【摘要】：在建立基于聲發(fā)射技術(shù)的裂紋產(chǎn)生與拓展檢測系統(tǒng)的基礎(chǔ)上。以薄鋼板為實驗對象,研究了Lamb波在薄板中傳播的頻散及多模態(tài)特性,并結(jié)合morlet小波時頻聯(lián)合分析方法,提出了一種針對聲發(fā)射信號在薄板中傳播時產(chǎn)生的不同模態(tài)進(jìn)行識別的方法。通過提取不同模態(tài)波到達(dá)同一傳感器的時間差并依據(jù)不同模態(tài)波對應(yīng)的波速實現(xiàn)對出現(xiàn)裂紋的位置進(jìn)行定位。經(jīng)過實驗研究表明,運(yùn)用該方法不僅能準(zhǔn)確地識別A0、S0模態(tài)波并實現(xiàn)對聲發(fā)射源進(jìn)行精確定位。
[Abstract]:Based on acoustic emission technology, the crack generation and expansion detection system is established. The dispersion and multimodal characteristics of Lamb waves propagating in thin plates are studied, and the morlet wavelet time-frequency joint analysis method is combined. This paper presents a method for identifying different modes of acoustic emission signals propagating in thin plates. By extracting the time difference between different mode waves to the same sensor and according to the wave velocity corresponding to different mode waves, the location of the crack is located. The experimental results show that the proposed method can not only accurately identify the A0 / S0 mode waves but also accurately locate the acoustic emission sources.
【作者單位】： 內(nèi)蒙古科技大學(xué)機(jī)械工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51565047) 內(nèi)蒙古自治區(qū)自然科學(xué)基金項目(2015BS0511) 內(nèi)蒙古自治區(qū)高等學(xué)�？茖W(xué)研究項目(NJZY154)
【分類號】：TG142.15
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本文編號：2395519