【摘要】：單端激勵(lì)與接收方式的超聲導(dǎo)波管道檢測(cè)信號(hào),經(jīng)過管道中缺陷處和管道端頭時(shí)會(huì)產(chǎn)生多次來回反射和透射,直到信號(hào)功率流耗盡為止,這種多次來回反射和透射過程導(dǎo)致了超聲導(dǎo)波偽缺陷信號(hào)的出現(xiàn),而偽缺陷信號(hào)的存在嚴(yán)重影響了對(duì)管道檢測(cè)中缺陷數(shù)量和位置的判別.針對(duì)偽缺陷信號(hào)識(shí)別難點(diǎn)問題,繪制超聲導(dǎo)波在管道中傳播路徑示意圖,歸納總結(jié)出超聲導(dǎo)波檢測(cè)偽缺陷信號(hào)出現(xiàn)的位置特征規(guī)律,即:第1個(gè)反射周期檢測(cè)信號(hào)中不會(huì)出現(xiàn)偽缺陷信號(hào)或其信號(hào)幅值很小可忽略,較大幅值的偽缺陷信號(hào)從第2個(gè)反射周期檢測(cè)信號(hào)開始出現(xiàn)并與真實(shí)缺陷信號(hào)關(guān)于該周期內(nèi)檢測(cè)信號(hào)的時(shí)域中點(diǎn)對(duì)稱,并采用數(shù)值模擬方法和實(shí)驗(yàn)檢測(cè)驗(yàn)證了該規(guī)律的正確性.依據(jù)偽缺陷信號(hào)出現(xiàn)的特征規(guī)律,對(duì)超聲導(dǎo)波管道檢測(cè)信號(hào)中缺陷波包信號(hào)進(jìn)行識(shí)別和提取,并利用匹配追蹤方法和數(shù)值比對(duì)賦值法對(duì)偽缺陷信號(hào)進(jìn)行消除.研究結(jié)果表明:提出的超聲導(dǎo)波管道檢測(cè)偽缺陷識(shí)別及其消除方法行之有效,實(shí)現(xiàn)了超聲導(dǎo)波檢測(cè)缺陷信號(hào)去偽成真目的,解決了超聲導(dǎo)波檢測(cè)信號(hào)識(shí)別難點(diǎn)問題,極大促進(jìn)了超聲導(dǎo)波無損檢測(cè)技術(shù)的工程應(yīng)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(xué)動(dòng)力工程學(xué)院;
【基金】：國家部委預(yù)研基金(編號(hào):9140A27020115JB11001)資助項(xiàng)目
【分類號(hào)】：TB553

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