Pub Date : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364526
Xian Fu, Jianke Du, J. Lou, Ji Wang, T. Ma, Bin Huang, Lijun Yi
According to the linear piezoelectric theory, the frequency equation of thickness shear vibration is obtained for investigating the ZnO thin film with a layer of viscoelastic media. Fortunately, some useful results are harvested. From these results, we find that the relative resonant frequency significantly increases when the viscous coefficient is in the range of 0-2Ns/m2. The relation between the relative resonant frequency and the density and thickness of the viscoelastic media also has been discussed. These need to be considered in the design of resonators.
{"title":"Analyzing thickness shear vibration of ZnO thin film with a viscoelastic layer","authors":"Xian Fu, Jianke Du, J. Lou, Ji Wang, T. Ma, Bin Huang, Lijun Yi","doi":"10.1109/SPAWDA.2015.7364526","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364526","url":null,"abstract":"According to the linear piezoelectric theory, the frequency equation of thickness shear vibration is obtained for investigating the ZnO thin film with a layer of viscoelastic media. Fortunately, some useful results are harvested. From these results, we find that the relative resonant frequency significantly increases when the viscous coefficient is in the range of 0-2Ns/m2. The relation between the relative resonant frequency and the density and thickness of the viscoelastic media also has been discussed. These need to be considered in the design of resonators.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131386351","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 : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364522
Y. Wang, Zi-heng Nie, Jimei Wu, Qiumin Wu
The nonlinear vibration characteristics and stability of the printing moving film is studied. The transverse vibration differential equation is derived according to the D'Alembert principle and dispersed by using the differential quadrature method. The stability of an axially moving film under variable tension is studied based on the Floquet theory. The large deflection vibration equation of axially moving film is deduced based on the theory of elasticity, large deflection vibration of the moving rectangle film under clamped boundary is studied by semi-analytic weighted residual method namely Bubnov-Galerkin method, and the frequency of nonlinear large deflection vibration is calculated.
{"title":"Study of nonlinear vibration characteristics and stability of printing moving film","authors":"Y. Wang, Zi-heng Nie, Jimei Wu, Qiumin Wu","doi":"10.1109/SPAWDA.2015.7364522","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364522","url":null,"abstract":"The nonlinear vibration characteristics and stability of the printing moving film is studied. The transverse vibration differential equation is derived according to the D'Alembert principle and dispersed by using the differential quadrature method. The stability of an axially moving film under variable tension is studied based on the Floquet theory. The large deflection vibration equation of axially moving film is deduced based on the theory of elasticity, large deflection vibration of the moving rectangle film under clamped boundary is studied by semi-analytic weighted residual method namely Bubnov-Galerkin method, and the frequency of nonlinear large deflection vibration is calculated.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133897839","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 : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364506
Hai-Bing Yang, C. Gao
Based on the complex potential method and linear-elastic piezoelectric constitutive equation, the anti-plane problems of a piezoelectric inclusion with an elliptic hole or crack in an infinite piezoelectric matrix are studied. Firstly, by using the conformal transformation and Taylor series, the complex potential functions in the piezoelectric matrix and inclusion are given, respectively, in form of series. Secondly, the unknown coefficients are obtained in terms of the boundary conditions. Finally, the electric and stress fields of the piezoelectric matrix and inclusion are solved. The numerical results show that the field intensity factors changes along with the material constants of the matrix and inclusion. It is also found that for the “soft inclusion”, the field intensity factors decrease with the increase of the size ratio between the crack and inclusion, and for the “hard inclusion”, the field intensity factors increase with the increase of the size ratio between the crack and inclusion.
{"title":"Anti-plane problems of a piezoelectric inclusion with an elliptic hole or a crack in an infinite piezoelectric matrix","authors":"Hai-Bing Yang, C. Gao","doi":"10.1109/SPAWDA.2015.7364506","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364506","url":null,"abstract":"Based on the complex potential method and linear-elastic piezoelectric constitutive equation, the anti-plane problems of a piezoelectric inclusion with an elliptic hole or crack in an infinite piezoelectric matrix are studied. Firstly, by using the conformal transformation and Taylor series, the complex potential functions in the piezoelectric matrix and inclusion are given, respectively, in form of series. Secondly, the unknown coefficients are obtained in terms of the boundary conditions. Finally, the electric and stress fields of the piezoelectric matrix and inclusion are solved. The numerical results show that the field intensity factors changes along with the material constants of the matrix and inclusion. It is also found that for the “soft inclusion”, the field intensity factors decrease with the increase of the size ratio between the crack and inclusion, and for the “hard inclusion”, the field intensity factors increase with the increase of the size ratio between the crack and inclusion.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133692126","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 : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364492
M. Cui, Rui-biao Guo, Shu Xue, Yong-chuan Li, M. Qian
In this paper, each parameter affecting the performance of spherical ultrasonic transducer is simulated by a reasonable finite element model (FEM), and optimal design parameters are obtained for a 50MHz spherical ultrasonic transducer. Simulation results show that the ceramic thickness of spherical ultrasonic transducer is calculated to be 40.9um and the center frequency is 50MHz; The radius for spherical aperture is 550um and the vibration mode is single; The acoustic performance is greatly impacted by the radius of spherical curvature, so the best radius of spherical curvature should be less than the radius of ceramic aperture, and the focal spot of the acoustic field and the sensitivity of the transducer can be improved; Adding an acoustic matching layer can improve the transmission capacity and the sound field focused energy, and the best matching layer thickness is approximately 13.5um.
