The Research Of CNC Machine Tool's Modal Parameters Identification Methods Based On Response Signal

With the developments in science and technology,the machine tool also tends to high-speed, efficient, precise and automation. The requirement of performance is also higher and higher. In order to make machine tool have high-speed,high-efficient and high-quality capability, the structures must have good dynamic characteristics. The dynamic characteristics of machine tool influence the performance , efficiency , stability and reliability of the mechanical structure greatly. It has become an important evaluation target of the performance of machine tool. Therefore,the improvement of the dynamic characteristic has become the most important research subject of the mechanical industry. In this paper, study a method of machine tool's modal parameters identification based on only response signal. The main work of the article is as follow:(1) The actuality of dynamic characteristics research for machine tools' structure and the method of Modal parameters identification was analyzed roundly and systematically, and the problem and shortage was pointed out.(2) Introduced the traditional exciting method for machine tool experimental modal analysized. Designed an exciting method using its own random moving. Analysis the signal was acquisitioned in such circumstances and then Removed the cycle signal.(3) Studied a method of Modal parameters identification based on only response signal (peak picking method), and realized this method through MATLAB software. And then do experimental modal analysis for a free beam with two method(traditional method and peak picking method),comparison the analysis result of two method,proven the reliability of peak picking method. The weakness of XHK5140 machine tool is revised, implement method of revision is discussed...