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2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)最新文献

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Acoustic simulation of the slapping mode of piezoelectric micro-jet 压电微射流拍打模式的声学模拟
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364453
Kai Li, Jun-kao Liu, Weishan Chen, Lundun Zhang, ZiXin. Huang
In order to analysis the fluid-structure coupling acoustic properties of a designed piezoelectric micro-jet which is worked at slapping mode, the inside acoustic situation created by the vibration of vibrator is analyzed in this paper depend on the finite element software ANSYS Workbench. The effect of the properties of the liquid and shell to the ejection performance of the micro-jet is analyzed according to the simulation. The natural frequency and vibration mode of the vibrator which is soaked in the water are obtained by the wet-model analysis. The frequency response curves of the displacement and force reaction of the piezoelectric vibrator and the pressure of the nozzle are gained by the harmonic analysis.
为了分析设计的压电微射流在拍打模式下的流固耦合声学特性,本文利用有限元软件ANSYS Workbench对振动器振动产生的内部声学情况进行了分析。根据仿真结果,分析了液体和壳体性质对微射流喷射性能的影响。通过湿模分析,得到了浸水振动器的固有频率和振型。通过谐波分析,得到了压电振子的位移和反力以及喷嘴压力的频率响应曲线。
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引用次数: 2
A line spectrum extraction method of seismic-acoustic signal 一种地震声信号的线谱提取方法
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364541
Xue Han, S. Piao
This paper puts forward a line spectrum extraction method of seismic-acoustic signal. The method is based on the difference in the polarization characteristics between signal and noise. The data of two horizontal channels are analyzed and the frequency domain polarization parameters are extracted by using singular value decomposition (SVD) method. The resolution of the polarization to frequency is improved by using multi-layer autocorrelation. Experimental results show that the polarization method can extract line spectrum adaptively, and the method based on multi-layer autocorrelation has a good line spectrum extraction performance. The signal to noise ratio (SNR) of the spectrum has been greatly improved.
提出了一种地震声信号的线谱提取方法。该方法是基于信号和噪声之间偏振特性的差异。对两个水平通道的数据进行分析,采用奇异值分解(SVD)方法提取频域极化参数。利用多层自相关技术提高了极化对频率的分辨能力。实验结果表明,极化方法能够自适应提取线谱,基于多层自相关的方法具有良好的线谱提取性能。频谱的信噪比(SNR)大大提高。
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引用次数: 0
Programmed data extraction for frequency-temperature behaviour of AlN based SAW sensors 基于AlN的SAW传感器频率-温度行为的程序数据提取
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364474
Ying-ge Li, Lian-xiang Ma, D. Du
The Aluminum Nitride (AlN) thin film based surface acoustic wave sensors have been fabricated by whole CMOS compatible process. In order to study the resonant frequency behavior responses with temperature, S parameters measured by network analyzer of the AlN SAW sensors are processed with the data extraction program through MATLAB software. It is observed the extracted data of resonance frequency show linear relationship with variation of environment temperatures, which indicates we can easily carry out temperature compensation for the fabricated AlN SAW sensors. And the studied AlN based SAW sensor could also be employed as temperature sensor for further wireless sensing applications.
采用全CMOS兼容工艺制备了氮化铝(AlN)薄膜表面声波传感器。为了研究AlN SAW传感器的谐振频率行为随温度的响应,通过MATLAB软件对网络分析仪测得的S参数进行数据提取程序处理。观察到提取的谐振频率数据与环境温度的变化呈线性关系,这表明我们可以很容易地对制备的AlN SAW传感器进行温度补偿。所研究的基于AlN的SAW传感器也可以作为温度传感器用于进一步的无线传感应用。
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引用次数: 2
Structure, dielectric and piezoelectric properties of (0.9−x)(Bi0.95La0.05)FeO3−xPbTiO3− 0.1BaZrO3 ceramics (0.9−x)(Bi0.95La0.05)FeO3−xPbTiO3−0.1BaZrO3陶瓷的结构、介电和压电性能
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364524
Qiang Li, Yingjie Dong, Jinrong Cheng, Jianguo Chen
(0.9-x)(Bi0.95La0.05)FeO3-xPbTiO3-0.1BaZrO3 (BLF-xPT-BZ) ceramics were synthesized by the conventional solid state reaction method. The X-ray diffraction (XRD) results reflected that phase transformation from rhombohedral (R) to tetragonal (T) took place with increasing the PT content, and the coexistence R and T phases were observed at x = 0.35. The dielectric constant (εr), dielectric loss (tanδ), remnant polarization (Pr) and piezoelectric coefficient (d33) increased initially and then decreased with increasing the PT content, and reach to maximum at x = 0.35. The TC, Td, εr, d33, S and kp of 0.55BLF-0.35PT- 0.1BZ were 422 °C, 380 °C, 620, 162 pC/N, 0.3 % and 0.272, respectively. It was interesting that the maximum strain of BLF-xPT-BZ ceramics achieves about 0.3% under the electric field of 75 kV/cm, which was larger than that of BiScO3-PbTiO3 ceramics.
