考虑试件与夹具动力学特性的随机振动试验推力估算

分析了随机振动试验中试件和夹具的一阶频率对振动台推力的影响，提出了一种考虑试件、夹具一阶频率的随机振动试验推力估算方法。就一个算例用仿真计算的方法，得到了振动台推力随试件和夹具一阶频率的变化情况。最后通过一个应用实例，验证了该方法的准确性。该方法比传统的刚性假设方法更接近实际，可为大型试件随机振动试验设计提供参考。

Characteristics of Test Specimen and Fixture

The influence of first order frequency of test specimen and fixture on the force of shaking table was analyzed. A method considering first order frequency of test specimen and fixture was put forward in order to estimate the force of shaking table during a random vibration test. The relationship between the force of shaking table and the first order frequencies of test specimen and fixture was obtained through simulation method. The accuracy of the method was proved by an application example. Compared with the traditional rigid assumptions method, this method is more close to the actual, and it can be reference of vibration test design for large-scale specimen.