2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA)最新文献_第10页

Overlapping Grid Method for Solving the Partial Differential Equations Using the SBP-SAT Technique 用SBP-SAT技术求解偏微分方程的重叠网格法

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681800

Cheng Sun, Guan-xi-xi Jiang, Xin-zhu Li, Yong Yang, Zai-lin Yang

引用次数: 1

Analytical Simulation Of The Waves Reflected From A Distant Slanted Interface Outside A Borehole 井外远处倾斜界面反射波的解析模拟

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681820

Hengshan Hu, Jiaqi Xu, Zhi Wang

{"title":"Analytical Simulation Of The Waves Reflected From A Distant Slanted Interface Outside A Borehole","authors":"Hengshan Hu, Jiaqi Xu, Zhi Wang","doi":"10.1109/SPAWDA.2019.8681820","DOIUrl":"https://doi.org/10.1109/SPAWDA.2019.8681820","url":null,"abstract":"The wave field of single-well imaging is asymmetric. It takes a lot of time (hours or even longer) to calculate the wave field by numerical algorithm, which cannot meet the needs of real-time processing of logging data. In order to solve the problem, the method of steepest descent and reciprocity are used to obtain the analytic solution of the wave field in the borehole stimulated by the reflected wave field. The waves radiated by a monopole or a dipole acoustic source in a borehole is first formulated by ignoring the reflector, by applying the boundary conditions at borehole wall. These radiated waves are approximated by the steepest descent path method, which is quite exact when the waves travel far from the borehole. These waves are then reflected back by the reflector. The reflection waves, including P, SV and/or SH waves, are taken as radiated from image sources. Finally the waves arriving an array of receivers in the borehole are obtained by applying reciprocity relations. The analytical waveforms agree well with those by three dimensional finite difference time domain method.","PeriodicalId":304940,"journal":{"name":"2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129879248","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

Localization of Hypervelocity Impact- Engendered Damage In Stiffened Curved Structures Using In-Situ Acoustic Emission 基于原位声发射的加劲弯曲结构超高速碰撞损伤定位

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681877

Yefei Huang, Wuxiong Cao, B. Pang, R. Chi, Yuan Cai

引用次数: 0

Comparison of Interface Circuits for Piezoelectric Wind Energy Harvesting from Galloping Oscillation 压电式振荡风能采集界面电路的比较

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681793

Hong-bin Wang, C. Pan, Yu Wang, Haojie Xia, Liandong Yu

引用次数: 1

Investigation of Coupling Effects in Rectangular Quartz Resonators with Partial Electrodes 部分电极矩形石英谐振腔的耦合效应研究

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681797

Nian Li, Z. Qian, Bin Wang

{"title":"Investigation of Coupling Effects in Rectangular Quartz Resonators with Partial Electrodes","authors":"Nian Li, Z. Qian, Bin Wang","doi":"10.1109/SPAWDA.2019.8681797","DOIUrl":"https://doi.org/10.1109/SPAWDA.2019.8681797","url":null,"abstract":"Mindlin’s two-dimensional theory has been derived and applied on researches of quartz resonators for many years. However, in most of these works focuses were placed on vibrations varying only in two directions including thickness direction, while the effect of another direction like length or width direction was normally neglected. Besides, researchers often model quartz resonators as fully electroded plates because of the resultant simplicity. Since a real device is finite in all directions and only centrally electroded, results obtained in those papers can’t offer quantitative information of vibrations with enough accuracy. In this paper, a theoretical analysis of a rectangular trapped-energy resonator of AT-cut quartz is studied using Ritz method associated with the variational formulation of Mindlin’s first order equations. Frequency spectra and mode shapes of a real-scaled trapped-energy resonator, which is finite in all directions, are obtained with the consideration of mode couplings among thickness-shear mode, thickness-twist mode and flexural mode. Results show the existence of energy trapping and coupling phenomenon and are helpful for thorough and accurate understanding of quartz resonators’ vibrations.","PeriodicalId":304940,"journal":{"name":"2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126919432","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 an Ultra-Wideband Band-Passfilter Circuit for Electromagnetic Ultrasonic Signal Condition 电磁超声信号条件下的超宽带带通滤波电路设计

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681845

Tian-xiang Hu, Yinghong Zhang, Xiao Wei, Z. Qian

引用次数: 0

Vibration Analysis of Laminated Plates in a Piezoelectric Inkjet Printhead 压电喷墨头层合板的振动分析

