本文選題：周期性復(fù)合結(jié)構(gòu) + 禁帶　； 參考：《湖南大學(xué)》2013年碩士論文

【摘要】：振動(dòng)與噪聲廣泛存在于建筑、機(jī)械、航空等各個(gè)領(lǐng)域中，抑制有害的振動(dòng)與噪聲就成為了工程技術(shù)中迫切需要解決的問(wèn)題。作為傳遞振動(dòng)的主要媒介—固體結(jié)構(gòu)，其傳播距離遠(yuǎn)，并且衰減較小，因此對(duì)固體結(jié)構(gòu)的振動(dòng)噪聲控制是人們普遍關(guān)心的問(wèn)題。采用周期性復(fù)合結(jié)構(gòu)在振動(dòng)噪聲傳遞途徑上對(duì)其進(jìn)行隔離為這個(gè)問(wèn)題的解決提供了新的思路。周期性復(fù)合結(jié)構(gòu)具有彈性波或聲波禁帶，，即處于禁帶頻率范圍內(nèi)的彈性波或聲波被禁止傳播。因此，禁帶處于實(shí)際的振動(dòng)或者噪聲頻率范圍內(nèi)的周期性結(jié)構(gòu)為現(xiàn)有工程實(shí)際中振動(dòng)噪聲問(wèn)題的解決提供了一種新的可能。 本文在討論了周期性復(fù)合結(jié)構(gòu)的現(xiàn)有基本理論和研究方法的基礎(chǔ)上，研究了側(cè)面嵌入空氣柱周期性結(jié)構(gòu)薄板的禁帶特性和隔聲降噪性能，探究其用于工程結(jié)構(gòu)中振動(dòng)噪聲控制的可行性。主要研究?jī)?nèi)容包括： (1)利用平面波展開(kāi)法和有限元法計(jì)算了側(cè)面嵌入空氣柱周期性結(jié)構(gòu)薄板基本原胞的能帶結(jié)構(gòu)，并對(duì)計(jì)算結(jié)果進(jìn)行比較分析。 (2)在基本原胞的基礎(chǔ)上，對(duì)側(cè)面嵌入空氣柱周期性結(jié)構(gòu)薄板的填充率等結(jié)構(gòu)參數(shù)進(jìn)行調(diào)制，研究了結(jié)構(gòu)參數(shù)變化對(duì)禁帶位置和寬度的影響。 (3)研究了無(wú)限周期和有限周期一維周期性結(jié)構(gòu)的傳播特性計(jì)算方法，并探討了該型薄板用于隔聲降噪的可行性。 (4)計(jì)算分析了有限長(zhǎng)度側(cè)面嵌入空氣柱周期性結(jié)構(gòu)薄板的傳輸特性曲線(xiàn)，討論了周期數(shù)和填充率變化對(duì)隔聲性能的影響，并通過(guò)薄板的位移場(chǎng)研究了結(jié)構(gòu)參數(shù)對(duì)振動(dòng)隔離的影響。結(jié)果表明，通過(guò)參數(shù)的合理調(diào)制和搭配，側(cè)面嵌入空氣柱周期性結(jié)構(gòu)薄板能夠調(diào)節(jié)禁帶位置和增加衰減程度，達(dá)到良好的隔聲降噪效果。
[Abstract]:Vibration and noise widely exist in the fields of building, machinery, aviation and so on. It is urgent to solve the problem of suppressing harmful vibration and noise in engineering technology. As the main medium of transmitting vibration, solid structure has long propagation distance and low attenuation. Therefore, the control of vibration and noise of solid structure is a common concern. Isolation of periodic composite structures from vibration and noise transmission provides a new way to solve this problem. Periodic composite structures have elastic wave or acoustic band gap, that is, elastic wave or acoustic wave in the range of band gap frequency is forbidden to propagate. Therefore, periodic structures with forbidden bands in the range of actual vibration or noise frequencies provide a new possibility for solving the problem of vibration and noise in existing engineering practice. On the basis of discussing the existing basic theory and research methods of periodic composite structure, this paper studies the characteristics of bandgap and sound insulation and noise reduction of the thin plate of periodic structure with side-embedded air column. The feasibility of its application in vibration and noise control of engineering structures is explored. The main research contents include: 1) the energy band structure of thin plate with periodic structure embedded in air column is calculated by using plane wave expansion method and finite element method, and the calculated results are compared and analyzed. 2) on the basis of the basic primitive cell, the structural parameters such as the filling ratio of the periodic structural thin plate embedded in the side air column are modulated, and the influence of the structural parameters on the position and width of the gap band is studied. The propagation characteristics of infinite periodic and finite periodic one-dimensional periodic structures are studied, and the feasibility of using this type of thin plate for acoustic noise reduction is discussed. In this paper, the propagation characteristic curve of thin plate with finite length side embedded air column is calculated and analyzed, and the influence of period number and filling rate on sound insulation is discussed. The effect of structural parameters on vibration isolation is studied by displacement field of thin plate. The results show that through the reasonable modulation and collocation of parameters, the lateral embedded periodic thin plate of air column can adjust the position of band gap and increase the attenuation degree, and achieve a good effect of sound insulation and noise reduction.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TB535

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本文編號(hào)：1884315