针对单级LC谐振型电场耦合式水下无线电能传输(electrical-field coupled power transfer,ECPT)系统的输出功率低、谐振容量小、频率漂移大等关键问题,设计一种更适于海水环境下的无线电能传输系统。该系统基于CLC-S调谐网络,综合E类放...针对单级LC谐振型电场耦合式水下无线电能传输(electrical-field coupled power transfer,ECPT)系统的输出功率低、谐振容量小、频率漂移大等关键问题,设计一种更适于海水环境下的无线电能传输系统。该系统基于CLC-S调谐网络,综合E类放大器效率高、频率高等优点,实现较大的功率输出。利用Maxwell有限元仿真软件,对海水环境下耦合机构的电容值进行了有限元分析。通过对水下耦合机构进行试验,分析负载品质因数Q、归一化频率μ对水下无线电能传输系统的影响规律,可为水下ECPT系统设计提供参考。展开更多
A set of metallic specimens containing fatigue cracks with different sizes were tested using eddy current pulsed thermography(ECPT),therefore the relations between heating response of the crack area and the crack leng...A set of metallic specimens containing fatigue cracks with different sizes were tested using eddy current pulsed thermography(ECPT),therefore the relations between heating response of the crack area and the crack length was studied.The numerical and experimental results both showed that the increase of the crack length enhanced the crack heating response under specific test conditions.A particular form of calculated response signal,which is linearly related to the crack length,was introduced to provide a quantitative evaluation of crack length.展开更多
为了探究不同检测条件对裂纹生热特性的影响及其最优化的选择,采用控制变量法探究了提离距离、激励强度和激励时间等检测条件对裂纹区域生热的影响规律。基于检测条件对裂纹生热的影响分析,采用多元非线性回归模型估算了特定检测条件下...为了探究不同检测条件对裂纹生热特性的影响及其最优化的选择,采用控制变量法探究了提离距离、激励强度和激励时间等检测条件对裂纹区域生热的影响规律。基于检测条件对裂纹生热的影响分析,采用多元非线性回归模型估算了特定检测条件下裂纹检出概率(Probability Of Detection,POD),最终确定了检测条件的优化选择范围。上述检测条件的优化方法为涡流脉冲热像(Eddy Current Pulsed Thermography,ECPT)检测中检测方案的制定提供了理论指导。展开更多
文摘针对单级LC谐振型电场耦合式水下无线电能传输(electrical-field coupled power transfer,ECPT)系统的输出功率低、谐振容量小、频率漂移大等关键问题,设计一种更适于海水环境下的无线电能传输系统。该系统基于CLC-S调谐网络,综合E类放大器效率高、频率高等优点,实现较大的功率输出。利用Maxwell有限元仿真软件,对海水环境下耦合机构的电容值进行了有限元分析。通过对水下耦合机构进行试验,分析负载品质因数Q、归一化频率μ对水下无线电能传输系统的影响规律,可为水下ECPT系统设计提供参考。
基金supported by the Open Foundation of Key Laboratory of Nondestructive Testing of Ministry of Education of Nanchang Aeronautical University
文摘A set of metallic specimens containing fatigue cracks with different sizes were tested using eddy current pulsed thermography(ECPT),therefore the relations between heating response of the crack area and the crack length was studied.The numerical and experimental results both showed that the increase of the crack length enhanced the crack heating response under specific test conditions.A particular form of calculated response signal,which is linearly related to the crack length,was introduced to provide a quantitative evaluation of crack length.
文摘为了探究不同检测条件对裂纹生热特性的影响及其最优化的选择,采用控制变量法探究了提离距离、激励强度和激励时间等检测条件对裂纹区域生热的影响规律。基于检测条件对裂纹生热的影响分析,采用多元非线性回归模型估算了特定检测条件下裂纹检出概率(Probability Of Detection,POD),最终确定了检测条件的优化选择范围。上述检测条件的优化方法为涡流脉冲热像(Eddy Current Pulsed Thermography,ECPT)检测中检测方案的制定提供了理论指导。
