algorithm Sholahuddin, Umar; Purwadi, Agus; Haroen, Yanuarsyah
http://dx.doi.org/10.31427/IJSTT.2018.1.1.5
Publisher : Unijourn Publisher

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Abstract

Structural design optimization of 12/8 switched reluctance motor using single objectives genetic algorithms is explored. The objective of this optimization is to maximize the output torque using four parameters, namely rotor width of tooth root, rotor width of tooth tip, half of stator tooth width, and stator outer diameter. The result is the optimized motor has higher average torque of 25% compared to the initial design. The evaluation of motor model is finite element method. The 12/8 switched reluctance motor will be applied in a mini electric vehicle.
On the Lightweight Structural Design for Electric Road and Railway Vehicles using Fiber Reinforced Polymer Composites–A Review Arifurrahman, Faizal; Budiman, Bentang; Aziz, Muhammad
http://dx.doi.org/10.31427/IJSTT.2018.1.1.4
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Abstract

The main challenging issues of vehicles with electric propulsion are on the limited energy source due to relatively low battery capacity and low excitation of power traction. They can be tackled down by designing lightweight structures for frameworks and bodies of the vehicles. Composite materials which have a high strength to weight ratio are the best choice for designing and manufacturing the lightweight structures. A review of recent progress in utilization of the composite materials for electric vehicle structures is presented. It focuses on how the structures can support the electric vehicles to compete with internal combustion engine vehicles regarding their performance on the road. The utilization of composite material for structures of railway vehicles is also summarized. Furthermore, discussions are extended to the key technologies required for applying the composite materials in Indonesia such as composite–metal joint technology, fiber and matrix production technology, and numerical analysis competency for modeling the composite.
Mapping of Inbound Flows in Supply Chain of Lithium-ion Industry in Indonesia Sutopo, Wahyudi; Zakaria, Roni; Wardayanti, Ari; Fahma, Fakhrina
http://dx.doi.org/10.31427/IJSTT.2018.1.1.3
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Abstract

The demand for lithium battery is currently high from the consumer side due to the widespread application of lithium-ion battery for electronics (laptops, notebooks, mobile phones, street lighting) and electric vehicles (electric cars and electric motors). In Indonesia, the research and industrialization on lithium-ion battery have been conducted to develop products such as for electric vehicles and street lighting. On the other hand, the relationship between suppliers, producers, distribution channels, and consumers has not been mapped. This mapping is intended to provide an overview of the strength of suppliers, involved manufacturers, and to determine the readiness of the value chain of lithium-ion battery to perform mass production. The approach in the mapping uses primary data and secondary data for the initial stage of inbound flows in supply chain of lithium-ion industry in Indonesia. Primary data are obtained from the questionnaires, which adopted from the value chain lithium-ion battery research in USA adjusted for Indonesian context. Meanwhile, the secondary data derived from literature reviews. The respondents in the study are 11 institutions consisting of manufacturers and R&D of lithium-ion battery in Indonesia. The results obtained are supplier mapping that provides the flow of lithium-ion battery, cell, module, and pack as well as the producers and consumers. The results could also be utilized to identify the valuable metrics in the supply chain of lithium battery industry.
Optimization of Bus Body Frame Structure for Weight Minimizing with Constraint of Natural Frequency using Adaptive Single-Objective Method Haryanto, Ismoyo; Raharjo, Fuad; Kurdi, Ojo; Haryadi, Gunawan; Santosa, Sigit; Gunawan, Leonardo
http://dx.doi.org/10.31427/IJSTT.2018.1.1.2
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Abstract

