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An analysis was made of vibration phenomena in the steering system of a vehicle, when the front wheels have some amount of unbalance. The program included vehicle running tests and bench tests to ascertain some of the factors influencing vibration behavior. A mathematical model of the vibration system was simulated on a digital computer in as much detail as possible. The resultant understanding of the dynamics of the system as a whole led to an extensive theoretical analysis of selected key parameters.

The DATSUN 28OZ has been widely known as a world-wide sports car. The NEW DATSUN 28OZX, as the succeeding model to 28OZ, has now appeared after being refined on both interior and exterior design. The Suspension and steering system of the new model are improved to get better handling performance and lower noise level. In this paper, the design concepts and techniques of the new suspension and steering system are described. The main themes are as follows the construction of new suspension and steering system handling performance directional stability vibration and noise level

A theoretical and experimental vibration analysis was carried out on the vehicle equipped with independent rear suspension in order to reduce the interior noise. As the results it is confirmed that the following items have the great effects on the transmission of exciting force; namely: (l) Coil-spring location (2) Dynamic stiffness of mounting insulator (3) Rigidity of suspension-member (4) Rigidity of body structure where suspension is mounted These results were applied to the actual new type of vehicle and its interior noise was measured and three-four dB (A) of noise reduction was obtained.