本文選題：振動(dòng)傳遞 + 空心截面阻振結(jié)構(gòu)�。� 參考：《江蘇科技大學(xué)》2015年碩士論文

【摘要】：船舶結(jié)構(gòu)的振動(dòng)會(huì)產(chǎn)生很多不利影響,如軸系振動(dòng)會(huì)破壞軸系穩(wěn)定性,設(shè)備振動(dòng)會(huì)破壞儀器的精密性、縮短其使用壽命等;同時(shí),振動(dòng)往往會(huì)伴隨產(chǎn)生噪聲,一方面會(huì)產(chǎn)生空氣噪聲,影響船員工作生活的舒適度;另一方面,會(huì)通過船體結(jié)構(gòu)向外傳遞,與周圍流體介質(zhì)相互作用,產(chǎn)生輻射噪聲,從而影響其隱身性。所以,在船舶結(jié)構(gòu)中采取減振措施至關(guān)重要,同時(shí)也可以達(dá)到降噪的目的。由薄殼加筋結(jié)構(gòu)構(gòu)成的大型結(jié)構(gòu),其減振措施主要是阻尼減振以及質(zhì)量阻振,前者通過耗散結(jié)構(gòu)振動(dòng)能量達(dá)到減振的目的;后者通過打斷結(jié)構(gòu)的連續(xù)性,引起阻抗失配,導(dǎo)致振動(dòng)波發(fā)生反射和透射現(xiàn)象,從而達(dá)到隔振的目的。本文在空心截面阻振質(zhì)量被提出基礎(chǔ)上,研究了空心截面阻振復(fù)合結(jié)構(gòu)的阻振性能,從實(shí)驗(yàn)和應(yīng)用兩方面,研究了其對(duì)簡單薄板、復(fù)雜船體板-基座結(jié)構(gòu)的振動(dòng)傳遞的阻抑性能,以及其對(duì)雙層圓柱殼體(水下航行器的典型結(jié)構(gòu))聲振特性的影響。首先,開展了簡單薄板結(jié)構(gòu)振動(dòng)傳遞實(shí)驗(yàn),以振動(dòng)傳遞函數(shù)及其插入損失為評(píng)價(jià)標(biāo)準(zhǔn),研究了空心截面阻振結(jié)構(gòu)的阻振性能、微孔發(fā)泡丁基橡膠阻尼減振性能以及復(fù)合阻振結(jié)構(gòu)阻振性能;進(jìn)而開展了復(fù)雜船體板-基座結(jié)構(gòu)振動(dòng)傳遞實(shí)驗(yàn),以機(jī)械導(dǎo)納及其插入損失為評(píng)價(jià)標(biāo)準(zhǔn),研究了基座結(jié)構(gòu)中插入空心截面阻振結(jié)構(gòu)的阻振性能、基座結(jié)構(gòu)中粘貼阻尼層的阻尼減振性能和在空心截面阻振結(jié)構(gòu)中填充顆粒阻尼所構(gòu)成結(jié)構(gòu)的阻振性能,以及在其基礎(chǔ)上研究了復(fù)合阻振結(jié)構(gòu)的復(fù)合阻振性能。其次,建立了基于波動(dòng)耦合分析的FE-SEA混合法的雙層圓柱殼體(水下航行器動(dòng)力艙段)的水下模型,研究了不同類型基座、不同殼間介質(zhì)對(duì)其聲振特性的影響;研究了動(dòng)力設(shè)備激勵(lì)源作用時(shí)的聲振特性,以及研究了多激勵(lì)源作用時(shí)的水下聲振特性的預(yù)報(bào)方法,并指出了其有效性。最后,以所建立的FE-SEA混合法雙層圓柱殼體模型為載體,研究了在圓柱殼體中應(yīng)用空心截面阻振復(fù)合結(jié)構(gòu)時(shí)對(duì)其聲振特性的影響。以艙壁基座為對(duì)象,研究了空心截面阻振結(jié)構(gòu)的截面形狀、布置位置對(duì)圓柱殼體聲振特性的影響;以平臺(tái)基座為對(duì)象,研究了空心截面阻振結(jié)構(gòu)的阻振性能、丁基橡膠阻尼材料的減振性能以及復(fù)合阻振結(jié)構(gòu)的阻振性能對(duì)圓柱殼體聲振特性的影響;將基座四周阻振設(shè)計(jì)思想進(jìn)行擴(kuò)展,從而將空心截面阻振結(jié)構(gòu)布置在殼體中耐壓殼體與外殼體、平臺(tái)結(jié)構(gòu)以及艙壁等的連接處,研究了新型連接下的圓柱殼體的聲振特性。本文從實(shí)驗(yàn)和應(yīng)用的角度研究了復(fù)合阻振結(jié)構(gòu),分析了其阻振性能,指出其較單一的減振方式的優(yōu)異性,能夠有效地降低船舶結(jié)構(gòu)的振動(dòng),從而達(dá)到減振降噪的目的。本文研究成果對(duì)于船舶結(jié)構(gòu)聲學(xué)設(shè)計(jì),具有參考價(jià)值。
[Abstract]:The vibration of ship structure will have a lot of adverse effects, such as shafting vibration will destroy the stability of shafting, equipment vibration will destroy the precision of instrument, shorten its service life, etc. At the same time, vibration will often be accompanied by noise.On the one hand, it will produce air noise, which will affect the comfort of crew's work and life; on the other hand, it will transfer outward through the hull structure and interact with the surrounding fluid medium to produce radiation noise, thus affecting its stealth.Therefore, it is very important to take vibration reduction measures in ship structure, and can also achieve the purpose of noise reduction.For a large structure composed of stiffened thin shell, the main measures are damping and damping, the former achieves the purpose of vibration reduction by dissipating the vibration energy of the structure, and the latter causes impedance mismatch by interrupting the continuity of the structure.The vibration wave is reflected and transmitted, and the vibration isolation is achieved.In this paper, on the basis of the vibration resistance quality of hollow section is proposed, the vibration resistance performance of hollow section vibration resistant composite structure is studied, and its effect on simple thin plate is studied from two aspects of experiment and application.The influence of the vibration transfer of the complex hull slab-pedestal structure on the acoustic