Theoretical detection method for determining location of damaged fastener

A detection method and fastener technology, which are used in railway car body parts, railway vehicle shape measuring instruments, railway auxiliary equipment, etc.

Active Publication Date: 2019-09-17
ZHEJIANG UNIV CITY COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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[0009] To sum up, there are no research results on the position determination

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  • Theoretical detection method for determining location of damaged fastener
  • Theoretical detection method for determining location of damaged fastener
  • Theoretical detection method for determining location of damaged fastener

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Embodiment Construction

[0091] The present invention will be further described below in conjunction with the examples. The description of the following examples is provided only to aid the understanding of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0092] Based on the theory of structural dynamics, a coupling analysis model of subway train-integral track bed (tunnel lining)-soil was established, and the sensitive index car body vertical acceleration a and the stiffness of damaged fasteners were introduced to calculate the sensitive index limit.

[0093] Using the difference between the two sensitive index curves before and after the inspection vehicle, the specific position of a single damaged fastener and t...

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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...

Claims

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Application Information

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IPC IPC(8): B61K9/08
CPCB61K9/08
Inventor 蒋吉清董北北苏鑫杰章亦然张鑫海蔡泽甬
Owner ZHEJIANG UNIV CITY COLLEGE
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