{"title":"The finite element simulation and design of a 50MHz spherical ultrasonic transducer","authors":"M. Cui, Rui-biao Guo, Shu Xue, Yong-chuan Li, M. Qian","doi":"10.1109/SPAWDA.2015.7364492","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364492","url":null,"abstract":"In this paper, each parameter affecting the performance of spherical ultrasonic transducer is simulated by a reasonable finite element model (FEM), and optimal design parameters are obtained for a 50MHz spherical ultrasonic transducer. Simulation results show that the ceramic thickness of spherical ultrasonic transducer is calculated to be 40.9um and the center frequency is 50MHz; The radius for spherical aperture is 550um and the vibration mode is single; The acoustic performance is greatly impacted by the radius of spherical curvature, so the best radius of spherical curvature should be less than the radius of ceramic aperture, and the focal spot of the acoustic field and the sensitivity of the transducer can be improved; Adding an acoustic matching layer can improve the transmission capacity and the sound field focused energy, and the best matching layer thickness is approximately 13.5um.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131992166","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 : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364448
Liang Wang, C. Shu, Jiamei Jin, Jian-hui Zhang
A novel type piezoelectric tracked travelling system with potential application to planetary exploration is proposed. The tracked travelling system includes a piezoelectric transducer and a metal track. When the piezoelectric transducer is excited by two electric signals with a phase difference of π/2, the metal track will be driven by friction forces. Firstly, the design and operating principle of the tracked travelling system are presented in detail. Secondly, the operating modes of the piezoelectric transducer are analyzed by FEM and compared with the vibration measurement results. Thirdly, the prototype is manufactured and assembled, and the motion characteristics experiments of the system are carried out to valid the feasibility. When the voltage is 460V and the frequency is 65.2 kHz, the maximum velocity of the system can reach to 51.5mm/s. The results show that the tracked travelling system has a potential application in rover robots for planetary exploration.
{"title":"A tracked travelling system under the actuation of a piezoelectric transducer","authors":"Liang Wang, C. Shu, Jiamei Jin, Jian-hui Zhang","doi":"10.1109/SPAWDA.2015.7364448","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364448","url":null,"abstract":"A novel type piezoelectric tracked travelling system with potential application to planetary exploration is proposed. The tracked travelling system includes a piezoelectric transducer and a metal track. When the piezoelectric transducer is excited by two electric signals with a phase difference of π/2, the metal track will be driven by friction forces. Firstly, the design and operating principle of the tracked travelling system are presented in detail. Secondly, the operating modes of the piezoelectric transducer are analyzed by FEM and compared with the vibration measurement results. Thirdly, the prototype is manufactured and assembled, and the motion characteristics experiments of the system are carried out to valid the feasibility. When the voltage is 460V and the frequency is 65.2 kHz, the maximum velocity of the system can reach to 51.5mm/s. The results show that the tracked travelling system has a potential application in rover robots for planetary exploration.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114833869","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 : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364518
Ting-hai Cheng, Liang Wang, Pu He, Xiaoyu Liu, Dong Zhu
A travelling wave ultrasonic by the clutch coupling longitudinal and bending vibration modes is proposed to improve the output performance of the current ultrasonic clutch. The proposed ultrasonic clutch mechanism is a crucial component and it mainly includes a driving friction plate, a slave friction plate, driving and slave Langevin transducers, driving and driven shafts. The proposed ultrasonic clutch has the connection and disconnection function. In addition, a driving travelling wave is generated by compositing the longitudinal and bending vibration modes of transducer and friction plate for realizing the regulation of output performance. The matching frequencies of two vibration modes are obtained by modal simulation analysis using finite element method. A prototype of ultrasonic clutch is manufactured and the vibration characteristics are tested. The results indicate that the travelling wave ultrasonic clutch coupling by longitudinal and bending vibration modes is feasible.
