Modal test preload applying device, modal test system and preload applying method

Abstract

The invention provides a modal test preload applying device, a modal test system and a preload applying method, the device comprises a preload applying unit, a preload feedback unit and a preload control unit, the preload applying unit is used for applying preload to a test piece; the preload feedback unit is used for acquiring the preload applying time and the normal displacement of the test piece; the preload control unit is used for calculating a preload value according to the time and the normal displacement, comparing the preload value with a preset preload value, and controlling the preload applying unit to reduce the preload applied to the test piece when the preload value is greater than the preset preload value; and when the value of the preload is smaller than the preset preload value, the preload applying unit is controlled to increase the preload applied to the test piece. According to the technical scheme, the technical problems that in the prior art, preloading cannot be adjusted adaptively and accurately, and stable and complete modal parameters cannot be obtained are solved.

Description

technical field [0001] The invention relates to the technical field of modal tests, in particular to a modal test preload application device, a modal test system and a preload application method. Background technique [0002] In recent years, aircraft flying in the atmosphere and adjacent space for a long time has gradually become a research hotspot. In order to maintain a high lift-to-drag ratio and better stability and control capabilities, such aircraft are designed with control surfaces. Due to the requirements of high performance, light weight and structural functionalization, composite material rods and honeycomb sandwich structures have been widely used in aerospace engineering, especially in airfoil structures and rudder surface structures. These materials have low stiffness. , the flexibility is relatively large, so the deformation of components made of this kind of material needs to be considered, while the deformation of other components of the spacecraft does not...

AI Technical Summary

Problems solved by technology

In the past, the modal research of wing and rudder structures mainly focused on the self-frequency of the airfoil and rudder surface, and the influence of the support parts on the modal frequency was rarely studied.

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