Research On The Force Limited Vibration Stage Based On Electomagnetic And Permanent Magnet Drive Mechanism

With rapid development of aerospace technology, in order to avoid the phenomenon of over-loading and owe-loading in satellite dynamic environment testing experiments,force limited vibration method has been used, and at the same time, which also needs new and more high requirements on theoretical research of vibration testing technology, experimental software and hardware. For the reason of the drawbacks of low frequency test and the magnetic leakage and low efficiency of using magnetic energy in traditional electro-dynamic vibration stage, in this thesis, combined electromagnetic and permanent magnetic multiple drive principle proposed by electromagnetic and permanent-magnet drive mechanism, this thesis focuses on the research of a new force limited vibration stage by using the new drive principle.The main research work presents as follows:In chapter 1, author introduces applications background and current research development of force limited vibration technology. Then, the author gives a brief introduction on common micro-movement drive, vibration drive and current drive applications based upon rare-earth permanent magnet material NdFeB. The research background and contents of this thesis are introduced at the end of this chapter.In chapter 2, the author introduces the main structure of electromagnetic and permanent-magnet drive mechanism at beginning of this chapter. According to concepts of magnetic charge and surface current in electromagnetic theory, the electromagnetic torque calculation model for a rotary permanent magnet rotor under excitation of electromagnetic field is given. Based upon this magnetic torque calculation model, the dynamic equation for the electromagnetic and permanent magnet drive mechanism is derived.Based on the theoretical calculation and analysis in chapter 2, in chapter 3, the electromagnetic and mechanical coupling design of a small vibration actuator is carried out, which mainly includes structure design and optimization of disc spring constraint mechanism, structure design, magnetic circuit simulation, manufacture and assembly for the whole actuator.In chapter 4, the application of electromagnetic torque calculation model and the feasibility of the electromagnetic and permanent magnet combined drive in vibration application are verified through testing an elliptic shape permanent magnet drive mechanism under electromagnetic excitation. Moreover, the vibration drive behaviors of the small actuator at low and high frequency are experimented.In chapter 5, the electromagnetic and permanent-magnet drive force limited vibration stage is subsequently designed with reference to the research of realizing the small actuator. The design work by CAD mainly includes: electromagnetic, permanent-magnet and mechanical integrated design, permanent magnet structure design, electromagnetic and mechanical drive mechanism design. And in this work, a lifting fixed position mechanism, a slit paraffin container, and the sensor component i.e. a piezoelectric sensor stand are specifically designed. Furthermore, the strength of key supporting components, the optimal magnetic circuit of the drive mechanism is checked by ANSYS and Comsol respectively. In the end research of this chapter, a basic PID control system for the force limited vibration stage is proposed.In chapter 6, main work of the thesis is summarized, and the prospective researches are discussed.