A modal test support device and using method thereof

Abstract

The invention discloses a modal test support device and a using method thereof. The device comprises: a suspension structure for suspending a test piece; a support structure arranged under the suspension structure for supporting the test piece; The structure matches the support structure so that the stiffness of the modal test support device is zero; the support structure includes a counter-stiffness diamond frame, a telescopic sleeve, a horizontal elastic component and a base, and the telescopic sleeve is respectively connected to the counter-stiffness diamond frame and the base , the horizontal elastic component connects the diagonal of the anti-stiffness rhombus; wherein, the suspension structure includes a suspension beam, a first elastic component and a second elastic component, and the first elastic component and the second elastic component are connected to the suspension beam in parallel, It is used to suspend the test piece, and the elastic stiffness coefficients of the first elastic component and the second elastic component are both half of the elastic stiffness coefficient of the horizontal elastic component. The modal test support device of the invention has low rigidity, meets the modal test requirements of low-frequency structures, and further improves test reliability.

Description

technical field [0001] The invention belongs to the field of machinery, and more specifically relates to a modal test support device and a use method thereof. Background technique [0002] Experimental modal analysis, also known as the experimental process of modal analysis, referred to as modal experiment, is the inverse process of theoretical modal analysis, one of the methods to verify the reliability of finite element analysis, and a necessary and effective means for structural dynamic design one. In the modal experiment, it is very important whether the support method of the tested structural member is appropriate, because the structure will have different modal parameters under different boundary conditions. The modal test is a test that must be completed for large-scale and flexible solar drones, aircraft or structural parts. However, due to the large size and high flexibility of the test piece, its natural frequency is generally very low, and conventional support to...

AI Technical Summary

Problems solved by technology

The modal test is a test that must be completed for large-scale and flexible solar drones, aircraft or structural parts. However, due to the large size and flexibility of the test piece, its natural frequency is generally very low, and conventional support tools are difficult to meet the test requirements. requirements, the reliability of the test is greatly reduced

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