The wind-induced vibration control of feed supporting system for large spherical radio telescope using electrorheological damper

Considering the wind-induced vibration of the feed supporting system with cables for the optomechatronics design project of next generation large spherical radio telescopes, a prototype of adaptive electrorheological (ER) damper is designed to realize additional damping control of this vibration. The model of wind is first developed to implement this design and simulations. The model of the designed ER adaptive damper is described in detail, and the strategy of additional damping control using the controllable field-dependent damping force of the ER damper to counteract the wind force is proposed. The numerical simulation results have shown the validity of the designed adaptive ER damper to suppress the wind-induced vibration of the feed supporting system, and the additional damping vibration amplitude can be suppressed to one-half of the original amplitude without ER damper.

[1]  Seung-Bok Choi,et al.  Control characteristics of a continuously variable ER damper , 1998 .

[2]  B. Y. Duan.  A new design project of the line feed structure for large spherical radio telescope and its nonlinear dynamic analysis , 1999 .

[3]  Young Kong Ahn,et al.  Adaptive Vibration Control by a Variable-Damping Dynamic Absorber Using ER Fluid , 1999 .

[4]  Jianjun Li,et al.  An electrorheological fluid damper for vibration control , 1998, Proceedings. 1998 IEEE International Conference on Robotics and Automation (Cat. No.98CH36146).

[5]  Toshihiko Asami,et al.  Analytical and Experimental Evaluation of an Air Damped Dynamic Vibration Absorber: Design Optimizations of the Three-Element Type Model , 1999 .

[6]  W. Cooper,et al.  SCIENCE IN CHINA. , 1940, Science.

[7]  R. D. Ervin,et al.  A preliminary parametric study of electrorheological dampers , 1994 .

[8]  Robert D. Hanson,et al.  Electrorheological Dampers, Part I: Analysis and Design , 1996 .

[9]  Bernard Etkin,et al.  Dynamics of Atmospheric Flight , 1972 .

[10]  Michael J. Griffin,et al.  a Semi-Active Control Policy to Reduce the Occurrence and Severity of End-Stop Impacts in a Suspension Seat with AN Electrorheological Fluid Damper , 1997 .

[11]  B. Y. Duan,et al.  The mechanical design and kinematics accuracy analysis of a fine tuning stable platform for the large spherical radio telescope , 2000 .

[12]  Roger Stanway,et al.  Vibration control using smart fluids : A state-of-the-art review , 1999 .

[13]  Meyer Nahon.  Dynamics and control of a novel radio telescope antenna , 1999 .