The study on fine adjustment of focus cabin suspension of FAST based on the quadric error model of receiver

The control algorithm based on the quadric error model of receiver was proposed for the fine adjustment of Focus Cabin Suspension of FAST. According to the character of rigid-flexible kinematics coupling of Focus Cabin Suspension, the quadric error model of receiver was derived based on the kinematics, statics and the error model of time-varying barycenter of Focus Cabin Suspension to calculate the quadric error value of receiver that was caused by the rigid-flexible kinematics coupling. The equation of control output and the numerical computation method of fine adjustment were given when the quadric error of receiver was considered to decrease the effect of rigid-flexible kinematics coupling on control accuracy of receiver. Finally, the simulation results indicated the control accuracy of receiver was effectively increased than ignoring the quadric error of receiver caused by the rigid-flexible kinematics coupling.