Pub Date : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019253
Sheng-guo Li, Hong-lang Li, Zihao Li, Yu-ling Wang, Yao Liu, Taotao Chen, Song-ling Tan, Zheng Su, Min Gao, Fei Jiang
The gas pressure regulator (GPR) is an important equipment in the gas pipeline network and fault detection of the gas pressure regulator is essential. Recently, an acoustic-emission-based method has been proposed for gas pressure regulator fault detection, while the single-channel signal of the regulator is mixed-signal due to the vibration of other components like pipes and pilot. In this paper, a single channel blind source separation (SCBSS) algorithm based on ensemble empirical mode decomposition (EEMD) and fast independent component analysis (FastICA) is introduced for gas regulators’ acoustic emission signal. The algorithm can solve the problem of mixed-signal and recover the source signal of GPR. The degree of the signals’ frequency center (FC) change when fault occurs evaluates the performance of algorithm. The experimental result show that it has been improved 53.06%, from 294Hz to 450Hz.
{"title":"Single Channel Blind Source Separation for Gas Regulators’ Acoustic Signal Using Eemd-Fastica","authors":"Sheng-guo Li, Hong-lang Li, Zihao Li, Yu-ling Wang, Yao Liu, Taotao Chen, Song-ling Tan, Zheng Su, Min Gao, Fei Jiang","doi":"10.1109/SPAWDA48812.2019.9019253","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019253","url":null,"abstract":"The gas pressure regulator (GPR) is an important equipment in the gas pipeline network and fault detection of the gas pressure regulator is essential. Recently, an acoustic-emission-based method has been proposed for gas pressure regulator fault detection, while the single-channel signal of the regulator is mixed-signal due to the vibration of other components like pipes and pilot. In this paper, a single channel blind source separation (SCBSS) algorithm based on ensemble empirical mode decomposition (EEMD) and fast independent component analysis (FastICA) is introduced for gas regulators’ acoustic emission signal. The algorithm can solve the problem of mixed-signal and recover the source signal of GPR. The degree of the signals’ frequency center (FC) change when fault occurs evaluates the performance of algorithm. The experimental result show that it has been improved 53.06%, from 294Hz to 450Hz.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121235901","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}
Pub Date : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019228
Zhi-ying Liu, Juan Huang, Shou-guo Yan, Bi-xing Zhang
According to the Mason’s equivalent circuit of piezoelectric thickness-mode transducer, transmission line theory and high field dielectric behavior, a nonlinear PSPICE equivalent circuit model was proposed in this paper. This model can reflect the dielectric loss and simulate the nonlinearity of piezoelectric transducer under high electric field by building variable capacitor and resistor, whose values are affected by the level of the input exciting voltage. By establishing the nonlinear equivalent circuit model of high-power piezoelectric transducers in PSPICE tool, the nonlinear characteristic of the transducers under high voltage excitation were analyzed, and impedance matching was carried out, so as to improve the frequency response and bandwidth of the transducers in nonlinear conditions.
{"title":"Research on Nonlinear Equivalent Circuit of High Power Piezoelectric Transducer","authors":"Zhi-ying Liu, Juan Huang, Shou-guo Yan, Bi-xing Zhang","doi":"10.1109/SPAWDA48812.2019.9019228","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019228","url":null,"abstract":"According to the Mason’s equivalent circuit of piezoelectric thickness-mode transducer, transmission line theory and high field dielectric behavior, a nonlinear PSPICE equivalent circuit model was proposed in this paper. This model can reflect the dielectric loss and simulate the nonlinearity of piezoelectric transducer under high electric field by building variable capacitor and resistor, whose values are affected by the level of the input exciting voltage. By establishing the nonlinear equivalent circuit model of high-power piezoelectric transducers in PSPICE tool, the nonlinear characteristic of the transducers under high voltage excitation were analyzed, and impedance matching was carried out, so as to improve the frequency response and bandwidth of the transducers in nonlinear conditions.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116312642","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}
Pub Date : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019319
Liang Feng, Shu-shu Si, Xu Yan, Xiao-long Mei
In order to reduce the influence of the sample edge diffraction on the sound absorption coefficient testing of the panel material, the acoustic performance of the parametric array source with the oblique incidence of the panel material sample is explored in this paper. By studying the acoustic scattering energy of different test frequencies and incident azimuths of sample under finite beam width excitation, the oblique absorption coefficient of the samples is obtained according to the principle of energy conservation. The simulation calculation and experimental research shows that the high directivity of the parametric array source can effectively reduce the edge diffraction for the finite-size sample, and verifies the feasibility of obtaining the sound absorption coefficient by measuring the scattering energy.
