Abstract
The passenger car transmission today must be more compact in size, lighter in weight and operate more quietly than ever befor. The structure of the transmission case influences gear noise, rumbling noise and booming noise, as these noise phenomena are caused by various powerplant resonance modes. These resonance modes are characterized by the fundamental structure of the powerplant, and their natural frequencies can be estimated using a simple spring-mass system. This paper presents different approrches to the structural design of the transmission case which achieve weight reduction while at the same time satisfying the requirements for noise and vibration perfor mance.
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