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Moving vehicle is excited by road waviness. The random dynamic vehicle response is analysed by using frequency analysis. The vehicle transfer function is calculated by using component element method and the random road waviness is characterized by its power spectral density. The power spectral density of several road types in West Java has been measured. Using the measured road power spectral density and the calculated vehicle transfer function, the vehicle responses are analysed. Using this analysis, the vehicle suspension parameters can be found to meet better vehicle running quality.

An experimental study has been carried out on a transmission system which consists of a pair of spur gears mounted using ball bearings on a steel frame and rotated by a frequency controlled A-C electromotor. The vibration sources among the rotating components of the system have been investigated using Campbell diagram technique and its influence on the frequency spectrum at the measuring points located on the frame has been identified. Harmonic as well as random excitation techniques have been conducted to reveal the transfer-function and the frequency spectrum at those measuring points. It is observed, for low frequency range (up to 125 Hz) similar transfer functions are obtained through out the measuring points. On the other hand for high frequency (above 125 Hz) the transfer functions are significantly influenced by the local propagation path.