{"title":"The Research About Acoustic Characterization of Panel Materials Using A Parametric Array Source","authors":"Liang Feng, Shu-shu Si, Xu Yan, Xiao-long Mei","doi":"10.1109/SPAWDA48812.2019.9019319","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019319","url":null,"abstract":"In order to reduce the influence of the sample edge diffraction on the sound absorption coefficient testing of the panel material, the acoustic performance of the parametric array source with the oblique incidence of the panel material sample is explored in this paper. By studying the acoustic scattering energy of different test frequencies and incident azimuths of sample under finite beam width excitation, the oblique absorption coefficient of the samples is obtained according to the principle of energy conservation. The simulation calculation and experimental research shows that the high directivity of the parametric array source can effectively reduce the edge diffraction for the finite-size sample, and verifies the feasibility of obtaining the sound absorption coefficient by measuring the scattering energy.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126762534","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}
As surface acoustic wave (SAW) sensor has wireless and passive characteristics , the traditional time-of-flight location method is greatly affected by the path loss, and thus the location accuracy is low. In order to improve the location accuracy, a Kalman algorithm considering path loss is proposed. Combining with the path loss model, the relationship between the variance of location error and the detection distance is derived. Based on this relationship, the observation equation of the Kalman algorithm is modified, and also the Kalman algorithm with noise variance varying with distance is obtained. The simulation results show that the location variance of the traditional location algorithm is 0 ~ 1.78cm when the detection distance is within 1.5m, and the location variance of this method is 0 ~ 0.41cm. Compared with the traditional location algorithm, the accuracy of this method improves about 4 times, which verifies the reliability of this algorithm.
{"title":"Localization Using Saw Rfid Sensor Based on Kalman Algorithm","authors":"Rui-xin Han, Hong-lang Li, Zixiao Lu, Yabing Ke, Yahui Tian","doi":"10.1109/SPAWDA48812.2019.9019255","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019255","url":null,"abstract":"As surface acoustic wave (SAW) sensor has wireless and passive characteristics , the traditional time-of-flight location method is greatly affected by the path loss, and thus the location accuracy is low. In order to improve the location accuracy, a Kalman algorithm considering path loss is proposed. Combining with the path loss model, the relationship between the variance of location error and the detection distance is derived. Based on this relationship, the observation equation of the Kalman algorithm is modified, and also the Kalman algorithm with noise variance varying with distance is obtained. The simulation results show that the location variance of the traditional location algorithm is 0 ~ 1.78cm when the detection distance is within 1.5m, and the location variance of this method is 0 ~ 0.41cm. Compared with the traditional location algorithm, the accuracy of this method improves about 4 times, which verifies the reliability of this algorithm.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128243852","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}
Pub Date : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019290
Yuan-rui Xu, Yuanzi Ma, Yong Yang, Zai-lin Yang
The problem of the scattering of SH waves by a circular inclusion in the two-dimensional inhomogeneous medium is discussed in this paper. Based on the conformal mapping technique, the Helmholtz equation with variable coefficients is transferred into its standard form. Besides, the dynamic response is calculated and discussed. Numerical results present that DSCF is influenced by wave number and inhomogeneous parameter.
{"title":"Dynamic Analysis of a Circular Inclusion in Inhomogeneous Medium Subjected to SH Waves","authors":"Yuan-rui Xu, Yuanzi Ma, Yong Yang, Zai-lin Yang","doi":"10.1109/SPAWDA48812.2019.9019290","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019290","url":null,"abstract":"The problem of the scattering of SH waves by a circular inclusion in the two-dimensional inhomogeneous medium is discussed in this paper. Based on the conformal mapping technique, the Helmholtz equation with variable coefficients is transferred into its standard form. Besides, the dynamic response is calculated and discussed. Numerical results present that DSCF is influenced by wave number and inhomogeneous parameter.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128435228","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}
Pub Date : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019248
Guangda Wu, L. Kong, Mengdi Fan, Chao Jiang, F. Yu, Xian Zhao
The yttrium strontium phosphate crystal YSr3(PO4)3 (YSP), a new multifunction crystals material with noncentrosymmetric characteristics, has been grown successfully by the Czochralski pulling technology in a short period (within one week). In this report, the electromechanical coupling factors, dielectric permittivity and dielectric losses of YSP crystal were evaluated by impedance method for potential piezoelectric applications. The dielectric loss was measured to be < 0.1% at room temperature while increased to 40% at 750 °C. The electromechanical coupling factor k14 at room temperature were determined to be on the order of 12.11% while slightly decreased to 9.73% at 850 °C. The YSP crystal might be an important piezoelectric crystal material for high temperature application.
