新型聲波器件的結(jié)構(gòu)與性能研究
發(fā)布時間：2018-10-21 13:54
【摘要】：本文主要從事新型聲波器件的結(jié)構(gòu)與性能研究,全文共分為五章,除了第-章和第五章為緒論和總結(jié)與展望外,主要研究工作分為三個部分：(1)帶基底聲柵格結(jié)構(gòu)超常透射的研究；(2)耦合共振系統(tǒng)雙通濾波特性的研究；(3)種基于非線性碰撞的分諧頻裝置。各部分的簡要內(nèi)容如下：1.帶基底聲柵格結(jié)構(gòu)超常透射的研究光波通過亞波長狹縫時會出現(xiàn)超常透射現(xiàn)象,聲波也是這樣。論文的第一章中簡單介紹了聲柵格結(jié)構(gòu)超常透射的研究進(jìn)展,相比于光柵格中的等離子體的激發(fā),聲柵格超常透射是由于柵格中橫向耦合共振模式聲波的激發(fā)。這種柵格結(jié)構(gòu)的超構(gòu)材料在聲準(zhǔn)直、單向傳輸?shù)确矫娑加泻芎玫膽?yīng)用。論文第二章,首先簡單介紹了帶基底聲柵格結(jié)構(gòu)的單向流通特性,并且指出這種單向透射是由于聲波經(jīng)柵格透射后重新分布為周期性源激發(fā)基底板的彎曲模式,從而輻射聲波。隨后通過柵格覆膜、改變柵格與覆膜間的填充液等方法對禁帶頻域內(nèi)的聲場透射效果進(jìn)行增強(qiáng)。然后對聲波非準(zhǔn)直入射的透射效果進(jìn)行研究,發(fā)現(xiàn)聲波非準(zhǔn)直入射后會出現(xiàn)負(fù)透射的效果,并給出了不同入射角度下出現(xiàn)負(fù)透射的聲場傳播圖。最后,指出這種帶基底聲柵格結(jié)構(gòu)在非準(zhǔn)直入射情況下具有很好的聲波發(fā)散效果。2.耦合共振系統(tǒng)雙通濾波特性的研究聲超構(gòu)材料具有局域共振的特性,會導(dǎo)致材料出現(xiàn)動態(tài)的負(fù)有效質(zhì)量或負(fù)的彈性模量,甚至是雙負(fù)材料,這種具有負(fù)參量的聲超構(gòu)材料在超透鏡、平板聲聚焦上都有好的表現(xiàn)。局域共振型聲超構(gòu)材料的研究進(jìn)展及發(fā)展過程可以參見論文第一章。論文第三章首先簡要介紹了薄膜型聲超構(gòu)材料的研究現(xiàn)狀。隨后提出了我們所構(gòu)建的雙耦合共振系統(tǒng),PE環(huán)——鋁塊共振系統(tǒng)和薄膜——空氣柱系統(tǒng)。這樣一個雙耦合共振系統(tǒng)具有雙通濾波的特性,局部的速度振動圖像證實(shí)了低頻透射峰是由于薄膜——空氣柱系統(tǒng)的本征振動；兩個系統(tǒng)的耦合作用影響著透射谷和高頻透射峰。更重要的是,兩個透射峰可以通過兩個系統(tǒng)分別獨(dú)立地控制。這樣很容易實(shí)現(xiàn)一種聲屏蔽和雙通濾波的聲學(xué)裝置。3.基于非線性碰撞的分諧頻裝置論文第四章,主要介紹了非線性碰撞的分諧頻效應(yīng)的相關(guān)調(diào)研工作。首先簡單介紹了超聲遠(yuǎn)紅外無損檢測中出現(xiàn)的聲混沌現(xiàn)象,隨后介紹了非線性碰撞中的次諧波的研究模型及有限元分析模型,然后提出了我們所構(gòu)建的非線性碰撞分諧頻的模型,利用我們所構(gòu)建的PE環(huán)——鋁塊共振系統(tǒng)代替變幅桿去撞擊金屬板,并且采用另一個不同共振頻率的PE環(huán)——鋁塊系統(tǒng)代替金屬板,這樣聲波從不同共振系統(tǒng)方向入射時會產(chǎn)生更加豐富的物理效果。最后利用ANSYS對模型進(jìn)行了前期簡單的分析處理。第五章,是關(guān)于本文的工作總結(jié)及對未來工作的展望。
[Abstract]:In this paper, the structure and performance of new acoustic devices are mainly studied. The whole paper is divided into five chapters, except the introduction and summary and prospect of chapters-and 5. The main research work is divided into three parts: (1) the study of the supernormal transmission of the acoustic grid structure with the substrate; (2) the study of the double pass filtering characteristics of the coupled resonance system; (3) the harmonic frequency divider based on nonlinear collision. The brief contents of each part are as follows: 1. Study on the supernormal transmission of the subwavelength slotted structure the phenomenon of supernormal transmission occurs when the light waves pass through the subwavelength slit as well as the acoustic waves. In the first chapter, the research progress of supernormal transmission of acoustic grid structure is briefly introduced. Compared with the excitation of plasma in grating lattice, the supernormal transmission of acoustic grid is due to the excitation of transversely coupled resonance mode sound waves in the grid. The superstructure of the grid structure has good applications in acoustic collimation, unidirectional transmission and so on. In the second chapter, the unidirectional flow characteristics of the sonic grid structure with a substrate are briefly introduced, and it is pointed out that the one-way transmission is due to the sound wave being redistributed as a periodic source to excite the bending mode of the substrate, which radiates the sound wave. Then the transmission effect of sound field in the band gap domain is enhanced by changing the filling liquid between the grid and the film. Then the transmission effect of non-collimating incidence of sound wave is studied. It is found that the negative transmission effect will occur when the acoustic wave is not collimated and the propagation diagram of the acoustic field with negative transmission at different incidence angles is given. Finally, it is pointed out that the acoustic grid structure with a substrate has a good acoustic divergence effect in the case of non-collimating incidence. Study on Dual-pass filtering characteristics of coupled Resonance system; Acoustic superstructure materials have local resonance characteristics, which can lead to dynamic negative effective mass or negative elastic modulus, even double negative materials. This kind of acoustic superstructure material with negative parameters has good performance in supersonic lens and plate acoustic focusing. The research progress and development of local resonance acoustic superstructure materials can be found in Chapter 1 of this paper. In the third chapter, the research status of thin film acoustic superstructure materials is briefly introduced. Then we propose the double coupling resonance system, the PE ring aluminum block resonance system and the thin film air column system. Such a double coupling resonance system has the characteristic of double pass filter. The local velocity vibration image proves that the low frequency transmission peak is due to the intrinsic vibration of thin film air column system. The coupling of the two systems affects the transmission valley and the high frequency transmission peak. More importantly, the two transmission peaks can be independently controlled by two systems. This is easy to achieve a sound shielding and double-pass filtering acoustic device. 3. The fourth chapter mainly introduces the research work on the harmonic effect of nonlinear collision. In this paper, the phenomenon of acoustic chaos in ultrasonic far infrared nondestructive testing (NDT) is introduced briefly, and then the research model and finite element analysis model of subharmonics in nonlinear collisions are introduced. Then we present a nonlinear collision harmonic frequency model, and we use the PE ring-aluminum block resonance system we constructed to impact the metal plate instead of the variable amplitude bar. The aluminum block system, another PE ring with different resonance frequencies, is used to replace the metal plate, so that the sound waves incident from different resonance system directions will produce more abundant physical effects. Finally, the model is analyzed and processed by ANSYS. The fifth chapter is about the work of this paper and the prospect of future work.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN65
