周期性碰摩激励作用下薄壁机匣支撑系统响应机理
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国家自然科学基金青年科学基金(51905025); 中央高校基本科研业务费专项资金(JD1911)


Response mechanism of thin-walled casing support system under periodic rubbing exciation
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    摘要:

    针对发动机薄壁机匣支撑系统在碰摩激励作用下动力学响应复杂,基于机匣振动信号的碰摩故障特征识别难度大的问题,提出了一种用于故障特征机理分析的数值仿真方法。通过建立薄壁机匣系统的等效动力学三维实体模型,将碰摩激励进行等效力学简化,利用瞬态动力学方法对周期性碰摩故障进行了数值仿真。在系统固有特性分析的基础上,对机匣测点在碰摩激励作用下的时域、频域响应特征展开研究,得到了碰摩故障特征的产生机理。机匣位移振动信号主导频率为系统整体低阶固有频率,加速度振动信号主导频率为碰摩脉冲激励频率及其倍频,上述结论可作为碰摩故障发生的依据,为故障早期诊断提供参考。

    Abstract:

    In view of the complex dynamic response law of the engine’s thin-walled casing support system under rubbing excitation and the difficulty of character identification of rubbing fault based on the vibration signal of the casing, a numerical simulation method for the mechanism analysis of the fault characteristics was presented. An equivalent dynamic three-dimensional solid model of the thin-walled casing system was established and the rubbing excitation was simplified by equivalent mechanics. Then the periodic rubbing fault was simulated numerically with transient dynamics method. Based on analysis of the inherent characteristics of the system, the time domain and frequency domain response characteristics were studied and the rubbing fault feature was obtained. The dominant frequency of the casing displacement vibration signal was the low-order natural frequency of the system, and the dominant frequency of the acceleration vibration signal was the rub-impact excitation frequency and its multiples. The above conclusions can be used as the basis for rub-impact faults and provide references for early fault diagnosis.

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韩金昌,左彦飞,冯坤.周期性碰摩激励作用下薄壁机匣支撑系统响应机理[J].航空动力学报,2021,36(1):167~175. HAN Jinchang, ZUO Yanfei, FENG Kun. Response mechanism of thin-walled casing support system under periodic rubbing exciation[J]. Journal Of Aerospace Power,2021,36(1):167-175.

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  • 收稿日期:2020-06-17
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  • 在线发布日期: 2021-02-04
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