{"title":"Crystal Growth and Electro-Elastic Property Characterization of Yttrium Strontium Phosphate","authors":"Guangda Wu, L. Kong, Mengdi Fan, Chao Jiang, F. Yu, Xian Zhao","doi":"10.1109/SPAWDA48812.2019.9019248","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019248","url":null,"abstract":"The yttrium strontium phosphate crystal YSr3(PO4)3 (YSP), a new multifunction crystals material with noncentrosymmetric characteristics, has been grown successfully by the Czochralski pulling technology in a short period (within one week). In this report, the electromechanical coupling factors, dielectric permittivity and dielectric losses of YSP crystal were evaluated by impedance method for potential piezoelectric applications. The dielectric loss was measured to be < 0.1% at room temperature while increased to 40% at 750 °C. The electromechanical coupling factor k14 at room temperature were determined to be on the order of 12.11% while slightly decreased to 9.73% at 850 °C. The YSP crystal might be an important piezoelectric crystal material for high temperature application.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126984509","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}
Pub Date : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019331
Yingming Shen, Jie Hu, Bianfang Zhang, X. Fang
Fe2O3 nanopowders were prepared by solid phase reaction method. The phase structure, microstructure, magnetic properties and gas sensor properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), vibration sample magnetometer (VSM) and gas sensor measuring system. It was found that the precursor sintered at 300 °C was spinel structure and transformed into α-Fe2O3 above 400 °C. The results of the room temperature hysteresis loops showed that the results obtained from the magnetic hystersis loop at room temperature were in agreement with those from the XRD spectra. Moreover, it was shown that γ-Fe2O3 can be used as gas sensor of the alcohol. he α-Fe2O3 nanopowders can be obtained at a lower sintering temperature. In addition, the gas sensor of γ-Fe2O3 was more sensitive to the alcohol.
{"title":"Study on Preparation and Physical Properties of Fe2O3 Nanopowders","authors":"Yingming Shen, Jie Hu, Bianfang Zhang, X. Fang","doi":"10.1109/SPAWDA48812.2019.9019331","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019331","url":null,"abstract":"Fe<inf>2</inf>O<inf>3</inf> nanopowders were prepared by solid phase reaction method. The phase structure, microstructure, magnetic properties and gas sensor properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), vibration sample magnetometer (VSM) and gas sensor measuring system. It was found that the precursor sintered at 300 °C was spinel structure and transformed into α-Fe<inf>2</inf>O<inf>3</inf> above 400 °C. The results of the room temperature hysteresis loops showed that the results obtained from the magnetic hystersis loop at room temperature were in agreement with those from the XRD spectra. Moreover, it was shown that γ-Fe<inf>2</inf>O<inf>3</inf> can be used as gas sensor of the alcohol. he α-Fe<inf>2</inf>O<inf>3</inf> nanopowders can be obtained at a lower sintering temperature. In addition, the gas sensor of γ-Fe<inf>2</inf>O<inf>3</inf> was more sensitive to the alcohol.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130711840","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}
In this work, the laser interferometric method was used to evaluate the piezoelectric coefficients of crystals in trigonal symmetry, such as LiNbO3 (LN) and La3Ga5.5Ta0.5O14 (LGT) crystals. Taking advantage of the high sensitivity of Michelson interferometric, when the piezoelectric crystal deformed at the nanoscale under the applied electric field, the interferometric fringe will change correspondingly, thus amplifying the tiny deformation of the piezoelectric crystals. Compared to the traditional impedance method and ultrasonic method, the laser interferometric method could realize direct measurement and confirm the positive or negative sign of piezoelectric coefficients. The independent piezoelectric coefficients were evaluated to be d11=6.9 pC/N, d14=5.0 pC/N for trigonal LGT crystal, and d21=-22.8 pC/N, d31=0.87 pC/N, d33=10.2 pC/N, and d16=71.2 pC/N for trigonal LN crystal. The laser interferometric method can be applied for determining the independent piezoelectric coefficients for non-centrosymmetric crystal materials.
