Theoretical detection method for determining location of damaged fastener

Abstract

The invention relates to a theoretical detection method for determining the location of a damaged fastener. The theoretical detection method includes the steps that (1) a sensitive index limiting value is calculated, specifically, a modal superposition method is adopted, ordinary differential vibration equations of a steel rail and lining can be respectively obtained through orthogonal decomposition, the ordinary differential vibration equations are combined with a train body formula, single fastener damage is introduced, the fastener rigidity is 0 at the damaged fastener location x0, and vertical acceleration of a car body when a first wheel of the car body passes above the damaged location is the sensitive index limiting value and obtained; and (2) the damaged location is distinguished. The theoretical detection method has the beneficial effects that a subway integrated track bed train track coupling model is established, an integrated track bed (tunnel lining)-soil coupling analysis model is established based on a structure dynamics theory, sensitivity index car body vertical acceleration a and the condition that the damaged fastener rigidity is 0 are introduced, and the sensitive index limiting value is calculated. The theoretical detection method can be suitable for single fastener damage and multiple fastener damage conditions.

Description

technical field [0001] The invention relates to the technical field of underground engineering, more specifically, it relates to a theoretical detection method for determining the position of a damaged fastener. Background technique [0002] The rapid growth of urban population in recent years has brought enormous pressure to urban traffic. In order to alleviate the problem of ground traffic congestion, large and medium-sized cities in China have begun to vigorously develop underground rail transit. The subway has the advantages of large transportation capacity, fast and convenient, etc. However, due to various reasons such as the complex underground environment, the influence of surrounding engineering construction, and the long-term operation load of the subway, various subway safety issues have attracted more and more attention. Among them Including the problem of fastener damage. Fasteners, as components connecting rails and track slabs, tend to break and fall off duri...

AI Technical Summary

Problems solved by technology

[0009] To sum up, there are no research results on the position determination of damaged fasteners directly using the dynamic characteristics of the system.

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