| The requirement of environmental vibration becomes more and more important in ultra-precise optical-electron measurement instrument, ultrafine working testing and scientific experiment. Building a huge micro-vibration isolation platform is becoming an urgent demand. Against the status of large scale ultra low frequency air spring vibration isolation platform, which is low damping and poor performance of low frequency, and after analyzing the existing key damping system, a new type differential Electromagnetic Damping System (EMDS) is developed in this article in order to reduce the resonance peak of the platform effectively and improve the low frequency performance of the platform.The working principle of electromagnetic damping system is introduced, and the 3-degree of freedom velocity feedback system module is set up in this article. Furthermore, it's also pointed out how to design the system structure, position of sensors and dampers.After analyzing the existing damping material, electromagnet damper, which has the advantage of fast frequency response speed and large force, is designed in this article. Against the problem of nonlinearity between electromagnet force and driven current, a kind of differential arrangement electromagnet is developed.Based on differential electromagnet, a differential power amplifier is developed, which zone of current output linearity is [0.7A, 1.8A] and the degree of linearity is 0.936% and 1.055%.Finally, application of ADAMS in the simulation analysis of the electromagnet damping system is based on velocity feedback. The result of the simulation is indicated that: the vibration effect of low frequency and resonance peak is decreased with increment of damping ratio, and the high frequency performance is not affected.
|
PDF Full Text Request