Method and system for quickly testing local static stiffness of mechanical structure

Abstract

The invention provides a method and a system for quickly testing local static stiffness of a mechanical structure, and aims to solve the problem of poor universality in local position stiffness testing of the existing mechanical structure. The method comprises the following steps: installing a to-be-tested mechanical component, and enabling the to-be-tested mechanical component to be in a free boundary state; determining a local test point, and installing a vibration acceleration sensor at the local test point; performing hammering tests on the local test points along X, Y and Z directions by using a modal force hammer to obtain vibration acceleration frequency response function signal data corresponding to the local test points; importing the vibration acceleration frequency response function signal data into a modal analysis system, and identifying modal information parameters of the vibration acceleration frequency response function signal data; performing data processing on the modal information parameters to obtain a modal comprehensive curve; integrating the modal comprehensive curve twice to obtain a dynamic flexibility curve; and based on the dynamic flexibility curve, obtaining numerical values of responses in the X, Y and Z directions at 0 Hz, and calculating and obtaining static stiffness values of the test local points in the X, Y and Z directions.

Description

technical field [0001] The invention relates to the field of mechanical performance detection of mechanical structures, in particular to a method and system for rapid testing of local static stiffness of mechanical structures. Background technique [0002] The static stiffness of the overall or local installation point of the mechanical structure is an important parameter to characterize the mechanical characteristics of the structure. Identifying and controlling this parameter is crucial to improving the engineering mechanical properties of the mechanical structure. In the field of mechanical / automotive engineering, the magnitude of structural stiffness directly reflects the robustness of the system and has a direct impact on the stress and strain under load. Insufficient static stiffness design and verification of the mechanical structure will bring great challenges to the durability and abnormal noise control of the structure and even the system. However, the traditional...

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Problems solved by technology

[0003] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a method and system for fast testing of local static stiffness of mechanical structures, so as to improve the problem of poor versatility in the testing of local stiffness of existing mechanical structures

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