采用常规固相反应法制备了(0.9-x)(Bi0.95La0.05)FeO3-xPbTiO3-0.1BaZrO3 (BLF-xPT-BZ)陶瓷。x射线衍射(XRD)结果表明,随着PT含量的增加,材料发生了由菱形(R)向四方(T)相转变,在x = 0.35处出现了R相和T相共存的现象。介电常数(εr)、介电损耗(tanδ)、剩余极化(Pr)和压电系数(d33)随PT含量的增加先增大后减小,在x = 0.35时达到最大值。0.55BLF-0.35PT- 0.1BZ的TC、Td、εr、d33、S和kp分别为422°C、380°C、620、162 pC/N、0.3%和0.272。有趣的是,在75 kV/cm的电场下,BLF-xPT-BZ陶瓷的最大应变达到0.3%左右,比BiScO3-PbTiO3陶瓷的最大应变要大。
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引用次数: 1
Interaction between band gaps of beam piezoelectric phononic crystal 束流压电声子晶体带隙间的相互作用
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364535
Hao Chen, Shan Jiang, Long-xiang Dai, Hongping Hu
Theoretical models of beam piezoelectric phononic crystal have been proposed, where piezoelectric patches and other elastic structure are arrayed periodically. Each piezoelectric patch is connected by a resonant shunting circuit independently. Three kinds of piezoelectric patches, i.e., bimorph in series and in parallel, and unimorph, are taken into consideration. The coupling interaction between Bragg and locally resonant band gaps is investigated. The numerical results have demonstrates that it is feasible to obtain specific band gaps through adjusting the interaction between band gaps by inductance. This characteristic can enhance the applicability of phononic crystals.
提出了基于压电片和其他弹性结构周期性排列的束流压电声子晶体的理论模型。每个压电片由谐振分流电路独立连接。研究了三种类型的压电片,即串并联双晶片和单晶片。研究了Bragg和局部谐振带隙之间的耦合相互作用。数值结果表明,通过电感调节带隙之间的相互作用来获得特定带隙是可行的。这一特性可以增强声子晶体的适用性。
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引用次数: 0
A piezoelectric energy harvester with vortex induced vibration 一种涡激振动压电能量采集器
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364499
R. Song, X. Shan, Jin-zhe Li, T. Xie, Qilong Sun
This paper presents a piezoelectric energy harvester (PEH) which can convert fluid kinetic energy into electricity with vortex induced vibration (VIV). The PEH is composed by a piezoelectric cantilever beam and a cylinder extension. Dynamic response and energy harvesting of the PEH are studied numerically. It is found that maximum output power can be obtained with optimal resistance and the more power output, the stronger elimination of vibration amplitude. Vibration frequency makes greater contribution on power output at smaller cylinder diameter and decreases with increasing of cylinder diameter. Vibration amplitude plays main role on output power and increases first until reaching peak point with increasing of cylinder diameter. Maximum output power can be obtained with reasonable cylinder diameter.
介绍了一种利用涡激振动将流体动能转化为电能的压电能量收集器(PEH),该能量收集器由压电悬臂梁和圆柱体延伸部分组成。对PEH的动态响应和能量收集进行了数值研究。结果表明,在最优电阻下可获得最大输出功率,输出功率越大,消振幅度越强。振动频率在缸径较小时对输出功率的贡献较大,随着缸径的增大而减小。振动幅值对输出功率起主要作用,随着缸径的增大,振动幅值先增大,直至达到峰值。合理的气缸直径可获得最大的输出功率。
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引用次数: 3
A magnetic energy harvester using functional graded multiferroic cylinders 一种使用功能梯度多铁质圆柱体的磁能收集器
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364536
Yan-ping Zhao, Shuting Lu, D. Kong, Chun-li Zhang
A magnetic energy harvester to collect the energy in an alternating magnetic field is proposed in this contribution. The multiferroic energy harvester presented here consists of a functionally graded piezomagnetic cylindrical layer for collecting magnetic energy and a functionally graded piezoelectric cylindrical layer for conversion to electric energy. A theoretical analysis is performed using the linear equations of piezomagnetic, piezoelectric, and elastic materials. The ME effect and output power of the magnetic energy harvester are investigated. The effects of various physical and geometric parameters are also examined.
