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An investigation of dynamic behavior of an Indonesian designed and manufactured minibus body has been carried out for determining its modal parameters. For this purpose a finite element modeling of the minibus body has been performed using PAFEC finite element package program. To support the theoretical results then the minibus body is investigated experimentally by measuring the frequency response functions through out the body. The modal parameters are extracted from the inertance measured data. For this purpose a curve fitting method based on general case viscous damping has been developed. The obtained results show a good agreement between the theoretical and the experimental data.

One of the factor which determine vehicle ride quality is the waviness of the road surface. A series of power spectral density measurements has been done on several road types in West Java, that is Macadam, Nacas, Coldmix Buton Asphalt and Hotmix Buton Asphalt. The measurement were carried out by means of fifth wheel and the data were digitally analysed using Spectrum Analyser and Desktop Computer, The results would be very useful for the development of vehicle design, and for the construction of the road itself.