机械阻抗测试最重要的应用之一,就是由测试数据确定结构振动模态参数,叫做试验模态分析。这也是结构动力学中系统识别技术,即由振动测试数据建立结构动态数学模型的基本内容,称为模态参数识别。有了整个系统的模态参数(模态频率、阻尼,振型和质量),即可得出激振点和响应点的传递函数解析表达式,从而可用于已知动载的动力响应计算;也可用于动力稳定性分析。对于飞行器,加上气动力(气动阻尼和气动刚度),还可用来进行颤振分析;有了亚临界风 Mechanical impedance test is one of the most important applications, is to determine the structural vibration mode parameters from the test data, called the test modal analysis. This is also the system identification technology in structural dynamics, that is to say, the basic content of the structural dynamic mathematical model established by the vibration test data is called modal parameter identification. With the modal parameters (modal frequency, damping, mode shape and mass) of the whole system, the analytical expression of the transfer function of the excitation point and the response point can be obtained, which can be used to calculate the dynamic response of a known dynamic load. Can also be used for dynamic stability analysis. For aircraft, aerodynamic forces (aerodynamic damping and aerodynamic stiffness) can also be used for flutter analysis; with subcritical wind