Method for quantified monitoring bolt pre-tightening torque through active ultrasonic guided wave

A technology of bolt pre-tightening force and ultrasonic guided wave, which is used to measure torque/torsion force and other directions during tightening, can solve problems such as insufficient wave energy, failure to establish, and divergence of excitation energy, achieve high quantitative monitoring accuracy, and reduce assembly Cost, efficiency improvement effect

Inactive Publication Date: 2015-12-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former requires large-scale equipment support, and may need to disassemble the structure, which is not suitable for real-time online monitoring; the latter needs to lead the bolt holes or change the structure of the joint, which is difficult to apply in practice
[0004] In recent years, the damage monitoring method using the ultrasonic guided wave method has been applied to the damage monitoring of structures such as single-material pipes and flat plates, but there are few researches on bo

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  • Method for quantified monitoring bolt pre-tightening torque through active ultrasonic guided wave
  • Method for quantified monitoring bolt pre-tightening torque through active ultrasonic guided wave
  • Method for quantified monitoring bolt pre-tightening torque through active ultrasonic guided wave

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Embodiment Construction

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0033] In describing the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than ...

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Abstract

The invention discloses a method for quantified monitoring bolt pre-tightening torque through active ultrasonic guided wave. MFC (Macro-Fiber Composite) material elements serve as an exciter and a sensor to conduct directional excitation, acquire fluctuation response and establish a bolt pre-tightening torque reference and comparison database. In this way, on-line monitoring bolt pre-tightening torque based on the reference database is carried out. The tightness of a bolt can be rapidly monitored without disassembling a structure, the assembling cost is reduced, and the efficiency is improved. The method is simple in operation, and quantified monitoring precision for single-bolt torque value is relatively high. The MFC material elements are thin (about 0.2mm), and may not affect structure performance after being pasted.

Description

technical field [0001] The invention relates to the technical field of structural health monitoring, in particular to a method for quantitatively monitoring bolt pretightening torque by using active ultrasonic guided waves. Background technique [0002] Bolted connections are widespread in the fields of mechanical, civil, energy and aerospace engineering. Controlling and maintaining the bolt preload is an important prerequisite to ensure the safe service of engineering structures. However, the stress relaxation of bolts during long-term service, as well as mechanical environments such as external vibration and impact may lead to a decrease in bolt preload and loose connections, which seriously endanger the safety of the structure. [0003] At present, the monitoring methods of bolt pretension in engineering are conventional non-destructive monitoring methods, such as the use of ultrasonic imaging, X-ray flaw detection and other methods; the other method is to fix strain gau...

Claims

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Application Information

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IPC IPC(8): G01L5/24
Inventor 王腾徐超吴冠男
Owner NORTHWESTERN POLYTECHNICAL UNIV
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