Method for controlling degree of distortion of sine vibrating table
A technology of sinusoidal vibration and control method, applied in improving amplifiers to reduce nonlinear distortion, power amplifiers, etc., can solve problems such as large errors, long time required, difficult modeling, etc., achieve obvious effects, simple implementation, and portability strong effect
Active Publication Date: 2010-06-16
深圳中航技术检测所有限公司
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[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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[0048] The present invention will be further described below by specific embodiments:
[0049] see figure 1 , which is the principle block diagram of the first embodiment of the distortion control method of the sinusoidal vibration table of the present invention. In this embodiment, the control system corresponding to the method for controlling the distortion degree of the sinusoidal shaking table of the present invention consists of a D / A circuit 1, a power amplifier 2, a shaking table 3, a laser interferometer 4, a data collector 5, a control algorithm module 6 and an addition 10 components. One end of the D / A circuit 1 is connected to the adder 10, and the other end is connected to the power amplifier 2 and the data collector 5 respectively. The power amplifier 2, the vibration table 3, the laser interferometer 4 and the data collector 5 are in sequence. Then, the data collector 5 is connected to the adder 10 through the control algorithm module 6 . The control algorithm...
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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 degree control method, in particular to a method for closed-loop feedback control for sinusoidal vibration table excitation signals, which is applied to the field of measurement and control. Background technique [0002] Due to the structural design principle of the shaking table itself, nonlinear factors such as its supporting spring, magnetic field strength between the air gaps, and the installation environment and load of the shaking table will all affect the excitation signal generated by the shaking table. When the shaking table works in open loop, especially under the excitation of low frequency and ultra-low frequency and large amplitude, its acceleration waveform distortion will reach 10% or even higher, which is difficult to meet the technical requirements. Therefore, whether the standard shaking table can provide a sinusoidal vibration excitation signal with the smallest harmonic distortion is directly re...
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Inventor 胡春艳李新良陈璐
Owner 深圳中航技术检测所有限公司