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Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications最新文献

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Research on lossless compression coding of ultrasonic log data 超声测井数据无损压缩编码研究
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998521
Jun-Jun Yao, Peng-lai Xin, Qi-Jiao Yu, Hong He
{"title":"Research on lossless compression coding of ultrasonic log data","authors":"Jun-Jun Yao, Peng-lai Xin, Qi-Jiao Yu, Hong He","doi":"10.1109/SPAWDA.2014.6998521","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998521","url":null,"abstract":"Large amounts of data are transported to the ground in the process of logging and limitations of cable bandwidth, so ultrasonic log data need to be compressed in the downhole when logging. In this case, this paper put forward a new lossless coding structure UWLC to compress the ultrasonic logging data. This structure of UWLC is designed to encode the data to close achieve the effect of envelope detection. The UWLC has a strong ability to track data amplitude. In ultrasonic log data compression case, comparing to traditional Golomb-rice, adaptive Golomb-rice and LZW compression algorithms, UWLC has higher compression ratio.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115227131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Resonant modal analysis of the two-dimensional phononic crysals transducers 二维声子晶体换能器的共振模态分析
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998609
Hong-lang Li, Wen-jia Tian, Yahui Tian, Xiao-xi Li, Yong-qiang Bai, S. He
{"title":"Resonant modal analysis of the two-dimensional phononic crysals transducers","authors":"Hong-lang Li, Wen-jia Tian, Yahui Tian, Xiao-xi Li, Yong-qiang Bai, S. He","doi":"10.1109/SPAWDA.2014.6998609","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998609","url":null,"abstract":"A three-dimensional (3D) finite element method (FEM) model was proposed to analyze the resonant modal of the transducers based on two-dimensional (2D) phononic crystals (PnCs). Using this model two modals existed with symmetric modal and anti-symmetric modal can be extracted, and then reflectivity of the transducers was derived. An example of transducer based on 2D PnCs composed of IDTs of aluminum strips and tungsten stubs on top of IDTs was analyzed. The calculated reflectivity with different thickness of the stubs shows that a optimal thickness of tungsten stubs exists for a specified IDTs. This modal analysis offer a useful tool for the optimal designing 2D PnCs on the surface acoustic waves devices.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123681198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An analysis of free vibrations of isotropic, circular plates with the Mindlin plate theory 用明林板理论分析各向同性圆板的自由振动
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998608
Hui Chen, Ji Wang, T. Ma, Jianke Du
{"title":"An analysis of free vibrations of isotropic, circular plates with the Mindlin plate theory","authors":"Hui Chen, Ji Wang, T. Ma, Jianke Du","doi":"10.1109/SPAWDA.2014.6998608","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998608","url":null,"abstract":"We study non-axially symmetric vibrations of isotropic, circular plates with free edges. Mindlin's first-order equations governing the coupled thickness-shear, flexural, and thickness-twist modes are obtained for circular plates in cylindrical coordinates by following the derivation of Mindlin plate equations in Cartesian coordinates. The equations are successfully solved by Bessel functions. Numerical results for dispersion relations, frequency spectra, and mode shapes are obtained as parts of the validation and solution procedure. The calculated results of frequency spectra are in good agreement with Mindlin's earlier studies. It is our first step to analyze high frequency vibrations of circular plates in a systematic manner for applications in circular quartz crystal resonators.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128587328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Effect of an imperfect interface on the SH wave in a cylindrically piezoelectirc/piezomagnetic composite 不完美界面对圆柱压电/压磁复合材料中SH波的影响
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998576
W. Sun, G. Ju, B. Yang
{"title":"Effect of an imperfect interface on the SH wave in a cylindrically piezoelectirc/piezomagnetic composite","authors":"W. Sun, G. Ju, B. Yang","doi":"10.1109/SPAWDA.2014.6998576","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998576","url":null,"abstract":"SH wave propagation in a cylindrically layered magneto-electric-elastic composite consisting of a piezoelectric layer and a piezomagnetic central cylinder. Based on the spring-type relation, the imperfectly bonded interface is assumed to be damaged mechanically, magnetically and/or electrically. The magneto-electrically open and shorted conditions at the free surface are taken to solve the problem. The dispersion relations of SH wave can be derived and the phase velocity are obtained numerically. Our results show that the mechanical imperfection may remarkably reduce the phase velocity under certain circumstances. However, the magneto-electrical imperfection has no obvious effect on the phase velocity in any cases. These findings are useful for the design of resonators and other microwave devices.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114336675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design of a class-E inverter for piezoelectric ultrasound generation against load variation e类压电超声发生器抗负载变化逆变器的设计
