Study Of Dataacquisition And Control Systems For A Six DOF Maglev Vibration Isolation Platform

In recent years, with the development of material science, fundamental physics and life science, there is a great deal of interests to perform scientific experiments within the space science environment using ‘weightless’ conditions of earth orbit.Since there are a major of sources which disturb the spacecraft’s microgravity environment such as rotational movements of the spacecraft for attitude control,on-board equipments and the effects of crew motion causing low frequency, micro amplitude vibration. Many science experiments need an active isolation system to provide them with the qualified microgravity environment. One concept that using maglev has been discussed in this paper for vibration isolating.First of all, we propose the specification of the magnetic suspension table, then demonstrated the theory of vibration isolation using magnetic suspension. A design proposal for the magnetic suspension table is then presented with its component parts discussed.Based on the proposal, in order to get a more accurate control model, a number of tests and calibrations of sensors which will be deployed in control system has been performed. We also constructed a measurement rig to verify the position sensor’s capabilities.We deploy a kind of 2D-PSD as position sensor to avoid extra vibration disturbance of contract measurement as well as sensing the 3-D position and attitude of floater. A mathematic model with configuration of position sensor has been presented with theoretical as well as trial demonstration.A basic dynamic model for one degree of freedom system has been established.A control strategy for this dynamic model has been selected as a result of trade-off in three strategies. A PID controller with lead-lag compensator as well as the corresponding discrete controller has been designed based on classical control theory. Based on the one degree of freedom system controller and the mechanical configuration of our vibration isolation mount, a linearized state-space control system has been presented with theoretical demonstration. Finally, we assess its performance and give experimental results from a basic test environment which has been established to verify capabilities of this vibration isolation system.