A method of combining testing modal analysis with modal synthesis technique is used in this paper to investigate the bending vibration of vehicle's power trains. The mechanical and mathematical model for bending vibration of DD680 bus power train are developed, and the natural vibration property is calculated. Finally, the test is made to check the validity of the model. Results show that the calculation agrees very well with the test. Through analysis, several useful conclusions about subsystems of both large and small mass are drawn and some problems of this bus, such as the excessively high stiffness and unsuitable locations of powerplant mountings which lie in the original design, have been found.
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