2.钢琴丝推力杆如何工作?怎么预紧?

推力杆相关问题

Piano wire stingers are an excellent way to circumvent the problems with lateral stiffness associated with conventional stingers. Essentially the piano wire has no lateral stiffness to speak of. The piano wire is pretensioned with a load that is greater than the alternating load to be applied; a preload of 3 to 4 times the range is considered reasonable. The piano wire is fed through the core of the through-hole shaker armature; it is critical to have a modal shaker that is designed to accommodate this arrangement. A simple preload can be applied with weights or an elastic tie-down strap. With the weight applied, the collet is used to clamp the tensioned piano wire. As long as the applied load during shaker excitation is less that the preload, then the piano wire is an excellent way to transmit force and conduct a modal test, eliminating the effects of lateral stiffness in conventional stingers.

钢琴丝推力杆是避开跟传统推力杆相联系的横向刚度问题的一种良好方法。可以将钢琴丝基本上没有横向刚度。钢琴丝按一定的载荷进行预紧,预紧载荷大于将要施加的交变载荷;3~4倍交变载荷范围的预载荷被认为是合理的。钢琴丝穿过通孔激振器动圈的芯体;有一种模态激振器被设计为适应这种布置方式是很重要的。可以利用重块或者一个弹性系紧的带条来施加简单的预载荷。只要在激振器激励过程中施加的载荷小于预载荷,那么钢琴丝就是一种传递激振力、进行模态试验的非常好的方法,去除了在传统推力杆中的横向刚度的影响。