2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications最新文献

{"title":"The ground motion of interacting circular lining structure and crack under impact loading","authors":"M. Xu, Zai-lin Yang","doi":"10.1109/SPAWDA.2008.4775783","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775783","url":null,"abstract":"The problems of SH-wave scattering, which is caused by a shallow-embedded circular lining structure and beeline crack of arbitrary length and arbitrary position while bearing impact loading at horizontal interface, are studied in this paper based on the field of linearly elastic dynamic mechanics. This problem can be considered as the problem of the defending of blast. The ground motion is given finally. The methods of Green's function, complex variables and multi-polar coordinates are used here. Firstly a suitable Green's function is constructed, which is an essential solution of the displacement field for the elastic half-space possessing circular lining structure under the out-of-plane harmonic line source load at an arbitrary point. Then, using the Green's function and the method of crack-division, the crack is established: reverse stresses are inflicted along the crack, that is, out-of-plane harmonic line source loads, which are equal in the quantity but opposite in the direction to the stresses produced for the reason of SH-wave scattering by crack or circular lining structure, are loaded at the region where the crack will appear, thus the crack can be made out. The scattering of SH-wave by circular lining structure subjected to the impact loading at horizontal interface is known. Then, the expressions of displacement field and stress field are established when the crack and circular lining structure are both in existent. Thus, according to the boundary condition around the circular lining structure, the solution of the problem can be reduced to a series of algebraic equations and solved numerically by truncating the finite terms of the infinite integral equations. Numerical examples are provided to show the influences of the wave numbers of the incident wave, the distance between the center of the circular lining structure and horizontal surfaces, the distance between the center of the circular lining structure and the tip of crack, the shear modulus ratio of the media and the inclusion, the wave number ratio of the inclusion and the media, the angle of crack and the length of crack upon the ground motion.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124583472","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}

{"title":"Detecting of water shortage information in crops with acoustic emission technology and automatic irrigation system","authors":"Shifeng Yang, Jian-ying Guo, Xiuqing Wang","doi":"10.1109/SPAWDA.2008.4775854","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775854","url":null,"abstract":"The automatic and real time irrigation system based on detecting of water shortage information in crops with acoustic emission (AE) technology was studied and developed, an experimental study in greenhouse with the crop of tomato as the target was carried out. PCI-2 AE board-card, R15 sensor, electronic balance, temperature sensor, humidity sensor, CO2 sensor, illumination sensor and PCI-8333 DAQ were adopted to compose the hardware detecting system, the virtual instrument technology was used to construct the software system, the three factors of soil, crops and atmosphere in SPAC system were effectively integrated, the real time acquisition and detecting system of information between crop acoustic emission and each environmental factor was established. It shows that: to some extent, the frequency counts of AE of the crops in water stress increase gradually with the increase of the water stress extent in crops, and are related with the transpiration rate of crops; in order to avoid the influence from water stress on crops, it has the potential to realize the automatic irrigation and regulation in crops based on the information acquired from crops with AE sensor, to make the transpiration amount and irrigation amount of crops achieve an balanced regulation, aiming to make the crops grow in an optimum soil water environment, to increase the utilization of water, and improve the quality of crop fruit.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132994525","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}

{"title":"Prediction of effect of steam stimulation based on a fuzzy comprehensive evaluation model","authors":"Hai-jing Wang, S. Xue","doi":"10.1109/SPAWDA.2008.4775863","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775863","url":null,"abstract":"Aiming at the problem of neglecting fuzzy factors in traditional prediction of effect of steam stimulation, using a fuzzy comprehensive evaluation method, we propose a secondary fuzzy comprehensive evaluation model to analyze the effect of many uncertain factors on steam stimulation. First, according to the influencing factors of steam stimulation, the factor set and evaluation set are established; then the membership degree of the qualitative index and quantitative index to assessment grades is decided, and the single factor fuzzy relation matrix is established; Moreover, based on the influence degree of each factor on steam stimulation, the weighting set is also given. Finally, the secondary fuzzy compressive evaluation is conducted. Based on the secondary fuzzy comprehensive evaluation model, the steam stimulation effect for a well is predicted. And it is found that the predicted results are consistent to the observed data.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"6 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114129507","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}

{"title":"Determination of transient dynamic pressure by piezoelectric sensor","authors":"Hui-ming Wang, H. Ding","doi":"10.1109/SPAWDA.2008.4775784","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775784","url":null,"abstract":"The piezoelectric hollow sphere sensor is analyzed theoretically to predict the dynamic pressure with the knowledge of electric potential difference between the internal and external surfaces. The analysis is based on the three-dimensional theory of spherically isotropic piezoelectricity and is suitable for the piezoelectric hollow sphere sensor with arbitrary thickness. Under the free electric charge boundary condition, the relation between the dynamic pressure and the measured electric potential difference is derived as a second kind Volterra integral equation by means of the separation of variables method. The dynamic pressure is determined by solving the integral equation.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130773345","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}

