Due to the damping effects of its porosity and material stiffness, PM-gears offer a high potential for anoptimized NVH behavior. In contrast to the tooth flank, which is cold rolled to increase the density in thehighly stressed surface zone, the gear body of gears is usually oversized in terms of load-carryingcapacity, which results in degrees of freedom in the design.This report evaluates the influence of the geometry and the density of the gear body on the dampingbehavior of PM-gears. First, the eigenmodes of gears are simulated depending on geometry and densityof the gear body, whereby the eigenfrequencies are determined. In a second step, the simulation isvalidated by impulse hammer tests. Additionally to the eigenfrequencies, the damping ratios of differentgear bodies are measured and classified. The results of the theoretical and experimental investigationare compared and the influencing factors are discussed and evaluated.
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