Aero-engine blade any-order coupling mode excitation method

The invention provides an aero-engine blade any-order coupling modal excitation method, and belongs to the technical field of aero-engine tests, and the method specifically comprises the following steps: inputting a coupling multi-sinusoidal signal to a vibration table; the coupled multi-sinusoidal signal drives the vibration table moving coil table surface to vibrate so as to drive the blade to vibrate; adjusting each sine sub-signal to enable each order of vibration response of the blade to reach a target value; and exciting the blade to be in a state of simultaneous resonance coupling of each order mode. Through the processing scheme of the invention, the coupling vibration of any specified order combination mode of the blade can be stably and accurately realized. 本申请提供了一种航空发动机叶片任意阶次耦合模态激励方法，属于航空发动机试验技术领域，具体包括如下步骤：向振动台输入耦合多正弦信号；耦合多正弦信号驱动振动台动圈台面振动从而带动叶片振动；调节各正弦分信号，使叶片各阶振动响应达到目标值；激励叶片处于各阶模态同时共振耦合状态。通过本申请的处理方案，可稳定精确实现叶片任意指定阶次组合模态耦合振动。