The electric field intensity (EFI) is important characteristic quantity for evaluating the internal insulation state of cable joints. Based on finite element method, this paper proposes two EFI research methods, field...The electric field intensity (EFI) is important characteristic quantity for evaluating the internal insulation state of cable joints. Based on finite element method, this paper proposes two EFI research methods, field-circuit coupling method and equivalent circuit method. The average EFI of the inner surface of the outer semi-conducting shield can be calculated from the current in the measuring circuit. The relative error between these two methods is about 15%, which roughly proves the consistency of the two methods. Further practical application research enables online monitoring of cable joints.展开更多
针对人体通信技术在可穿戴设备中应用缺少准确的理论分析方法的问题,提出了一种等效电路分析方法。将人体组织的通信信道等效成可解析的阻抗电路,通过对电路的分析计算得到人体通信的信道增益。在此基础上,利用有限元仿真软件HFSS建立...针对人体通信技术在可穿戴设备中应用缺少准确的理论分析方法的问题,提出了一种等效电路分析方法。将人体组织的通信信道等效成可解析的阻抗电路,通过对电路的分析计算得到人体通信的信道增益。在此基础上,利用有限元仿真软件HFSS建立了人体通信模型,仿真结果与等效电路分析方法计算的信道增益差距小于1 d B。仿真分析表明:该分析方法能够准确地描述可穿戴设备中人体通信信道的特性,完善了可穿戴设备中人体通信技术的分析方法。展开更多
文摘The electric field intensity (EFI) is important characteristic quantity for evaluating the internal insulation state of cable joints. Based on finite element method, this paper proposes two EFI research methods, field-circuit coupling method and equivalent circuit method. The average EFI of the inner surface of the outer semi-conducting shield can be calculated from the current in the measuring circuit. The relative error between these two methods is about 15%, which roughly proves the consistency of the two methods. Further practical application research enables online monitoring of cable joints.
文摘针对人体通信技术在可穿戴设备中应用缺少准确的理论分析方法的问题,提出了一种等效电路分析方法。将人体组织的通信信道等效成可解析的阻抗电路,通过对电路的分析计算得到人体通信的信道增益。在此基础上,利用有限元仿真软件HFSS建立了人体通信模型,仿真结果与等效电路分析方法计算的信道增益差距小于1 d B。仿真分析表明:该分析方法能够准确地描述可穿戴设备中人体通信信道的特性,完善了可穿戴设备中人体通信技术的分析方法。
