A method for suppressing the super-amplitude of a mechanical vibrating table

Abstract

The invention provides a method for suppressing the super-amplitude of a mechanical vibrating table, which includes adjusting the installation position of an eccentric adjusting mechanism on the vibrating table, so that the vibrating table can only excite the excitation force in the vertical direction; The system brings all the eccentric adjustment mechanisms to the equilibrium position, the vibration table has no amplitude output, and the vibration table is turned off; the special fixture is used to clamp the test piece; the vibration table is started again, and the frequency converter is controlled to increase the operating frequency of the vibration table to make it reach the rated value. Working frequency; the eccentricity adjustment mechanism is controlled by the control system to generate eccentricity, and through the feedback information of the displacement sensor, the host computer controls to realize the eccentricity correction, so that the eccentricity of all eccentric adjustment structures is the same, the vibration table has amplitude output, and the vibration table starts the vibration test At the end of the test, the control system controls all the eccentric adjustment mechanisms to be adjusted to the equilibrium position, and the vibration table is closed. The invention avoids the amplitude step when the vibrating table starts and stops, and realizes the adjustment without stopping.

Description

technical field [0001] The invention belongs to the technical field of fatigue testing of aviation and aerospace diaphragm parts, in particular to a method for suppressing the super-amplitude of a mechanical vibration table. Background technique [0002] Diaphragm is a high-precision elastic element. When the valve is working, the diaphragm can feel the change of pressure and control the opening and opening of the valve. During the working process, because the pressure changes little, the pressure load is considered to be constant, and the main cyclic load is only the displacement load. Diaphragms are widely used in control systems in aerospace and aviation fields, and their fatigue life directly affects the reliability of the system. Therefore, there are strict requirements on their fatigue life in design and processing. This elastic element is a shock-resistant element with a long fatigue life, and its precision requires that overloading is not allowed. These special app...

AI Technical Summary

Problems solved by technology

There are many problems in this method: the fatigue life of the diaphragm is long, there are many test samples, and the equipment needs to be occupied for a long time, and the large electromagnetic vibration table has high power, high cost, and undertakes various test tasks, so the test time cannot be guaranteed

[0005] Both of the above-mentioned methods have great deficiencies. In the first method, the structure is very simple and the cost is low, but because the two metal materials are in direct contact, the added limiting steel plate is easily damaged and the reliability is not good. high

The variable damper added in the second method has poor adaptability and lacks the ability to adjust to changing circumstances, and its control system has become relatively complicated, and the maintenance cost has also increased

Therefore, the above two methods cannot achieve the effect of low-cost and high-reliability over-amplitude suppression

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