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Journal of Mechanical and Manufacture
Published by Universitas Majalengka
ISSN : -     EISSN : 28294424     DOI : -
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Journal Of Mechanical And Manufacture (JMM) published 2 (two) times a year . Since 2022, the JMM published in March and September . Contents of the journal discusses the results of research in the field of manufacture engineering, industrial engineering and mechanical engineering
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 95 Documents
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Thermal Cycle Simulation of Welded Products with Heat Treatment Process on AISI 1015 Low Carbon Steel Aa Santosa; Tedi Heryanto; Iman Dirja; fahri rizki
Jurnal Mekanika dan Manufaktur Vol 5 No 2 (2026)
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In the welding of carbon steel, the cooling time from the highest temperature or peak temperature can be identified, where the cooling rate is generally represented in a welding thermal cycle. Knowledge of the welding thermal cycle greatly facilitates the understanding of the extent of differences in cooling rates at various applied peak temperatures. The thermal cycle curve can be obtained through direct testing methods, namely by measuring the temperature on the welded plate. However, this method requires extensive equipment and a high level of precision. Therefore, the author conducted an experiment to obtain the thermal cycle curve using an alternative method. This method involves heat treatment, in which the cooling process is carried out in free air (normalizing) while varying the peak temperature for each specimen. The specimens used in this study were AISI 1015 low-carbon steel, with dimensions of 100 × 20 × 20 mm for the larger specimens and 50 × 20 × 20 mm for the smaller specimens. The applied peak temperatures were 750°C, 800°C, 900°C, and 1000°C. The experimental results showed that the cooling rate obtained through the heat treatment process was inversely proportional to that of the welding process. Therefore, determining the thermal cycle using the heat treatment process is not recommended.
DESCRIPTIVE AND COMPARATIVE ANALYSIS OF THE EFFECT OF WEATHER/SEASONS ON PRODUCT SALES IN GROCERY STORES Whydiantoro; Nindi Lestari
Jurnal Mekanika dan Manufaktur Vol 5 No 2 (2026)
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/jmm.v5i2.17362

Abstract

Product sales in grocery stores are influenced by various factors, one of which is weather or seasonal conditions. Weather changes, such as the rainy season and the hot season, can influence consumer preferences when purchasing certain products. This study aims to analyze the effect of weather changes on sales patterns of two temperature-sensitive products: instant noodles and cold drinks. The method used was descriptive and comparative analysis based on eight weeks of weekly sales data, including heavy rain, light rain, and hot/scorching weather. The results showed that instant noodle sales increased significantly during the rainy season, with an average of 28.75 cartons per week, compared to only 13.5 cartons per week in the hot season. Conversely, cold drink sales increased sharply during the hot season, with an average of 28.25 cartons per week, compared to 11.5 cartons per week in the hot season. These findings confirm a direct relationship between weather conditions and consumer purchasing behavior and demonstrate the importance of adaptive inventory management strategies based on seasons so that grocery stores can minimize the risk of understocking or overstocking. This research also provides a basis for small business owners to make more informed and efficient procurement decisions.
SUPPLY CHAIN MANAGEMENT FOR GREEN HYDROGEN PRODUCTION AT PT. XYZ Intan Kusumadewi; Rivaldi Maulana Anwar
Jurnal Mekanika dan Manufaktur Vol 5 No 2 (2026)
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/jmm.v5i2.17353

Abstract

This study analyzed Supply Chain Management (SCM) for green hydrogen production at PT. XYZ. The development of green hydrogen requires an integrated and resilient supply chain covering upstream resource provision, production (electrolysis), purification and storage, and downstream distribution to end users. A qualitative-descriptive method was used with literature review and desk research as primary data sources. The SCOR (Plan, Source, Make, Deliver, Return) model was employed to map and evaluate each stage of the hydrogen supply chain. Findings indicated that geothermal- based electricity provides a reliable baseload advantage for continuous electrolysis, enabling stable production. Critical constraints were identified in water treatment, electrolyzer and compressor reliability, storage capacity, and distribution infrastructure. Coordination between divisions and digital monitoring were observed as key enablers for operational stability. Based on the SCOR mapping, recommendations include optimizing electrolyzer efficiency, investing in advanced storage technologies, strengthening inter- departmental integration with unified data platforms, and expanding distribution modes (tube trailers, pipelines, HRS). This research provides a baseline overview for PT. XYZ and supports strategic planning for scalable green hydrogen deployment in Indonesia.
ANALYSIS OF THE PERFORMANCE EFFICIENCY OF THE ELECTRIC SHUTTLE BUS DRIVE SYSTEM RESULTING FROM CONVERSION Rahma Yunia Adini; Ramdhani; Sriyono; Tatang Permana
Jurnal Mekanika dan Manufaktur Vol 5 No 1 (2025)
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/jmm.v5i1.17674

Abstract

This research aims to analyze the performance of the electric drive system in electric shuttle busses converted from internal combustion engine (ICE) vehicles to battery-based electric vehicles. The focus of the study is directed toward evaluating the technical characteristics of the electric motor, battery capacity and endurance, range estimation, power requirements, and the efficiency of the vehicle's drive system. The research method used is a quantitative descriptive method, literature study, and mathematical modeling based on the vehicle's technical specifications, including vehicle mass, battery capacity, power and torque of the electric motor, as well as vehicle resistance parameters such as rolling resistance and aerodynamic drag. The analysis results show that 2 lithium iron phosphate (LiFePO₄) batteries with a capacity of 15.84 kWh can support an operating time of approximately 6.46 hours with an estimated range of 323 km at a speed of 50 km/h. The motor power calculation shows that the electric motor has a maximum power of 96.33 kW, while the actual power requirement of the vehicle on flat roads is only about 4.8 kW. These results indicate that the electric drive system has sufficient power reserves and is technically feasible for use in the converted electric shuttle bus
DESIGN AND CONSTRUCTION OF A HYDRAULIC RAM PUMP Encu Shobari; Alwi Albaar
Jurnal Mekanika dan Manufaktur Vol 5 No 2 (2026)
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/jmm.v5i2.19356

Abstract

Areas whose land surface lies higher than the available water source often face difficulty obtaining a continuous water supply. Using an electric pump to lift water under such conditions increases operational costs because it depends on electrical energy, so an alternative technology is needed that can raise water from a lower to a higher elevation without fuel or electricity. This study aims to design and construct a hydraulic ram pump as a solution for community water needs in Argalingga Village, Argapura Subdistrict, Majalengka Regency, where the elevation difference between the water source and the settlement is approximately 21 m with a distance of about 100 m. Concept selection was carried out using the Analytic Hierarchy Process (AHP) on five design alternatives based on price, working performance, ease of use, maintenance, and service life criteria, with the hydram pump selected as the alternative with the highest final weight (0.290). The pump was constructed from PVC pipe with a 2-inch pump body diameter, a 3-inch delivery tank, and a 2-inch input pipe. Testing was conducted using five variations of input height and input pipe length. Results show that at an input height of 1 m and input length of 8 m, a maximum output height of 13 m was achieved with a discharge of 1.20 L/min; at 1 m and 12 m, output height 13 m with 1.71 L/min; at 2 m and 16 m, output height 17 m with 1.89 L/min; at 2 m and 20 m, output height 17 m with 3.00 L/min; and after extending the output pipe length at the 2 m/20 m configuration, a maximum output height of 21 m with a discharge of 2.12 L/min was obtained. These results indicate that increasing the input height and input pipe length improves both the lifting height and discharge output of the hydram pump.

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