Journal of Evrímata: Engineering and Physics

Analysis of Soybean Raw Material Inventory Control Using the Economic Order Quantity (EOQ) Method at the Terang Tofu Factory

2025-01-08T23:12:17+07:00

Kebonagung Terang Tofu Factory is one of the famous tofu industries in Pasuruan City. This business produces raw tofu. This research aims to determine the optimal amount of soybean raw material inventory that the Kebonagung Terang Tofu Factory must have, the right time for repurchasing soybean raw materials, the optimal purchase frequency, and the optimal total ordering costs for procuring soybean raw materials at the Terang Tofu Factory. Kebonagung, Pasuruan City. This research is quantitative descriptive, which describes how the company controls raw material inventories through analysis of the data obtained. The analysis methods used include Economic Order Quantity (EOQ) to determine the optimal amount of raw material purchases, Re-Order Point (ROP) to determine the right time for repurchasing raw materials, annual purchase frequency, Safety Stock (SS) to determine the amount safety stock that the company must have, and Total Inventory Cost (TIC) to determine the company's total storage costs. The results of the analysis using the EOQ method show that the Kebonagung Terang Tofu Factory should order 62,740 kg of soybean raw materials in 2024 with an order frequency of 7 times, ROP of 7.956 kg, Safety Stock of 5,874 kg, and total storage costs of Rp. 172.535.

Performance Analysis of LiFePO4 Batteries as a Replacement for Motorcycle Accumulators

2025-01-19T19:13:46+07:00

Conventional motorcycle batteries, including wet and maintenance-free types, suffer from limited lifespan, sulfation issues, and high maintenance requirements. This study proposes a LiFePO4 battery pack as a superior alternative, integrating a real-time monitoring system for enhanced performance tracking. Compared to conventional batteries, the developed system offers longer cycle life, improved thermal stability, and reduced maintenance. The battery pack consists of LiFePO4 cells (3.2V 6Ah) arranged in a 4-series 1-parallel configuration, delivering a 12V 6Ah output while maintaining compatibility with standard motorcycle battery dimensions. Experimental testing validates the system’s ability to monitor current, voltage, and temperature parameters effectively. The integration of a data logging system further ensures long-term reliability and optimization of battery performance. This research contributes to advancing motorcycle battery technology by enhancing durability, safety, and real-time performance monitoring.

Nigerian Construction Industry Reforms and Private Sector Involvement: X-raying Cost Engineering Roles in Sustainable Infrastructure Procurement

2025-03-11T09:00:01+07:00

This study examines the essential financial oversight cost engineering functions performed in the procurement of sustainable infrastructure. This is against the backdrop of the Nigerian construction industry, which has undergone significant transformation through targeted government policies and reforms, aimed at addressing procurement gaps and enhancing infrastructure development. As a result, innovative procurement methods have been adopted to ensure sustainability in public infrastructure projects. Cost engineering and financial management functions are necessary to ensure fiscal accountability in public project procurement. A systematic review of the extant literature is carried out to x-ray cost engineering roles in sustainable infrastructure procurement. Findings indicate a shift from a predominantly public sector-led approach to one driven by private investment, presenting new opportunities for cost engineering roles. Cost engineering expertise is needed in contract administration, risk mitigation, and financial planning and is instrumental in optimizing Public-Private Partnership (PPP) agreements and ensuring long-term project viability. The study underscores the need for Quantity Surveyors, who are professionally skilled in carrying out cost engineering functions, to strategically position themselves within the evolving procurement landscape to leverage emerging opportunities. This study therefore underscores the importance of diversification, and adaptability in navigating industry shifts in the cost management of public infrastructure projects. By embracing these principles, cost engineering roles will maintain relevance in sustainable infrastructure development. There is thus a need to strengthen the connection between government policies, innovative procurement methods, with a view to catalyse cost engineering functions, and their impact in sustainable infrastructure development.

Propeller Arm Control System Planning for Flying Electric Vehicles

2024-08-02T12:41:58+07:00

This research aims to design and develop a propeller arm control system for a flying electric vehicle. With the increasing need for efficient and environmentally friendly vehicles, this research focuses on control mechanisms that can improve vehicle maneuverability and speed performance. The research methods used include design planning, making motor mounts, and setting up the control system using the FLYSKY FS-i6 remote control and Lithium Iron Phosphate (LiFePo4) batteries. The results of the research show that the designed propeller arm control system can function well, providing a fast and accurate response to commands from the remote control. This research is expected to make a significant contribution to the development of flying electric vehicle technology, as well as opening up opportunities for further research in the field of automotive electronics.

Design for BLDC Motor Control System in Flying Electric Vehicle

2024-08-02T12:48:33+07:00

The choice of control system for a flying electric vehicle/quadcopter is very important, especially for users who have never built or driven a flying electric vehicle. Electrical components which include the flight controller, ESC, battery, BLDC motor and other components have an influence in planning electric flying vehicles. Therefore, a BLDC motor control system is needed so that it can operate according to wishes and needs. The purpose of this research is to find out how the control system wiring diagram works, which includes the flight controller wiring diagram as the main flight control and the Electronic Speed Control (ESC) wiring diagram as the BLDC motor speed controller. The choice of flight controller to operate the electric vehicle flight uses DJI Naza M V2 and electronic speed control uses a flier with a 3s-20s cell count configuration.