3.对激振器的性能而言,对中是何等重要?

 The alignment of the shaker is very important. Significant misalignment may cause damage and/or unnecessary wear to the shaker armature due to resulting side loads. In addition, the forces imparted to the structure will be measured incorrectly due to transverse load components, and the measured response functions will not be correct. This alignment issue causes difficulty in any shaker test. Care must be taken to provide the best alignment possible to attain the best possible measurements.

激振器对中非常重要。明显的不对中可能引起激振器动圈损坏和/或不必要的磨损,是由横向载荷而造成。另外,由于横向载荷分量的缘故,造成不能准确地测得传递到结构上的力,则测得的频响函数不正确。在任何的激振器试验中,这种对中问题导致测试困难。必须注意提供最优可能的对中,以获得最优可能的测量结果。

(In a future updates of this FAQ, measured frequency response functions will be included to show the distortion that may commonly result due to poor alignment.)

(在这个常见问题的后期修订中,将包括测得的频响函数来说明由于对中不良可能普遍导致的失真。)