Kasem Bundit Engineering Journal

การลดจำนวนแบตเตอรี่รถจักรยานยนต์ที่ไม่เป็นไปตามข้อกำหนดด้วยการออกแบบและวิเคราะห์การทดลอง

2025-02-16T15:54:29+07:00

This study aims to reduce the quantity of non-compliant battery in the production process of the A7 motorcycle battery. The production process faces the issue of improper internal resistance of battery, which exceeds the standards. This problem is caused by inappropriate settings in the pressure, stopper distance, and degree of the cell holder. To solve the problem, the 2^k factorial experiment design was employed to determine the optimal production conditions. The results showed that all factors, both main and interaction effects, significantly influenced the internal resistance of the battery. The optimal conditions were found to be pressure of 5 megapascals, stopper distance of 24.25 millimeters, and cell holder angle of 14 degrees. When these optimized conditions were implemented, the average internal resistance of the battery was significantly not more than 1.15 milliohms. The implementation of the findings led to a significant reduction in the cost of defectives, with the monthly loss dropping to 10,784 Baht, a 64.14% reduction compared to the pre-improvement losses.

การหาพารามิเตอร์ของระบบระดับความเสรีขั้นเดียวไม่เชิงเส้นที่ถูกเหนี่ยวนำให้เกิดการสั่นสะเทือนด้วยกระแสหมุนวนของกระแสลม

2024-12-09T12:56:22+07:00

This study presents a method for identifying the nonlinear parameters of a structure subjected to wind-induced vibrations caused by vortex shedding. It highlights the differences in natural frequencies between systems modeled using linear and nonlinear mathematical approaches. In this research, the Scanlan model, a nonlinear aerodynamic model, was selected due to its ability to provide more accurate results than linear models. To estimate the nonlinear parameters of the system, the Volterra series was applied as a theoretical framework to design for a target natural frequency. Partial results based on the Scanlan model showed that this parameter estimation method produced accurate outcomes. Furthermore, the aerodynamic stiffness parameter, which was additionally considered in the nonlinear model, was determined using the damped natural frequency method in conjunction with the Volterra series, also yielding precise results. Using assumed parameter values, the natural frequency of the system based on the linear model was found to be 84.01 rad/sec, while the nonlinear model produced a natural frequency of 85.18 rad/sec, reflecting a 1.37% difference. This discrepancy arises from the inclusion of aerodynamic stiffness during structural vibration in the nonlinear model, which increases the system’s natural frequency compared to the linear model that only accounts for structural stiffness. This principle can be applied to avoid structural damage caused by resonance when the structure vibrates at its natural frequency due to wind excitation. Alternatively, it can be used constructively—for example, in bladeless wind turbines where controlled vibrations are used to generate electricity with high precision in determining the output frequency.

TRAVELING SALESMAN PROBLEM FOR OPTIMAL TOURIST ROUTE IN AYUTTHAYA

2025-05-17T15:00:52+07:00

This paper explores the traveling salesman problem (TSP) in the context of planning one-day trips for travelers to historical, cultural, and ecotourism sites in Ayutthaya Province, Thailand. A cloud-based decision-making software was introduced to address this issue which combines the Clarke-Wright algorithm with the honey bees mating optimization algorithm. Through experimental evaluations on TSP benchmark problems and real-world traveler data, it was found that the proposed method is on par with some of the leading existing algorithms. As a result, travelers can effectively plan optimal tourist routes.

AXIAL COMPRESSION BEHAVIOR IN BRICK MASONRY WALLS: A COMBINED EXPERIMENTAL AND ANALYTICAL STUDY

2024-09-17T23:59:19+07:00

In construction most of the buildings are constructed using brick as a load carry element while there are no standard guidelines and references to practice during preparation of bricks. There is no documented performance sheet available for the mechanical properties of bricks. In this study, bricks using different type of soil as per geological map of Pakistan manufactured by the conventional and zigzag technology are investigated for their mechanical properties. For the comparative analysis of the mechanical properties for the said brick types, 15 masonry prisms along with 10 masonry walls are constructed and investigated for the axial compression. Digital image correlation (DIC) is used to cross-validate the results of deformations measured with linear variable displacement transducer (LVDTs). Furthermore, software models using Abacus are used to correlate the damage analytically. It was observed that zig-zag bricks have more compressive strength than all other conventional bricks although bricks manufactured in Peshawar performed better than other counterparts. The results of this study can be used for designing the experimental program and effective decision-making techniques for mechanical properties of bricks in midrise masonry structure.