{"title":"A travelling wave ultrasonic clutch by the coupling of longitudinal and bending vibration modes","authors":"Ting-hai Cheng, Liang Wang, Pu He, Xiaoyu Liu, Dong Zhu","doi":"10.1109/SPAWDA.2015.7364518","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364518","url":null,"abstract":"A travelling wave ultrasonic by the clutch coupling longitudinal and bending vibration modes is proposed to improve the output performance of the current ultrasonic clutch. The proposed ultrasonic clutch mechanism is a crucial component and it mainly includes a driving friction plate, a slave friction plate, driving and slave Langevin transducers, driving and driven shafts. The proposed ultrasonic clutch has the connection and disconnection function. In addition, a driving travelling wave is generated by compositing the longitudinal and bending vibration modes of transducer and friction plate for realizing the regulation of output performance. The matching frequencies of two vibration modes are obtained by modal simulation analysis using finite element method. A prototype of ultrasonic clutch is manufactured and the vibration characteristics are tested. The results indicate that the travelling wave ultrasonic clutch coupling by longitudinal and bending vibration modes is feasible.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116320521","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 : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364519
Yang Zhao, Jianwei Chen, Zhenzhen Zhang, Yin-nian Zhu
Noncontact laser ultrasonic methods are provided for nondestructive characterization of surface residual stress and thermally growth oxide (TGO) in thermal barrier coating (TBC). Stress-acoustic coefficients of Rayleigh wave were used to characterize the surface residual stresses of TBC specimens which were prepared by electronic beam physical vapor deposition (EB-PVD) method. The ultrasonic testing results of TBC specimens before and after oxidation with 1 time and 50 times agree well with the corresponding Raman spectral analyses. Meanwhile, a physical mode of thin multi-layered structure is established for the case of received ultrasonic longitudinal waveform consisting of reverberant overlapping echoes. Further, the transform function of the mode was derived to evaluate the TGO in this work. The experimental transform functions of TBC specimens above shows that the amplitude decreases at high order resonant frequencies with increase of TGO thickness. The proposed methods are able to nondestructively characterize the local surface stress and TGO in TBC, and are important to practical engineering application.
{"title":"Nondestructive evaluation of residual stress and TGO by using laser ultrasonic method","authors":"Yang Zhao, Jianwei Chen, Zhenzhen Zhang, Yin-nian Zhu","doi":"10.1109/SPAWDA.2015.7364519","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364519","url":null,"abstract":"Noncontact laser ultrasonic methods are provided for nondestructive characterization of surface residual stress and thermally growth oxide (TGO) in thermal barrier coating (TBC). Stress-acoustic coefficients of Rayleigh wave were used to characterize the surface residual stresses of TBC specimens which were prepared by electronic beam physical vapor deposition (EB-PVD) method. The ultrasonic testing results of TBC specimens before and after oxidation with 1 time and 50 times agree well with the corresponding Raman spectral analyses. Meanwhile, a physical mode of thin multi-layered structure is established for the case of received ultrasonic longitudinal waveform consisting of reverberant overlapping echoes. Further, the transform function of the mode was derived to evaluate the TGO in this work. The experimental transform functions of TBC specimens above shows that the amplitude decreases at high order resonant frequencies with increase of TGO thickness. The proposed methods are able to nondestructively characterize the local surface stress and TGO in TBC, and are important to practical engineering application.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134055076","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 : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364498
X. Yan, Z. Yao
In this paper, a new multi-degree-of-freedom (MDOF) ultrasonic motor is designed. The motor is composed of four rectangular vibrators which are arranged as the Chinese word `ten'. The stator is driven by a composite of bending vibrations in two orthogonal directions. In the design process, the finite element model is established to find the anti-symmetric and symmetric modes of the stator. Structural dimensions that affect modal frequencies are selected and optimized. Through harmonic response simulation, the running state of the stator under sinusoidal signal is obtained and results show bending vibration is preferred. According to the analysis results, a motor prototype is made. Flexible hinges are used to improve the motor structure at the connecting position. The prototype has good output characteristics and the speed of the rotor can reach 0.122r/s under 400V voltage. The new motor has a certain reference value in the research of MDOF ultrasonic motors.
