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1、哈爾濱工業(yè)大學(xué)工程碩士論文workwillproducemanybubbles,andtheseawateritselfisalsodifferentfrompurewater.Inthelightofthisspecialenvironment,theinfluenceofseawater,suspendedparticlesandbubblesonsoundpropagationisanalyzed.Keywords:ultrasonicphasedarray,weldseamrecogniti
2、on,spread-spectrumranging,suspendedparticles,bubbles-III-哈爾濱工業(yè)大學(xué)工程碩士學(xué)位論文目錄摘要..........................................................................................................................IABSTRACT.............................................
3、...................................................................II第1章緒論...........................................................................................................11.1課題的來源、背景及意義........................................................
4、.................11.2國內(nèi)外研究現(xiàn)狀........................................................................................31.2.1水下焊接機器人的發(fā)展現(xiàn)狀及趨勢........................................................31.2.2超聲傳感焊縫識別與跟蹤國內(nèi)外研究現(xiàn)狀...................................
5、.........41.2.3目前常用的超聲測距算法........................................................................51.3本課題主要研究內(nèi)容................................................................................6第2章超聲相控陣的波束形成原理.............................................
6、..........................82.1超聲相控陣的發(fā)射與接收.........................................................................82.2超聲相控陣延遲時間的計算.....................................................................82.2.1聚焦延遲時間.........................................
7、...................................................82.2.2偏轉(zhuǎn)聚焦延遲時間....................................................................................92.3超聲相控陣發(fā)射聲場的計算和仿真.........................................................112.3.1固體、液體介質(zhì)中的波動方程.......
8、.......................................................112.3.2聲束在界面處的透射和反射..................................................................132.3.3瑞利積分法計算發(fā)射聲場......................................................................142.3.4相
