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Plastic materials like polycarbonate have increased to adopt as weight reduction material for automotive industry. Specially, with the recent development in coating technology, optical grade polycarbonates are an emerging choice for automotive glazing applications like quarter window, tailgate window, panoramic roof and provide weight reduction up to 50% compared to glass. To use the polycarbonate glazing for automotive. polycarbonate glazing directly connects to the body frame such as SPCC, FRP using adhesives. Connecting mechanism restrains such motions, deformations and allows the panel to partially expand or contract. This paper studies the influence of different material and adhesives about connecting strength of polycarbonate glazing.
In this paper, we studied the reliability test specification development for agricultural tractor using mowing the lawn. To develop the reliability test specification, firstly, we investigated the usage and working conditions of tractor duty mode, weight, working velocity and transmission steps and so on. Usage of tractor is acquired through the investigation of user and working conditions are acquired by the measuring data of the working load. Secondly, we made the test specification of performance, durability using analysis of acquisition data. Developed test specifications were categorized the lab. test and field test, performance and durability. We tested the agricultural tractor performance, durability using developed 62 type test code. We described the test specification development process and test results.
This paper represents the structural design of the light weight axle beam for medium duty commercial vehicle using hot press. To reduce the weight of the axle, axle beam of solid type was replaced by hollow type which was made by hot press. According to the change of axle beam structure and manufacturing method, we have to investigate the structural strength and fatigue performance. To verify the axle beam performance, the structural analysis was carried out by simplified axle beam model and various design parameters that are axle beam height, thickness and width. From the analysis results, the light weight axle beam structure was founded and applied the full model analysis. This study will be used as a guidance in development of the light weight axle for medium duty commercial vehicle.
This paper represents the s-cam manufacturing process with the high-carbon steel like S45C using laser welding system. Laser welding of the high-carbon steel is generally difficult because of hardening of the weld zone. Also, existing s-cam manufacturing process, electric resistance welding system, have some problems like increase of production and development cost. To solve those problems, we are introduced the laser welding system with the pre-heating system for precision welding of s-cam with separated shaft and cam part. S-cam manufactured with optimum laser welding conditions is verified the performance like tensile strength, torsional strength and fatigue test. Strength and fatigue test results are described.
This paper discussed the development of the transfer case involving a 3.5-ton commercial vehicle. A transfer case is mainly used as a power distribution system between the transmission and the front/rear axle. In this paper, the main parts of the transfer case, such as power transfer shaft, helical gear, bearing, etc., were verified through CAE simulation and performance tests. A developed transfer case is not damaged, not even a crack and fracture, after the strength and durability tests. Finally, a transfer case meeting the requirements of a 3.5-ton front axle driven commercial vehicle was developed. The results of the development would be used as an alternate to the existing transfer case after the vehicle test.
In this paper, we studied the working data measuring and analysis technology for tractor development. To measured the tractor power and performance, firstly, we investigated the usage and working conditions of tractor duty mode, weight, working velocity and transmission steps and so on. Usage of tractor is acquired through the investigation of user and working conditions are acquired by the measuring data of the working load. Secondly, we made the measuring system using telemetry for torque, RPM, Pressure sensors and measured the data of 5 duty mode that was the drive, loader, trailer. rotary and mower. It was the engine output torque, RPM, pressure of transmission in each transmission steps and velocity. We decided the performance of tractor through the analysis of measured data and weight of duty mode load.
In this paper, we studied the durability performance evaluation methods of the prototype electric vehicle with limited usage conditions. To perform accelerated durability test, the real usage and some assumed usage conditions are required . The usage load history is regenerated by the combination of measured load history and assumed usage. Regenerated usage load history is compared with the load history of the belgian and standard unfavorable track to make the damage factor and then accelerated durability test velocity and iterations are calculated with damage factor. Based on calculated results, Accelerated durability test is performed the driving target of 20,000㎞ and investigated the safety and performance of the prototype electric vehicle chassis system.
In this paper, we studied the power decision methods of driven motor for electric tractor. To decided the electric tractor power, we require to investigate the usage and working conditions of duty mode, weight, working velocity and transmission steps and so on. Usage of tractor is acquired through the investigation of user and working conditions are acquired by the measuring data of the working load. We made the measuring system using telemetry for torque, RPM, Pressure sensors and measured the data of 5 duty mode that was the drive, loader, trailer. rotary and mower. It was the engine output torque, RPM, pressure of transmission in each transmission steps and velocity. We decided the power of electric tractor through the duty analysis of measured data and weight of duty mode load. As a result, the 7Kw driven motor is decided to develop the electric tractor that alternate 17Kw engine tractor.
In this paper, we suggested the means to improve the strength of the drive shaft, a vulnerable part of the drive axle system in a 3.5-ton commercial vehicle. Drive shaft is composed of a universal joint with spider and yoke, yoke shaft, etc. To enhance the strength of the drive shaft, the design parameters of the spider, such as distance and diameter, were revised after CAE analysis. Drive shaft is designed as four case analysis models with ANSYS. These models can analyze the strength of the drive shaft and validate the results of the analysis with four case models. Finally, we suggested a spider design that reduced the spider’s maximum stress by 44 %.
This paper presents an improvement in the design of the transfer case helical gear for a 3.5 ton commercial vehicle. Helical gear has been used increasingly as a power transmitting gear due to its relatively smooth and silent operation, large load carrying capacity, and high-speed operation. The bending stress is a key parameter in gear design. Theoretical equation and FEM analysis were used to determine the bending stress of the helical gear. The major factors in a theoretical equation were based on AGMA standards, and a simplified finite element model was created. The results obtained from the FEM were compared with the theoretical equation, and the difference in the maximum bending stress was discussed.