Abstract
This article presents the application of the fuzzy logic (FL) concept to the active control of a multiple degree of freedom reaction compensating platform system that is designed and used for isolating vibratory disturbances of space-based devices. The physical model used is a scaled down two-plate platform system. In this work, simulation is performed and presented. According to the desired performance specifications, a full range of investigation regarding the development of an FL stabilization controller for the system is conducted. Specifically, the study includes four stages: comprehensive dynamic modeling of the reaction compensating system; analysis of the dynamic responses of the platform system when it is subjected to various disturbances; design of an FL controller capable of filtering the vibratory disturbances transmitted to the bottom plate of the platform system; performance evaluation of the developed FL controller through computer simulations. To simplify the simulation work, the system model is linearized and the system component parameter variations are not considered. The performance of the FL controller is tested by exciting the system with an impulsive force applied at an arbitrarily chosen point on the top plate. It is shown that the proposed FL controller is robust in that the resultant active system is well stabilized when subjected to a random external disturbance. The comparative study of the performances of the FL controlled active reaction and passive reaction compensating systems also reveals that the FL controlled system achieves significant improvements in reducing vibratory accelerations over passive systems.
Highlights
The main objective of this article is to advance the effectiveness of vibration isolation systems
The simulation results reveal that the acceleration of the center of the bottom plate, which is a critical measure of the performance of the entire platform system, is only slightly off against the desired zero acceleration line through the entire simulation history due to the compensation of the fuzzy logic (FL) controller
An external excitation scenario of an impulsive force was applied to an arbitrarily chosen point on the top plate that induces the vibratory motion transmitted to the bottom plate via three coil springs
Summary
The main objective of this article is to advance the effectiveness of vibration isolation systems. The main reason that the two-plate platform system is preferred is that at high operating speed the two-plate platform system gives much improved vibration isolation This is justified by a comparative study of the passive dynamic responses of the two different systems performed in the early stage of the project. The major control goal is to compensate for or completely eliminate the accelerations of the bottom plate of the platform system when subjected to external disturbances such as an excitation occurring on the top plate
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