本文選題：雙層加筋板　切入點(diǎn)：振聲特性　出處：《山東大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：科學(xué)技術(shù)的迅速發(fā)展使得人們對物質(zhì)生活水平和精神生活水平提出了更高的要求,在交通運(yùn)輸方面,人們不僅追求其便捷性,也對其舒適性有了更高的要求。對于高鐵、動(dòng)車、飛機(jī)等高速交通工具,噪聲問題是影響其舒適性的重要原因之一,因此,如何預(yù)測和控制高速交通工具的噪聲日益受到人們的關(guān)注。筋板結(jié)構(gòu)作為最常用的工程結(jié)構(gòu)之一,通常用于組成高速交通工具的艙室部分。在振動(dòng)激勵(lì)或聲載荷激勵(lì)作用下,其聲輻射特性及隔聲特性極大的影響著艙內(nèi)噪聲水平,進(jìn)而影響著交通工具的舒適性。故而,對筋板類結(jié)構(gòu)的振聲特性和隔聲量結(jié)果的研究一直受到眾多學(xué)者的廣泛關(guān)注。雙層加筋板作為筋板類結(jié)構(gòu)中的代表性結(jié)構(gòu),盡管國內(nèi)外學(xué)者對其振聲特性和隔聲性能已有了較深的研究,但關(guān)于雙層加筋板中部分參數(shù)敏感性影響的討論仍相對缺乏。本文作者在已有研究基礎(chǔ)上,在國家自然科學(xué)基金“大型復(fù)雜組合系統(tǒng)參數(shù)不定性動(dòng)態(tài)影響的量化研究”(51175300)和山東省自然科學(xué)基金“工程肋板結(jié)構(gòu)的近高頻振動(dòng)特征及噪聲傳遞特性研究”(ZR2011EEM009)的資助下,詳細(xì)研究了相鄰加強(qiáng)筋間距、加強(qiáng)筋高度對雙層加筋板的振聲特性和隔聲量結(jié)果的影響,并討論了其振聲特性和隔聲性能對于加強(qiáng)筋高度、相鄰加強(qiáng)筋間距等參數(shù)的敏感性。本文的主要研究內(nèi)容及結(jié)論如下：(1)在理論方面：首先,本文研究了單板結(jié)構(gòu)的振動(dòng)特性及聲輻射特性的相關(guān)理論,建立相應(yīng)的仿真數(shù)例模型,并驗(yàn)證其正確性。其次,總結(jié)了單板隔聲特性的相關(guān)理論,并通過對比理論、仿真及實(shí)驗(yàn)結(jié)果,驗(yàn)證了單板隔聲仿真模型的有效性。在此基礎(chǔ)上,引入了雙層中空板及雙層加筋板隔聲特性理論。(2)在振聲特性方面,利用法國ESI集團(tuán)于2005年推出的全頻振動(dòng)噪聲軟件VA One建立雙層加筋板的有限元模型,分別研究了雙層加筋板總質(zhì)量不變與可變的情況下,相鄰加強(qiáng)筋間距、加強(qiáng)筋高度的變化對其振聲特性的影響。并討論了雙層加筋板的振聲特性對間距、高度等參數(shù)的敏感性。得出結(jié)論：隨著相鄰加強(qiáng)筋間距的增大,雙層加筋板的固有頻率逐漸減小,輻射聲功率曲線的波峰值逐漸向低頻方向移動(dòng)；頻率增大時(shí),固有頻率對間距變化的敏感性增大。隨著加強(qiáng)筋高度的增加,雙層加筋板的固有頻率逐漸增大,其輻射聲功率曲線的波峰值逐漸向高頻方向移動(dòng)；頻率增大時(shí),固有頻率對間距變化的敏感性增大。其振聲特性對相鄰加強(qiáng)筋間距、加強(qiáng)筋高度微小變化的敏感性逐漸增大。因此,在低頻區(qū),雙層加筋板的振聲特性對加強(qiáng)筋高度的微小變化更為敏感。(3)在隔聲性能方面,首先,根據(jù)三分之一倍頻程帶寬內(nèi)模態(tài)數(shù)的多少,將分析頻率區(qū)間劃分為中低頻區(qū)間和高頻區(qū)間。在中低頻區(qū)間內(nèi),利用等效建模方法,驗(yàn)證雙層加筋板有限元模型的正確性。在高頻區(qū)間內(nèi),根據(jù)相關(guān)理論,進(jìn)行MATLAB軟件編程計(jì)算。分別研究了雙層加筋板總質(zhì)量不變與可變的情況下,相鄰加強(qiáng)筋間距、加強(qiáng)筋高度對其隔聲性能的影響,并討論了雙層加筋板的隔聲性能對其間距、高度等參數(shù)的敏感性,得出結(jié)論：隨著相鄰加強(qiáng)筋間距的增大,雙層加筋板的固有頻率值逐漸減小,其隔聲波谷向低頻方向移動(dòng)。隨著加強(qiáng)筋高度的增加,雙層加筋板的固有頻率逐漸增大,其隔聲波谷逐漸向高頻方向移動(dòng)。
[Abstract]:The rapid development of science and technology makes people put forward higher requirements on the level of material life and spiritual life, in the area of transport, it is not only the pursuit of its convenience, but also their comfort have higher requirements for high-speed rail, high-speed EMU, aircraft and other vehicles, the noise problem is one of an important reason for their comfort, therefore, how to predict and control the noise of high-speed vehicle has attracted more and more attention. The rib structure as one of the most commonly used engineering structure, usually used for high-speed vehicle cabin parts. In vibration or acoustic excitation, the sound radiation characteristics and sound insulation properties greatly affects the noise level of the cabin, and then affect the vehicle comfort. Therefore, the research of acoustic vibration characteristics and sound insulation result of stiffened plate structure has been the subject of widespread concern of many scholars. As a representative of the stiffened plates reinforced plate structure in the structure, although the domestic and foreign scholars on the acoustic vibration characteristics and sound insulation performance has been deep research, but the discussion on the effects of some parameters of double stiffened plate is the relative lack of sensitivity. The author of this paper based on the existing research, the quantitative research of the National Natural Science Foundation Parameters of large complex combination of system uncertainty dynamic effect "(51175300) and high frequency vibration characteristics and noise floor structure of the natural science foundation of Shandong province" project of the transmission characteristics of "(ZR2011EEM009) funding, a