การประเมินการปลดปล่อยคาร์บอนไดออกไซด์และประสิทธิภาพพลังงานจากกระบวนการผลิตเชื้อเพลิงอัดแท่งจากใบสับปะรดศรีราชา

2025-05-22T10:05:42+07:00

This research investigated the carbon dioxide (CO₂) emissions and energy efficiency of the production of briquetted fuels including briquetted biomass, torrefied briquetted biomass, and briquetted biochar, produced at both laboratory and pilot scales, using Sriracha pineapple leaves. The results showed that briquetted biomass production led to low CO₂ emissions and high energy efficiency of 2.31 kgCO₂-eq and 52.38%, respectively. However, this type of fuel had a low heating value, a large quantity was thus required for effective use. In contrast, the torrefied briquetted biomass and briquetted biochar had higher heating values but resulted in increased CO₂ emissions and lower energy efficiency. These were due to the high energy consumption required for biomass energy decomposition, especially in biochar production through pyrolysis which involves high temperatures. After that, the biochar production process was scaled up to the pilot scale using a 200-liter kiln equipped with a condensation system for condensing volatile gases into wood vinegar and recirculating the remaining non-condensable gases as co-fuel. The energy efficiency of the process was improved compared to laboratory-scale biochar production, which did not reuse the biomass gases. This demonstrated a more efficient energy utility. Additionally, this process emitted less CO₂ than other methods due to partial carbon sequestration in the form of wood vinegar and reduced fuel consumption for heating during pyrolysis. Biochar could have the potential use of biochar as a carbon sink when applied as a soil amendment as well. The findings from this study provided preliminary information for selecting appropriate briquetted fuels production methods, according to production and utilization objectives for both laboratory and industrial scales.

การศึกษาการผลิตถ่านอัดแท่งจากวัสดุเหลือทิ้งจากกระบวนการแปรรูปมะขามเปรี้ยวยักษ์

2025-04-11T13:49:11+07:00

This research explores the potential of transforming waste materials from the giant tamarind processing industry into valuable charcoal briquettes. The study focuses on the waste generated by the Giant Tamarind Community Enterprise Group in Wang Nok Aen Subdistrict, Wang Thong District, Phitsanulok Province. The study found that a 1 : 0.05 : 0.5 ratio of peel/seed, cassava flour, and water is optimal for compressing blocks, as it allows for good shaping and shape retention. Charcoal briquettes produced from giant tamarind seeds were characterized using ASTM test standards for heat value (D3286), moisture content (D3173), ash content (D3174), and volatile matter content (D3175). The analysis revealed respective values of 6,468.14 cal/g, 0.09%, 5.04%, and 91.95%. In contrast, charcoal briquettes derived from giant tamarind peels, tested under the same ASTM standards, exhibited a heat value of 6,812.73 cal/g, moisture content of 0.05%, ash content of 6.19%, and volatile matter content of 84.33%. These findings, when compared against relevant standard values, demonstrate the viability of both tamarind peels and seeds as biomass fuel sources.

MIXED-INTEGER LINEAR PROGRAMMING MODEL FOR PRODUCTION PLANNING AND LABOR ALLOCATION IN THE MELON FARM

2025-06-09T12:05:47+07:00

This research investigates the optimization of the melon supply chain, aiming to minimize production costs through the development of a mixed-integer linear programming (MILP) model. The framework addresses key inefficiencies in current practices, such as suboptimal cultivation scheduling, inefficient labor allocation, and excessive reliance on outsourced workers, by integrating critical decision variables, including planting schedules, harvesting timelines, and workforce planning. The proposed model enables systematic and data-driven management of greenhouse farming operations. Computational experiments using Premium Solver V2023 demonstrate the model’s practical effectiveness, achieving a total production cost of 134,400 THB, which represents a 10.16% reduction compared to manual planning, while maintaining production efficiency. These results highlight the potential of mathematical optimization in supporting sustainable agricultural practices and enhancing decision-making processes. Ultimately, the framework functions as a valuable decision-support tool for both farmers and agribusiness managers in optimizing resource allocation and production.