Method for suppressing super-amplitude of mechanical vibration table

Abstract

The invention provides a method for suppressing super-amplitude of a mechanical vibration table. The method comprises the following steps that a mounting position of eccentric adjusting mechanisms onthe vibration table is adjusted to enable the vibration table to only excite excitation force in the vertical direction; the vibration table is started, all the eccentric adjusting mechanisms reach abalance position through a control system, the vibration table has no amplitude output, and the vibration table is closed; a tested piece is clamped by using a special clamp; the vibration table is started again, and a frequency converter is controlled to increase the working frequency of the vibration table to reach a rated working frequency; the control system controls the eccentric adjusting mechanisms to generate eccentricity, information is fed back through a displacement sensor, eccentricity correction is achieved through control of an upper computer, the eccentricity of all the eccentric adjusting mechanisms is the same, the vibration table has amplitude output, and the vibration table starts a vibration test; and the test is finished, the control system controls all the eccentric adjusting mechanisms to be adjusted to the balance position, and the vibration table is closes. According to the method for suppressing super-amplitude of the mechanical vibration table, an amplitude step of the vibration table during starting and stopping is avoided, and non-stop adjustment is realized.

Description

technical field [0001] The invention belongs to the technical field of fatigue tests of aviation and aerospace diaphragm parts, and in particular relates to a method for suppressing over-amplitude of a mechanical vibrating table. Background technique [0002] The diaphragm is a high-precision elastic component. When the valve is working, the diaphragm can sense the pressure change and control the opening and opening of the valve. During the working process, since the pressure does not change much, the pressure load is considered 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, so there are strict requirements on their fatigue life in design and processing. And this elastic element is a shock-resistant element with long fatigue life, and its precision requires that no overload is allowed. These special applic...

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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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