Dynamic characteristics of a motor-driven multistage gear system under impact load

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (19) : 253-260.

YI Yuanyuan1, QIN Datong1, LIU Changzhao1,2

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Abstract

To investigate interaction mechanism of a motor-gear system under non-steady state conditions,an electrical-mechanical coupled dynamic model for a motor-driven multistage gear system was established considering electromagnetic characteristics of motor and torsional vibration of gear system. The system’s natural frequencies, modal shapes and modal energy distribution were obtained. The gear system’s torsional vibration features under impact load and the motor’s current frequency spectrum features were simulated and analyzed to compare different gear pairs’ use factors and dynamic load factors, and conduct verification tests. The results showed that impact load causes the system to have transient free vibration dominated by the first order mode; torsional deformation energy is larger at motor shaft, sun gear shaft and gear ring support,these places are the system’s weak parts; multi-stage gear coupled vibration affects the system’s high speed stage greatly to cause the load factor dropping from high-speed stage to low-speed one; in steady state operation stage and transient impact one, the gear system’s torsional feature frequencies can be reflected in the motor’s current signal.

Key words

multistage gear / nonstationary operating conditions / torsional vibration / motor current signature analysis / dynamic load

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YI Yuanyuan1, QIN Datong1, LIU Changzhao1,2. Dynamic characteristics of a motor-driven multistage gear system under impact load[J]. Journal of Vibration and Shock, 2019, 38(19): 253-260

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