發(fā)布時(shí)間：2018-12-18 15:52

【摘要】：近幾年興起的激光超聲檢測(cè)技術(shù),在對(duì)微裂紋檢測(cè)方面以其非接觸、寬頻帶等優(yōu)點(diǎn)受到廣泛關(guān)注,取得一定進(jìn)展,但是目前并沒有統(tǒng)一的理論解釋裂紋和超聲信號(hào)作用機(jī)理。從能量角度分析研究發(fā)現(xiàn),裂紋的存在會(huì)消耗超聲波的能量,造成能量衰減,同時(shí)理論計(jì)算與實(shí)際值之間存在比例系數(shù)。通過能量衰減計(jì)算公式,設(shè)計(jì)并進(jìn)行實(shí)驗(yàn),利用波形幅值的平方近似代替波形能量,通過兩者對(duì)比,對(duì)比例系數(shù)進(jìn)行擬合,然后計(jì)算出未知裂紋深度的比例系數(shù),并由此反推預(yù)判未知深度裂紋對(duì)應(yīng)的能量衰減值,實(shí)現(xiàn)對(duì)裂紋定量檢測(cè)的目的。
[Abstract]:In recent years, the laser ultrasonic detection technology has been paid more and more attention for its advantages of non-contact and broadband, but there is no unified theory to explain the mechanism of crack and ultrasonic signal. From the point of view of energy analysis, it is found that the existence of crack will consume the energy of ultrasonic wave, resulting in energy attenuation. At the same time, there is a proportional coefficient between the theoretical calculation and the actual value. The formula of energy attenuation is used to design and carry out experiments. The square approximation of waveform amplitude is used to replace the wave energy. Through the comparison of the two, the proportional coefficient is fitted, and then the proportional coefficient of unknown crack depth is calculated. The energy attenuation corresponding to the crack with unknown depth is predicted and the purpose of quantitative crack detection is achieved.
【作者單位】： 中北大學(xué)機(jī)電工程學(xué)院;中北大學(xué)計(jì)算機(jī)與控制工程學(xué)院;電子測(cè)量技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：教育部博士點(diǎn)基金聯(lián)合資助項(xiàng)目(項(xiàng)目編號(hào):2013142012007)
【分類號(hào)】：TN249

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