Method for controlling soft start of vibrating meter based on three-parameter control

Abstract

The invention relates to a control method for removing the overshoot of a displacement generated by the soft start of a vibrating meter under three-parameter control. Based on the three-parameter control, the method provides an overshoot-correcting arithmetic of an off-line time domain: the method obtains an overshoot theory solution generated by the three-parameter control arithmetic by solving a three-parameter control differential equation in the time domain; and in order to directly remove a transient state component, and by taking trigonometric function and Fourier transform as tools, the method provides a correction method of the overshoot under any input. Compared with the conventional soft start in a windowing way, the method reduces the overshoot, and greatly reduces the on-line calculating amount, thereby improving the operating efficiency of a controller when removing the overshoot of the displacement of the vibrating meter.

Description

technical field [0001] The invention relates to a control method for three-parameter control of the soft start of a vibrating table, belonging to the technical field of testing. Background technique [0002] The three-parameter control algorithm was proposed in the 1970s, mainly to compensate for the defect that the frequency band is not wide and the acceleration and speed control cannot be realized when only the displacement signal is controlled in the earthquake simulation shaking table control. In the three-parameter control, the low-frequency band is controlled by displacement, the middle-frequency band is controlled by speed, and the high-frequency band is controlled by acceleration, so as to achieve the purpose of widening the control frequency band. Due to its advantages of wide control frequency and simple control method, the three-parameter has been gradually applied to the vibration table control in the fields of machinery and mining. The three parameters mainly p...

AI Technical Summary

Problems solved by technology

[0002] The three-parameter control algorithm was proposed in the 1970s, mainly to compensate for the defect that the frequency band is not wide and the acceleration and speed control cannot be realized when only the displacement signal is controlled in the earthquake simulation shaking table control.

The shortcomings of this method are: (1) In the 1-2s before entering the stable working section, the excitation signal is weakened too much

More three parameters are used for test control systems, but many tests are often completed within a few seconds. For example, earthquake simulation shaking table tests with a large scale scale generally only take 3 to 6 seconds, and the peak acceleration is often within 1 to 2 seconds. , so it is difficult to accurately meet the test requirements; (2) Once the windowing function for the system is selected, no matter how much overshoot the input wave produces, the adjustment ratio at the same time is the same, and it is impossible to make specific adjustments according to the actual input wave; (3 ) In this way, the evaluation of the exponential function and signal multiplication must be performed during the entire test online process, which increases the amount of online calculations to a certain extent

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