The Optimal Design And Control Of Six‐degree Vibration Isolation Platform

With the development of space technology, the requirement for the stability of the equipments on the satellites is becoming higner and higher. Most disturbing signals come from CMGs. CMGs are used to produce torque, which can adjust the posture of satellites. But at the same time, signals we don’t need follow.This subject is derived from one pre-development project, which aim to isolate the signals we don’t need by designing one six-degree vibration isolation platform. And then, ensure the stability of the satellites.The whole article is told from several aspects like below.1. The first chapter mostly introduced the characters of defferent vibration isolation materials and their application occations. At last the spiral steel spring is choosed as the main vibration isolation part. In addition, the Stewart mechanism is introduced, which can achieve the vibration isolation from six degrees. 2. The whole vibration isolation platform is designed according to Stewart, which include six same legs. One leg is designed. At first, the load on spring and the movement distance come out from the simulatin by adams. The spring can be designed by the two parameters; and then the hooke joint, the spherical hinge and the sleeve are improved. The precision is higher and the parts are more reliable. At last, the stents used to support the CMGs are optimized. The strength is higner and the stiffness is higher. 3. The third chapter did some research about the single degree vibration isolation from the theory and the simulation. The disturbing signals whose frequency is lower than natural frequency can be passed completely, and the resonance peak exist. In order to solve these two drawbacks, use the active and the passive unite vibration isolation. The velocity negative feedback is choosed as the best feedback signal used in active control by theory modeling. At last, the effectiveness is proved by simulation and experiment. 4. The forth chapter did some research about the whole vibration isolation platform by simulation, respectively from along the Z axis and rolling the Z axis. And the result is effective.