本文編號：2285276
[Abstract]:In this paper, the structure and performance of new acoustic devices are mainly studied. The whole paper is divided into five chapters, except the introduction and summary and prospect of chapters-and 5. The main research work is divided into three parts: (1) the study of the supernormal transmission of the acoustic grid structure with the substrate; (2) the study of the double pass filtering characteristics of the coupled resonance system; (3) the harmonic frequency divider based on nonlinear collision. The brief contents of each part are as follows: 1. Study on the supernormal transmission of the subwavelength slotted structure the phenomenon of supernormal transmission occurs when the light waves pass through the subwavelength slit as well as the acoustic waves. In the first chapter, the research progress of supernormal transmission of acoustic grid structure is briefly introduced. Compared with the excitation of plasma in grating lattice, the supernormal transmission of acoustic grid is due to the excitation of transversely coupled resonance mode sound waves in the grid. The superstructure of the grid structure has good applications in acoustic collimation, unidirectional transmission and so on. In the second chapter, the unidirectional flow characteristics of the sonic grid structure with a substrate are briefly introduced, and it is pointed out that the one-way transmission is due to the sound wave being redistributed as a periodic source to excite the bending mode of the substrate, which radiates the sound wave. Then the transmission effect of sound field in the band gap domain is enhanced by changing the filling liquid between the grid and the film. Then the transmission effect of non-collimating incidence of sound wave is studied. It is found that the negative transmission effect will occur when the acoustic wave is not collimated and the propagation diagram of the acoustic field with negative transmission at different incidence angles is given. Finally, it is pointed out that the acoustic grid structure with a substrate has a good acoustic divergence effect in the case of non-collimating incidence. Study on Dual-pass filtering characteristics of coupled Resonance system; Acoustic superstructure materials have local resonance characteristics, which can lead to dynamic negative effective mass or negative elastic modulus, even double negative materials. This kind of acoustic superstructure material with negative parameters has good performance in supersonic lens and plate acoustic focusing. The research progress and development of local resonance acoustic superstructure materials can be found in Chapter 1 of this paper. In the third chapter, the research status of thin film acoustic superstructure materials is briefly introduced. Then we propose the double coupling resonance system, the PE ring aluminum block resonance system and the thin film air column system. Such a double coupling resonance system has the characteristic of double pass filter. The local velocity vibration image proves that the low frequency transmission peak is due to the intrinsic vibration of thin film air column system. The coupling of the two systems affects the transmission valley and the high frequency transmission peak. More importantly, the two transmission peaks can be independently controlled by two systems. This is easy to achieve a sound shielding and double-pass filtering acoustic device. 3. The fourth chapter mainly introduces the research work on the harmonic effect of nonlinear collision. In this paper, the phenomenon of acoustic chaos in ultrasonic far infrared nondestructive testing (NDT) is introduced briefly, and then the research model and finite element analysis model of subharmonics in nonlinear collisions are introduced. Then we present a nonlinear collision harmonic frequency model, and we use the PE ring-aluminum block resonance system we constructed to impact the metal plate instead of the variable amplitude bar. The aluminum block system, another PE ring with different resonance frequencies, is used to replace the metal plate, so that the sound waves incident from different resonance system directions will produce more abundant physical effects. Finally, the model is analyzed and processed by ANSYS. The fifth chapter is about the work of this paper and the prospect of future work.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN65
【共引文獻(xiàn)】
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2 方興;基于嚴(yán)格耦合波分析的一維微尺度光柵結(jié)構(gòu)輻射特性研究[D];哈爾濱工業(yè)大學(xué);2012年
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