Research On Design Of Giant Magnetostrictive Actuator And Its Characteristics In Application

With the unceasing development of the technique, the hydraulic fluid control technique and computer control technique are making high progress. Especially in recent years, with the development and improvement of computer, especially SBC or micro-actuator of low price provides indispensable conditions for digital of the hydraulic systems. The digital technique has been applied widely in hydraulic control system, this make the mechatronic technique of the hydraulic components step grown up.This thesis mainly studies the application of the direct digital technology on hydraulic systems, viz. the technique of the fast on/off digital valve. High speed on/off digital valve is an excellent conversion element can directed contact with computer which has been raised since 1990's, it has many merits such as high response speed, good ability of resisting contaminated oil. This kind of hydraulic valve has the control function through the PWM signal, and carries on the continual control to the hydraulic valve current capacity through the control of pulse frequency or the pulse width. Because this kind of valve and the micro controller no longer needs the A/D transformation connection, the complex connection electric circuit has been greatly simplified. So high speed on/off digital valve is a promising digital valve, and it is necessary for modernization of industry to develop this digital valve.The new high speed digital on/off valve was composed of PWM modulator, actuator using GMM, displacement lever amplifier and cylindrical slide valve, In order to form undulates slightly continuously fluid, must enhance its on/off frequency. Therefore the key to make this kind of valve practical application is further enhancing the response frequency of the high speed figure switch valve, reducing its response time, improving its performance. This thesis considered the difference between actuator making with GMM and traditional actuators such as: electro-magnetic, electro-strict .Then we got the merit of the actuator with GMM. On the basis of the theory of high speed on/off valve, this thesis studies and analyzes its construction, work principle. According to its electromagnetism characteristics and machinery characteristics, we established the mathematics model and then turned the mathematics model into linearization and converted into the transfer function pane diagram using the matlab with simulink software, we converted the mathematics module into simulation module. After fell number into parameter, digital simulation. In this foundation, studied and analyzed the influence of each kind of parameter (pulse width, coil number of windings, displacement enlargement factor, frequency and so on) to the high speed figure switch valve, and obtained the rules. By the optimization ITAE, the high speed on/off valve model was carried out parameter optimization, we can get optimization parameters. For the lack of experiment conditions, we got the result just by the simulation. From the simulation result, we can know that change the ratio of the lever and winding, performance of the high speed on/off valve was enhanced.This goal of this topic is promoting the development of the hydraulic control technology, making the fluid control technology and the computer control technology unified well, in order to adapt the technical trend of mechatronics.