用于振动抑制的正位置反馈控制及其FPGA实现

Vibration reduction using positive position feedback control and its FPGA implementation

使用正位置反馈控制(PPF)对结构进行振动抑制。阐述了正位置反馈控制器的基本形式并分析了其控制机理,说明PPF控制器可以达到主动阻尼的效果,且具有较高的鲁棒性。详细分析了FPGA(可编程门阵列)平台用于主动控制的优势以及在FPGA平台上对控制器进行快速原型实现的基本流程。完成了基于FPGA的PPF控制器设计,通过同位配置的压电片作为传感和驱动元件,实现对飞机壁板其中的一个模态的振动控制。实验结果表明,使用FPGA可以实现常规控制器难以完成的高速反馈控制,且简化了控制系统,振动控制效果可达8分贝。最后根据对控制器不同阻尼比参数的选取,阐述了阻尼比对控制效果的影响。

Positive position feedback（PPF）control law is used for vibration suppression.The basic form of the controller and its control mechanism is analyzed,which illustrate that the controller can add active damping to the structure and posses a high robust stability.The FPGA（field programmable gate array）target for active control has notable advantages,and the general process for control law implementation on this target for rapid control prototype is proposed.PPF controller for FPGA implementation is designed to work effectively on this target.Collocated piezoelectric patches are used as sensor and actuator respectively.An experiment is carried out to suppress one vibration mode of an aircraft stiffened panel.The control results show that ultra high control rates could be obtained when PPF control law is implemented on FPGA target.The vibration level is lowered by 8decibels and the control system is simplified.Different damping ratio of the controller＇s influence to control performance is also analyzed.