本文關(guān)鍵詞： 聲振耦合 隔振降噪 自由阻尼 約束阻尼 低頻振動(dòng)　出處：《沈陽(yáng)工業(yè)大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：隨著人們生活的發(fā)展，水泵系統(tǒng)已經(jīng)成為人們生活中所必不可少的一部分。水泵系統(tǒng)運(yùn)轉(zhuǎn)時(shí)產(chǎn)生的振動(dòng)和噪音已經(jīng)成為人們生活中一種新的污染。尤其是隨著建筑結(jié)構(gòu)趨向于簡(jiǎn)潔化、輕薄化，將系統(tǒng)產(chǎn)生的振動(dòng)及噪音去除至達(dá)到人們的要求顯得越來(lái)越困難。本文引入并推導(dǎo)了聲振耦合理論，針對(duì)實(shí)踐中難以解決的低頻振動(dòng)與低頻噪聲問(wèn)題進(jìn)行分析，將聲振耦合理論應(yīng)用于供熱循環(huán)泵系統(tǒng)實(shí)際工況中，定性并定量地分析了振動(dòng)與聲場(chǎng)之間的相互影響。本文將聲振耦合效應(yīng)分兩方向進(jìn)行討論，即聲場(chǎng)環(huán)境對(duì)系統(tǒng)振動(dòng)特性的影響以及系統(tǒng)振動(dòng)對(duì)聲場(chǎng)分布情況的影響。此外，鑒于水泵管道系統(tǒng)振動(dòng)信號(hào)的復(fù)雜性，為了更準(zhǔn)確地從復(fù)雜復(fù)合信號(hào)中提取出水泵管道系統(tǒng)振動(dòng)信號(hào)，提出了基于噪聲輔助集合的門限自回歸模型延拓經(jīng)驗(yàn)?zāi)Ｊ椒纸馑惴?E-TAR-EMD)分析提取振動(dòng)特征，以便于進(jìn)一步的聲振耦合分析。 首先，應(yīng)用聲振耦合有限元理論推導(dǎo)并計(jì)算聲場(chǎng)對(duì)振動(dòng)模態(tài)的影響，使用有限元軟件Patran結(jié)合Virtual lab分析軟件仿真計(jì)算噪聲聲場(chǎng)環(huán)境對(duì)水泵常見(jiàn)管路的振動(dòng)模態(tài)的影響情況，并搭建模仿實(shí)際工況下的供熱循環(huán)泵系統(tǒng)的實(shí)驗(yàn)臺(tái)，以該實(shí)驗(yàn)臺(tái)運(yùn)轉(zhuǎn)情況為例進(jìn)行實(shí)驗(yàn)驗(yàn)證。理論分析與實(shí)驗(yàn)驗(yàn)證結(jié)果表明，噪聲聲場(chǎng)會(huì)對(duì)處于其中的管路的振動(dòng)模態(tài)有較大影響，引起振動(dòng)峰值頻率的偏移。在不同頻率下，由聲場(chǎng)附加載荷引起管路的附加位移相差很多。聲振強(qiáng)耦合頻率段主要集中在300Hz中頻段，這一點(diǎn)實(shí)際測(cè)量與理論推導(dǎo)基本相符，對(duì)改進(jìn)隔振措施有指導(dǎo)意義。 之后，本文以實(shí)際工程為背景，采用聲振耦合邊界元理論分析樓板振動(dòng)對(duì)通過(guò)樓板后的聲場(chǎng)的影響。針對(duì)實(shí)際工程中難以解決的噪聲通過(guò)樓板后在某些頻段存在非正常峰值的問(wèn)題進(jìn)行了分析與討論，并指出此問(wèn)題原因在于室內(nèi)聲場(chǎng)與機(jī)組運(yùn)行將振動(dòng)傳遞給樓板，而樓板振動(dòng)的同時(shí)輻射聲波與透過(guò)樓板的聲波產(chǎn)生疊加，從而影響了樓板的投射聲場(chǎng)分布。為準(zhǔn)確獲取樓板振動(dòng)信號(hào)用于進(jìn)一步分析，本文應(yīng)用基于噪聲輔助集合的門限自回歸模型延拓經(jīng)驗(yàn)?zāi)Ｊ椒纸馑惴?E-TAR-EMD)對(duì)采集到的復(fù)雜復(fù)合信號(hào)進(jìn)行提取，從而獲得了較準(zhǔn)確的樓板振動(dòng)特性。在此基礎(chǔ)上，分別計(jì)算樓板透射聲波與樓板振動(dòng)輻射聲波的傳遞規(guī)律與聲場(chǎng)分布情況，并將兩種聲波傳遞規(guī)律進(jìn)行疊加，，對(duì)聲場(chǎng)分布情況進(jìn)行耦合計(jì)算，得到不同頻段下測(cè)點(diǎn)附近的聲壓級(jí)云圖。將運(yùn)算結(jié)果與實(shí)際測(cè)量結(jié)果對(duì)比，符合程度良好，從而證明了樓板振動(dòng)對(duì)測(cè)點(diǎn)附近聲場(chǎng)的影響，解釋了某些頻段聲音難以消除的原因。 最后，針對(duì)實(shí)際工程中普遍存在的管道低頻振動(dòng)噪聲問(wèn)題，建立了數(shù)學(xué)模型，分析了傳統(tǒng)彈簧隔振措施不能夠完善解決管道低頻振動(dòng)噪聲問(wèn)題的原因，提出采用阻尼措施來(lái)吸收振動(dòng)能量，實(shí)現(xiàn)減振與降噪的方案。提出自由阻尼與約束阻尼兩種阻尼措施，在微觀角度分別推導(dǎo)了兩種阻尼措施的耗能機(jī)理與隔振效果，對(duì)兩種不同機(jī)理的阻尼措施進(jìn)行了參數(shù)化分析。在理論分析的基礎(chǔ)上，以阻尼變形量為目標(biāo)函數(shù)進(jìn)行了參數(shù)優(yōu)化實(shí)驗(yàn)驗(yàn)證。理論分析與實(shí)驗(yàn)驗(yàn)證結(jié)果表明，在同等條件下，約束阻尼措施的總體隔振效果要優(yōu)于自由阻尼措施，不同材料參數(shù)對(duì)隔振效果有較大影響，對(duì)今后的阻尼措施及其優(yōu)化具有重要的參考價(jià)值，對(duì)水泵系統(tǒng)振動(dòng)噪聲治理手段的發(fā)展具有重大意義。
[Abstract]:With the development of people's life, the water pump system has become a part of the indispensable to people's life. The noise and vibration caused by the operation of the water pump system has become a new pollution in people's lives. Especially with the building structure tend to be simple, lightweight, vibration and noise will be generated to reach people removal system the requirement is more and more difficult. This paper introduces and deduces the acoustic coupling theory, according to the analysis of low frequency vibration and noise problems are difficult to solve in practice, the acoustic coupling theory is applied to the actual working condition of heating circulating pump system, the relationship between vibration and sound field of the qualitative and quantitative analysis. This paper will sound vibration in two direction are discussed, the sound environmental impact on the vibration characteristics of the system and the influence of system vibration on the sound field distribution. In addition, in view of the pump pipe The complexity of vibration signal of the system, in order to accurately extract the signal from the complex vibration signals of pump pipeline system, put forward the noise assisted set threshold auto regression model based on extension of empirical mode decomposition (E-TAR-EMD) algorithm to extract the features of vibration analysis, in order to facilitate the acoustic coupling of further analysis.