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998540
Hai-li Liu, Jun-rui Liang
{"title":"Design of a class-E inverter for piezoelectric ultrasound generation against load variation","authors":"Hai-li Liu, Jun-rui Liang","doi":"10.1109/SPAWDA.2014.6998540","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998540","url":null,"abstract":"Piezoelectric transducers are used for generating ultrasound around their resonant frequencies. Single-ended class-E resonant inverter has a simple configuration and high conversion efficiency; therefore, was investigated for driving piezoelectric transducer for ultrasound generation. However, both piezoelectric transducer and class-E circuit are sensitive to load variation. This paper studies the susceptibility of output power and conversion efficiency of a class-E based piezoelectric ultrasound generator under different load conditions. By using the iteration-free extended impedance method, the integration of class-E inverter and piezoelectric transducer can be efficiently analyzed; parameters can be properly designed and optimized. An in-situ adapting approach, which tunes the duty ratio and dc supply voltage for maximizing the conversion efficiency at constant output power against load variation, is investigated. Simulation results show that, by taking this parameter tuning, the susceptibility of output power and conversion efficiency can be alleviated within a wide range of load.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"148-149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124042123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Bridgman growth and characterization of the structure ordered CTGS single crystal 结构有序CTGS单晶的Bridgman生长与表征
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998572
He-wei Wang, F. Yu, Shuai Hou, Feifei Chen, Jie Zhan, Xian Zhao
{"title":"Bridgman growth and characterization of the structure ordered CTGS single crystal","authors":"He-wei Wang, F. Yu, Shuai Hou, Feifei Chen, Jie Zhan, Xian Zhao","doi":"10.1109/SPAWDA.2014.6998572","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998572","url":null,"abstract":"Structural ordered langasite-type piezoelectric crystal Ca3Ta G a 3Si2O14(CTGS) possess excellent high temperature piezoelectric properties. In this work, large size(25mm in diameter and 80mm in length)CTGS single crystalswere grown by using the vertical Bridgman method. High resolution X-ray diffraction technique was applied to characterize the crystal quality, where the as-grown CTGS crystals were found to show low FWHM value, being on the order of<;50\", indicating the high quality of the CTGS crystals. In addition, the temperature dependent behaviours for the elastic and piezoelectric properties were investigated from 20°C to 900°C, where piezoelectric coefficient d11(-d12) was found to increase with temperature with variation less than 30%, while the variation of the elastic compliance s22 was obtained to be <;10% over the test temperature range, similar to the CTGS crystals grown by using Czochralski method. All these results indicated that Bridgman method is an alternative to Czochralski method for high quality CTGS crystal growth.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"356 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132602955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on propagation characteristics of guided wave in rail excited by low-frequency piezoelectric transducer 低频压电换能器激励导波在轨道中的传播特性研究
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998623
Yusen Huo, Di Wu, Deng Wei, Hua Xue, Ya-ping Wang, Yong-ping Teng
{"title":"Research on propagation characteristics of guided wave in rail excited by low-frequency piezoelectric transducer","authors":"Yusen Huo, Di Wu, Deng Wei, Hua Xue, Ya-ping Wang, Yong-ping Teng","doi":"10.1109/SPAWDA.2014.6998623","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998623","url":null,"abstract":"This short paper introduced the piezoelectric sandwich transducer and obtained the vibration ratio between the front and back metal covers according to the electromechanical equivalent circuit derived by force and electric analogy method. The transducer's resonance frequency is calculated using MATLAB programming, following by an experiment performed on a 1.5m long 50kg / m rail under laboratory conditions. The rail's equivalent damped loss factor was measured and the attenuation curve was plotted using a sandwich transducer and a 352C33 low frequency acceleration sensor as excitation and receiving units respectively.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131061498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The asymmetrical transmission characteristics of shear horizontal guided wave in an asymmetricalstructure 剪切水平导波在非对称结构中的不对称传播特性
