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为改善航空发动机中央传动杆的动态特性,结合某航空发动机中央传动杆的结构及工况参数,采用有限单元法建立动力学模型及方程,对中央传动杆的动态特性进行理论分析.探讨陀螺力矩对临界转速以及中间辅助支点的支承位置和支承刚度对中央传动杆临界转速的影响.提出中间辅助支点最佳位置的确定方法,对中央传动杆的工程设计具有一定的应用价值.分析结果表明:在工作转速范围内,陀螺力矩对其固有频率的影响较小,不大于0.5%;中间辅助支点设置在中间无支点时的二弯“振型节点”处时,可使中央传动杆获得最高的临界转速,以及最大的支承刚度设计裕度.试验结果验证了理论计算方法的正确性.
In order to improve the dynamic characteristics of the central transmission rod of aeroengine and the structure and working parameters of a central transmission rod of an aeroengine, the dynamic model of the central transmission rod is established by using the finite element method and the equation, and the dynamic characteristics of the central transmission rod are analyzed theoretically. On the critical speed and the supporting position of middle auxiliary fulcrum and the influence of supporting rigidity on the critical speed of the central transmission rod.The method of determining the best position of the middle auxiliary fulcrum is proposed and has certain application value to the engineering design of the central transmission rod.The analysis results show that: In the working speed range, the gyroscopic torque has a small influence on its natural frequency, less than 0.5%. When the middle auxiliary fulcrum is set in the middle of the two-corner “vibration mode node” without the fulcrum, the central transmission rod can be obtained The maximum critical speed and the design margin of the maximum support stiffness.The experimental results verify the correctness of the theoretical calculation method.