and vibration characteristics of the double-layer cylindrical shell (the typical structure of underwater vehicle) is discussed.First of all, the vibration transfer experiment of simple thin plate structure is carried out. The vibration resistance performance of hollow section vibration resistance structure is studied by using the vibration transfer function and its insertion loss as the evaluation criteria.The damping and damping performance of microcellular foamed butyl rubber and the vibration resistance of composite vibration resistant structure were studied, and the vibration transfer experiment of complex hull slab-base structure was carried out, and the mechanical admittance and insertion loss were used as the evaluation criteria.In this paper, the performance of the anti-vibration structure with hollow section inserted in the base structure is studied. The damping and damping performance of the base structure with damping layer and the damping property of the structure filled with particle damping in the structure with hollow cross-section are studied.On the basis of it, the performance of composite vibration resistance structure is studied.Secondly, the underwater model of double-layer cylindrical shell (power cabin of underwater vehicle) based on the FE-SEA hybrid method of wave coupling analysis is established, and the influence of different types of base and medium between shells on its acoustic and vibration characteristics is studied.In this paper, the acoustic and vibration characteristics of power equipment under excitation source and the prediction method of underwater acoustic vibration characteristics under multiple excitation sources are studied, and its effectiveness is pointed out.Finally, the influence of hollow cross-section vibration resistive composite structure on the acoustic and vibration characteristics of double-layer cylindrical shell with FE-SEA mixing method is studied.Taking the bulkhead base as the object, the section shape of the hollow section vibration resistance structure and the influence of the arrangement position on the acoustic vibration characteristic of the cylindrical shell are studied, and the vibration resistance performance of the hollow section vibration resistance structure is studied by taking the platform base as the object.The influence of the damping property of butyl rubber and the vibration resistance of composite structure on the acoustic and vibration characteristics of cylindrical shell, the design idea of vibration resistance around the base is extended,Thus, the hollow section vibration resistance structure is arranged at the junction of the pressure resistant shell and the shell, the platform structure and the bulkhead in the shell, and the acoustic and vibration characteristics of the cylindrical shell under the new connection are studied.From the point of view of experiment and application, this paper studies the structure of compound vibration resistance, analyzes its performance of vibration resistance, and points out that the excellent performance of the single way of damping vibration can effectively reduce the vibration of ship structure and achieve the purpose of reducing vibration and noise.The research results of this paper have reference value for the acoustic design of ship structure.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U661.44

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本文編號(hào)：1760152