6.在模态试验设置过程中,激振器应该在什么时候连接到结构上去?

激振器相关问题

 When performing experimental modal analysis with shakers, generally all accelerometers are mounted and cables are run from the structure to the data acquisition system before the shakers are attached to the test article. The shaker set up, stinger attachment, and alignment are usually the last steps in the process. If attached before the rest of the instrumentation is set up on the structure, the shaker could be damaged due to settling of the structure on its soft supports or shifting of the structure during the course of test setup. This will cause misalignment of the shaker/stinger setup which may lead to incorrect measurements. As a result, the shaker is generally the last item to be set up and aligned when performing modal testing.

用激振器进行试验模态分析时,一般情况下,在激振器连接到试验工件之前,安装所有的加速度计,将电缆从结构连接至数据采集系统。通常过程的最后步骤才是激振器设置,推力杆连接和对中。如果在仪器的其他部分完成设置之前连接到结构上,因为结构在其软支撑上安定下来或者在试验设置的过程中结构移动,可能会造成激振器损害。这会引起激振器/推力杆设置的不对中,可能导致测量结果不正确。因而,进行模态试验时,通常最后进行激振器设置、对中。