The objective of this work is to analyze and optimize a bus frame structure using Finite Element Method in dynamic conditions. The bus body geometry was obtained directly from the three-dimensional Computer-Aided Design files. The optimization was conducted to determine the minimum weight of the bus frame structure without violating the specified natural frequency constraints. The design variable is the thickness of the bus body frame. In present study, Adaptive Single Objective method was chosen as an optimizer method. The results show that the structural weight of the bus frame can be reduced about 8% without changing its dynamic characteristic.
Supplier Selection Model of the Lithium-ion Battery using Fuzzy AHP and Analysis of BOCR Wardayanti, Ari; Zakaria, Roni; Sutopo, Wahyudi; Louhenapessy, Bendjamin
http://dx.doi.org/10.31427/IJSTT.2018.1.1.1
Publisher : Unijourn Publisher

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Abstract

Although the demand for the lithium-ion battery for electronic consumers and electric vehicles in Indonesia is high, there is no supplier coming from the local manufacturer. The proper selection of suppliers is required by some lithium-ion battery manufacturers (cells, modules, and packs), and Research and Development (R&D) center of the lithium-ion battery with the consideration not only in benefits and cost but also in opportunities and risks. It is important that experts assist the manufacturers and R&D to procure the lithium-ion (materials and cells), through transparent methods that seek a quantitative model to select the right supplier. The main objective of this study is to propose an analytical approach to select suppliers which incorporate Benefits, Opportunities, Costs and Risks (BOCR) concept that comply with the characteristics of the lithium-ion battery industries. A fuzzy Analytical Hierarchy Process (AHP) model is developed by accommodating the vagueness and inaccuracies of expert elections. The result of this research is development of the model obtained from 2 questionnaires given to the expert. Questionnaire 1 was made for the determination of criteria and sub-criteria, while Questionnaire 2 aims to perform pairwise comparisons of existing criteria and sub-criteria. In the selection of the lithium-ion battery suppliers, there are 11 criteria and 40 sub-criteria which are considered. Those criteria are divided into 4 merits and known for their respective global priorities.
Techno-Economic Analysis of the NiFe2O4 Nanoparticles for Vehicle Battery Application Using the Hydrothermal Synthesis Method Zen, Muhammad; Haq, Fatih; Gabriella, Rachel; Putri, Silmi; Nandiyanto, Asep; Kurniawan, Tedi
http://dx.doi.org/10.31427/IJSTT.2021.4.1.4
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Abstract

The purpose of this paper is to evaluate the economic and industrial scale of the production of NiFe2O4 for vehicle batteries using the hydrothermal synthesis method. The method used is to calculate gross profit margin (GPM), payback period (PBP), cumulative net present value (CNPV), total investment cost (TIC), and profitability index (PI). NiFe2O4 nanoparticles were synthesized with the main raw materials being NiCl2·6H2O, FeCl3·6H2O, and NaOH (1:2:8). Calculation results from GPM and CNPV/TIC from the NiFe2O4 industry using the hydrothermal synthesis method show the payback period (PBP) in the third year. So that in the third year onwards it can be predicted that the industry will experience profits. It is expected that NiFe2O4 can be applied on an industrial scale for Li-ion battery anodes.
Development of Conceptual Design for Electric Bus Body Structure Using Simple Structural Surface Method Haryanto, Ismoyo; Widodo, Achmad; Satya, Ibrahim; Haryadi, Gunawan; Kurdi, Ojo; Budiman, Bentang; Santosa, Sigit
http://dx.doi.org/10.31427/IJSTT.2021.4.1.3
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Abstract

An optimum design for a vehicle structure is always desired because the structure can significantly affect the vehicle's performance. However, some complex iterations are usually involved in the designing process. The objective of the present study is to implement the Simple Structural Surfaces (SSS) method for analyzing electric bus body structure that can reduce complexity in the stage of conceptual design. The SSS method model the vehicle structure as several planar sheets and determine the forces in each sheet. Implementing the SSS method at the early stage of the vehicle's development can minimize the number of parameter changes needed during the late stage of development. The results showed that compared with the results obtained from FEM, the SSS method gave the maximum stress value on the chassis in good accordance. Yet, the downside of using this method is that determining the deflections in the structure becomes a little bit complicated. Successfully implementing this strategy can reduce the time and cost required to develop an effective vehicle structure.
Study of Public Transport Development in South Bali Districts: Potential Public Transport Mode Putri, Adni; Farda, Muhammad; Santosa, Sigit; Dirgahayani, Puspita; Suthanaya, Putu; Andani, I Gusti; Sutanto, Hansen; Charky, Laily; Nurjanah, Nunuj
http://dx.doi.org/10.31427/IJSTT.2021.4.1.2
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Abstract

