【摘要】：軸對(duì)稱載荷是管道中軸對(duì)稱模態(tài)導(dǎo)波激勵(lì)的有效方法。然而,受換能器安裝誤差等因素的影響,激勵(lì)載荷多會(huì)變?yōu)榉禽S對(duì)稱載荷,進(jìn)而使激勵(lì)出的導(dǎo)波模態(tài)變得復(fù)雜。對(duì)非軸對(duì)稱多元載荷條件下縱向模態(tài)導(dǎo)波的激勵(lì)問題進(jìn)行了深入研究�？紤]兩種典型的非軸對(duì)稱載荷,采用簡(jiǎn)正模態(tài)展開技術(shù),建立了導(dǎo)波激勵(lì)聲場(chǎng)與邊界載荷的量化關(guān)系,進(jìn)而分析了各模態(tài)導(dǎo)波的產(chǎn)生機(jī)理及載荷陣列對(duì)縱向?qū)Р?lì)的影響。采用有限元數(shù)值模擬驗(yàn)證了理論預(yù)測(cè)結(jié)果�？紤]實(shí)際管道檢測(cè)中出現(xiàn)的非軸對(duì)稱載荷,提出了一種載荷補(bǔ)償策略并進(jìn)行了實(shí)驗(yàn)驗(yàn)證。結(jié)果表明,該方法能夠有效抑制彎曲模態(tài)導(dǎo)波的產(chǎn)生,同時(shí)也有助于改善導(dǎo)波信號(hào)的噪聲水平。
[Abstract]:Axisymmetric load is an effective method for axisymmetric modal guided wave excitation in pipeline. However, under the influence of the transducer installation error, the excitation load will be changed into non-axisymmetric load, which makes the guided wave mode complicated. The excitation problem of longitudinal mode guided waves under non-axisymmetric multivariate loads is studied. Considering two kinds of typical non-axisymmetric loads, the quantitative relationship between guided wave excitation sound field and boundary load is established by using normal mode expansion technique, and the generation mechanism of guided wave and the effect of load array on longitudinal guided wave excitation are analyzed. The finite element numerical simulation is used to verify the theoretical prediction results. Considering the non-axisymmetric loads in actual pipeline detection, a load compensation strategy is proposed and verified by experiments. The results show that the proposed method can effectively suppress the generation of guided waves in the bending mode and improve the noise level of the guided wave signals.
【作者單位】： 大連理工大學(xué)工業(yè)裝備結(jié)構(gòu)分析國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家科技重大專項(xiàng)(2008ZX05026) 國(guó)家自然科學(xué)基金(91016024) 教育部新世紀(jì)人才(NCET-11-0055) 中央高�；究蒲袠I(yè)務(wù)費(fèi)(DUT12LK33)
【分類號(hào)】：TG115.285

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

1 吳斌,王智,金山,焦敬品,何存富;用于激勵(lì)超聲導(dǎo)波的任意波形發(fā)生器[J];北京工業(yè)大學(xué)學(xué)報(bào);2002年04期

2 吳斌,鄭t熻，

本文編號(hào)：2379895