24頁(yè)共計(jì)7582字
摘要
高速列車(chē)進(jìn)入隧道產(chǎn)生的壓縮波傳播到遂道出口時(shí)，會(huì)向出口外輻射一低頻脈沖波，這種脈沖波產(chǎn)生的爆炸聲可達(dá)140~150dB甚至更高的聲壓級(jí)，對(duì)周邊環(huán)境造成嚴(yán)重危害，這種低頻脈沖波被稱(chēng)為“微氣壓波”。本文以聲波方程為基礎(chǔ)，根據(jù)無(wú)擾動(dòng)邊界假設(shè)，對(duì)高速列車(chē)在隧道內(nèi)產(chǎn)生的壓縮波進(jìn)行計(jì)算，根據(jù)理論結(jié)果作了數(shù)值模擬，通過(guò)與文獻(xiàn)中理論和數(shù)值模擬結(jié)果的對(duì)比，顯示出了很好的一致性。在此基礎(chǔ)上，根據(jù)微氣壓波與壓縮波的梯度成正比的性質(zhì)，提出兩種有源控制方法，并對(duì)間接控制方法作了理論分析和數(shù)值模擬，結(jié)果顯示了有源控制的可行性和高效性。對(duì)于直接控制方法，提出了控制要點(diǎn)和實(shí)現(xiàn)方法。最后設(shè)計(jì)了微壓波產(chǎn)生、觀測(cè)和有源控制實(shí)驗(yàn)。
目錄
摘要 i
Abstract ii
第一章 引言 1
1.1微壓波的產(chǎn)生 1
1.2現(xiàn)有理論和研究單位概述 1
1.3現(xiàn)有控制方法概述 3
1.4本文工作內(nèi)容 4
第二章 理論推導(dǎo)和數(shù)值模擬 6
2.1初級(jí)聲場(chǎng)的計(jì)算 6
2.2數(shù)值模擬 10
2.3討論 11
第三章 微壓波有源控制 12
3.1有源控制的引入 12
3.2數(shù)值模擬 13
3.3實(shí)驗(yàn)設(shè)計(jì) 14
第四章 結(jié)束語(yǔ) 17
參考文獻(xiàn) 18
致謝 20

關(guān)鍵字：高速列車(chē)，微壓波
參考文獻(xiàn)
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