Pub Date : 2019-11-01DOI: 10.1109/SPAWDA48812.2019.9019237
Zhiweng Wang, Hui Shen, Kang-dong Zhao, T. Pan, Deqing Kong, Xiao-long Lu
In this paper, a novel dual-rotor ultrasonic motor applied for underwater propulsion is proposed. It is briefly composed of rotor unit, stator unit, prepressure regulating mechanism, gear unit and bracket. The rotor unit comprises two rotating shafts, two driving disks and a pair of propellers with opposite turning directions. The stator unit comprises a metal matrix and a circular piezoelectric ceramic wafer. The metal matrix is in the shape of a spindle with its two ends serving as driving feet. The upper edge of the driving feet is used for generating propulsion force via contact friction induced by the first longitudinal vibration of the stator. The prepressure regulating mechanism is a torsion spring which can adjust the amount of deformation. It can be seen from experimental results that the speed of the prototype motor can reach 110 r/min and the stalling torque can reach 3 mN•m when the driving frequency is 63.55 kHz and the driving voltage is 150 Vp-p. The design and measurement results provide useful guidance for the application of ultrasonic motor in underwater environment.
{"title":"A Novel Dual-Rotor Ultrasonic Motor Applied for Underwater Propulsion","authors":"Zhiweng Wang, Hui Shen, Kang-dong Zhao, T. Pan, Deqing Kong, Xiao-long Lu","doi":"10.1109/SPAWDA48812.2019.9019237","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019237","url":null,"abstract":"In this paper, a novel dual-rotor ultrasonic motor applied for underwater propulsion is proposed. It is briefly composed of rotor unit, stator unit, prepressure regulating mechanism, gear unit and bracket. The rotor unit comprises two rotating shafts, two driving disks and a pair of propellers with opposite turning directions. The stator unit comprises a metal matrix and a circular piezoelectric ceramic wafer. The metal matrix is in the shape of a spindle with its two ends serving as driving feet. The upper edge of the driving feet is used for generating propulsion force via contact friction induced by the first longitudinal vibration of the stator. The prepressure regulating mechanism is a torsion spring which can adjust the amount of deformation. It can be seen from experimental results that the speed of the prototype motor can reach 110 r/min and the stalling torque can reach 3 mN•m when the driving frequency is 63.55 kHz and the driving voltage is 150 Vp-p. The design and measurement results provide useful guidance for the application of ultrasonic motor in underwater environment.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"46 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":"114197406","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/SPAWDA48812.2019.9019301
Yuan Liu, Yi Shen, Shuai Jiang, Bin Han, Yanfeng Peng
Wind turbine blades and aircraft wings are mainly composed of large-area curved plate-like structures. The structure health monitoring (SHM) technology based on Lamb waves which are sensitive in detecting minor damage is promising. Traditional Lamb wave sensors are generally made of piezoelectric ceramics (PZT). Because of their brittleness and hardness, such PZT sensors are not suitable for curved structures. A new type of flexible 0-3 piezoelectric composite was prepared by combining PZT particles with epoxy resin in this paper. The influence of the mass ratio of PZT particles and epoxy resin, polarization electric field, polarization temperature, and polarization time on the material properties were investigated by using orthogonal experiment method. Experimental tests were performed to explore the dynamic response properties of the fabricated composite material. The response voltage amplitudes under different excitation frequencies were compared with MFC, PVDF, and PZT disc. It is applied to curved plate and the damage detection is carried out by using elliptic imaging algorithm. The results show that the 0-3 piezoelectric composite presents good sensing response characteristics. It is significant for the curved plate-like structure in SHM applications.