{"title":"Determining the Independent Piezoelectric Coefficients Using Laser Interferometric Method","authors":"Fang-lin Li, Shi-wei Tian, Guangda Wu, Chao Jiang, F. Yu, Xian Zhao","doi":"10.1109/SPAWDA48812.2019.9019223","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019223","url":null,"abstract":"In this work, the laser interferometric method was used to evaluate the piezoelectric coefficients of crystals in trigonal symmetry, such as LiNbO3 (LN) and La3Ga5.5Ta0.5O14 (LGT) crystals. Taking advantage of the high sensitivity of Michelson interferometric, when the piezoelectric crystal deformed at the nanoscale under the applied electric field, the interferometric fringe will change correspondingly, thus amplifying the tiny deformation of the piezoelectric crystals. Compared to the traditional impedance method and ultrasonic method, the laser interferometric method could realize direct measurement and confirm the positive or negative sign of piezoelectric coefficients. The independent piezoelectric coefficients were evaluated to be d11=6.9 pC/N, d14=5.0 pC/N for trigonal LGT crystal, and d21=-22.8 pC/N, d31=0.87 pC/N, d33=10.2 pC/N, and d16=71.2 pC/N for trigonal LN crystal. The laser interferometric method can be applied for determining the independent piezoelectric coefficients for non-centrosymmetric crystal materials.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130378411","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}
Pub Date : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019244
Shuai Zhu, Hai‐Tao Liu
Functionally graded piezoelectric materials (FGPMs) are widely used in aerospace, military and other fields. The present paper is concerned with the stress, electric displacement and electric field strength around the multiple cracks of FGPMs subjected to mechanical field. Based on the constitutive relations, geometric relations and boundary conditions of FGPMs, the material parameters of the FGPMs are calculated by the layering method with continuous properties along the gradient direction in the model. The numerical calculation results show that the type of cracks distribution, the distance between the cracks, the crack size, the angle between the cracks are important factors in FGPMs plate. Furthermore, through the study of FGPMs under the mechanical field, the fracture parameters around the cracks can be used as a reference for the service life of FGPMs.
{"title":"Fracture Analysis of Multiple Cracks in Functionally Graded Piezoelectric Materials Based on Layering Method","authors":"Shuai Zhu, Hai‐Tao Liu","doi":"10.1109/SPAWDA48812.2019.9019244","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019244","url":null,"abstract":"Functionally graded piezoelectric materials (FGPMs) are widely used in aerospace, military and other fields. The present paper is concerned with the stress, electric displacement and electric field strength around the multiple cracks of FGPMs subjected to mechanical field. Based on the constitutive relations, geometric relations and boundary conditions of FGPMs, the material parameters of the FGPMs are calculated by the layering method with continuous properties along the gradient direction in the model. The numerical calculation results show that the type of cracks distribution, the distance between the cracks, the crack size, the angle between the cracks are important factors in FGPMs plate. Furthermore, through the study of FGPMs under the mechanical field, the fracture parameters around the cracks can be used as a reference for the service life of FGPMs.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132488891","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}
Pub Date : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019221
Xianhui Wang, Yu-jian Liu, Jiangong Yu, Hui Qiao
The governing equation of Lamb wave propagation and defect interaction is the wave equation in elastodynamics. The boundary element method (BEM) is suitable choice to solve scattering problems in infinite domain. Based on the Contour integral theorem, analytical expressions of singular integral were obtained in in finite part. In this paper, analytical integration of strongly singular boundary integrals equations with constant element for 2D elastodynamics BEM with constant elements. All the singular and strongly integrals can be analytical evaluation in finite part sense when the constant elements are applied to discretize the boundary. The contour integral is used to solve the singular and strongly integrals. The validity of the presented formulas has been demonstrated by the numerical examples.
{"title":"Study of Boundary Element Method for Lamb Wave Propagation and Defect Interaction Problems","authors":"Xianhui Wang, Yu-jian Liu, Jiangong Yu, Hui Qiao","doi":"10.1109/SPAWDA48812.2019.9019221","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019221","url":null,"abstract":"The governing equation of Lamb wave propagation and defect interaction is the wave equation in elastodynamics. The boundary element method (BEM) is suitable choice to solve scattering problems in infinite domain. Based on the Contour integral theorem, analytical expressions of singular integral were obtained in in finite part. In this paper, analytical integration of strongly singular boundary integrals equations with constant element for 2D elastodynamics BEM with constant elements. All the singular and strongly integrals can be analytical evaluation in finite part sense when the constant elements are applied to discretize the boundary. The contour integral is used to solve the singular and strongly integrals. The validity of the presented formulas has been demonstrated by the numerical examples.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131294281","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}
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