在这个贡献中提出了一种磁能收集器来收集交变磁场中的能量。本发明的多铁质能量收集器由用于收集磁能的功能梯度压磁圆柱形层和用于转换电能的功能梯度压电圆柱形层组成。利用压磁、压电和弹性材料的线性方程进行了理论分析。研究了磁能采集器的ME效应和输出功率。还研究了各种物理和几何参数的影响。
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引用次数: 0
Dual-focus scanning in volumetric HIFU ablation: Preliminary simulation study 双焦点扫描在体积HIFU消融中的初步模拟研究
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364475
Ke Li, Jing-feng Bai, Yazhu Chen, Xiang Ji
Volumetric HIFU ablation has been implemented in clinical practice to create large thermal lesion while reducing treatment durations. However, it still takes several hours to cover the whole target using volumetric ablation. Multiple focus intensity patterns have been proved beneficial to create larger lesions. The feasibility of dual-focus scanning in volumetric ablation has been evaluated. Simulations of dual-focus scanning and single-focus scanning were performed with the treatment cells of 4, 8, 12 and 16 mm in diameter. Comparison of both scanning approaches indicates that the dual-focus scanning saves treatment time by 20% and needs lower peak acoustic pressure, therefore the potential cavitation could be avoided. Although the maximum near-field temperatures are slightly higher than single-focus scanning, they are acceptable in HIFU treatment.
体积HIFU消融已在临床实践中实施,以产生较大的热损伤,同时减少治疗时间。然而,体积消融仍然需要几个小时才能覆盖整个目标。多重聚焦强度模式已被证明有利于产生更大的病变。对双焦点扫描在体积消融中的可行性进行了评价。分别对直径为4、8、12和16 mm的处理细胞进行双焦扫描和单焦扫描模拟。两种扫描方式的对比表明,双焦点扫描节省了20%的治疗时间,所需的峰值声压更低,因此可以避免潜在的空化。虽然最大近场温度略高于单焦点扫描,但在HIFU治疗中是可以接受的。
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引用次数: 0
Growth, mechanical property and domains of lead potassium niobate single crsytal 铌酸铅钾单晶的生长、力学性能及畴
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364523
Tian Tian, Wen‐bin Liu, Jiayue Xu
Lead potassium niobate (Pb2KNb5O15, PKN) single crystal with tungsten bronze has been successfully grown by Bridgman method through spontaneous nucleation. Under the optimized growth conditions, the crystal was transparent, cracks free and inclusions free. The mechanical property was measured through the Vickers microhardness technique. The result showed that the relationship between the Vickers' microhardness and load could be described as Hv=1.90P-0.2057GPa. Strip-shaped domains were observed in PKN crystals. The changes of the domains during the temperature increasing process indicated that the Currie temperature of PKN was in the range of 460-470°C.
采用Bridgman法通过自发成核成功地生长出了钨青铜铌酸铅钾(Pb2KNb5O15, PKN)单晶。在优化的生长条件下,晶体透明,无裂纹,无夹杂物。采用维氏显微硬度法测定了合金的力学性能。结果表明:合金的维氏显微硬度与载荷的关系为Hv=1.90P-0.2057GPa。在PKN晶体中观察到条形结构域。温度升高过程中结构域的变化表明,PKN的Currie温度在460 ~ 470℃之间。
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引用次数: 0
Experimental evaluation of targeting accuracy of a B-mode ultrasound-guided phased-array focused ultrasound system using a thermocouple array 热电偶阵列b模超声引导相控阵聚焦超声系统瞄准精度的实验评价
Pub Date : 2015-10-01 DOI: 10.1109/SPAWDA.2015.7364486
Bo-fan Zhou, Shou-bei Wang, Ke Li, Jing-feng Bai, Xiang Ji
Image-guide high-intensity focused ultrasound (HIFU) has been widely used in the treatment of uterine fibroids. However, before HIFU system is ready for use, the targeting accuracy should be known for the safety of important abdominal organs surrounding the target. Researchers have used magnetic resonance (MR) images or computed tomography (CT) to evaluate the targeting accuracy of current MR-guided HIFU systems, whereas these methods cannot be directly used in the ultrasound-guided HIFU (USgHIFU) systems. In this study, a thermocouple array is used in combination with the in-house built acrylic plate to evaluate the targeting accuracy of the existing 112-channel phased-array USgHIFU system. The results of ex vivo experiment demonstrate the feasibility and the efficacy of the thermocouple array in the evaluation, and the targeting accuracy of the USgHIFU system is about 1mm in the focal plane. Thus, this accuracy is adequate for the treatment of uterine fibroids.
图像引导高强度聚焦超声(HIFU)已广泛应用于子宫肌瘤的治疗。然而,在HIFU系统准备使用之前,应了解靶向准确性以及目标周围重要腹部器官的安全性。研究人员已经使用磁共振(MR)图像或计算机断层扫描(CT)来评估当前磁共振引导HIFU系统的靶向准确性,然而这些方法不能直接用于超声引导HIFU (USgHIFU)系统。在本研究中,热电偶阵列与内部自制的丙烯酸板结合使用,以评估现有112通道相控阵USgHIFU系统的瞄准精度。离体实验结果验证了热电偶阵列在评估中的可行性和有效性,USgHIFU系统在焦平面内的瞄准精度约为1mm。因此,这种准确性是足够的治疗子宫肌瘤。
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引用次数: 0
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2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)
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