航空发动机

秦天龙，葛向东，路阳，吴法勇，乔保栋.航空发动机转子不平衡敏感性试验[J].航空发动机,2024,50(6):149-154

航空发动机转子不平衡敏感性试验

Aeroengine Rotor Unbalance Sensitivity Test

DOI：

英文关键词:rotor unbalance field balancing vibration phase unbalance sensitivity test aeroengine

基金项目:航空动力基础研究项目资助

作者	单位
秦天龙，葛向东，路阳，吴法勇，乔保栋	中国航发沈阳发动机研究所，沈阳 110015

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中文摘要:

针对航空发动机在相同物理转速下出现的高振动幅值异常模式和低振动幅值正常模式的振动双稳态特征问题，开展了整机条件下核心机转子不平衡敏感性试验研究。通过局部小分解调整核心机转子不平衡状态，获得不同平衡状态下发动机轴承座振动响应；分析发动机整机振动对核心机转子不平衡的敏感性。结果表明：不同平衡状态下振动异常模式振动相位收敛于相同角度，引发振动异常模式的不平衡量出现在固定的角向区间；高转速振动异常模式下轴承座测点振动相位滞后角为120°～150°；在核心机引发振动异常模式的不平衡量角向位置对向添加配重可以有效消除振动异常模式，解决振动双稳态问题。在同型多台发动机上进行了验证，平衡准确率超过80%。

英文摘要:

During an aeroengine test, there occurred a bistable vibration phenomenon consisting of a high-amplitude vibration abnormal mode and a low-amplitude vibration normal mode at the same physical speed. To address this issue, unbalance sensitivity tests of the core engine rotor under whole engine state were conducted. By adjusting the unbalanced state of the core rotor through small-scale local disassembly, the vibration responses of the engine bearing seat under various balanced states were obtained, and the sensitivity of the whole-engine vibration to the unbalance of the core rotor was analyzed. The results show that in various unbalanced states, the vibration phases of the abnormal vibration mode converge to the same angle, and the unbalance causing the abnormal vibration mode occurs within a fixed angular range. The phase lag angle of the bearing seat measuring point ranges from 120° to 150° under high-speed abnormal vibra? tion mode. Adding counterweights at the angular position to the opposite side of the unbalance causing the abnormal vibration mode of the core engine can successfully eliminate the abnormal vibration mode and solve the bistability problem. It has been verified on multiple engines of the same model, and the balance accuracy exceeds 80%.

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