Abstract:
Background The structure of cantilever has existed in solid surface antenna for high power microwave system. It is difficult to maintain the low acceleration for feed source structure of solid surface antenna during external vibration excitation. The traditional dynamic vibration absorber has a good control effect on the structure of cantilever. However, the application of traditional dynamic vibration absorber is limited to a narrow range of frequency.
Purpose This study aims to solve the problems of large acceleration and narrow range of frequency in traditional vibration absorber of solid surface antenna. A kind of active vibration control method combined with optimal passive absorber is proposed in this paper.
Methods Firstly, the best installed position of dynamic absorber is obtained by analyzing and simulating the model of solid surface antenna. Secondly, the optimal parameters are calculated according to the mathematical model of simplified passive dynamic absorber system. Thirdly, the sliding mode control parameters were obtained by considering the external excitation using an active absorber method. Finally, the stability of sliding mode control method was demonstrated.
Results This control method combined sliding mode control with an active control absorber, which can reduce the vibration response of antenna effectively. This paper simulated the two-degree-of-freedom vibration system with active control absorber, which gave time-domain vibration response of antenna. The top point displacement of antenna under the predetermined excitation was reduced more than 95% by comparing the condition of no control strategy.
Conclusions This vibration control method can effectively reduce acceleration for feed source structure, enabling it to maintain a more stable state. Furthermore, this controller can be extended to control the acceleration of various cantilever structures in pulse power equipment.
下载: