{"title":"Sample design in resonant ultrasound spectroscopy for measuring material constants of ScAlN piezoelectric film","authors":"Shungen Wei, Yue Hu, Xin Miao, Tao Han","doi":"10.1109/SPAWDA.2016.7830002","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7830002","url":null,"abstract":"Soon after Akiyama et al. demonstrates that Sc-doped aluminum nitride (ScAlN) thin film exhibits extraordinary strong piezoelectricity, the investigation on the full set of material constants of ScAlN film have drawn much attention. The classical measurements of the resonating frequency or the plane-wave velocities require a series of measurements on samples with different geometries, which possibly results in non-self-consistent material constants. The resonant ultrasound spectroscopy (RUS) method can determine full material constants of bulk materials using only one sample. But for the film sputtered on a certain substrate, some elastic constants like C33 and C44 are not sensitive to any resonant frequencies. In this paper, a new method for sample preparation is proposed to construct some new resonant modes related to C33 and C44.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125740830","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":"The influence of Maxwell stresses on a moving crack in piezoelectric materials","authors":"L. Qi, Yu-hao Li, C. Gao","doi":"10.1109/SPAWDA.2016.7829962","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7829962","url":null,"abstract":"A plane problem of a moving crack with constant velocity in piezoelectric materials is investigated systematically. Based on the extended Stroh formalism, the closed-form expression of electric displacement in the moving crack, the electrostatic fields and dynamic stress and dynamic electric intensity factors are obtained in a concise form. The influence of Maxwell stresses and the speed of the crack is studied when the model bears combined mechanical and electrical loads at infinity. The electrically semi-permeable crack boundary condition is adopted. The effects of mediums inside the crack and surrounding the matrix at infinity are also analyzed theoretically. Numerical results are presented and it is found that the dynamic intensity factors are related not only to the electric field, but also to the velocity of the moving crack.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132362379","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":"Defect identification by an ultrasonic cylindrical phased array","authors":"S. Chen, Bi-xing Zhang","doi":"10.1109/SPAWDA.2016.7830010","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7830010","url":null,"abstract":"In this paper, a new method is presented for defects classification by ultrasonic cylindrical phased array. Firstly, a finite element model is conducted to simulate the defects identification by the cylindrical phased array transducer. A series of simulation are done for 4 types of defects with different sizes by a 64-element cylindrical phased transducer with the center frequency of 500 kHz. Then, the Wavelet-packet transform decompose algorithm is used to four-levers decompose, reconstruct and extract the feature of these echo signals. Finally, the reconstructed signals are used to the deep neural network to the defect classification. The accuracy of the known defects classification is 100%, which means the method is feasible for classification by ultrasonic cylindrical phased array.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134214715","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":"A two-dimensional image stabilization stage driven by piezoelectric actuators","authors":"Bing-nan Dang, Weiqing Huang, Mengxin Sun","doi":"10.1109/SPAWDA.2016.7830029","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7830029","url":null,"abstract":"Optical image stabilization system occupy an important place in infrared imaging products. Piezoelectric actuators have great advantages such as high-response and high-precision. A 2D stage using linear piezoelectric actuators is designed to achieve image stabilization. The piezoelectric linear actuator contains a shrinkage amplification mechanism and a stretching amplification mechanism, which can provide large stroke for the stage. Experimental results show the actuator has 67 μm displacements under the sine voltage of 120 V and the displacement is proportional to the voltage, the change of frequency has little effect on the displacement under the low frequency. It proves that the design scheme is feasible and provides a basis for integrated stabilization institution.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133989699","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":"Two-dimensional analysis of piezoelectric thin-film acoustic wave resonators","authors":"Nian Li, Z. Qian, Bin Wang, Jia-shi Yang","doi":"10.1109/SPAWDA.2016.7830043","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7830043","url":null,"abstract":"We derived a system of two-dimensional equations for thickness-extensional vibrations of a four-layered plate consisting of a piezoelectric thin film on an elastic substrate with driving and ground electrodes. It takes into consideration the couplings among the thickness-extensional mode to extensional, flexural, fundamental and second-order thickness-shear modes. Mindlin's approach of using a power series expansion of the displacement field in the plate thickness coordinate was employed. The propagation of straight-crested waves in the plate was studied. Furthermore, we used these equations to analyze FBAR's couplings vibrations, frequency spectra and mode shapes. It is shown that the equations obtained are very accurate for long waves in the plate. Free vibration results are helpful for the design of thin-film piezoelectric acoustic wave resonators to avoid the mode couplings.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126243509","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}
Yongwei Liu, D. Shang, Sheng-feng Fu, Jun-ming Zhang, Hongyang Chen