{"title":"Preparation and Properties of Flexible 0-3 Polymer-Piezoelectric Composites","authors":"Yuan Liu, Yi Shen, Shuai Jiang, Bin Han, Yanfeng Peng","doi":"10.1109/SPAWDA48812.2019.9019301","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019301","url":null,"abstract":"Wind turbine blades and aircraft wings are mainly composed of large-area curved plate-like structures. The structure health monitoring (SHM) technology based on Lamb waves which are sensitive in detecting minor damage is promising. Traditional Lamb wave sensors are generally made of piezoelectric ceramics (PZT). Because of their brittleness and hardness, such PZT sensors are not suitable for curved structures. A new type of flexible 0-3 piezoelectric composite was prepared by combining PZT particles with epoxy resin in this paper. The influence of the mass ratio of PZT particles and epoxy resin, polarization electric field, polarization temperature, and polarization time on the material properties were investigated by using orthogonal experiment method. Experimental tests were performed to explore the dynamic response properties of the fabricated composite material. The response voltage amplitudes under different excitation frequencies were compared with MFC, PVDF, and PZT disc. It is applied to curved plate and the damage detection is carried out by using elliptic imaging algorithm. The results show that the 0-3 piezoelectric composite presents good sensing response characteristics. It is significant for the curved plate-like structure in SHM applications.","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":"115040580","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/SPAWDA48812.2019.9019243
Yi-feng Hu, Xiaoshan Cao, Yixun Niu, Yanyun Ru
To solve the problem of SH wave propagation in a functionally graded nano copper layered wafer, in this paper the power series technique is employed to solve governing equations with variable coefficients. SH waves in a single-layer structure and a multi-layered structure are investigated. The results show that multiple modes for SH waves exist in functionally graded nano copper wafers, the gradient property leads to decreased phase velocity, and the absolute value of the phase velocity variation is positively correlated with the gradient coefficient. Both the phase velocity variation and the phase velocity variation rate in Mode 2 are small compared with the other modes. Mode 4 is recommended for nondestructive evaluation. These results should provide theoretical guidance for nondestructive evaluation in functionally graded nano material layered structures.
{"title":"SH Waves in A Functionally Graded Nano Copper Layered Wafer","authors":"Yi-feng Hu, Xiaoshan Cao, Yixun Niu, Yanyun Ru","doi":"10.1109/SPAWDA48812.2019.9019243","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019243","url":null,"abstract":"To solve the problem of SH wave propagation in a functionally graded nano copper layered wafer, in this paper the power series technique is employed to solve governing equations with variable coefficients. SH waves in a single-layer structure and a multi-layered structure are investigated. The results show that multiple modes for SH waves exist in functionally graded nano copper wafers, the gradient property leads to decreased phase velocity, and the absolute value of the phase velocity variation is positively correlated with the gradient coefficient. Both the phase velocity variation and the phase velocity variation rate in Mode 2 are small compared with the other modes. Mode 4 is recommended for nondestructive evaluation. These results should provide theoretical guidance for nondestructive evaluation in functionally graded nano material layered structures.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"27 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132124886","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 paper, a finite element model of a plane hydrophone mounted on a sound barrier plate is established, and the vibration damping performance of the sound barrier plate on the hydrophone is simulated. The influences of different size and different structural sound barriers on the vibration attenuation performance of the hydrophone are discussed. By comparing and analyzing the simulation results of the finite element model of the plane hydrophone mounted on the sound barrier, the influence law of acoustic baffle on the vibration absorption performance of hydrophone is concluded.
{"title":"Effect of Barrier on Vibration Reduction Performance of the Plane Hydrophone","authors":"Shu-shu Si, Xin-ran Xu, Kang-Yi Peng, Xue-rong Liao","doi":"10.1109/SPAWDA48812.2019.9019222","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019222","url":null,"abstract":"In this paper, a finite element model of a plane hydrophone mounted on a sound barrier plate is established, and the vibration damping performance of the sound barrier plate on the hydrophone is simulated. The influences of different size and different structural sound barriers on the vibration attenuation performance of the hydrophone are discussed. By comparing and analyzing the simulation results of the finite element model of the plane hydrophone mounted on the sound barrier, the influence law of acoustic baffle on the vibration absorption performance of hydrophone is concluded.","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":"128263250","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/SPAWDA48812.2019.9019311
X. Li, Bei Sun, L. Su
The thermal properties of the new negative Poisson's ratio honeycomb structure is investigated. The Poisson's ratio is calculated subject to pure bending. On this basis, the influence of auxetic effect caused by negative Poisson's ratio on thermal conductivity is further investigated. The thermal anisotropic characteristics are also reported in accordance with the anisotropic physical mechanism. Applying this structure to the satellite antenna reflection surface, the thermal deformation value of the antenna reflection surface under a uniform temperature field can be calculated by finite element analysis. Using particle swarm optimization, the optimization target is the accuracy of the antenna reflection surface profile and the total mass of the antenna. The optimization parameter is the design parameters of the negative Poisson's ratio honeycomb structure. The results show that the satellite's overall profile accuracy is reduced by 22.6%. Effectively improving the accuracy of the reflective surface of the antenna.
