• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>NDT & E international >Measurement of electromagnetic properties of heat exchanger tubes with model-based eddy current technique
【24h】

Measurement of electromagnetic properties of heat exchanger tubes with model-based eddy current technique

机译：基于模型的涡流技术测量换热管的电磁性能

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

Electromagnetic properties of heat exchanger tubes with outside diameter in the range from 15.8 mm to 25.3 mm and wall thickness in the range from 0.63 mm to 1.6 mm made of SAF 2205, Type 439 and Sea-Cure were determined with model-based eddy current technique. Two encircling eddy current measurement sensors with uniform field were optimized and designed based on initial computer modeling results. A precision measurement circuit was assembled with the sensors and a lockin amplifier. Sensor computer models were built and validated through direct magnetic and voltage measurements. The sensor magnetic field uniformity was tested and agreed very well with model predictions. The sensor resonance frequencies were verified to ensure resonance effects would not interfere with the measurement process. The tubes' electrical conductivity and initial magnetic permeability were determined through optimization process minimizing the "cost" (objective) function at three frequencies 200 Hz, 1 kHz, and 2.5 kHz. The agreement between the eddy current and other conventional destructive magnetic and electrical measurements was very good where relevant comparison was possible.
机译：用基于模型的涡流技术测定了外径为15.8 mm至25.3 mm且壁厚为0.63 mm至1.6 mm的SAF 2205、439型和Sea-Cure制成的换热器的电磁性能。基于初始计算机建模结果，优化设计了两个具有均匀磁场的环绕涡流测量传感器。精密测量电路与传感器和锁定放大器组装在一起。建立了传感器计算机模型，并通过直接磁和电压测量对其进行了验证。测试了传感器磁场的均匀性，并与模型预测非常吻合。验证了传感器的共振频率，以确保共振效应不会干扰测量过程。通过在200 Hz，1 kHz和2.5 kHz三种频率下将“成本”（目标）函数最小化的优化过程来确定管的电导率和初始磁导率。在可能进行相关比较的情况下，涡电流与其他常规破坏性电磁测量之间的一致性非常好。

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