{"title":"The investigation on calculating the effect of noises from underwater vortex generator on sail hull","authors":"Yongwei Liu, D. Shang, Sheng-feng Fu, Jun-ming Zhang, Hongyang Chen","doi":"10.1109/SPAWDA.2016.7829964","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7829964","url":null,"abstract":"When ships run at high speed-cavitation is formed in the bulge area. Because cavitation can make big noises-it will be a threat to the sonar. Cavitation can also destroy the blades of propellers. A method is proposed that underwater cavitation is suppressed through vortex generation. The effect of flow noise and radiated noise from vortex generator on sail hull model is investigated. Through the comparison of flow field-we find that vortex generator has changed the transition area of sail hull model. The results indicate that flow noise and radiated noise from underwater vortex generator is only a little-compared to that of sail hull model. The total level of sound radiation power from the model of sail hull and with vortex generator is less than that of sail hull model. Therefore-it is beneficial to suppress the cavitation by vortex generator-when ships run at high speed.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114700109","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}
Shao-yun Wang, B. Neubig, Jinghui Wu, T. Ma, Jianke Du, Ji Wang
{"title":"Extension of the frequency aging model of crystal resonators and oscillators by the Arrhenius factor","authors":"Shao-yun Wang, B. Neubig, Jinghui Wu, T. Ma, Jianke Du, Ji Wang","doi":"10.1109/SPAWDA.2016.7830003","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7830003","url":null,"abstract":"The aging of quartz crystal resonators has been a key requirement of the product development and broad applications in signal generation and processing of many mission and life critical functions. Among many aging models for the analysis of long-term behavior of quartz crystal resonators, the Arrhenius model is widely accepted for most materials in engineering applications and physical process including quartz crystal resonators. A series of testing were conducted in different industrial laboratories in Japan and Germany to collect essential aging data of quartz crystal resonators and oscillators with the consideration of time, temperature, and frequency changes. The measurement data is merged and analyzed to extract different parameters of aging models for evaluation and validation. Finally, after careful examinations of parameters from different aging models, it is suggested that the Arrhenius model with modification is to be considered for the aging standard and further analysis are made with selected parameters.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130564788","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":"The calibration of targeting for an ultrasound-guided high-intensity focused ultrasound system","authors":"Ke Li, Jing-feng Bai, Yazhu Chen, Xiang Ji","doi":"10.1109/SPAWDA.2016.7829990","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7829990","url":null,"abstract":"Accurate targeting is essential to ensure safety for high-intensity focused ultrasound (HIFU) treatment. Recently we developed an ultrasonography-guided high-intensity focused ultrasound (USgHIFU) system, in which the imaging probe is mounted into the central hole of spherical HIFU phased-array transducer for targeting and monitoring. An acrylic plate with two flat-head bolts is used for the assessment of the targeting accuracy. Imaging planes with the angles from −90° to 90° with an interval of 30° were calibrated and respective targeting errors were measured. And the targeting errors of non-calibrated imaging planes were derived from the average of the nearest two calibrated planes. The coordinates in HIFU sonication were corrected by the error in the specific imaging plane. With the proposed calibration approach, the targeting error has been reduced to less than 0.5 mm. In vitro experimental result also shows that the temperature rise of the targeting focus in the image is similar to the result of previous work. In conclusion, our USgHIFU system is capable of accurate sonication.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124457730","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":"Love waves in one-dimensional domain inversion phononic crystals with a layer","authors":"Guang-ying Yang, Jianke Du, Ji Wang","doi":"10.1109/SPAWDA.2016.7830016","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7830016","url":null,"abstract":"We study the propagation of Love wave in phononic crystal with piezoelectric waveguide layer. The first band gap of Love wave is calculated by plane wave expansion (PWE) method and finite element method (FEM). The influence of the waveguide layer on the band gap is analyzed. Numerical analysis shows that the thickness of the layer has a significant effect on the first band gap. The band gap can be shift and widen by reduce the thickness of the layer. These results are obtained by PWE method and compared to finite element calculations. The transmission of the Love wave through finite element is also given.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133961769","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":"Analysis of a circular arc-crack in thermoelectric media","authors":"Chuang-Bin Yu, C. Gao","doi":"10.1109/SPAWDA.2016.7829989","DOIUrl":"https://doi.org/10.1109/SPAWDA.2016.7829989","url":null,"abstract":"The plane problem of a circular-arc crack in an infinite thermoelectric medium under remote thermal-electric loads is studied in this paper. The crack surface boundary conditions are assumed to be electrically and thermally impermeable. The explicit solutions are presented based on the complex variable method. Expressions for the electric flux, energy flux, thermal flux, and temperature and stress fields are derived. It is found that these fields exhibit traditional square-root singularity at the crack tip. Then the electric flux, the energy flux and stress intensity factors at the crack tip are obtained. The results show that the electric flux intensity factor and the energy flux intensity factor depend on the far-field electric flux loads and the applied total energy flux loads, respectively. In addition, the simultaneous existence of mode-I and mode-II stress intensity factors are found to be dependent on the angle of electric flux, the electric conductivity, the angle of thermal flux, the thermal conductivity, the central angle of the crack and thermal-elastic isotropy.","PeriodicalId":243839,"journal":{"name":"2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134496884","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}