Research On Vibration Active Control System Based On Piezoelectric Intelligent Structure

The phenomenon of vibration exists widely in scientific research,industrial production and daily life,which impacts more obviously on the military,aerospace,precision machining,traffic transportation and civil engineering and other fields.With the continuous progress of science and technology,the higher and more urgent requirements are put forward in solving vibration problems of national defense,scientific research and daily production.Therefore,it is necessary to study the specific problems of structural vibration control and it is imminent to solve the practical problems of structural vibration control.In this paper,through the analysis of the research status of piezoelectric smart structure,piezoelectric drive unit and piezoelectric smart structure active vibration control,the current problems in the study of the intelligent structure vibration control were pointed out,the system research on the mini-practical vibration control based on piezoelectric intelligent structure was mainly carried out.Firstly the system was overall designed,then CA-YD-181-10 piezoelectric acceleration sensor with SD1431 charge amplifier was used as the sensing unit,the FPGA+DSP control module and control method were designed,the circuits of data acquisition and conversion module,the SDRAM cache and Flash storage module were designed.The acceleration feedback PID vibration control algorithm was designed,the influence of the control parameters on the vibration control effects was studied by MATLAB,the design and adjustment methods of PID vibration control parameters were given and the validity of the methods was verified by simulation,So the methods can be for practical reference.Aiming at the problems of large-scale,high cost and performance indicators can not meet the higher requirements,the small low-cost and high-voltage driving unit with precision operational amplifier and PA97 as the core was designed,on this basis,the improved methods to improve the output accuracy and reduce the ripple were proposed,thedevelopment of the improved drive unit was completed.Multisim simulation results showed that the static and dynamic characteristics of the drive unit can meet the design requirements.Finally,the whole system was built completely and its performance,as well as the sensor,control and drive unit,was tested.The results showed sensing and control unit can output the effective control signal in a timely manner.The linearity of the drive unit was 58.98 and the maximum nonlinear error was less than 0.69%,the ripple voltage was about 36 mV,the ripple voltage was further reduced to 15 mV after improved.The frequency response can reach 5kHz and the output voltage was±300V,the transmission delay was about 20?s.The drive unit had a better dynamic and static performance,which met the design requirements.The system had a better control output performance and its frequency response reached 5kHz,the control output delay was in the microsecond level.The system can effectively drive the piezoelectric intelligent cantilever structure to generate action contrary to the input signal,which indicated that the system had a certain control drive capability and can be used for vibration control.