Bali Province in Indonesia is one of the most attractive tourist destinations in the world. The number of tourists visiting this province keeps increasing year by year parallel with the increase of the population of local citizens. Such a phenomenon will certainly increase travel demand and put pressure on the current transport infrastructure. Hence, transport infrastructure development is essential to support the travel demand. This study explores the possibility of implementing a new public transport system in the South Bali District, a district with numerous tourist attractions and activity centres. Data collection on the current transport system and land use in the district were carried out to understand potential corridors for public transport. A stated preference survey was also conducted to discover the public transport mode preferred by the respondents, encompassing tourists and local citizens. This study then recommends the type of public transport mode to be implemented in the district based on i) space availability, ii) respondent preference, and iii) ability to accommodate demand based on calculation. The study concludes that Automated Rapid Transit (ART) is a mode that has the highest potential to be implemented in South Bali Districts.
Rest Area Development in Central Java (Case Study: Rest Area on Semarang–Solo Toll Road) Darmawan, Edy; Sari, Suzanna; Werdiningsih, Hermin; Enis, Adhisti
http://dx.doi.org/10.31427/IJSTT.2021.4.1.1
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Abstract

The construction of the road network is carried out to support the growth and acceleration of the economic process and the development of the tourism industry. It is also projected to improve the socio-economic conditions of the community. In the last few years, the Central Java Government has built toll roads to connect several cities in Central Java in one fast lane. However, it was not followed by the construction of supporting facilities such as rest area that serves a place to rest for motorists when they experience fatigue during long trips. The existence of the place is still limited, and it was not evenly distributed along the toll road, causing long queues at the entrance of some rest area when the volume of the vehicles is overflow. Based on these problems, the purpose of this research is to study and develop the requirement of rest area that can meet the needs of motorists traveling through the toll roads in Central Java. To achieve these objectives, this research used a qualitative descriptive method to describe and explain the problems in the field, and further analyze them to get a comprehensive result. The result of this research is presented in the form of published research reports and scientific articles. It is expected to provide benefits to the relevant scientific field, especially those related to architecture in developing rest areas that suit the needs of road users.
Quasi-static Compressive Properties and Behavior of Single-cell Miura Origami Column Fabricated by 3D Printed PLA Material Triawan, Farid; Denatra, Geraldy; Djamari, Djati
http://dx.doi.org/10.31427/IJSTT.2020.3.2.5
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Abstract

The study of a thin-walled column structure has gained much attention due to its potential in many engineering applications, such as the crash box of a car. A thin-walled square column usually exhibits high initial peak force, which may become very dangerous to the driver or passenger. To address this issue, introducing some shape patterns, e.g., origami folding pattern, to the column may become a solution. The present work investigates the compressive properties and behavior of a square box column structure which adopts the Miura origami folding pattern. Several test pieces of single-cell Miura origami column with varying folding angle and layer height are fabricated by a 3D printer. The filament is made of Polylactic Acid (PLA), which is a brittle material. Then, compression tests are carried out to understand its compressive mechanical properties and behavior. The results show that introducing a Miura origami pattern to form a thin-walled square column can dramatically lower down the initial peak stress by 96.82% and, at the same time, increase its ductility, which eventually improves the energy absorption capacity by 61.68% despite the brittle fracture behavior.

Page 3 of 5 | Total Record : 44

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