First of all, influence of the application of acoustic coupling finite element theory and field calculation of vibration mode, influence the use of finite element software Patran combining with Virtual lab analysis and calculation of noise environment on the pump vibration mode of common pipeline simulation software, and set up the experimental platform to imitate the heating circulating pump system of actual working conditions, in the experiment Taiwan operation experiments were carried out as an example. Theoretical analysis and experimental results show that the noise will have great influence on the vibration mode in the pipeline, caused by vibration of the peak frequency offset. Under different frequencies, the additional displacement of the pipeline caused by sound additional loads a lot of difference. The acoustic vibration frequency is mainly concentrated in strong coupling in the 300Hz band, a practical measurement is consistent with the basic theory, guiding significance to the improvement of isolation measures.
After that, this paper takes the actual project as the background, using the coupled boundary element theory of sound and vibration analysis of influence of floor vibration through the floor after the noise in the sound field. It is difficult to solve in practical engineering through the floor after the non normal peak problem in certain frequency band are analyzed and discussed, and pointed out that the cause of this issue lies in the operating room sound field with the unit to transmit the vibration to the floor, and the floor vibration and radiation of acoustic waves and sound waves through the floor of the stack, thus affecting the projection field distribution. In order to obtain the floor slab vibration signal for further analysis, the application of noise assisted set threshold auto regression model based on extension of empirical mode decomposition algorithm (E-TAR-EMD) complex of the collected signals were extracted to obtain the floor vibration characteristics accurately. On this basis, calculate the acoustic transmission and the floor Transfer law and sound field distribution of acoustic radiation floor vibration, and two kinds of acoustic transmission rules were superimposed, coupling calculation on acoustic field distribution, obtained under different frequency bands measured sound pressure level near the point cloud. The operation results and actual measurement results, good agreement, which proves the influence of floor vibration measuring points near field, explains why some band sound difficult to eliminate.
Finally, aiming at the pipeline exists in practical engineering of low frequency vibration noise problem, a mathematical model is established, the analysis of the traditional spring vibration isolation measures can not improve the reason and solve the problems of vibration and noise of pipeline frequency, the damping measures to absorb vibration energy, reduce vibration and noise reduction scheme. Put forward two kinds of free damping and constrained damping the damping measures in microcosmic angle are deduced the energy dissipation mechanism of two kinds of damping measures and the effect of vibration isolation, damping mechanism of two different measures of parametric analysis. On the basis of theoretical analysis, the deformation of the damping parameter optimization experiment for the objective function. The theoretical analysis and experimental results show that the and under the same conditions, the overall measure of constrained damping vibration isolation effect is better than that of free damping measures, different material parameters have great influence on the effect of vibration isolation, damping for the future The measures and its optimization have important reference value, and it is of great significance to the development of the vibration and noise control methods of the pump system.

