本文選題：聲子晶體 + 組合桿��； 參考：《哈爾濱工程大學(xué)》2014年碩士論文

【摘要】：隨著我國(guó)科技和國(guó)防工業(yè)的飛速發(fā)展,人們對(duì)減振降噪技術(shù)的需求日益迫切,如何解決現(xiàn)代工程技術(shù)中普遍存在的機(jī)械振動(dòng)問(wèn)題成為工程領(lǐng)域研究的熱點(diǎn)問(wèn)題之一。聲子晶體在其內(nèi)部周期機(jī)制的作用下,可以抑制一定頻帶范圍內(nèi)的彈性波的傳播,具有“天然”的減振降噪特性。將聲子晶體思想引入到各類桿件及由其組成的并聯(lián)平臺(tái)的設(shè)計(jì)中,利用其帶隙特性對(duì)結(jié)構(gòu)振動(dòng)進(jìn)行控制,為解決振動(dòng)問(wèn)題提供了一種新思路,具有重要的工程應(yīng)用價(jià)值。本文在聲子晶體理論的基礎(chǔ)上,將理論分析和仿真驗(yàn)證相結(jié)合,對(duì)元件級(jí)和部件級(jí)的聲子晶體組合桿及其并聯(lián)平臺(tái)的振動(dòng)特性進(jìn)行了深入的分析和研究,并利用遺傳算法對(duì)影響元部件級(jí)聲子晶體組合桿帶隙特性的因素進(jìn)行了優(yōu)化設(shè)計(jì)。論文的主要研究?jī)?nèi)容如下:1.采用傳遞矩陣法,對(duì)聲子晶體平面組合桿、空間組合桿及并聯(lián)平臺(tái)的振動(dòng)特性,分別進(jìn)行理論推導(dǎo)和數(shù)值分析。2.對(duì)聲子晶體組合桿和減振平臺(tái)進(jìn)行有限元仿真分析,并與理論分析結(jié)果進(jìn)行對(duì)比。在此基礎(chǔ)上,進(jìn)一步研究各關(guān)鍵影響因素對(duì)振動(dòng)特性的影響,以獲得參數(shù)影響規(guī)律。3.將遺傳算法引入聲子晶體振動(dòng)特性反問(wèn)題的研究。對(duì)影響聲子晶體平面和空間組合桿帶隙特性的各關(guān)鍵參數(shù)進(jìn)行了優(yōu)化設(shè)計(jì)。研究表明,由于聲子晶體固有的帶隙特性以及組合桿在結(jié)合處發(fā)生的波形轉(zhuǎn)換效應(yīng),聲子晶體平面組合桿、空間組合桿及由其組成的減振平臺(tái)具有多維寬頻減振能力,是十分良好的工程減振元件或部件,這對(duì)于推動(dòng)聲子晶體在工程應(yīng)用領(lǐng)域的發(fā)展具有重要的實(shí)際意義。
[Abstract]:With the rapid development of science and technology and national defense industry in China, the demand for vibration and noise reduction technology is becoming more and more urgent. How to solve the problem of mechanical vibration, which is widely existing in modern engineering technology, has become one of the hot issues in the field of engineering. Under the action of its internal periodic mechanism, phononic crystals can suppress the propagation of elastic waves in a certain frequency band, and have the characteristics of "natural" vibration and noise reduction. The idea of phonon crystal is introduced into the design of various kinds of bars and parallel platform, and the vibration of the structure is controlled by its band gap characteristic, which provides a new way to solve the vibration problem and has important engineering application value. Based on the theory of phonon crystal, the vibration characteristics of the component and component level phonon crystal composite rod and its parallel platform are analyzed and studied by combining the theoretical analysis and simulation. The factors affecting the band gap characteristics of component level phonon crystal combination rod are optimized by genetic algorithm. The main contents of this thesis are as follows: 1. By using the transfer matrix method, the vibration characteristics of the planar composite rod, the spatial composite rod and the parallel platform of phononic crystal are derived theoretically and numerically respectively. The finite element simulation analysis of phonon crystal combination rod and damping platform is carried out, and the results are compared with the theoretical analysis. On this basis, the influence of the key factors on the vibration characteristics is further studied in order to obtain the influence law of parameters. 3. Genetic algorithm is introduced into the inverse problem of phonon crystal vibration characteristics. The key parameters affecting the band gap characteristics of planar and spatial combination rods of phononic crystals are optimized. The results show that, due to the inherent band gap characteristics of phononic crystals and the waveform conversion effect of the combination rod at the joint, the planar composite rod, the spatial composite rod and the damping platform of the phonon crystal have multi-dimensional broadband vibration absorption capability. It is of great practical significance to promote the development of phononic crystals in engineering applications.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB535

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