Abstract：The dynamic model of a gear-rotor-casing coupled system considering shafting and casing flexibility was established based on the super element method and node finite element method.Meshing relations of various types of gear pairs were derived.Taking the main reducer of a helicopter as the study object, vibration response tests were used to verify the effectiveness of the model.From the perspective of vibration energy, the multi-stage gear excitation phenomenon generated in the system model when gear pair was taken as a vibration excitation source and transmission characteristics of vibration energy when gear pair was used as a transmission structure were studied under two conditions of flexible casing involving coupling and uncoupling. The results showed that after casing involving coupling, the extreme point number of vibration energy contribution rates of gears of various stages decreases, the vibration energy contribution of gear excitation source near the target point to this point generally increases, whilethat of the non-adjacent gear excitation source to the target point generally decreases; increase in gear meshing stiffness and meshing damping ratio can increase the contribution of gear pairs to vibration energy; increase in meshing error can reduce the transmission capacity of vibration energy, while the coupled flexible casing can enlarge effects of gear meshing characteristics on gear pairs’ vibration energy transmission capacity.
蒋函成，魏静，张爱强，周仁弘毅. 某直升机主减传动系统振动能量传递特性研究[J]. 振动与冲击, 2021, 40(7): 95-104.
JIANG Hancheng, WEI Jing, ZHANG Aiqiang, ZHOU Renhongyi. Vibration energy transfer characteristics of main reducer transmission system of a helicopter. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(7): 95-104.
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