{"title":"Flaw reconstruction using the Finite Element Method and the experimental method","authors":"G. Zheng, Bin Wu, C. He","doi":"10.1109/SPAWDA.2008.4775859","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775859","url":null,"abstract":"This paper deals with an inverse problem based on the simultaneous use of the Finite Element Method (FEM) and the experimental method for the shape reconstruction of defects in inhomogeneous material. In a cylindrical specimen including different defects, a classic 2D finite element method is used for flaw echo computations. Results obtained from such calculations are used as the data for the inverse problem solution. A brief result of the shape reconstruction of the experimental method is also presented. Although two different ways get the same results, revealing drawbacks and advantages of the proposed approach as regards to the results.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128277576","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}

{"title":"Theoretical analysis of the dynamic properties of 2–2 cement based piezoelectric composite for sensor applications","authors":"Z. Shi, Taotao Zhang","doi":"10.1109/SPAWDA.2008.4775791","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775791","url":null,"abstract":"Till now only a few of literatures related to the theoretical analysis of cement based piezoelectric composite, especially for the 2-2, 0-3 and 1-3 cement based piezoelectric composites. Based on some experimental investigations, the analytical models for the dynamic properties of 2-2 cement based piezoelectric sensors have been established in this paper. Moreover, the exact solutions have been obtained by using the displacement method and comparisons as well as discussions with the experimental results have also been presented and good agreements have been found. It is found that the analytical model established in this paper works very well, which is benefit to the design for this kind of smart devices.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125472645","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}

{"title":"Study on the preparation of nbbt lead-free piezoceramics powders by hydrothermal method","authors":"Xiang-ning Xu, Jun Liu, Caifeng Chen, Ping Chen","doi":"10.1109/SPAWDA.2008.4775830","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775830","url":null,"abstract":"(Na0.5Bi0.5)0.94Ba0.06TiO3 (NBBT) powders are prepared by hydrothermal synthesis process. The effects of process conditions on the structure of NBBT are studied. In addition, effect of surface performance of NBBT powders is discussed with the amount of coupling agent increasing. The structure and property of the resulted powders were characterized by X-Ray diffraction (XRD). The granularity distribution and the surface morphology of the resulted films were studied by laser diffraction-based particle size analyzer and scanning electron micrograph (SEM).The results showed that that pure NBBT powders can be obtained when the powders is calcined at the 180 C for 48 hours. And appropriately adding coupling agent can strengthen the density of powders. The impurities of BaTiO3 show an earlier increase and later decrease with the amount of coupling agent increasing.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115104831","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}

{"title":"Medical piezoelectric ultrasonic transducer and their performance analyses","authors":"Lin-zhi Yang, Q. Li, Yang-hong Ji, Jie Geng, Sheng-li Wang, Chun-fang Cai","doi":"10.1109/SPAWDA.2008.4775837","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775837","url":null,"abstract":"Piezoelectric ultrasonic transducer is the transducer which is technically designed for electrical measurement of non-medical electrical capacity, some physiology parameters of human body like blood pressure, pulse, breathe, body temperature, and etc. are non-electrical capacity. In order to measure these physiological parameters, the simplest way is to change them for the project is technically easier for measuring the amount of electricity (or called telecommunications), then the telecommunications which is equivalent to some of these physiological parameters to be enlarged, and measured, the medical transducer is the completion of the conversion of such devices. This article discussed the classification, structure and main performance index, and their meaning and application of the concept of volume, and introduced the medical application of the more important the concept of resolution and its transducer performance.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126335423","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}

{"title":"Thermal shock problem of piezoelectric materials with temperature-dependent properties","authors":"Ting Sun, Xiao-geng Tian, Li Chen, Ya-peng Shen","doi":"10.1109/SPAWDA.2008.4775740","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775740","url":null,"abstract":"Base on the generalized thermoelastic theories of Lord and Shulman (L-S) and Green and Lindsay (G-L), the thermal shock problem of an infinite piezoelectric plate with temperature-dependent properties are studied by using the finite element method (FEM). The governing equations are nonlinear of temperature due to temperature-dependent properties. It is difficult to solve the problem by using the integral transform method. The FEM equations are solved directly in time domain. The distributions of temperature, displacement, stress and electric field are obtained. In the results, it is easy to find that the properties have jumps at the heat wave under the L-S and G-L theories but change continuously under the classical theory. The temperature-dependent properties make the other parameters different from temperature-independent condition. From the results obtained in the paper, one can get that the time-domain solution method of FEM can describe the finite velocity of heat conduction accurately.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127606702","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}

{"title":"Modeling of power transmission through an elastic wall by piezoelectric transducers and acoustic waves","authors":"Zengtao Yang, S. Guo, Yuanhong Hu, Jia-shi Yang","doi":"10.1109/SPAWDA.2008.4775755","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775755","url":null,"abstract":"We present our recent modeling results on power transmission through an elastic wall by piezoelectric transducers and acoustic waves. This includes the case of finite piezoelectric transducers on plates, power transmission through circular cylindrical shells, and mechanical nonlinearity due to large deformations near resonance.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127340296","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}