Modeling analysis method for a pipeline heterogeneous interface ultrasonic guided wave propagation rule

A heterogeneous interface, ultrasonic guided wave technology, applied in special data processing applications, instruments, electrical digital data processing and other directions, can solve the lack of ultrasonic guided wave propagation mechanism and other problems, achieve good applicability and stability, improve efficiency and The effect of precision

Pending Publication Date: 2019-05-31
BEIJING INST OF ASTRONAUTICAL SYST ENG +1
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Problems solved by technology

[0004] It can be seen that in the prior art, the traditional ultrasonic guided wave propagation mechanism and numerical simulation research have carried out theoretical research and experimental verifica

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Embodiment Construction

[0034] The present invention relates to a method for modeling and analyzing the law of propagation of ultrasonic guided waves at heterogeneous interfaces in pipelines. The pipelines include straight pipes and heterogeneous interfaces. The method includes the following steps:

[0035] Step 1. Establishing the dynamic display finite element simulation model of the pipeline heterogeneous interface: when establishing the display finite element simulation model, respectively establish the straight pipe display finite element simulation model and the heterogeneous interface display finite element simulation model, and assign different The material properties of the material, and then use the Merge function to merge the two simulation models or establish a Tie constraint on the heterogeneous interface to bind the heterogeneous interface with the straight pipe interface;

[0036] Step 2. Obtain the reflection characteristic waveform of the ultrasonic guided wave at the heterogeneous in...

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Abstract

The invention provides a pipeline heterogeneous interface ultrasonic guided wave propagation rule modeling analysis method, a pipeline comprises a straight pipe and a heterogeneous interface, and themethod comprises the following steps: step 1, establishing a pipeline heterogeneous interface dynamic display finite element simulation model; and step 2, obtaining a reflection characteristic waveform of the ultrasonic guided wave at the heterogeneous interface so as to remove the influence of the reflection characteristic waveform on the pipeline damage characteristic waveform. According to theanalysis method, a finite element simulation model of the pipeline heterogeneous interface is established, a dispersion equation and a mode conversion relation of ultrasonic guided waves propagating in the pipeline heterogeneous interface are derived, and a reflection characteristic waveform of the ultrasonic guided waves at the heterogeneous interface is obtained, so that the influence of the reflection characteristic waveform on the pipeline damage characteristic waveform is removed.

Description

technical field [0001] The invention relates to a method for modeling and analyzing the propagation law of ultrasonic guided waves at heterogeneous interfaces of pipelines, in particular to the propagation laws of ultrasonic guided waves at heterogeneous interfaces of pipelines in aerospace vehicles, and belongs to the field of analysis and modeling of heterogeneous interfaces of pipelines. Background technique [0002] The pipeline system is a key subsystem in the aerospace vehicle, which is used to transfer the propellant from the storage tank to the engine at a certain pressure and flow rate, and to ensure that the propellant is not mixed with gas. The piping system in aerospace vehicles has the characteristics of long-distance transmission and thin pipe walls. Due to the influence of structures such as welds, compensators, brackets, and flanges, damage detection of piping systems is difficult. With the development of my country's aerospace technology, especially the deve...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 孙海亮武园浩廖传军陆浩然陈海鹏周浩洋贺启林崔景芝欧阳芙常晓华范书群吴晗玲李强于秀丽
Owner BEIJING INST OF ASTRONAUTICAL SYST ENG
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