本文選題：雙蜂窩芯夾層板 + 固有頻率��； 參考：《南昌航空大學(xué)》2017年碩士論文

【摘要】：蜂窩芯夾層板質(zhì)量輕,比強(qiáng)度和比剛度高,具有很好的穩(wěn)定性和隔聲性能,被廣泛應(yīng)用于航空、航天等眾多領(lǐng)域,成為飛機(jī)和汽車等交通工具重要的組成部分。隨著人們對噪聲水平的要求越來越嚴(yán)苛,乘用空間的噪聲問題逐漸被重視。研究蜂窩板的振動(dòng)和隔聲性能對提高乘坐舒適性降低乘用空間的噪聲水平具有重要意義。本文對雙蜂窩芯夾層板的振動(dòng)特性和隔聲特性進(jìn)行理論分析和實(shí)驗(yàn)研究,在此基礎(chǔ)上對雙蜂窩芯夾層板進(jìn)行了多目標(biāo)優(yōu)化。首先,建立雙蜂窩芯夾層板固有頻率的理論模型,研究結(jié)構(gòu)參數(shù)對固有頻率的影響。根據(jù)Hoff假設(shè),引用正交各向異性多夾芯層板理論,分別建立單蜂窩芯和雙蜂窩芯夾層板的振動(dòng)控制方程并求解得到其固有頻率,對比分析了單、雙蜂窩芯夾層板的固有頻率和模態(tài)振型,進(jìn)而研究了雙蜂窩芯夾層板結(jié)構(gòu)參數(shù)對其固有頻率的影響。結(jié)果顯示:面板厚度、芯層厚度和面板楊氏模量對固有頻率影響較大。其次,建立雙蜂窩芯夾層板傳聲損失的理論模型,研究結(jié)構(gòu)參數(shù)對傳聲損失的影響。以有限尺寸的矩形雙蜂窩芯夾層板為研究對象,考慮入射聲為混響聲場,建立了四邊簡支邊界條件下的傳聲損失理論模型,通過數(shù)值計(jì)算對比分析了單、雙層蜂窩芯夾層板的傳聲損失,進(jìn)而研究了雙蜂窩芯夾層板結(jié)構(gòu)參數(shù)對隔聲量的影響。結(jié)果顯示:面板厚度、面板密度、芯層厚度和芯層密度對傳聲損失影響較大。然后,利用阻抗管法測量蜂窩板的傳聲損失,對比分析了單、雙蜂窩芯夾層板的傳聲損失,并通過測量不同規(guī)格的蜂窩板樣品研究了蜂窩芯厚度和蜂房邊長對隔聲量的影響。結(jié)果顯示:在低頻區(qū),增加芯層厚度明顯提高蜂窩板的隔聲性能,單蜂窩芯蜂房邊長越小隔聲性能越好。最后利用遺傳算法,在蜂窩板總厚度不變的情況下,以蜂窩板的芯層厚度、芯層等效密度和面板密度作為設(shè)計(jì)變量,先以雙蜂窩芯夾層板的隔聲量、面密度為目標(biāo)函數(shù)進(jìn)行剛度約束下的雙目標(biāo)優(yōu)化,再以雙蜂窩芯夾層板的隔聲量、面密度和彎曲最大位移為目標(biāo)函數(shù)進(jìn)行三目標(biāo)優(yōu)化,分別得到了Pareto最優(yōu)解。
[Abstract]:Honeycomb sandwich plate with light weight, high specific strength and specific stiffness, with good stability and sound insulation, has been widely used in aviation, aerospace and many other fields, and has become an important part of aircraft and automobile. As the demand for noise level becomes more and more stringent, the noise problem of passenger space is paid more and more attention. It is important to study the vibration and sound insulation of honeycomb plate to improve ride comfort and reduce the noise level of ride space. In this paper, the vibration and sound insulation characteristics of double honeycomb sandwich plate are theoretically analyzed and experimentally studied, and the multi-objective optimization of double honeycomb sandwich plate is carried out. Firstly, the theoretical model of the natural frequency of double honeycomb sandwich plate is established, and the influence of structural parameters on the natural frequency is studied. Based on the Hoff hypothesis, the vibration control equations of single honeycomb sandwich plate and double honeycomb sandwich plate are established by using the theory of orthotropic multi-sandwich laminates, and the natural frequencies are obtained. The influence of structural parameters on the natural frequency of double honeycomb sandwich plate is studied. The results show that the thickness of the panel, the thickness of the core layer and the Young's modulus of the panel have great influence on the natural frequency. Secondly, the theoretical model of sound transmission loss of double honeycomb sandwich plate is established, and the influence of structural parameters on sound transmission loss is studied. Taking the rectangular double honeycomb sandwich plate with finite size as the research object and considering the incident sound as reverberation field, a theoretical model of sound transmission loss under the condition of simply supported boundary on four sides is established. The sound transmission loss of double honeycomb sandwich plate is studied, and the influence of the structure parameters of double honeycomb sandwich plate on the sound insulation is studied. The results show that the thickness of the panel, the density of the panel, the thickness of the core layer and the density of the core layer have great influence on the sound transmission loss. Then, the acoustic loss of honeycomb plate was measured by impedance tube method, and the sound transmission loss of single and double honeycomb sandwich plates was compared and analyzed. The effects of honeycomb core thickness and beehive side length on the sound insulation were studied by measuring the honeycomb plate samples of different specifications. The results show that in the low frequency region, the sound insulation performance of the honeycomb plate is obviously improved by increasing the thickness of the core layer. The smaller the side length of the honeycomb is, the better the sound insulation performance of the honeycomb is. Finally, using genetic algorithm, when the total thickness of honeycomb plate is constant, the thickness of core layer, equivalent density of core layer and panel density of honeycomb plate are taken as design variables, and the sound insulation of sandwich plate with double honeycomb core is first used. The surface density is taken as the objective function for the optimization of the stiffness constraint. The Pareto optimal solution is obtained by using the sound insulation, the surface density and the maximum bending displacement of the double honeycomb sandwich plate as the objective functions.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.4

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本文編號：2101008