现场测量表征激励源的部件传递路径分析方法研究

在经典的传递路径分析（Transfer Path Analysis，TPA）方法中，由于激励源内部激励力通常难以测量，而通过被动部件连接界面的接触力求解，但测量传递函数时需要移除激励源解耦，工作效率大大降低。为了解决这一问题，研究了一种部件TPA方法，在不移除激励源的情况下现场测量传递函数，利用一种表征激励源固有特性的约束力求解。以一套模拟发动机结构噪声传递路径的试验台架为研究对象进行TPA试验.结果表明，部件TPA对目标点总响应的预测值与实测值相比基本吻合，但对各传递路径的具体贡献量分析与经典TPA相比稍有差异。另外，通过现场测量获得的约束力能够表征激励源的固有特性，当被动部件结构改变时可以对新的目标点做出响应预测。

Research on the component-based TPA method via in-situ measurement to characterize excitation source

The classical transfer path analysis (TPA) method is solved by the contact forces at the connection interfaces of passive components, because the internal excitation force of the excitation source is usually difficult to measure. However, the excitation source needs to be removed for decoupling when measuring the transfer function, which greatly reduces the work efficiency. In order to solve this problem, a component-based TPA method is studied, in which, the transfer function is measured in-situ without removing the excitation source, and the equivalent blocked forces that characterizes the inherent characteristics of the excitation source is used to solve the problem. A set of test bench that simulate the transfer path of engine structure noise are used as the research object for TPA test. The test results show that the predicted total response value of the component-based TPA to the target point is basically consistent with the actual measured value. But the analysis of its specific contribution to each transfer path is slightly different from the classical TPA. In addition, the blocked forces obtained through in-situ measurement can characterize the inherent characteristics of the excitation source, and the response prediction can be made to a new target point when the passive component structure changes.