【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH38

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 鄒元杰,趙德有;水下結(jié)構(gòu)聲固耦合振動(dòng)的特征值計(jì)算[J];船舶力學(xué);2004年02期

2 程耿東，張東旭;受應(yīng)力約束的平面彈性體的拓?fù)鋬?yōu)化[J];大連理工大學(xué)學(xué)報(bào);1995年01期

3 范成高;陳南;張肅;;基于改進(jìn)Trefftz解析法的封閉空腔噪聲有源控制[J];動(dòng)力學(xué)與控制學(xué)報(bào);2006年04期

4 李以農(nóng);謝熔爐;王宜;鄭玲;;約束阻尼結(jié)構(gòu)拓?fù)鋬?yōu)化設(shè)計(jì)的進(jìn)化算法[J];重慶大學(xué)學(xué)報(bào);2010年08期

5 余愛(ài)萍,張重超,駱振黃;瞬態(tài)聲振耦合問(wèn)題的邊界元分析及實(shí)驗(yàn)研究[J];固體力學(xué)學(xué)報(bào);1991年01期

6 彭旭;關(guān)珊珊;駱東平;陳美霞;;內(nèi)部聲激勵(lì)下加筋圓柱殼的聲輻射特性分析[J];固體力學(xué)學(xué)報(bào);2007年04期

7 辛鋒先;;復(fù)雜板殼結(jié)構(gòu)聲振耦合特性的理論與實(shí)驗(yàn)研究[J];固體力學(xué)學(xué)報(bào);2012年03期

8 陳明;曹為午;陳美霞;金寶燕;;內(nèi)部聲源激勵(lì)加筋雙層圓柱殼聲振計(jì)算方法[J];華中科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年09期

9 陳美霞;和衛(wèi)平;邱昌林;陳清坤;;力激勵(lì)與聲激勵(lì)作用下圓柱殼聲振性能試驗(yàn)[J];華中科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年03期

10 呂毅寧;呂振華;趙波;王超;;附加自由阻尼結(jié)構(gòu)系統(tǒng)的有限元分析和拓?fù)鋬?yōu)化設(shè)計(jì)方法研究[J];計(jì)算力學(xué)學(xué)報(bào);2012年02期

相關(guān)博士學(xué)位論文 前2條

1 李鴻秋;板/殼—腔結(jié)構(gòu)聲振耦合分析及減振降噪優(yōu)化研究[D];南京航空航天大學(xué);2011年

2 李艷華;考慮流固耦合的管路系統(tǒng)振動(dòng)噪聲及特性研究[D];哈爾濱工程大學(xué);2011年

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