{"title":"Optimization of New Negative Poisson’s Ratio Honeycomb Sandwich Reflector Structure","authors":"X. Li, Bei Sun, L. Su","doi":"10.1109/SPAWDA48812.2019.9019311","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019311","url":null,"abstract":"The thermal properties of the new negative Poisson's ratio honeycomb structure is investigated. The Poisson's ratio is calculated subject to pure bending. On this basis, the influence of auxetic effect caused by negative Poisson's ratio on thermal conductivity is further investigated. The thermal anisotropic characteristics are also reported in accordance with the anisotropic physical mechanism. Applying this structure to the satellite antenna reflection surface, the thermal deformation value of the antenna reflection surface under a uniform temperature field can be calculated by finite element analysis. Using particle swarm optimization, the optimization target is the accuracy of the antenna reflection surface profile and the total mass of the antenna. The optimization parameter is the design parameters of the negative Poisson's ratio honeycomb structure. The results show that the satellite's overall profile accuracy is reduced by 22.6%. Effectively improving the accuracy of the reflective surface of the antenna.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"26 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":"121995902","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/SPAWDA48812.2019.9019252
Peng Zhao, Lili Yuan, B. Wang, Jianke Du, Ji Wang
In this paper, cement-based piezoelectric composite material is introduced into the periodic structure, and a new one-dimensional phononic crystal structure with air gap is proposed. The finite element method is used to calculate the band structure, and the influencing factors of the band gap are discussed in detail. From the results, we can find that the introduction of air gap can effectively reduce the starting frequency and increase the width of band gap. The position of the air gap and the geometric parameters of the periodic structure have important influences on the band gaps. The solving method and the related conclusions can be useful for vibration and noise reduction in practical engineering.
{"title":"Wave Propagation in One-Dimensional Periodic Cement-Based Piezoelectric Composite Layered Structures Using Fem","authors":"Peng Zhao, Lili Yuan, B. Wang, Jianke Du, Ji Wang","doi":"10.1109/SPAWDA48812.2019.9019252","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019252","url":null,"abstract":"In this paper, cement-based piezoelectric composite material is introduced into the periodic structure, and a new one-dimensional phononic crystal structure with air gap is proposed. The finite element method is used to calculate the band structure, and the influencing factors of the band gap are discussed in detail. From the results, we can find that the introduction of air gap can effectively reduce the starting frequency and increase the width of band gap. The position of the air gap and the geometric parameters of the periodic structure have important influences on the band gaps. The solving method and the related conclusions can be useful for vibration and noise reduction in practical engineering.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"152 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":"125897153","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/SPAWDA48812.2019.9019231
H. Qi, Enxiang Qu, Jing Guo, Guangqian Liu
The guided wave theory is used to study the scattering of SH guided waves in circular inclusions and semi-circular depressions in infinite piezoelectric strips. The semi-circular depression at the boundary position is treated by the multi-pole coordinate variation method. Using the contingency image method, the theoretical expression of the scattered wave satisfying the stress-free and electrical insulation conditions at the upper and lower boundaries of the band is constructed. Based on the boundary conditions, an integral equation is established. An analytical expression for the dynamic stress concentration factor (DSCF) and electric field intensity concentration factor (EFICF) are obtained. The DSCF and EFICF are analyzed by analyzing the order of the guided wave and the physical parameters of the medium, and compared with the existing literature in the calculation example.
