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A Vibration Control Method Based on Amplitude-Phase Decoupling of Continuous Periodic Signals

A periodic signal and decoupling technology, applied in vibration testing, machine/structural component testing, measuring devices, etc., can solve problems such as inability to meet high-frequency and high-precision reproduction requirements, inability to apply sinusoidal signals, etc., and achieve intuitive physical meaning. , increase the scope of application, eliminate the effect of zero offset disturbance

Inactive Publication Date: 2018-05-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot be applied to sinusoidal signals with DC components, and cannot meet the high-frequency and high-precision reproduction requirements of continuous periodic signals such as triangular waves other than sinusoidal waveforms.

Method used

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  • A Vibration Control Method Based on Amplitude-Phase Decoupling of Continuous Periodic Signals
  • A Vibration Control Method Based on Amplitude-Phase Decoupling of Continuous Periodic Signals
  • A Vibration Control Method Based on Amplitude-Phase Decoupling of Continuous Periodic Signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] When the vibrator adopts a fluid control system (hydraulic or pneumatic), the transfer function model is as follows figure 1 As shown, the system transfer function expression is:

[0029]

[0030] It can be seen that when the external load force F L When it is not zero, the output y of the system is the same as the input x v There will be a static difference between them, and this static difference will cause the system output to have a zero bias. When the system stiffness is low (such as a pneumatic system), this effect cannot be ignored, and the existing amplitude and phase control strategies can only adjust the amplitude and phase of the sinusoidal signal, and cannot adjust the zero deviation caused by the load force.

[0031] In order to eliminate the DC component error of the reference signal in principle, the present invention proposes a three-parameter amplitude-phase decoupling control method, the control idea is as follows figure 2 shown, for figure 1 T...

Embodiment 2

[0036] Carry out sinusoidal excitation to the air pressure driven vibrator, the load is 30kg, the excitation amplitude is 2mm, the frequency is 15Hz, and the DC component is 0.

[0037] Step 1: Construct the regression matrix H, the specific method is:

[0038] a: Since the excitation signal is a sinusoidal signal, there is only the fundamental frequency component, and N=1 is taken.

[0039] b: Known vibrator servo system sampling frequency f s =1000Hz, satisfy the condition

[0040] c: Construct time series T=[Δt 2Δt ... mΔt] T . Among them, Δt=0.01, satisfying the condition m=10, satisfying the condition m≥2N.

[0041] d: Generate regression matrix:

[0042] h m×N =[0 T sin(ω 0 T) cos(ω 0 T) sin(2ω 0 T) cos(2ω 0 T) … sin(Nω 0 T) cos(Nω 0 T)].

[0043] Step 2: Construct the observation matrix, X 2×m =[X s x f ].

[0044] Among them, X s =[1z -τ z-2τ … z -(m-1)τ ] T u(t),X f =[1z -τ z -2τ … z -(m-1)τ ] T y(t), τ is the delay step size, τ=Δt f...

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Abstract

The invention provides a continuous periodic signal amplitude-phase decoupling vibration control method. According to the continuous periodic signal amplitude-phase decoupling vibration control method, a continuous periodic signal is converted into a direct current component, a fundamental frequency component, and various high frequency components for independent control based on Fourier transform thought. By constructing a three-parameter decoupling controller (three parameters are respectively amplitude, frequency, and offset of a sinusoidal signal), a problem of a conventional amplitude-phase control strategy of inability of eliminating non-linear load force disturbance static errors is solved, and any continuous periodic signal can be reproduced. The control method provided by the invention is capable of breaking through a constraint of inherent frequency of a vibration exciter, and has a visualized physical significance.

Description

technical field [0001] The invention relates to the field of vibration and automatic control, in particular to a vibration control method for amplitude-phase decoupling of continuous periodic signals. Background technique [0002] Vibration test is an important test to verify product reliability, among which continuous periodic signal (sine wave, triangular wave, etc.) is the most common and very important type of test signal. To weigh, it is usually required that the amplitude error does not exceed 10%, and the phase error does not exceed 10°. When the frequency of tracking high-frequency periodic signals is high, if the exciter only uses traditional feedforward + PID to form a closed-loop control, the system will be excited. Due to the limitation of the natural frequency of the resonator itself, the tracking signal presents serious amplitude and phase errors, which cannot meet the requirements of high-precision signal tracking. Therefore, for high-frequency periodic signa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02
CPCG01M7/022
Inventor 田体先姜洪洲赵慧蒋林朱建阳付婷
Owner WUHAN UNIV OF SCI & TECH