This paper presents a study on vibration and noise of gears made of damping alloy. The logarithmic decrements of damping alloy were measured and compared with those of conventional steel. Vibration acceleration and sound pressure of helical gear pairs and spur planetary gears of damping alloy were measured under various running conditions using a power-absorbing-type gear testing machine, and the results were compared with those for conventional steel gears. Furthermore, the sound intensities of planetary gears made of damping alloy and conventional steel were also measured. The vibration and noise characteristics of these gears were determined. The vibration and noise of helical gear pairs and spur planetary gears made of damping alloy were found to be smaller than those of conventional steel gears.
