A New Adaptive System for Suppression of Transient Wind Disturbance in Large Antennas

Wei Liang,Jin Huang,Jie Zhang

doi:10.1155/2019/2015341

Wei Liang, Jin Huang + Show 1 more

Open Access

https://doi.org/10.1155/2019/2015341

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Abstract

Under transient wind disturbance, vibration deformation of the large antenna surface profile causes deterioration of pointing performance. This paper presents a new adaptive system to suppress unknown transient wind disturbance. First, to monitor the vibration, based on the acceleration measurement and a low-order flexible model considering equivalent identification of forces, the real-time estimation of the vibration state is obtained in an unbiased minimum-variance way. Next, a novel four-cable-actuator mechanism with a circular slide track is proposed for suppressing the vibration, in which the locations of the cable drivers on the slide track are determined according to the attitude of the antenna, and the expected tension distribution of the cables is found by the vibration state and the optimal gain of the linear quadratic regulator (LQR). In the end, the simulation implementation of a 7.3 m antenna under the transient wind disturbance is used to verify the effectiveness of the proposed method.

Highlights

Large antennas are widely used in deep space exploration, satellite communications, radio astronomy, and other fields
Synthetic Design Scheme with Integration of Mechanical, Sensing, and Control Technologies e adaptive system is composed of a vibration monitoring and control system, as shown in Figure 1. e accelerometers placed on the reflector are used to obtain the vibration state of structural vibration deformation (SVD) caused by wind forces and tensions of the cables
En, based on the acceleration measurement and the new system model comprising A, Be1, Ca, and De1, the realtime estimation of the identified equivalent forces and vibration state xk|k is obtained in an unbiased minimumvariance way; for details on the procedures, readers can refer to the original works [14, 15], and the equations used in the paper are given in Appendix

Summary

Introduction

Large antennas are widely used in deep space exploration, satellite communications, radio astronomy, and other fields. E method has been used for input-response estimation by acceleration measurements for structural systems [15, 16] These papers only loaded and identified one or two node forces in one direction. En, based on the acceleration measurement and the new system model comprising A, Be1, Ca, and De1, the realtime estimation of the identified equivalent forces and vibration state xk|k is obtained in an unbiased minimumvariance way; for details on the procedures, readers can refer to the original works [14, 15], and the equations used in the paper are given in Appendix

Cable Tension Controller to Suppress the Vibration Based on LQR

U Figure 4

Findings

Conclusion