Bounded-wave Simulator Research Articles

Research on Simulation Algorithm of Bounded Wave Simulator Based on Non-uniform Multi-conductor Transmission Lines and Electric Dipole Theory

Research on Simulation Algorithm of Bounded Wave Simulator Based on Non-uniform Multi-conductor Transmission Lines and Electric Dipole Theory

Simulation and Experimental Study of the Field Distribution of Engine for Electromagnetic Pulse

The protection of electromagnetic pulse (EMP) is important for aircraft due to vulnerable electronic equipments are installed. The control box of engine is also suffering from EMP and seldom studied. Meanwhile, most of work related to EMP protection focus on shielding design. Few works consider the effect of engine shell. The field distribution induced by EMP and its influences on the controller layout are unaddressed. This work will comprehensively investigate the field distribution characteristics of an engine under EMP, which is studied by simulating and experimenting methods. The transmission line matrix (TLM) is used to simulated field distribution of the bounded wave simulator and aero-engine, which provides better placement for equipment under test in the simulator. The field differences of bounded wave simulator and plane wave have been analyzed by using CST software. The feasibility of plane excitation instead of bounded wave simulator model excitation is checked, which has been verified by using the engine model. Then, the distribution characteristics of transverse and longitudinal fields surrounding the aero-engine are obtained, and the surface current distribution of the engine is also obtained in the simulation. The aero-engine simulation is excited by bounded wave simulator under CST software. According to the corresponding monitoring points, the simulated field distribution characteristics are verified by using the largely bounded wave simulator. Finally, the influence of field distribution on the layout of the engine electronic control system is analyzed, which provides a reference for the anti-electromagnetic pulse design of the engine electromagnetic controller.

Experimental analysis of electromagnetic pulse effects on engine fuel electronic control system

In this paper, the fuel electronic control system of the engine as an engine control process is designed and constructed to provide the fuel adjustment function of the aero-engine. Then, the electromagnetic pulse (EMP) experiment is established by exposing it to electromagnetic field pulses of the bounded-wave simulator. Now, the damage threshold is also determined. At the same time, the induced differential voltage and common current signals are measured through the printed circuit board (PCB) port, which is necessary to cause a specific microprocessor to fail. The wavelet transform is employed to establish a time-frequency method to process the induced voltage signal. The susceptible frequency areas and coupling energy distribution are applied to the speed acquisition system. Their characteristics are employed to propose a new electromagnetic interference decrease method in both time and frequency domain. This method could be considered as a useful tool for studying the electromagnetic pulse coupling interference.

NUMERICAL ANALYSIS OF SAFETY ZONE OF A LARGE FLAT-PLATE BOUNDED-WAVE EMP SIMULATOR.

The safety zone of a large flat-plate bounded-wave electromagnetic pulse simulator was analyzed using the 3D electromagnetic simulation software Computer Simulation Technology. First, the double-limit requirement cited from the GB 8702 for an instantaneous pulse was clarified compared with the International Commission on Non-Ionizing Radiation Protection guidelines. This means that both the amplitude of the time-domain waveforms and all frequency components should be satisfied with the respective exposure limits. Then, the leakage field of a large flat-plate bounded-wave simulator was simulated. After analyzing the peak amplitude of an instantaneous electric field in a certain area, the observation points along six directions were specified, and the corresponding amplitudes were given. Furthermore, it was verified that the time-domain electric field of the critical points was satisfied with the frequency-domain exposure limits. Finally, the safety distances lower than the reference levels were given, and the safety zones corresponding to the three common exposure limits were obtained.

Simulation and evaluation of leakage electric field of bounded-wave simulator

ABSTRACTThis paper presents a detailed analysis on the distribution of the electric field inside and outside the bounded-wave simulator excited by HEMP (early part), and the attenuation law of the leakage electric field is verified by a scale-model experiment. Furthermore, at the basis of the energy spectrum distribution of excitation source, the general public and occupational exposures values at different observation points are calculated, and then, the limits of safety ranges are determined according to the guidelines issued by the ICNCP in 1998. The results provide a guidance for people to effectively defend against electric field radiation derived from a bounded-wave simulator.

Numerical analysis on electromagnetic radiation environment of the bounded-wave simulator with a metal plate

This paper presents a detailed analysis of the propagation characteristics of the magnetic field around bounded-wave simulator excited by high-altitude nuclear electromagnetic pulse (HEMP), meanwhile, the effects of thickness, size, electrical conductivity, and magnetic permeability on the magnetic field are discussed. Furthermore, at the basis of the energy spectrum distribution of excitation source, the exposure value of the radiation field is calculated according to GB8702. The results suggest that whether with protective measures or not, the magnetic field derived from HEMP is not harmful to human body in a single test.

椭圆弧型过渡段有界波模拟器

A bounded-wave simulator with ellipse-arc transitional section structure is proposed and designed. The electric field waveform in the simulator is simulated and compared with the tapered transitional section simulator by using the electromagnetic-field simulating software CST. The double exponential pulse with rise time 2 ns, full-width at half-maximum (FWHM) amplitude 25 ns and the step pulse with rise time 2 ns, duration about 80 ns are obtained in the experiment. And a comparison is carried out between the two simulators. The results of simulation and experiment both indicate that the bounded-wave simulator eliminates the interference effectively coming from the discontinuity at the junction of the transitional section and parallel-plate section.