2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)最新文献_第10页

Strain Sensitivity of Epoxy-Quartz Packaged Saw Strain Sensors 环氧-石英封装锯片应变传感器的应变灵敏度

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019238

Pengfei Li, Hong-lang Li, Li-na Cheng, Yabing Ke, Yahui Tian

引用次数: 3

Ultrasonic Phased Array Imaging Method Based On Multi - Scattering Model 基于多散射模型的超声相控阵成像方法

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019323

Jianzu Gu, Bin Zhang, Rui-Xiang Su, Lei Qian, Rong Chen

{"title":"Ultrasonic Phased Array Imaging Method Based On Multi - Scattering Model","authors":"Jianzu Gu, Bin Zhang, Rui-Xiang Su, Lei Qian, Rong Chen","doi":"10.1109/SPAWDA48812.2019.9019323","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019323","url":null,"abstract":"With the development of ultrasonic technology, ultrasonic wave plays an increasingly important role in the field of nondestructive testing. Among all kinds of ultrasonic nondestructive testing technologie, ultrasonic phased array is widely used because of its high accuracy and flexibility. However, due to the existence of rayleigh limit, ordinary ultrasonic phased array technology cannot recover the space frequency greater than 2K, so it is impossible to achieve the resolution less than half of the wavelengthof the super-resolution. In this paper, we introduce a method to realize super resolution imaging in multi-band phased array.In this method, the damage is detected by multiple phased arrays, and the received signals are processed by specific algorithms to obtain super-resolution imaging. The signal is excited by M exciter and then received by N receiver. The total signal can form an M*N matrix. After singular valuedecomposition of the collected signal matrix,T significant eigenvalues can be obtained. The T significant eigenvalues represent the number of injuries. The singular vector after singular value decomposition contains the information of noise space. The number of eigenvalues in the signal space is the number of damage. Using the randomness of noise subspace, special algorithm can be used to restore the spatial frequency greater than 2K to achieve super-resolution imaging.The more elements in this method, the more accurate and complicated it is. As long as the smallest value of M and N is greater than the number of injuries, each injury can be successfully distinguished under super resolution. Therefore, the appropriate number of matrix elements should be selected for different damages.","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":"132152787","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

Identification of Ultrasonic Overlapped Signals based on Attenuation Matching and Sparse Deconvolution 基于衰减匹配和稀疏反卷积的超声重叠信号识别

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019315

Qiang Wang, Jie Mao, Guoxuan Lian

引用次数: 0

Reflection and Transmission of Thermoelastic Waves Through a Sandwiched Slab with Couple Stress 热弹性波在耦合应力夹层板中的反射和透射

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019309

Changda Wang, Yingjie Zhang, P. Wei, Yueqiu Li

{"title":"Reflection and Transmission of Thermoelastic Waves Through a Sandwiched Slab with Couple Stress","authors":"Changda Wang, Yingjie Zhang, P. Wei, Yueqiu Li","doi":"10.1109/SPAWDA48812.2019.9019309","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019309","url":null,"abstract":"The reflection and transmission of the thermos-elastic coupled waves across a slab of finite thickness that is sandwiched between two semi-infinite homogeneous isotropic couple stress elastic solids are studied. Based on the modified couple-stress theory and the Green-Lindsay theory, the governing equations of the thermoeleastic wave propagation are derived. Different from the classic elastic solid, the interface conditions involve the micro-rotation and the surface couple. The nontraditional interface conditions between the slab and two half-spaces are used to obtain the linear algebraic equations set from which the amplitude ratios of reflection and transmission waves can be determined. Then, the energy fluxes carried by reflection and transmission waves are calculated numerically and the normal energy flux conservation is used to validate the numerical results. At last, the influences of two thermal relaxation times are discussed based on the numerical results. It is found that the thermos-elastic coupling makes the longitudinal wave and the thermal wave not only dispersive but also attenuated, and the thermal wave effect mainly affects the dilatational waves.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"157 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":"121679233","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

Theoretical Investigation of Sound Insulation of Asymmetric Coupled-Membrane Acoustic Metamaterials 非对称耦合膜声学超材料隔声性能的理论研究

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019316

Ding Tong, Hongyan Tian, Yanli Zhang, Xin Li

引用次数: 0

Influence of a Steepened Hill on the Surface Displacement Amplitudes 陡坡对地表位移振幅的影响

