Design The Device Of Temperature Control And Experiments For Flexure Type Giant Magnetostrictive Actuator

Giant Magnetostrictive Material (GMM) is a new kind of smart material, which has the advantage of long travel range, low voltage drive, high power and large load capacity, etc. It has a promising prospect in the fields of precision finishing machining, vibration control, fluid control, underwater transducer, etc. This dissertation emphasizes on flexure type Giant Magnetostrictive Actuator (GMA), which is driven by field coil, and under the stituation of big current and long time working , actuator will be accumulated heating. The internal temperature change will have serious influence on the output of the actuator. Thus, it is significant for the temperature control of the GMA. The extension coefficient and thermal expansion of the GMM relate to the temperature. Therefore, the work temperature has great importance to the GMM. So the work temperature provided to the GMM must be constant and can be adjusted precisely.GMM is surrounded by the drive coil in the closed area of GMA, so it is difficult to realize temperature control. At present, the solution can be attributed to passive compensation and active temperature control. The passive compensation contains software control compensation, thermal expansion offset compensation , flexible support structure compensation. The methods of active temperature control mainly take the form of phase change temperature control , compulsory water temperature control. Thereinto, the method of passive compensation can not be used for flexure type GMA. In the method of active temperature control , for refrigeration tablets structural limitations, semiconductor refrigeration temperature must be controled from the end. It is difficult to ensure the internal temperature of the GMA. Simple it is quite difficult for mandatory water control, dynamic stability is difficult to eliminate; pure phase change temperature control can not be working for a long time.In view of the above this dissertation is presented a new temperature control method of combination of based on the flexure type GMA. The method has both value of phase change and water cooling, and that the method of phase change temperature control breakthrough in working time limits, as well the water cooling temperature control can eliminate dynamic instability. Using finite element analysis, build the temperature field model of flexure type GMA, its structure has been optimized device design, and in the absence of their respective temperature control device and a temperature control device for both steady state Thermal analysis; at the same time, using fuzzy parameters self-tuning PID control algorithm for control; design of the controller hardware; and various loading conditions studied.