• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>NDE-vol.26; ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >PVDF AND PZT PIEZOELECTRIC WAFER ACTIVE SENSORS FOR STRUCTURAL HEALTH MONITORING
【24h】

PVDF AND PZT PIEZOELECTRIC WAFER ACTIVE SENSORS FOR STRUCTURAL HEALTH MONITORING

机译：用于结构健康监测的PVDF和PZT压电晶片对讲机有源传感器

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Piezoelectric wafer active sensors (PWAS) used in structural health monitoring (SHM) applications are able to detect structural damage using Lamb waves. PWAS are small, lightweight, unobtrusive and inexpensive. PWAS achieve direct transduction between electric and elastic wave energies. PWAS are essential elements in the Lamb-wave SHM with pitch-catch, pulse-echo, phased array system and electromechanical impedance methods. PWAS are charge mode sensors and they can be used as both transmitters and receivers. A model of PWAS is shown in this paper. In vibration, impact detections applications, the PWAS response is strong due to the large dynamic change of strain. In pitch-catch, pulse-echo and phased array applications, PWAS are used to generate and receive Lamb waves and the PWAS response is small. A charge amplifier for PWAS applications is introduced in this paper. PWAS are normally made of piezoceramic Lead Zirconate Titanate (PZT). The structural integrity tests require attachment of PWAS to the material surface and there are critical applications where the rigid piezoceramic wafers cannot conform to curved surfaces. As alternative one can use flexible piezopolymer such as polyvinylidene fluoride (PVDF); such PVDF-PWAS have been studied in this paper. PVDF-PWAS were mounted on a cantilever beam for the free vibration test and on a long rod for the longitudinal impact test. The experimental results of the PZT-PWAS and PVDF-PWAS have been compared with the conventional strain gauge. The theoretical and experimental results in this study gave the basic demonstration of the piezoelectricity of PZT-PWAS and PVDF-PWAS.
机译：结构健康监测（SHM）应用中使用的压电晶片有源传感器（PWAS）能够使用Lamb波检测结构损坏。 PWAS体积小，重量轻，引人注目且价格便宜。 PWAS实现了电波能量与弹性波能量之间的直接转换。 PWAS是Lamb-wave SHM中必不可少的元素，它具有音高捕获，脉冲回波，相控阵系统和机电阻抗方法。 PWAS是充电模式传感器，可以同时用作发送器和接收器。本文显示了PWAS模型。在振动，冲击检测应用中，由于应变的大动态变化，PWAS响应很强。在音高捕获，脉冲回波和相控阵应用中，PWAS用于生成和接收兰姆波，并且PWAS响应很小。本文介绍了用于PWAS应用的电荷放大器。 PWAS通常由压电陶瓷锆钛酸铅（PZT）制成。结构完整性测试要求将PWAS附着到材料表面，并且在某些关键应用中，刚性压电陶瓷晶片无法适应曲面。作为一种选择，可以使用柔性的压电聚合物，例如聚偏二氟乙烯（PVDF）；本文已经研究了这种PVDF-PWAS。 PVDF-PWAS安装在悬臂梁上进行自由振动测试，并安装在长杆上进行纵向冲击测试。将PZT-PWAS和PVDF-PWAS的实验结果与常规应变仪进行了比较。这项研究的理论和实验结果为PZT-PWAS和PVDF-PWAS的压电性提供了基本证明。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号