【摘要】：水下航行器在許多國(guó)家得到越來(lái)越普遍的運(yùn)用。它不僅能夠完成對(duì)敵人軍艦或潛艇的偵查和攻擊，而且還能用于海洋科學(xué)的研究、勘探和科學(xué)偵測(cè)。然而隨著現(xiàn)代科學(xué)技術(shù)的高度發(fā)展，水下航行器的開(kāi)發(fā)和優(yōu)化得到了各個(gè)國(guó)家越來(lái)越高的重視。特別是在軍事方面，水下航行器的隱蔽性是其發(fā)揮自身作戰(zhàn)功能的最重要條件。因此如何降低水下航行器的振動(dòng)和噪聲一直是國(guó)內(nèi)外學(xué)者關(guān)注和研究的熱點(diǎn)問(wèn)題。而作為水下航行器的主要噪聲來(lái)源的結(jié)構(gòu)噪聲，也就成為了大多數(shù)學(xué)者研究的重點(diǎn)問(wèn)題。結(jié)構(gòu)噪聲是水下航行器的動(dòng)力裝置運(yùn)行時(shí)所產(chǎn)生不平衡力或者力矩所引起的，所以對(duì)于外激勵(lì)對(duì)水下航行器聲振特性影響的研究有著十分重要的意義。 本文針對(duì)不同類型的激勵(lì)對(duì)所建立模型的聲振特性的影響規(guī)律做了研究。首先建立一個(gè)錐-柱結(jié)合的殼體模型，運(yùn)用極限假設(shè)和傳遞矩陣的方法得到整個(gè)模型的振動(dòng)方程。利用MATLAB軟件計(jì)算得到模型的模態(tài)頻率，將所得數(shù)值計(jì)算結(jié)果與有限元仿真計(jì)算結(jié)果做了比較，驗(yàn)證了所用方法的正確性。隨后將激勵(lì)力或力矩進(jìn)行模態(tài)分解后施加在模型上，嘗試推導(dǎo)了模型在有激勵(lì)情況下的振動(dòng)方程和輻射聲功率。最后在有限元軟件ANSYS中分別建立軸對(duì)稱圓柱殼體的有限元模型和非軸對(duì)稱橢圓柱殼體的有限元模型，在SYSNOISE中計(jì)算分析了不同類型的激勵(lì)對(duì)模型聲振特性的影響規(guī)律、模型的部分結(jié)構(gòu)參數(shù)和激勵(lì)的位置對(duì)模型聲振特性的影響規(guī)律。研究結(jié)果發(fā)現(xiàn)：軸向力矩激勵(lì)對(duì)模型聲振特性的影響起主要作用；模型的殼體厚度增加可以有效的降低外激勵(lì)對(duì)模型聲振特性的影響；軸對(duì)稱模型柱殼段內(nèi)環(huán)肋數(shù)目的增加和非軸對(duì)稱模型柱殼截面橢圓度的變化對(duì)模型聲振特性的影響都較為復(fù)雜；激勵(lì)點(diǎn)在中間位置時(shí)的聲輻射功率比激勵(lì)點(diǎn)靠近模型兩側(cè)位置時(shí)的聲輻射功率要高。 本文旨在揭示不同類型的激勵(lì)對(duì)殼體模型聲振特性的影響規(guī)律，為水下航行器的結(jié)構(gòu)設(shè)計(jì)和動(dòng)力裝置的布置提供一定參考，，進(jìn)而可以為其減振降噪提供依據(jù)和指導(dǎo)。
[Abstract]:Underwater vehicles are more and more widely used in many countries. It can not only detect and attack enemy warships or submarines, but also be used in marine science research, exploration and scientific detection. However, with the development of modern science and technology, the development and optimization of underwater vehicle has been paid more and more attention by many countries. Especially in military aspect, the concealment of underwater vehicle is the most important condition for it to play its own combat function. Therefore, how to reduce the vibration and noise of underwater vehicle has been the focus of attention and research at home and abroad. As the main source of underwater vehicle noise, structural noise has become the focus of most scholars. The structural noise is caused by the unbalanced force or torque produced by the power plant of the underwater vehicle, so it is of great significance to study the influence of external excitation on the acoustic and vibration characteristics of the underwater vehicle. In this paper, the influence of different types of excitation on the acoustic and vibration characteristics of the model is studied. Firstly, a cone-column combined shell model is established, and the vibration equation of the whole model is obtained by means of limit hypothesis and transfer matrix. The modal frequencies of the model are calculated by using MATLAB software. The numerical results are compared with the results of finite element simulation, and the correctness of the method is verified. Then the excitation force or moment is decomposed and applied to the model, and the vibration equation and radiation sound power of the model are derived. Finally, the finite element models of axisymmetric cylindrical shell and non-axisymmetric ellipsoidal cylindrical shell are established in the finite element software ANSYS. The effects of different types of excitation on the acoustic vibration characteristics of the model are calculated and analyzed in SYSNOISE. The influence of some structural parameters and excitation position of the model on the acoustic and vibration characteristics of the model. The results show that the axial torque excitation plays a major role in the acoustic vibration characteristics of the model, and the shell thickness of the model can effectively reduce the influence of external excitation on the acoustic vibration characteristics of the model. The increase of the number of ring ribs in the cylindrical shell section of the axisymmetric model and the influence of the ellipticity of the cylindrical shell section of the non-axisymmetric model on the acoustic vibration characteristics of the model are complicated. When the excitation point is in the middle position, the acoustic radiation power is higher than that when the excitation point is close to the two sides of the model. The purpose of this paper is to reveal the influence of different types of excitation on the acoustic and vibration characteristics of the shell model, to provide some references for the structural design of the underwater vehicle and the arrangement of the power plant, and to provide the basis and guidance for the vibration and noise reduction of the underwater vehicle.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U674.941;U661.44

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 陳美霞,駱東平,曹鋼,蔡敏波;環(huán)肋柱殼振動(dòng)和聲輻射試驗(yàn)分析[J];華中科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2003年04期

2 劉理,劉土光;復(fù)合材料錐柱結(jié)合殼的自由振動(dòng)分析[J];華中理工大學(xué)學(xué)報(bào);1997年09期

3 慕鵬;趙帥;繆輝;艾書(shū)民;;附加質(zhì)量對(duì)圓柱殼振動(dòng)特性的影響[J];企業(yè)技術(shù)開(kāi)發(fā);2011年24期

4 陳美霞,駱東平,陳小寧,蔡敏波,周鋒;有限長(zhǎng)雙層殼體聲輻射理論及數(shù)值分析[J];中國(guó)造船;2003年04期

5 魏應(yīng)三;王永生;;錐-柱組合殼體聲輻射影響因素研究[J];振動(dòng)與沖擊;2012年22期

本文編號(hào)：2456621