Research On Active Passive Integrated Vibration Isolation System Based On Voice Coil Motor And Metal Rubber

When the spacecraft is working,it will be disturbed by vario us vibration loads.The vibration interference has more influence on the sensitive element,which may cause the failure of the device.In order to provide a relatively static environment for the space device,it is necessary to control its vibration isolat ion.In this paper,a suitable vibration isolation platform is designed to reduce the influence of load load on the normal operation of the device.On the basis of the Stewart platform,the six axis vibration isolation platform of the cubic structure is designed.The active part of the actuator adopts the sound coil motor,and the vibration isolation material is tested.The relationship between the compression rate of metal rubber and the parameters of damping,stiffness and natural frequency is analyzed by B&K software,and the suitable compression rate is selected according to the technical requirements.Metal rubber and die spring are used to reduce impact impact between outrigger legs by flexible articulation.The main passive and passive vibration isolation control mode has good vibration isolation effect on the high frequency and middle and low frequency segments.The active control system adopts the decentralized fuzzy PID control.The PID control is widely used in the engineering application,and the control parameters can be adjusted in time to achieve better vibration isolation effect after the fuzzy control is added.In order to reduce the interference of other frequency segments to active control,an adaptive notch filter based on the stand ard LMS algorithm is added to the active control system.The interference wave signal can be effectively filtered through the simulation analysis.On the basis of the standard LMS algorithm,the improvement of the algorithm is proposed,and the normalization algorithm,which considers the secondary channel,is used,that is,x-The NLMS algorithm speeds up the convergence rate by changing the iteration value,and makes the adaptive notch filter more suitable for changing environment.A single degree of freedom leg model is established.Through the simulation analysis of the single degree of freedom leg,the force attenuation rate can reach 98.87% under the primary and passive vibration isolation.The vibration isolation effect of the single degree of freedom and the six axis platform is tested by the exciter respectively.The XPC system is used to control the active algorithm and the vibration isolation platform is used.The low frequency 20 Hz,medium frequency 100 Hz and high frequency 200 Hz signals are excited respectively.The experimental data show that the vibration isolation effect can be well achieved under both active and passive control.The control torque gyro is installed on the vibration isolation platform,and the experimental analysis of the platform is carried out by the decentralized control.The experimental data analysis shows that the attenuation rate of the lower platform force transmitted to the lower platform force is 23.9% higher than the passive vibration isolation under the control of the main passive and passive vibration isolation.