detailed study of the influence of adjacent stiffener spacing, stiffener height on double stiffened plate vibration the acoustic properties of sound insulation and results, and discuss its acoustic characteristics and sound insulation performance for stiffener height sensitivity adjacent stiffener spacing and other parameters. The main research contents and conclusions Are as follows: (1) in the aspect of theory: firstly, this thesis studies theory of vibration and acoustic radiation characteristics of single plate structure, the number of cases of a corresponding simulation model, and verify its correctness. Secondly, summarizes the related theory of single board insulation characteristics, and through the comparison of theory, simulation and experimental results. To verify the effectiveness of the single board acoustic simulation model. Based on this, introduced the theory of sound insulation properties of double-layer hollow plate and double ribbed. (2) in the acoustic characteristics, the finite element model of full frequency vibration and noise by using One software VA France ESI group in 2005 launched the establishment of double stiffened plates, respectively. Study on the double stiffened plate total quality constant and variable under the influence of adjacent stiffener spacing, strengthening rib height changes on its acoustic characteristics. And discussed the acoustic characteristic of the double stiffened plates of spacing, height sensitivity parameters is obtained. Conclusion: with the increase of the adjacent strengthening reinforcement spacing, the natural frequency of double stiffened plate decreases, the peak value of the radiation sound power curve gradually shifted to the low frequency; frequency increases, the natural frequency sensitivity to pitch change increases. With the increase of reinforcement height, the natural frequency of double stiffened plate is gradually increased, the the peak value of the radiated sound power curve moves to the high frequency direction; when the frequency increases, the natural frequency sensitivity to pitch variation increases. The vibration and acoustic characteristics of stiffener spacing on the adjacent rib height, strengthen sensitive small changes gradually increased. Therefore, in low frequency, vibration and noise characteristics of double stiffened plate of small changes the stiffener height is more sensitive. (3) the sound insulation performance, first of all, according to the 1/3 octave bandwidth in the number of modes, the analysis of the frequency interval is divided into low frequency and high frequency in the area between the area . in the low-frequency range, using the equivalent modeling method, verify the correctness of the finite element model of double deck stiffened plate. In the high frequency range, according to the relevant theory of the software of MATLAB. Were studied by double stiffened plate total quality constant and variable under the adjacent reinforcing rib spacing, reinforcement effect of height on the sound insulation performance, and discusses the double deck stiffened plate with sound insulation performance of the spacing, height and other parameters of the sensitivity, we draw the conclusion that with the increase of the adjacent strengthening reinforcement spacing, the natural frequency of double stiffened plate decreases, the vibration wave valley toward low frequency. With the increase of reinforcement height the natural frequency of double stiffened plate increases, the sound insulation trough gradually move to the high frequency direction.

【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB533.2

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本文編號(hào)：1590743