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681825

Zhi-li Wang, Jun Liu, Dong-cheng Zheng, A. Zhang, K. Hu, Ji Wang

引用次数: 0

Mechanical Behavior Of Lead-Free Solder Micro-Joints Under Electrical Conditions 电气条件下无铅微焊点的力学行为

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681874

X. Long, Wenbin Tang, Chenguang Huang

{"title":"Mechanical Behavior Of Lead-Free Solder Micro-Joints Under Electrical Conditions","authors":"X. Long, Wenbin Tang, Chenguang Huang","doi":"10.1109/SPAWDA.2019.8681874","DOIUrl":"https://doi.org/10.1109/SPAWDA.2019.8681874","url":null,"abstract":"In this paper, the uniaxial tensile behaviour of micro-scale Sn-3.0Ag-0.5Cu (SAC305) solder joints under electrical-mechanical coupling fields was studied. The diameter is 280 $mu$m and is similar to the dimension of solder joints used in practical electronic devices. Such a microscale for solder joints is rarely investigated due to the preparation challenges especially for the investigations regarding constitutive behaviour. Thanks to the small diameter, the applied electric current density for the solder joints can be up to 8000 A/cm2, which is relatively unexplored to date in the reported literature. In the present study, the uniaxial tensile force was measured with the increasing displacement for different electric current densities to address the effect of electric current on the mechanical properties of SAC305 solder joints. A closed relationship between current density and ultimate tensile stress was apparently observed according to the experimental results. In addition, when the fracture occurs in the solder joint, the elongation of the specimen was also collected and analyzed. Compared with previous experimental study, the solder micro-joints own much better tensile properties than the solder joints with larger diameters especially under a high current density. As an interesting phenomenon, an oscillation was observed only for the applied force-displacement responses subjected to the current density of 8000 A/cm2. This was explained from the thermo-mechanical point of view but remains to be elucidated in further investigations.","PeriodicalId":304940,"journal":{"name":"2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114466914","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

The Dielectric and Piezoelectric Properties of YCa4O(BO3)3 Crystal Annealed in Critical Condition 临界退火yca40o (BO3)3晶体的介电和压电性能

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681861

Shi-wei Tian, Lili Li, F. Yu, Yan-lu Li, Xiu-feng Cheng, Zhengping Wang, Xian Zhao

{"title":"The Dielectric and Piezoelectric Properties of YCa4O(BO3)3 Crystal Annealed in Critical Condition","authors":"Shi-wei Tian, Lili Li, F. Yu, Yan-lu Li, Xiu-feng Cheng, Zhengping Wang, Xian Zhao","doi":"10.1109/SPAWDA.2019.8681861","DOIUrl":"https://doi.org/10.1109/SPAWDA.2019.8681861","url":null,"abstract":"The YCa4O(BO3)3 (YCOB) crystal is an attractive piezoelectric material for sensing at elevated temperatures. In this paper, the dielectric and piezoelectric properties of YCOB crystal annealed at high temperature of 1100°C and low atmosphere pressure of 2 Pa for 24 h were reported. Comparing to the pristine YCOB crystal, the relative dielectric permittivity $(varepsilon _{22}/varepsilon _{0})$ slightly increased after annealing, while the piezoelectric coefficient (d26) got decreased, with a variation of $lt 7%$. The chemical bonding for the annealed YCOB was studied using X-ray photoelectron spectroscopy, from which the variations of binding energies of B, Ca, and Y decreased below 0.2 eV, indicating the stable electronic structure of YCOB crystal. The vacancy formation energies for Y, Ca, O, and B atoms in YCOB crystal were also analyzed via first principle calculations. The O atom was found to possess the lowest vacancy formation energy, thus easier to evaporate during critical annealing and easier to compensate than other atoms. The vacancy defects are believed to be the main factor dominant the variations of dielectric and piezoelectric properties.","PeriodicalId":304940,"journal":{"name":"2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114874872","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 Resonant-Type Inertia Drive Linear Motor Based on Piezoelectric Asymmetric Tuning-Fork Actuator 基于压电非对称音叉作动器的谐振式惯性驱动直线电机设计

2019 Symposium on Piezoelectrcity,Acoustic Waves and Device Applications (SPAWDA) Pub Date : 1900-01-01 DOI: 10.1109/SPAWDA.2019.8681870

Yu Wangi, Cheng-liang Pani, Tianliang Dai, Haojie Xia, Liandong Yu

引用次数: 2