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019286

Yun-qiu Song, Xin-zhu Li, Zai-lin Yang, Guan-xi-xi Jiang, Yong Yang

引用次数: 0

Research on Ultrasonic Damage Imaging Based on Total Focus Method 基于全聚焦法的超声损伤成像研究

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019304

Fengzhong Li, Ying Luo, Bing Zhang

{"title":"Research on Ultrasonic Damage Imaging Based on Total Focus Method","authors":"Fengzhong Li, Ying Luo, Bing Zhang","doi":"10.1109/SPAWDA48812.2019.9019304","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019304","url":null,"abstract":"Ultrasonic phased array Total Focus Method (TFM) is used to process the signal with the data obtained by the Full Matrix Capture(FMC) mode, which has the advantages of high imaging accuracy and high signal-to-noise ratio(SNR). However, the frequency dispersion of the Lamb wave largelyaffected the imaging accuracy of the TFM. Therefore, the wavelet analysis time domain filtering in multi-band method was proposed to decompose an ultrasonic wide frequency band signal into several narrow band ones for suppressing dispersion effect, furthermore, the damage signal is extracted without reference signal and thus the damage is imaged in frequency domain, which improves the imaging accuracy. In this paper also analyzes the whole process of ultrasonic excitation, the interaction between the incident wavefield and damage as well as the sensor receiving signal, and establishes a quantitative imaging method of inverse scattering model with the reflectivity of the damaged surface as the index,further improve the imaging accuracy. Moreover, a numerical model and an experimental platform for prefabricated artificial damage of metal aluminum plate were established to compare the imaging effects of TFM in frequency domain and TFM with inverse scattering model in frequency domain. The results show that new algorithm is more accurate in locating damage and has stronger characterization ability.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"2 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":"127211641","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

Acceleration Sensitivity Analysis of Hydrophone 水听器加速度灵敏度分析

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019310

Guo-liang Yan, Xin-ran Xu, Zhen-yu Zheng, Wei Gao

引用次数: 0

Study on Vibration Isolation Performance of Intelligent Periodic Structure for Urban Viaduct 城市高架桥智能周期结构隔振性能研究

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019278

Peng Zhao, Lili Yuan, Zhuolin Ye, B. Wang

引用次数: 0

A High-Power and High-Efficiency Bender Transducer 一种大功率高效弯管传感器

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA) Pub Date : 2019-11-01 DOI: 10.1109/SPAWDA48812.2019.9019242

Ji-wu Liu

{"title":"A High-Power and High-Efficiency Bender Transducer","authors":"Ji-wu Liu","doi":"10.1109/SPAWDA48812.2019.9019242","DOIUrl":"https://doi.org/10.1109/SPAWDA48812.2019.9019242","url":null,"abstract":"Over the past several years,Hangzhou Applied Acoustics Research Institute (HAARI) hasdeveloped the ring transducer,including the air-backed ring transducer(ABRT) and free-flooded ring transducer(FFRT). Previous papers[1][2] described a kind of monostatic ABRT with radially poled ceramic and a broadband monostatic segmented FFRT with tangentially poled ceramic.In order to meet the requirements of small-sizedness,high-power,and high-effciency requirements,HAARI conducted in-depth research on bender disk transducers(BDT).The BDT described in this paper was potted in polyurethane,with a mass of 4.3kg in air.Tt has a maxium diameter of 190 mm.Both projector and hydrophone operation are available.The measured maximum transmitting voltage response(TVR) is 139.1dB//μPa @1m/V,@1.43kHz and the quality factor (Q) is 6.5. The maximum sound pressure level(SPL) is greater than 204.1dB. But in practice the output power of the power-amplifier is small,so the measured SPL is 201.8 dB,and for this measurement was tested at a water depth of 31 m. The acoustic output efficiency at resonance is 93.3% if we assumed the directivity index(DI) is 0.The maximum of the Receiving Voltage Response (RVS) in free field is -156.9dB//V/μPa@1.53kHz.The frequency band with receiving response decreasing 3dB is from 1.4kHz to 1.6kHz.The transducer is robust enough to withstand hydrostatic pressure at 4.5 MPa.","PeriodicalId":208819,"journal":{"name":"2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA)","volume":"11 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":"115165486","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