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998606
Jiujiu Chen, Guang-huang Song, Sheng-tao Yi, Xu Han
{"title":"The asymmetrical transmission characteristics of shear horizontal guided wave in an asymmetricalstructure","authors":"Jiujiu Chen, Guang-huang Song, Sheng-tao Yi, Xu Han","doi":"10.1109/SPAWDA.2014.6998606","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998606","url":null,"abstract":"The cut-off frequency of higher modes of shear horizontal (SH) guided wave propagating in a plate depends on the thickness due to dispersive characteristic. Through numerical simulation of the first higher (SH1) mode of SH guided wave propagation in an asymmetric structure, we have realized sound unidirectional transmission based on breaking spatial inversion symmetry. It demonstrated that when the SH1 mode are launched into the system from the left side, it mostly converts to the fundamental mode in the defected region and attain a high transmission; on the contrary, when the waves are incident from the right side, the conversion is weak, most SH1 mode is reflected and the transmission is low. This asymmetric system should be potentially significant in putting to good use in a variety of applications.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133278566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Robust minimun variance beamforming applied to ultrasound imaging in the presence of phase aberration 鲁棒最小方差波束成形在相位像差存在下的超声成像应用
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998541
Xin-yuan Xia, Ping Li, Wen-tao Wu, Xiaohui Meng
{"title":"Robust minimun variance beamforming applied to ultrasound imaging in the presence of phase aberration","authors":"Xin-yuan Xia, Ping Li, Wen-tao Wu, Xiaohui Meng","doi":"10.1109/SPAWDA.2014.6998541","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998541","url":null,"abstract":"Minimum variance (MV) adaptive beamforming has been applied in medical ultrasound imaging to improve lateral resolution, but standard MV method is quite sensitive to the perturbation of the received signal. Due to the inhomogeneity of human tissues, sound speed varies and there exists a certain amount of time-delay error for each channel which is referred to as phase aberration. A robust minimum variance adaptive beamforming method was proposed in order to avoid significant degradation under more practical circumstances. The sample covariance matrix was reconstructed with a forward-backward method. And the steering vector was estimated via maximizing the output beamformer power, which was turned into a quadratic convex optimization problem with proper constraints. The simulations with Field II showed that the proposed method was robust in the presence of phase aberration and could maintain its performance for improving imaging quality.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133212114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Dynamic inhomogeneous finite element method for dynamic response analysis of the 1D inhomogeneous media with the variable section area 一维变截面非均匀介质动力响应分析的动力非均匀有限元法
Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2014-12-29 DOI: 10.1109/SPAWDA.2014.6998610
Yao Wang, Zai-lin Yang, Bao-ping Hei
{"title":"Dynamic inhomogeneous finite element method for dynamic response analysis of the 1D inhomogeneous media with the variable section area","authors":"Yao Wang, Zai-lin Yang, Bao-ping Hei","doi":"10.1109/SPAWDA.2014.6998610","DOIUrl":"https://doi.org/10.1109/SPAWDA.2014.6998610","url":null,"abstract":"Dynamic response problem in the inhomogeneous media is a hot topic. In this paper, dynamic inhomogeneous finite element formulations are given for dynamic response analysis of 1D inhomogeneous medium with variable section area. The dynamic equilibrium equation is given first. Then, the equation's weak formation is derived by weight residual method. The expressions of inhomogeneous element stiffness and mass matrices are observed. Then, two equivalent relationships about stiffness and mass are presented. The same equivalent coefficients, initial and boundary conditions lead to the same response solution. In addition, the results of the example show that this dynamic inhomogeneous finite element approach has a high degree of accuracy and high efficiency.","PeriodicalId":412736,"journal":{"name":"Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115607368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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