Transient Electromagnetic Topology Theory And Its Application In Electromagnetic Pulse Effects Of Electronic Systems

Electromagnetic topology (EMT) is noted as an effective way to analyze high-power electromagnetic pulses interaction with electronic systems. In convetional EMT, the Baum-Liu-Tesche (BLT) equation is always utilized to compute the responses at the nodes of the network in electronic systems. The BLT equation is a frequency-domain equation, which implies that it can not be employed to solve networks with nonlinear or time-varying termination. However, there are lots of nonlinear elements and devices in actual electronic systems. Consequently, this dissertation aims at studying on EMT to make it suitable for nonlinear systems.Based on the conventional EMTand by using the SPICE models of transmission lines excited by external fields to compute the responses at the nodes of networks, the transient electromagnetic topology (TEMT) method, which can employed for nonlinear systems, is developed. Several typical models are studied by using the TEMT method, and the numerical results are validated experimentally. Then, the TEMT method is utilized to study the electromagnetic-pulse effects of some typical electronic systems. The main contributions of the dissertation can be outlined as follows.1. The TEMT method is developed, which includes the proposal of SPICE models of transmission lines excited by external fields in EMT, the study of transmission lines'loss effect, the study of the feasibility and applicability of lossless transmission lines'SPICE model in EMT, and the development of SPICE models for multiconductor transmission lines excited by nonuniform fields and for shielded cables excited by plane-wave fields and nonuniform fields.2. The program for generating the subcircuit files of the SPICE models is developed.3. Several typical models are studied by using the TEMT method and the numerical results are compared with those obtained experimentally. The agreement validates the TEMT method and its capability for nonlinear systems. The experimental and numerical results are helpful to the design of electronic systems against electromagnetic pulses (EMPs).4. A computer network excited by EMPs of several standards is studied by using the TEMT method. The numerical results provide some data for the design of the computer network against EMPs.