4.可以用功放的电流输出来准确地估计输入到测试结构上的激振力吗?

For applications of general vibration testing with large shakers, current is generally considered to be a fairly good estimate of the force applied to the system. However, for modal testing, the shaker is set up with a stinger to attach the shaker to the structure. The stinger assembly may also affect system dynamics. As a result, the force transducer or impedance head should always be measured on the structure side of the stinger in order to measure the force directly imparted to the structure. It is imperative to use a force transducer to measure the actual force imparted to the structure. There is no substitute for measuring the actual force.

对于利用大型振动台进行的常规振动试验应用,电流通常被认为是施加到系统上的力的一个相当不错的估计。但是,对于模态试验,激振器利用推力杆进行设置,连接激振器到结构上。推力杆组件也可能影响系统动力特性。因此,为了测量直接传递到结构上的力,总是应该测量推力杆的结构侧的力传感器或阻抗头。必须使用力传感器来测量实际传递到结构的力。没有什么能够替代测量实际力。