Precision Machinery Transmission Chain Dynamic Driving Accuracy The Development Of Testing And Analysis System

Along with the wide use of the mechanical rigid driving chains,the test for their drive precision become more and more important.In this paper, a dynamic drive precision testing&analyse system is designed for mechanical rigid driving chains. Different from the traditional static drive precision testing instmments,it is designed based on the virtual instrument idea and is a dynamic precision testing&analyse system .This dynamic precision testing&analyse syetem is designed based on virtual instrument type ; It's hard wares are connected with PXI bus; Moirefringe grating is used to test the drive precision; The grating encoders acquire datas of the displacements from two-channels synchronously and then sent the datas to the counter to measure the dynamic drive error , then the datas composed by the dynamic drive errors is processed by the processor with Wavelete analysis technique to ruduce the niose and to identify the peculiarity of the datas.The part of the data processing of this dynamic drive precision testing&analyse system for rigid mechanical driving chanins is based on the theory of Wavelete analysis .In order to reduce the noise of the datas we adopt Mallat method to analyse the datas and reconstructed them , and achieved expectant effect; search for the besttree under the condition of cost function that is Shannon entropy and analyse the time-frequence peculiarity of the datas under the besttree ,so as to find details of datas that is composed by the testing results.Finally a experiment to test the dynamic drive precision for a harmonic gear driving chain was done with this dynamic precision testing&analyse syetem to confirm the validity of this instrument system developed in this paper.