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All Journal Journal of Sustainability Perspectives Prosiding SNTTM
Gandjar Kiswanto
Universitas Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Education Engineering Environmental Science Industrial & Manufacturing Engineering

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Transportation Management in Universitas Indonesia Gandjar Kiswanto; Denni Hanzen; Faradilla Safitri; Farizha Febrianty
Journal of Sustainability Perspectives Vol 1, No 3 (2021)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (414.989 KB) | DOI: 10.14710/jsp.2021.12567

Abstract

Transportation management is one of the supports for a green and healthy campus. The increasing number of campus population has an impact on the number of vehicles entering the campus environment. So that in order to reduce the number of incoming vehicles, transportation management in the Universitas Indonesia is needed. In addition to regulating the transportation system on campus, transportation management also regulates the prohibition of the UI Civitas Academica from bringing private vehicles into the campus environment. To limit the vehicles that enter the campus environment, UI takes strategic steps such as making policies, building support facilities and planning that have been prepared and will be explained in this paper. to reduce and limit vehicles in the campus environment One of the steps taken by the Universitas Indonesia is to provide Zero Emissions Vehicle (ZEV) transportation such as buses, bicylce, and scooters as a means of transportation that can be used for free by the UI Civitas Academica. To reduce and restrict private vehicles, UI is building a Highway Distribution to facilitate pedestrians, building a BORR (Bikers Outer Ring Road) lane for motorbikes, implementing a gate parking system at every entrance to the UI campus, In addition, UI also enforces various policies such as reducing the parking area, and prohibiting semester 1 and 2 students from bringing private vehicles into the campus environment, this is done by UI to reduce vehicles entering the UI campus
Thermal performance enhancement in electric motor rotors: Evaluating the impact of rotating heat pipes Khairu Rezqi; Nandy Putra; Sholahudin Sholahudin; Gandjar Kiswanto
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/hdn06j82

Abstract

Effective thermal management is essential in high-performance electric motors, where rotor overheating accelerates demagnetization and reduces operational lifespan. This study investigates a horizontally mounted, wick based rotating heat pipe (RHP) as a passive cooling solution for an induction motor rotor. The system was subjected to stepped heat loads 20, 25, 30, and 35 W, also and speeds 0, 250, 500, 750 RPM, with time resolved measurements acquired to evaluate steady state thermal resistance (Rth) and transient response. The results reveal a non monotonic relationship between rotational speed and thermal performance. Contrary to initial assumptions, the RHP achieved its lowest Rth of 0.164 °C/W not at standstill, but at a moderate speed of 250 RPM. This performance peak is attributed to a balanced interplay where gentle centrifugal force enhances capillary-driven liquid distribution, maximizing effective evaporation without inducing flow instability. Compared to the solid rotor baseline, the RHP consistently reduced rotor temperatures by up to 6 °C and lowered thermal resistance by more than 70%. Additionally, the RHP halved the thermal time constant following each power step, indicating superior transient regulation. The identification of an optimal rotational speed window, distinct from any transitional instability zone, offers critical design insight for embedding RHPs in next-generation electric machines where spatial constraints and thermal reliability are paramount.
Tool geometry influence on the tensile load of copper–AA1100 joint using two stage refilled friction stir spot welding (TS-RFSSW) Hikaru Trinita Salsabila; Ario Sunar Baskoro; Shafira Herdiyan Maritza Salsabila; Gandjar Kiswanto; Syarif Junaidi
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/hw8ka649

Abstract

Two stage refilled friction stir spot welding (TS-RFSSW) is a method to eliminate keyholes formed in the friction stir spot welding (FSSW). This study aims to investigate the effect of tool geometry on the tensile shear loads of joints produced by TS-RFSSW. Copper and aluminum AA110 sheets with a thickness of 0.42 mm were joined using the TS-RFSSW process. The tools used in the first stage have taper and triangular pins. In the second stage, pinless tools with 5 mm and 6 mm diameters were used to close the keyhole. Other process parameters used included a dwell time of 4 seconds, a plunge depth of 600 µm, and a tool tilt angle of 0⁰. The TS-RFSSW process successfully produced improved joint surfaces with minimal keyholes, resulting in increased tensile shear loads. The tool with a triangular pin produced joints with higher tensile shear loads due to more intensive material flow. On the other hand, increasing the diameter of the pinless tool for the second stage reduced the tensile shear loads of the joints. The maximum tensile shear load achieved was 292.78 ± 34.72 N using a triangular pin tool for the first stage and a 5 mm pinless tool for the second stage. 
Effect of travel speed ​​and arc length on geometry and heat accumulation in WAAM-GMAW process Agus Sifa; Ario Sunar Baskoro; Afrizal Riyantono; Faza Khoirina; Gandjar Kiswanto; Syarif Junaidi
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/88detg63

Abstract

Wire arc Additive Manufacturing (WAAM) is a technology capable of manufacturing large and complex components using aluminum alloys. This is due to its high deposition rate and efficient material utilization. However, WAAM faces several issues, particularly regarding process stability. In the WAAM process, especially when using Gas Metal Arc Welding (GMAW), stability is largely determined by controllable process parameters such as travel speed and arc length. This study aims to clarify how fusion stability, influenced by travel speed and arc length, affects the resulting deposit geometry and heat accumulation. The experimental method involved conducting a single-layer WAAM process using GMAW, with ER5356 filler (diameter 1 mm) and AA6061 substrate. During the single-layer WAAM GMAW process, the heat temperature and current were measured in real-time on the deposits. The results included minimum and maximum height and width measurements of the deposits produced. It was observed that increasing the travel speed reduced the current, thereby lowering the heat input. Heat accumulation, under fixed parameters of 80 A current, 16 V voltage, and varying travel speeds and arc lengths, fluctuated throughout the process. At an arc length of 6 mm, the single-layer deposit geometry exhibited humping, causing irregular widths and heights. Overall, both travel speed and arc length played significant roles in determining the maximum and minimum heights of the deposits.
Co-Authors Afrizal Riyantono Agus Sifa Ario Sunar Baskoro Denni Hanzen Faradilla Safitri Farizha Febrianty Faza Khoirina Hikaru Trinita Salsabila Khairu Rezqi Nandy Putra Shafira Herdiyan Maritza Salsabila Sholahudin Sholahudin Syarif Junaidi