Yang Ke-ji

Modelling self-sensing of a magnetostrictive actuator based on a terfenol-D rod

A simplified quasi-static computational model for self-sensing applications of magnetostrictive actuators based on terfenol-D rods is presented. Paths and angle changes in the magnetic moments rotation of Tb0.3Dy0.7Fe2 alloy are studied as functions of compressive stress and magnetic field, and then used to determine the magnetization in its actuation. Then sensing of magnetic induction picked from a driving coil in an actuator is derived. The model is quick and efficient to solve moments rotation and its magnetization. Sensing results of compressive stress and magnetostriction calculated by the model are in good agreement with experiments and will be helpful in the design and control of self-sensing applications in actuators.

Design of an ultra-precision vibration isolation system by imitating the special organic texture of woodpecker's brain

In this paper, a bionic structure model of ultra-precision vibration isolation system is presented by imitating the special organic texture of woodpeckers brain. The vibration isolation system mainly consists of giant magnetostrictive actuators, air-springs, a pedestal and a rubber layer. The air-springs are used to reduce high frequency vibrations, and the giant magnetostrictive actuators are used to reduce low or ultra-low frequency vibrations. In order to reduce thermal distortion caused by temperature rise of coil, a constant temperature cooling system is developed for giant magnetostrictive actuator. In consideration of complex vibration environment and self-nonlinearity of vibration isolation system, a two dimensional fuzzy active control system with two regulation factors is designed. The experiment results show that the bionic vibration isolation system has good performance against floor disturbances. It can be applied to the vibration isolation system of the ultra-precision measuring and manufacturing devices.

Research on an integrative system for automatic dynamic balancing emendation based on PCI bus

According to the dynamic balancing emendation application state in our country (China) and the development direction of this technique, an integrative automatic dynamic balancing emendation system for motor rotor of electric tools, comprising dynamic balancing measurement module, machining module, workpiece transferring manipulator and using PCI bus to exchange information between them, is established in this paper. Meanwhile, a kind of universal computer board, which can be simultaneously applied to above three composing parts of this system for measuring and controlling, is studied and developed, some key techniques about the signal integrity and intelligent, fast input or output data transferring methods for this board are solved. This system has been applied to electric tool industry successfully, its application results testify that the computer board developed in this paper possesses reasonable function setup, steady and reliable performance, wider space for renewal and renovation; Moreover, the system established using this board also characterizes compact structure, high reliability, strong flexibility and high ratio of performance to price, etc.