發(fā)布時(shí)間：2018-05-12 03:04

  本文選題：周期點(diǎn)陣夾芯板 + 禁帶��； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：周期點(diǎn)陣夾芯板不僅具有輕質(zhì)高強(qiáng)、節(jié)能保溫等多種優(yōu)良特性,同時(shí)具有頻率禁帶特性,即處于頻率禁帶范圍內(nèi)的振動(dòng)或波動(dòng)無(wú)法在結(jié)構(gòu)中傳播,從而實(shí)現(xiàn)減振隔聲的目的。本文分別對(duì)單層N型和X型兩種新型周期點(diǎn)陣夾芯板的減振性能、多層金字塔型周期點(diǎn)陣夾芯板的隔聲性能進(jìn)行了實(shí)驗(yàn)研究與數(shù)值分析。通過(guò)振動(dòng)傳輸實(shí)驗(yàn)測(cè)得N型和X型點(diǎn)陣夾芯板的幅頻響應(yīng)曲線,并與數(shù)值計(jì)算結(jié)果進(jìn)行了對(duì)比分析,分別考慮了拾取點(diǎn)位置、支撐形式和位置、激勵(lì)點(diǎn)位置及夾芯板泡沫填充等影響因素。通過(guò)隔聲實(shí)驗(yàn)測(cè)得金字塔型點(diǎn)陣夾芯板的傳聲損失曲線,并與有限元數(shù)值計(jì)算結(jié)果進(jìn)行了對(duì)比分析。得出以下結(jié)論:(1)N型和X型點(diǎn)陣夾芯板對(duì)于禁帶頻率范圍內(nèi)的振動(dòng)具有良好的隔振性能,實(shí)驗(yàn)得到的衰減域頻率范圍與數(shù)值結(jié)果基本吻合。夾芯板的芯體結(jié)構(gòu)形式對(duì)隔振性能影響較大,實(shí)驗(yàn)與數(shù)值模擬結(jié)果均顯示N型點(diǎn)陣夾芯板具有超寬禁帶,衰減域?qū)挾瓤蛇_(dá)到400Hz,隔振性能優(yōu)于X型點(diǎn)陣夾芯板。N型和X型周期點(diǎn)陣夾芯板良好的隔振效果使得點(diǎn)陣夾芯板在減振隔振領(lǐng)域具有廣闊的前景(2)N型和X型點(diǎn)陣夾芯板的禁帶特性主要源于其內(nèi)部芯體的周期性點(diǎn)陣排布方式。實(shí)驗(yàn)與數(shù)值模擬結(jié)果均顯示隨著周期數(shù)增加,夾芯板的隔振性能更優(yōu)。不同的支撐形式和位置、激勵(lì)點(diǎn)位置等因素對(duì)夾芯板隔振性能影響很小。泡沫填充能夠有效增大結(jié)構(gòu)的衰減頻率范圍及衰減程度,特別是對(duì)于高頻振動(dòng)具有良好的減弱效果,對(duì)周期點(diǎn)陣夾芯板的隔振性能起到了積極作用。(3)實(shí)驗(yàn)與數(shù)值模擬結(jié)果均顯示金字塔型點(diǎn)陣夾芯板對(duì)于特定頻率范圍內(nèi)的聲波具有很好的隔聲性能,傳聲損失可達(dá)35dB,衰減域?qū)挾瓤蛇_(dá)到450Hz。金字塔型周期點(diǎn)陣夾芯板的良好隔聲效果有利于其在隔聲降噪領(lǐng)域的應(yīng)用。(4)聲波在通過(guò)點(diǎn)陣夾芯板時(shí)由于層間空氣與結(jié)構(gòu)的耦合作用會(huì)導(dǎo)致傳聲損失曲線的衰減域頻率范圍與振動(dòng)禁帶頻率范圍存在偏差。點(diǎn)陣夾芯板的材料密度越小,耦合作用越強(qiáng),偏差越大。且材料密度很小時(shí),傳聲損失普遍減小,聲波無(wú)明顯的衰減域。
[Abstract]:The periodic lattice sandwich panel not only has many excellent characteristics, such as light and high strength, energy saving and heat preservation, but also has the characteristics of frequency band gap, that is, the vibration or wave within the range of frequency forbidden band can not be propagated in the structure, so as to achieve the purpose of reducing vibration and isolating sound. In this paper, the vibration absorption performance of two new periodic lattice sandwich panels, single layer N type and X type, and the sound insulation performance of multi-layer pyramid periodic lattice sandwich panels are studied experimentally and numerically. The amplitude-frequency response curves of N-type and X-type lattice sandwich panels were measured by vibration transmission experiments, and the results were compared with those of numerical calculation. The position, support form and position of pick-up points were considered, respectively. The influence factors such as the position of the excitation point and the foam filling of the sandwich panel. The acoustic loss curves of pyramid lattice sandwich panels were measured by sound insulation experiments and compared with the results of finite element numerical calculation. The following conclusions are drawn: the N type and X type lattice sandwich panels have good isolation performance for vibration in the band gap frequency range, and the frequency range in the attenuation domain obtained by the experiment is in good agreement with the numerical results. The core structure of sandwich panel has great influence on the vibration isolation performance. The experimental and numerical simulation results show that the N-type lattice sandwich panel has an ultra-wide band gap. The attenuation domain width can reach 400 Hz, and the vibration isolation performance is better than that of X type lattice sandwich plate. N type and X type periodic lattice sandwich board. The band gap of the core is mainly due to the periodic lattice arrangement of the inner core. Both experimental and numerical results show that the vibration isolation performance of sandwich panels is better with the increase of the number of cycles. The vibration isolation performance of sandwich panel is influenced little by different supporting form and position, excitation point position and so on. Foam filling can effectively increase the attenuation frequency range and attenuation degree of the structure, especially for high frequency vibration. The results of experiment and numerical simulation show that the pyramid lattice sandwich panel has good sound insulation performance for the specific frequency range. The loss of sound transmission can reach 35 dB, and the width of attenuation domain can reach 450 Hz. The good sound insulation effect of pyramid periodic lattice sandwich panel is advantageous to its application in the field of sound insulation and noise reduction.) the sound wave passing through the lattice sandwich panel will lead to the attenuation of the sound transmission loss curve due to the coupling between the air and the structure between the layers. There is a deviation between the domain frequency range and the vibration band gap frequency range. The smaller the material density, the stronger the coupling and the greater the deviation. When the material density is very small, the sound transmission loss is generally reduced, and the sound wave has no obvious attenuation region.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB535.1

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