Abstract
Recent years, automatic transmission in car is prevailed excellent for safety, and comfort. Planetary gear with complicate behavior is used in gear mechanism and may cause a noise at specific frequency. It is very difficult to measure the vibration directly because of narrow space however it is desired to measure the vibration indirectly to understand the behavior of the Planetary gear. This paper describes the technique for prediction on vibration behavior of Planetary gear that cannot be measured the directly.
