Dynamic Characteristic Test Method And Experimental Research Of GMM Smart Component

The Giant Magnetostrictive Material is a kind of smart material that can stretch and deform in the alternating magnetic field, and the Giant Magnetostrictive Material smart component which is made of Giant Magnetostrictive Material has several inherent advanced properties such as high frequency response, large output displacement, high precision, etc. Because of these advantages, the GMM smart component has been widely used in ultra-precision machining, ultra-precision displacement sensor, active vibration control, etc. However, in the process of magnetostriction, there is complex coupling of electric-magnetic-machine. It is because of the coupling, there is a great of difficulty in development and control of the GMM smart component. The test and signal processing of GMM smart component can provide basis for structural optimization and precise control of GMM smart component, therefore, the test and signal processing is of great theoretical guiding significance and application value.In view of the shortcomings of testing and signal analysis for the GMM smart component, this paper introduces virtual instrument technology and utilizes hybrid programming technology based on Labview and Matlab software in building the effective and complete test system. Based on this test system, frequency response characteristic and hysteresis characteristic of GMM smart component are tested, and the same to vibration mode of intelligent boring bar and static output characteristic of eddy current sensor. After then, GMM hysteresis characteristic offline compensation scheme and eddy current sensor signal conditioning circuit are designed for improving the testing and machining accuracy of the whole system.In the first chapter of this paper, the subject of the source and its significance are clarified firstly on the basis of reading a lot of references at home and abroad combined with the practical application of GMM in this subject. And then, the courses of development of the giant magnetostrictive material and its main characteristics and application areas are introduced. At last, this chapter summarizes the characteristics of the virtual instrument and its application status in establishing test system. The main contents of this paper are described in the end of the first chapter.In the second chapter, non-cylindrical piston holes’processing method is described and factors affecting machining accuracy are analyzed. After analyzing functional and performance requirements of non-cylindrical piston hole machining test system, and integrating each functional requirement, the general scheme of non-cylindrical piston hole precision machining test system is established.In the third chapter, the test scheme is established based on analyzing test system functional requirement. According to the test scheme, the selection of hardware such as displacement sensor, the signal generator and so on is completed. At last, the hardware general framework of the test system is introduced, and the hardware performance parameters are summarized.The fourth chapter provides an overview of the Labview and Matlab hybrid programming approach and describes the software framework of the test system, and then divides the software framework modularly. Implementation of data acquisition and preservation and the theory involved in data processing module are analyzed deeply. Finally, the data processing module is debugged to verify its’accuracy, this provides reliable basis for the data acquisition, processing and analysis of non-cylindrical piston hole precision machining.In the fifth chapter, frequency response characteristic and hysteresis characterris-tic, vibration mode of intelligent boring bar and static output characteristic of eddy current sensor are tested on the basis of utilized test system. Offline compensation mechanism was established for non-linear hysteresis and eddy current sensor signal conditioning circuit is designed. And the experiments on non-cylindrical piston hole precision machining are carried out in the final.The sixth chapter summarizes research works of this paper and the further research work is put forward.