Method for quantitative identification of combined state of explosive composite pipe
A technology that combines state and quantitative identification. It is used in measuring devices, using sonic/ultrasonic/infrasonic waves to analyze solids, and using sonic/ultrasonic/infrasonic waves for material analysis. It can solve problems such as high cost, low efficiency, and inability to online quantitative detection. , to achieve the effect of low cost and strong real-time performance
Active Publication Date: 2018-12-07
XIAN UNIV OF TECH
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Problems solved by technology
[0004] The purpose of the present invention is to provide a method for quantitative identification of the bonding state of explosive composite pipes, which solves the problems of high cost, low efficiency and inability to perform online quantitative detection in existing detection methods
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[0079] The specific implementation is as follows:
[0080] Design and manufacture a group of composite pipes with different bonding states. This type of pipe is composed of a carbon steel outer pipe and a stainless steel inner pipe. 1# pipe is a standard pipe with good bonding state, and 2#, 3# and 4# are respectively slightly damaged , small damage and poorly combined composite pipe with large damage. The specific parameters of the four kinds of pipes are shown in Table 1. It can be seen from the table that all the pipes are obtained by coaxial assembly of the base pipe and the liner with the same material, the same outer diameter, the same wall thickness and the same length.
[0081] Table 1 Basic size parameters of composite pipes
[0082]
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The invention discloses a method for quantitative identification of a combined state of an explosive composite pipe. Firstly, an impulse excitation is applied to one end of the composite pipe througha force hammer, and an acceleration sensor is used to collect vibration response signal x at the other end of the composite pipe. Then, a scale function and a wavelet function of empirical wavelet transform are constructed according to the characteristics of the collected vibration response signal x, and are used for modal separation of the vibration response signal. Secondly, effective mode signals are determined from separated single-frequency mode signals, the energy ratio of highest order mode signal Hilbert envelope to lowest order mode signal Hilbert envelope is calculated as a detectionindex. Finally, the combined state of the composite pipe is identified according to the detection index. The method has the characteristics such as simplicity, reliability, easy operation, low cost and strong real-time performance, is suitable for on-site quantitative identification of pipeline states, realizes on-line non-destructive quantitative identification of the combined state of the explosive composite pipe, and has important engineering practical value.
Description
technical field [0001] The invention belongs to the technical field of mechanical structure health state detection, and relates to a method for quantitatively identifying the bonding state of explosive composite pipes. Background technique [0002] The explosive composite pipe uses the huge energy and shock waves generated by the explosion of explosives to make the liner and the base pipe collide at high speed, and uses the relative deformation of the liner and the base pipe to make them bond with each other, and there is no metallurgical bonding interface between the liner and the base pipe , the combination of the liner and the base pipe is mainly maintained by the radial residual stress between the base pipe and the liner. The quality of the bonding state of the composite pipe directly affects its application in engineering. The bonding state of the explosive composite pipe is not good, and defects such as wrinkles, bulging, separation, and peeling will appear during the ...
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CPCG01N29/045
Inventor 思悦李淑娟孔令飞杨癸庚元振毅汤奥斐李言
Owner XIAN UNIV OF TECH
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