Method for controlling degree of distortion of sine vibrating table

Abstract

The invention discloses a method for controlling the degree of distortion, in particular to a method for performing closed loop feedback control by aiming at excitation signals of a sine vibrating table, which is applied in the field of measurement and control. The method for controlling the degree of distortion of the sine vibrating table adds feedback signals and input digital signals of the vibrating table together to obtain new input signals of the vibrating table by analyzing the baseband phase delay and vibration acceleration harmonic waves in the vibration process of the vibrating table and using a harmonic wave and trapped wave algorithm to calculate feedback control digital signals, and performs D / A conversion on the new input signals so that the new input signals act on the vibrating table through a power amplifier. The method does not need to model the vibrating table, is simple and feasible, can rapidly inhibit the degree of distortion of the vibrating table, reduce influences caused by nonlinear factors and improve the waveform accuracy, and has the characteristics of quick control speed and strong transportability.

Description

technical field [0001] The invention relates to a distortion control method, in particular to a closed-loop feedback control method for the excitation signal of a sinusoidal vibrating table, which is applied in the field of measurement and control. Background technique [0002] Due to the structural design principle of the vibrating table itself, its support spring, non-linear factors such as the magnetic field strength between the air gaps, the installation environment and load of the vibrating table and other factors will affect the excitation signal generated by the vibrating table. When the vibrating table works in open loop, especially under the excitation of low frequency and ultra-low frequency and large amplitude, the distortion of acceleration waveform will reach 10% or even higher, which is difficult to meet the technical index requirements. Therefore, whether the standard vibration table can provide a sinusoidal vibration excitation signal with the minimum harmoni...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention: to solve the problems of difficult modeling, large error and long time required in the prior art vibration table distortion control method, the present invention provides a vibration table that does not need to be modeled and can realize rapid control Closed-loop control method for distortion degree of sinusoidal shaking table

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