1978-01-01

Calculation of the Damping Response of a Four-Wheel Vehicle With Consideration of Transverse and Yawing Vibrations on Arbitrarily Uneven Roadways 785040

Previous studies have not examined the lateral driving forces and vibrations caused by unevenness of roadways in relation to vehicle damping characteristics. The paper presents a method of determining not only vertical vibrations of a vehicle caused by road irregularities, but transverse and yaw movement as well. A simulation model is developed which takes into account the lateral spring-stiffness of the tires, the diagonal stiffness, and the height of the center-of-gravity and of the center-of-gyration. Vibrational amplification factors are discussed and effective (rms) values of vibrations are calculated. Calculations for a representative truck showed:1. Dynamic lateral forces on the tires can lead to frictional losses as do wheel loads.2. The effect of transverse vibrations on vehicle body agitation can be considerable.3. Fixed axles produce a combination of wheel tramp and lateral vibrations in the wheel's resonant frequency range.4. For independent-suspension systems, the height of the center-of-gyration, but not the type of suspension, determines damping characteristics.5. A light, fixed axle with a wide damper track is equal to good independent-suspension in terms of damping

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