Research On Active Vibration Control Based On Notch Mirror Modified FxLMS Algorithm And Analog Controller Design

With the continuous development of ship technology,the low frequency vibration problem has been paid more attention to and studied.At present,the active vibration control method is one of the main methods to achieve low-frequency vibration control.Commonly used active vibration control is realized by running an adaptive filtering algorithm on a digital signal controller.When the control is stable,the controller is still running the program,but the control weight is already stable,so the controller only performs simple signal calculation functions.Combined with the notch algorithm,a hardware circuit can be designed to realize the function of a controller with a fixed weight,which can effectively save computing power.In this paper,the following researches are carried out on the online identification control algorithm and analog controller circuit:This thesis first studies the design correlation of vibration control algorithms,digital signal controllers and analog controller circuits,and then investigates the current research status of online identification algorithms,notch control algorithms,and vibration controllers.Aiming at the existing shortcomings of control algorithms and analog circuits,this paper proposes a notch algorithm for online identification.Combining the order of the input signal and the control filter in the notch algorithm,according to the basic principles of the filter and operational amplifier,an analog controller circuit is designed in this paper.Based on the simulation of the notch FxLMS algorithm and the Mirror Modified FxLMS algorithm,the simulation of the Notch Mirror Modified FxLMS algorithm is carried out.At the same time,on the basis of the dual-frequency control simulation structure of the notched FxLMS algorithm,the dual-frequency control structure of the Notch Mirror Modified algorithm is derived,and the dual-frequency control effect is verified through simulation.Finally,the simulation of the analog controller circuit is carried out.The control effect and stability of the Notch Mirror Modified FxLMS algorithm,the iterative process of control weights,the identification results of the primary channel and the secondary channel are analyzed;the output characteristics of the analog controller circuit are also analyzed.The pipeline vibration test bench was built,and the frequency characteristics of the reference signal and background vibration were analyzed.Then,according to the iterative formula and simulation results of the Mirror Modified FxLMS algorithm and the Notch Mirror Modified FxLMS algorithm,the control program was written,and the pipeline vibration active control experiment of the two algorithms was carried out respectively.At the same time,the control experiment of the Notch Mirror Modified FxLMS algorithm under different working conditions was carried out.And record relevant data.Experimental results show that both algorithms can effectively control pipeline vibration;under different operating frequencies,the Notch Mirror Modified FxLMS algorithm can also produce better control effects.Produce an analog controller circuit and build a circuit test system.On the basis of circuit simulation,the actual output characteristics of the circuit are analyzed,combined with the control weights in the Notch Mirror Modified FxLMS algorithm,the analog controller circuit is substituted for the digital signal controller,and the pipeline vibration active control experiment is carried out.The Pulse system is used to generate the sine and cosine reference signal input,which is output to the power amplifier after calculation by the analog controller circuit,and finally to the actuator.The experimental results show that under different operating frequencies,the output signal characteristics of the analog controller circuit and the digital signal controller are similar,which can effectively reduce the low-frequency vibration of the pipeline.