4.为何不用螺纹推力杆,而是用“模态”推力杆?

推力杆相关问题

The modal stingers are professionally made with the specific intent of being used for modal testing. They are intended to be used with modal shakers that are equipped with a through-hole armature design with a chuck and collet for clamping the stinger. The stinger can easily slide in the chucks collet until aligned and attached to the force transducer or impedance head, then tightened in place like a drill bit. The thin rod is very weak in the lateral direction, minimizing the transmission of transverse force inputs. The model 2150 series is just 1/16 diameter while the model 2155 series is 3/32 diameter, each with a 10-32 threaded stud brazed on the end to connect to the force transducer or impedance head attached on the test structure. An ordinary threaded rod with a conventional shaker (not specifically designed for modal testing) can be used, but set up and alignment are often difficult and cumbersome. Since these stinger designs are threaded throughout, attaching them to a tapped hole at both the test structure and the shaker armature, at the same time, is rather difficult. These are also typically much stiffer in the lateral direction, generating transverse force inputs, a significant source of measurement error.

模态推力杆是专业制作的,有特定的意图以用于模态试验。它们的目的是用于模态激振器,激振器配有通孔动圈设计,含有一个弹性夹头来卡紧推力杆。推力杆可以很容易地滑入弹性夹头,直到对中并且连接到力传感器或阻抗头为止,接下来现场卡紧,就像钻头一样。细长杆横向非常柔,减少了横向力输入的传递。2150系列直径只有1/6”而2155系列直径是3/32”,每一个推力杆都带一个10-32的一段螺杆钎焊在端部,来连接附加在测试结构上的力传感器或阻抗头。可以使用传统激振器带的普通螺杆(没有专门设计用于模态试验),但是设置和对中通常都困难而麻烦。因为这些推力杆设计是通体螺纹,同时连接它们到测试结构和激振器动圈二者的螺孔,是相当困难的。在横向它们通常也更加刚硬,产生横向力输入,是测量误差的重要来源。