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Durability evaluation and Fatigue Life estimation for commercial vehicle Chassis and Cab is an important milestone during product design and development. Commonly used methods like endurance testing of vehicles on field, accelerated testing on four-posters or test tracks are time consuming and costly. On the other hand, virtual methods for durability evaluation give useful information early in design cycle and save considerable time and cost. They give flexibility to evaluate multiple design options and accommodate design changes early in product development cycle. Virtual testing methods commonly used in industry for durability evaluation of truck Chassis and Cab are combination of Multi-body Simulation (in software like Adams) and Fatigue Life estimation (in software like FEMFAT). These MBS models for truck are rigid or partly flexible and the simulation run-time increases drastically with increase in number of flexible parts in model.

With the increase in the sensitivity of power steering system in the competitive environment, it becomes essential to provide a trouble free steering system to the customer. Usually major concerns faced in the performance of steering system are related to noise like vane pump whining noise and steering gearbox erratic rubbing noise. Even though selected steering pump and reservoir are quite compatible to the steering gearbox. With the series of Computational Fluid Dynamics (CFD) simulations and field tests, it is found that the cavitation phenomena in steering oil routing lines is responsible for the steering turning noise. In this paper, a developed systematic approach for problem detection to implementation of design solution is discussed.