發(fā)布時間：2018-08-07 07:54

【摘要】：單端激勵與接收方式的超聲導波管道檢測信號,經(jīng)過管道中缺陷處和管道端頭時會產(chǎn)生多次來回反射和透射,直到信號功率流耗盡為止,這種多次來回反射和透射過程導致了超聲導波偽缺陷信號的出現(xiàn),而偽缺陷信號的存在嚴重影響了對管道檢測中缺陷數(shù)量和位置的判別.針對偽缺陷信號識別難點問題,繪制超聲導波在管道中傳播路徑示意圖,歸納總結出超聲導波檢測偽缺陷信號出現(xiàn)的位置特征規(guī)律,即:第1個反射周期檢測信號中不會出現(xiàn)偽缺陷信號或其信號幅值很小可忽略,較大幅值的偽缺陷信號從第2個反射周期檢測信號開始出現(xiàn)并與真實缺陷信號關于該周期內(nèi)檢測信號的時域中點對稱,并采用數(shù)值模擬方法和實驗檢測驗證了該規(guī)律的正確性.依據(jù)偽缺陷信號出現(xiàn)的特征規(guī)律,對超聲導波管道檢測信號中缺陷波包信號進行識別和提取,并利用匹配追蹤方法和數(shù)值比對賦值法對偽缺陷信號進行消除.研究結果表明:提出的超聲導波管道檢測偽缺陷識別及其消除方法行之有效,實現(xiàn)了超聲導波檢測缺陷信號去偽成真目的,解決了超聲導波檢測信號識別難點問題,極大促進了超聲導波無損檢測技術的工程應用.
[Abstract]:Single end excitation and receiving mode of ultrasonic guided wave pipeline detection signal, passing through the defects in the pipeline and the end of the pipeline will produce multiple back and forth reflection and transmission, until the signal power flow is exhausted. This process of multiple back and forth reflection and transmission leads to the appearance of false defect signal of ultrasonic guided wave, and the existence of false defect signal seriously affects the determination of the number and location of defects in pipeline detection. Aiming at the difficult problem of identification of false defect signal, the schematic map of ultrasonic guided wave propagation path in pipeline is drawn, and the position characteristic law of ultrasonic guided wave detection false defect signal is summarized. That is, no pseudo-defect signal or its signal amplitude can be ignored in the first reflection period detection signal. The pseudo-defect signal with large amplitude appears from the second reflection period and is symmetrical with the real defect signal about the detection signal in the time domain. The correctness of the law is verified by numerical simulation and experimental detection. According to the characteristic rule of false defect signal, the defect wave packet signal in ultrasonic guided wave pipeline detection signal is identified and extracted, and the pseudo-defect signal is eliminated by matching tracing method and numerical comparison assignment method. The results show that the proposed method for detecting false defects in ultrasonic guided wave pipeline is effective, which realizes the true purpose of ultrasonic guided wave detection of defect signal, and solves the difficult problem of ultrasonic guided wave detection signal identification. It greatly promotes the engineering application of ultrasonic guided wave nondestructive testing technology.
【作者單位】： 海軍工程大學動力工程學院;
【基金】：國家部委預研基金(編號:9140A27020115JB11001)資助項目
【分類號】：TB553

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