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Farm trucks, otherwise known as a light truck, is a vehicle used to transport agricultural products from farmers in the farm fields. Originally, farm trucks are assembled by local truck workshops using used parts of cars scrapped from abroad. It causes a serious problem in terms of quality and safety, since conventional truck garages are lack of correct engineering principles in the assembly and there has a potential risk of accidents that may occur during use. This study is focused on enhancement of life quality and safety of farm truck users from different regions in Thailand. One problem encountered in the operation is that a clutch case to cover the flywheel-clutch-module, consisting of the engine flywheel and the clutch, is mostly fabricated without applying engineering understanding. This leads to time-consuming trial and errors manufacturing process and overweight parts.

The strength of the superstructure of a bus is very critical to the safety of passengers, both in normal operation and in the event of accident. During the normal operation, the structure of the bus is subjected to several loads, which may be induced by its inertia during vehicle maneuvering (i.e. braking and cornering) or by external loads from the road (i.e. crossing over a speed bump). Moreover, there is a substantial possibility that these loads may lead to a structural failure. Hence, it is necessary to determine stresses occurred in the bus's superstructure to ensure its integrity under these driving scenarios. This paper presents techniques implemented to analyze stresses on the superstructure of a newly designed 15-meter long bus subjected to loads previously mentioned using Finite Element Method (FEM). The stress analysis technique used in each scenario is selected based upon the frequency intensity of load excitations and the dynamic responses of the structure.