{"title":"Structure design and finite element analysis of a new multi-degree-of-freedom ultrasonic motor","authors":"X. Yan, Z. Yao","doi":"10.1109/SPAWDA.2015.7364498","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364498","url":null,"abstract":"In this paper, a new multi-degree-of-freedom (MDOF) ultrasonic motor is designed. The motor is composed of four rectangular vibrators which are arranged as the Chinese word `ten'. The stator is driven by a composite of bending vibrations in two orthogonal directions. In the design process, the finite element model is established to find the anti-symmetric and symmetric modes of the stator. Structural dimensions that affect modal frequencies are selected and optimized. Through harmonic response simulation, the running state of the stator under sinusoidal signal is obtained and results show bending vibration is preferred. According to the analysis results, a motor prototype is made. Flexible hinges are used to improve the motor structure at the connecting position. The prototype has good output characteristics and the speed of the rotor can reach 0.122r/s under 400V voltage. The new motor has a certain reference value in the research of MDOF ultrasonic motors.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124810668","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 : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364511
Peng Hu, Bin Huang, Lijun Yi, T. Ma, Jianke Du, S. Zhgoon, Ji Wang
Cylinders of elastic solids are widely used in various mechanical and electrical structures for many purposes including structural and functional elements. Vibrations of cylinders are of interests for the optimal design and enhanced performance through the consideration of structural and material parameters. By extending earlier work on free vibrations of an elastic cylinder based on the expansion of displacements in Chebyshev polynomials, we formulated the procedure with the Ritz method for an anisotropic cylinder of quartz crystal. The challenges of such an analysis include the material properties dependence on the angular position in polar coordinates, strong couplings of modes, and dense matrices for eigenvalue extraction. The vibration frequency and mode shapes are obtained from the eigenvalue problem. We intended to use the analytical procedure and software program with the RUSpec for material characterization with cylindrical samples. We found the Chebyshev polynomials are adequate to represent displacements for accurate vibration solutions.
{"title":"Free vibrations of an anisotropic cylinder with the Ritz method","authors":"Peng Hu, Bin Huang, Lijun Yi, T. Ma, Jianke Du, S. Zhgoon, Ji Wang","doi":"10.1109/SPAWDA.2015.7364511","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364511","url":null,"abstract":"Cylinders of elastic solids are widely used in various mechanical and electrical structures for many purposes including structural and functional elements. Vibrations of cylinders are of interests for the optimal design and enhanced performance through the consideration of structural and material parameters. By extending earlier work on free vibrations of an elastic cylinder based on the expansion of displacements in Chebyshev polynomials, we formulated the procedure with the Ritz method for an anisotropic cylinder of quartz crystal. The challenges of such an analysis include the material properties dependence on the angular position in polar coordinates, strong couplings of modes, and dense matrices for eigenvalue extraction. The vibration frequency and mode shapes are obtained from the eigenvalue problem. We intended to use the analytical procedure and software program with the RUSpec for material characterization with cylindrical samples. We found the Chebyshev polynomials are adequate to represent displacements for accurate vibration solutions.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127084004","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 : 2015-10-01DOI: 10.1109/SPAWDA.2015.7364473
Wen-han Lv, Xianmei Wu, Di Zhang, Yun-fei Ye
This paper studied how to quantify circular hole in steel with ultrasonic phased array technology. Ultrasonic pulses emitted from array elements will be reflected by defects, cracks or something else. The echo signals will carry the information of the reflector. When the reflector is a circular hole, two echoes will be received. From the two echoes we may obtain the size of the circular hole. We used the difference of the two signals' sound path to estimate the size of a series of circular holes with different diameters in steel. The experimental results for circular holes in steel showed that the size of these holes could be obtained with an error within 0.1mm by this quantitative method. The minimum hole with diameter 0.5mm in the sample could also be quantitatively estimated. Finite element method was used to simulate the ultrasonic pulses propagation in order to quantify defects better. The results of the simulation agreed well with the experiments, which was very valuable for further study in quantifying defects using ultrasonic phased array.
{"title":"Quantitative estimation to circular holes in steel for non-destructive testing using ultrasonic phased array","authors":"Wen-han Lv, Xianmei Wu, Di Zhang, Yun-fei Ye","doi":"10.1109/SPAWDA.2015.7364473","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364473","url":null,"abstract":"This paper studied how to quantify circular hole in steel with ultrasonic phased array technology. Ultrasonic pulses emitted from array elements will be reflected by defects, cracks or something else. The echo signals will carry the information of the reflector. When the reflector is a circular hole, two echoes will be received. From the two echoes we may obtain the size of the circular hole. We used the difference of the two signals' sound path to estimate the size of a series of circular holes with different diameters in steel. The experimental results for circular holes in steel showed that the size of these holes could be obtained with an error within 0.1mm by this quantitative method. The minimum hole with diameter 0.5mm in the sample could also be quantitatively estimated. Finite element method was used to simulate the ultrasonic pulses propagation in order to quantify defects better. The results of the simulation agreed well with the experiments, which was very valuable for further study in quantifying defects using ultrasonic phased array.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121143935","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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