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Research on Vibration Characteristics of Vehicle-Passenger Dynamic Interaction on Highway Bridge （Influences of Natural Frequency of Highway Bridge on Human Comfort） Shuji NISHIYAMA This paper presents an analysis of the vehicle-Passenger dynamic interaction on highway bridge. Automobile seat ride comfort depends on many physical variables. Dynamic deflection on highway bridge induced by moving vehicle is a factor to make a serious influence upon ride comfort. In this paper，influences of natural frequency of highway bridge have been analyzed. The mathematical model has ten degrees-of-freedom；vehicle model with three masses is four degrees- of-freedom，occupant model with four masses, hinged beam model, six degrees-of-freedom. The modal analysis technique has been adopted in equations of motion for highway bridge. The random roughness of real highway surface has been taken into account in the simulation system. Simulated results were very close to experimental values. During application of this system, the effects of natural frequency of highway bridge on human dynamic behavior were investigated. It was found that this factor exerts a serious influence upon human ride comfort. Some results are presented in the form of parametric plots. Key Words；Simulation, Coupled Vibration，Human Engineering，Automobile，Ride comfort，Vehicle dynamics，Guideway Vibration，Resonance |
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