{"title":"Analysis of Dynamic Anti-Plane Characteristics of Circular Inclusion and Semicircular Depression in Strip Piezoelectric Media by SH Guided Wave","authors":"H. Qi, Enxiang Qu, Jing Guo, Guangqian Liu","doi":"10.1109/SPAWDA48812.2019.9019231","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019231","url":null,"abstract":"The guided wave theory is used to study the scattering of SH guided waves in circular inclusions and semi-circular depressions in infinite piezoelectric strips. The semi-circular depression at the boundary position is treated by the multi-pole coordinate variation method. Using the contingency image method, the theoretical expression of the scattered wave satisfying the stress-free and electrical insulation conditions at the upper and lower boundaries of the band is constructed. Based on the boundary conditions, an integral equation is established. An analytical expression for the dynamic stress concentration factor (DSCF) and electric field intensity concentration factor (EFICF) are obtained. The DSCF and EFICF are analyzed by analyzing the order of the guided wave and the physical parameters of the medium, and compared with the existing literature in the calculation example.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"14 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":"129605278","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/SPAWDA48812.2019.9019265
Jie Yang, H. Qi
The ground motion response of the bi-material half space including multiple circular elastic holes impacted by SH waves is investigated. Green’s function approach and the "conjunction" technique of the bi-material interface are applied to derive the Fredholm integral equations of the first kind. Also the method of "image" is mentioned to construct the expressions of equivalent wave field. The expression of amplitude of ground surface displacement is obtained. Numerical computations are performed for a specific model of two circular holes in bi-material half space. The effect of the defects of medium on the amplitude of ground surface displacement is presented graphically.
{"title":"Ground Motion Response of Bi-Material Half Space Including Multiple Circular Holes Under Sh Waves Incidence","authors":"Jie Yang, H. Qi","doi":"10.1109/SPAWDA48812.2019.9019265","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019265","url":null,"abstract":"The ground motion response of the bi-material half space including multiple circular elastic holes impacted by SH waves is investigated. Green’s function approach and the \"conjunction\" technique of the bi-material interface are applied to derive the Fredholm integral equations of the first kind. Also the method of \"image\" is mentioned to construct the expressions of equivalent wave field. The expression of amplitude of ground surface displacement is obtained. Numerical computations are performed for a specific model of two circular holes in bi-material half space. The effect of the defects of medium on the amplitude of ground surface displacement is presented graphically.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"266 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":"123291084","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/SPAWDA48812.2019.9019298
Meng Li, Xiao He, Hao Chen
Cross-well seismic is a geophysical exploration method, where the seismic source is triggered in one well and the data are accepted in another well, in order to obtain the geological structure between the two wells. In this paper, we mainly study the algorithm of elastic wave reverse time migration imaging with cross-well seismic models. The forward simulations, pre-processing of received data, and reverse time migration imaging are presented. To overcome the problem of large amounts of memory costs in reverse time migration, we develop a saving boundary scheme into cross-well seismic to reduce the memory consumption. The feasibility of our algorithm is verified by a horizontally layered model.
{"title":"Elastic Wave Reverse Time Migration for Cross-Well Seismic","authors":"Meng Li, Xiao He, Hao Chen","doi":"10.1109/SPAWDA48812.2019.9019298","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019298","url":null,"abstract":"Cross-well seismic is a geophysical exploration method, where the seismic source is triggered in one well and the data are accepted in another well, in order to obtain the geological structure between the two wells. In this paper, we mainly study the algorithm of elastic wave reverse time migration imaging with cross-well seismic models. The forward simulations, pre-processing of received data, and reverse time migration imaging are presented. To overcome the problem of large amounts of memory costs in reverse time migration, we develop a saving boundary scheme into cross-well seismic to reduce the memory consumption. The feasibility of our algorithm is verified by a horizontally layered model.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"258 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":"123068364","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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