Method for eliminating influence of suspension rigidity and sensor quality in free mode test

The invention discloses a method for eliminating the influence of suspension rigidity and sensor quality in a free mode test. When a multi-point suspension support and a plurality of sensors are usedfor testing (the suspension rigidity and the sensor additional mass at each point are known), the frequency response functions related to the points are measured respectively, the influence of the multi-point suspension rigidity and the additional mass of the acceleration sensors in the frequency response functions can be eliminated at a time according to the correction formula provided by the method, the correction efficiency is high, and the actual engineering application value is achieved. 本发明公开了一种自由模态测试中消除悬挂刚度和传感器质量影响的方法，当使用多点悬挂支承和多个传感器测试时(各点处悬挂刚度和传感器附加质量已知)，分别测量与这些点相关的频响函数，根据该方法提供的修正公式即可一次性消除频响函数中多点悬挂刚度和多个加速度传感器附加质量影响，修正效率高，具有实际工程应用价值。