1985-04-01

Heavy Truck Ride 850001

Designing trucks for good ride characteristics is a challenge to the engineer, given the many design constraints imposed by requirements for transport productivity and efficiency. The objective of this lecture is to explain why trucks ride as they do, and the basic mechanisms involved.The response of primary interest is the vibration to which the driver is exposed in the cab. Whole-body vibration tolerance curves give an indication of how those vibrations are perceived at the seat; however, ride studies have shown that visual and hand/foot vibrations are also important to the perception of ride in trucks.The ride environment of the truck driver is the product of the applied excitation and the response properties of the truck. The major excitation sources are road roughness, the rotating tire/wheel assemblies, the driveline, and the engine. In the low-frequency range the truck's response to these inputs is predictable from rigid-body models of the basic suspension isolation mechanisms, and the pitch-plane tuning to road inputs characterized by "wheelbase filtering." At higher frequencies, the response is influenced by frame bending, cab mounting, fifth wheel position, trailer loading, and other variables. Examples of the influences on ride from these many variables are given

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