Safety assessment method for heavy load structure of heavy type construction machine

Abstract

The invention relates to a safety assessment method for a heavy load structure of a heavy type construction machine. The safety assessment method includes the concrete steps that modal shape vectors and stiffness matrixes are used for determining corresponding structural element modal strain energy and corresponding overall structure modal strain energy, wherein the modal shape vectors and the stiffness matrixes are generated before and after structural damage; element modal strain energy ratios before and after structural damage is determined by adopting the ratio of the element modal strain energy to the overall structure modal strain energy; the strain energy damage tolerance ratio degree DESR ij is determined through the ratio of element modal strain energy before structural damage to element modal strain energy after structural damage. When the modal strain energy damage tolerance ratio degree DESR ij approaches zero, it shows that the j element is not damaged, and the larger the modal strain energy damage tolerance ratio degree DESR ij is, the more serious the damage of the j element is damaged. According to the method, the modal strain energy damage tolerance ratio degrees of all the elements are sequentially calculated so that the positions and the degrees of structural damage can be obtained. Existence of structural damage of the heavy load structure of the heavy type construction machine and the positions of structural damage can be fast and accurately recognized, and the problem that structural damage of the heavy load structure of the heavy type construction machine is not prone to being recognized is solved.

Description

technical field [0001] The invention relates to the technical field of heavy machinery damage fault diagnosis, in particular to a safety assessment method for heavy-duty structures of heavy construction machinery. Background technique [0002] The heavy-duty structure of heavy-duty construction machinery has become an indispensable special engineering construction equipment for large-scale infrastructure construction such as subway engineering, railway construction, and bridge construction due to its efficient operation advantages. Or affected by impact loads and sudden factors, they often suffer from various damages. In addition, the initial small crack damage is not easy to be found. With the gradual accumulation of small damage, serious major construction accidents are prone to occur. Once an accident occurs, it will bring huge losses or even catastrophic consequences to the quality of the project, the progress of the project, and even people's lives and property. Theref...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a safety analysis method for the heavy-duty structure of heavy-duty construction machinery, which can quickly identify the location and degree of damage to the heavy-duty structure of heavy-duty construction machinery, so as to solve the problem of damage to the heavy-duty structure of heavy-duty construction machinery. Problems that are not easy to identify, thus providing an accurate basis for "condition-based maintenance" of heavy construction equipment

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