Integrated Optimization Of Synchronized Switch Damping Control System Based On Piezoelectric Actuator

With the development of aerospace technology,the spacecraft structure is moving toward the direction of large-scale and complicated development.The requirements for vibration control of flexible attachment structures are also gradually increasing.Due to its good electromechanical coupling characteristics and frequency response characteristics,Macro Fiber Composite(MFC)has been widely used in vibration and noise control in the aerospace field.Among the many control methods,the semi-active damping control method based on MFC has the advantages of low energy consumption,no need of accurate modeling of the structure and stable control effect,which has become the focus of recent research.In this paper,the design and optimization of the problems of the original semi-active damping control system of synchronous switch damping are investigated and improved,the control effect and practicability are thus improved.The main contents of this paper include:In terms of hardware design,due to the instability of the original semi-active vibration control system,the overall design of the system is renewed.A protection scheme based on over-current and over-voltage circuit is proposed,the corresponding protection circuit is provided,and high voltage and low voltage circuit isolation scheme has been proposed.In addition,based on the original circuit design,an output channel for the high-voltage circuit is added,thereby simplifying the system composition,to reduce the volume and the weight.Therefore,the integrated optimization and efficiency improvement of the circuit is achieved,and total the energy consumptionis reduced.In the aspect of software system,aiming at the problems of low efficiency of the original system,a RTOS and STemWin GUI based on uC / OS-III were transplanted to improve the operating efficiency of the system and improve the human-computer interaction experience.In addition,an LMS filtering algorithm for extremum judgments is proposed,which improves the filtering effect of the system in ultra-low frequency working condition and further improves the control effect.As fore system integration and verification,hardwares and softwares of the system are combined and tested.The system's high-voltage rollover capability is tested.The stability and reliability of the system under high-voltage conditions are verified.Finally,the practicality of the system is verified by low-voltage vibration control of a metal beam.