Coupling effect of low-frequency electromagnetic pulse on complex electrically large object

2010 ◽  
Vol 22 (11) ◽  
pp. 2679-2683
Author(s):  
黄隽 Huang Jun ◽  
胡云安 Hu Yun’an ◽  
张浩然 Zhang Haoran ◽  
金焱 Jin Yan
Keyword(s):  
Electromagnetic Pulse ◽  
Coupling Effect ◽  
Low Frequency ◽  
Large Object

The Lightning Electromagnetic Pulse Coupling Effect Inside the Shielding Enclosure With Penetrating Wire

Frequenz ◽  
2017 ◽  
Vol 71 (11-12) ◽  
Author(s):  
Xue Jiao ◽  
Bo Yang
Keyword(s):  
Electromagnetic Pulse ◽  
Coupling Effect ◽  
Fdtd Method ◽  
Current Source ◽  
Low Frequency ◽  
Frequency Component ◽  
Lightning Current ◽  
Proper Size ◽  
Practical Engineering ◽  
Difference Time

AbstractTo study the lightning electromagnetic pulse (LEMP) coupling and protection problems of shielding enclosure with penetrating wire, we adopt the model with proper size which is close to the practical engineering and the two-step finite-difference time-domain (FDTD) method is used for calculation in this paper. It is shown that the coupling voltage on the circuit lead inside the enclosure increases about 34 dB, when add 1.0 m long penetrating wire at the aperture, comparing with the case without penetrating wire. Meanwhile, the waveform, has the same wave outline as the lightning current source, shows that the penetrating wire brings a large number of low frequency component into the enclosure. The coupling effect in the enclosure will reduce greatly when penetrating wire has electrical connection with the enclosure at the aperture and the coupling voltage increase only about 12 dB than the case without penetrating wire. Moreover, the results show that though the waveguide pipe can reduce the coupling effect brought by the penetrating wire, the exposing part of penetrating wire can increase the coupling when the penetrating wire outside the enclosure is longer than the waveguide pipe and the longer the exposing part is, the stronger the coupling is.

Characteristics of Band Gap and Low-frequency Wave Propagation of Mechanically Tunable Phononic Crystals with Scatterers in Periodic Porous Elastomeric Matrices

2021 ◽  
pp. 1-34
Author(s):  
Shaowu Ning ◽  
Dongyang Chu ◽  
Fengyuan Yang ◽  
Heng Jiang ◽  
Zhanli Liu ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Coupling Effect ◽  
Low Frequency ◽  
Phononic Crystals ◽  
Band Gaps ◽  
Dynamic Responses ◽  
Acoustic Metamaterials ◽  
Frequency Wave ◽  
Strong Coupling Effect ◽  
The Matrix

Abstract The characteristics of passive responses and fixed band gaps of phononic crystals (PnCs) limit their possible applications. For overcoming this shortcoming, a class of tunable PnCs comprised of multiple scatterers and soft periodic porous elastomeric matrices are designed to manipulate the band structures and directionality of wave propagation through the applied deformation. During deformation, some tunable factors such as the coupling effect of scatterer and hole in the matrix, geometric and material nonlinearities, and the rearrangement of scatterer are activated by deformation to tune the dynamic responses of PnCs. The roles of these tunable factors in the manipulation of dynamic responses of PnCs are investigated in detail. The numerical results indicate that the tunability of the dynamic characteristic of PnCs is the result of the comprehensive function of these tunable factors mentioned above. The strong coupling effect between the hole in the matrix and the scatterer contributes to the formation of band gaps. The geometric nonlinearity of matrix and rearrangement of scatterer induced by deformation can simultaneously tune the band gaps and the directionality of wave propagation. However, the matrix's material nonlinearity only adjusts the band gaps of PnCs and does not affect the directionality of wave propagation in them. The research extends our understanding of the formation mechanism of band gaps of PnCs and provides an excellent opportunity for the design of the optimized tunable PnCs and acoustic metamaterials.

Simulation Study on Coupling Effect under HEMP of Shielding Control Box

2014 ◽  
Vol 551 ◽  
pp. 309-314
Author(s):  
Long Dou ◽  
Bin Chen ◽  
Hai Lin Chen ◽  
Fei Guo
Keyword(s):  
Complex System ◽  
Field Distribution ◽  
Simulation Study ◽  
Electromagnetic Pulse ◽  
Coupling Effect ◽  
Calculation Model ◽  
Shielding Effectiveness ◽  
Coupling Field ◽  
Depth Direction ◽  
Energy Pulse

The coupling effect under HEMP calculation model of the shielding control box is established with the CST software. The shielding effectiveness of the shielding control box with different incidence directions of HEMP were studied on, and the field distribution of the shielding control box was analyzed. The results show that incidence direction of HEMP in the depth direction of the gap and perpendicular to the long side of the gap can provide the worst electromagnetic pulse protection of shielding control box. The coupling field of the complex system box has resonant characters. The gap filled with conductive rubber can effectively reduce the coupling of electromagnetic energy pulse.

Effects of Aperture Amount and Offset on Couplings of Strong Electromagnetic Pulse

2011 ◽  
Vol 130-134 ◽  
pp. 1387-1390
Author(s):  
Xin Ping Zhu ◽  
Bing Cao ◽  
Cheng Long Liu
Keyword(s):  
Field Strength ◽  
Electromagnetic Pulse ◽  
Coupling Effect ◽  
Fdtd Method ◽  
Shielding Effectiveness ◽  
Actual Structure ◽  
Aperture Coupling ◽  
Coupling Mode ◽  
Aperture Arrays ◽  
Difference Time

Aperture coupling is a main coupling mode through which strong electromagnetic pulse can disturb and even damage electronic equipments. The amount, offset and mixed shape of aperture arrays can affect the coupling effect, which is analyzed using finite-difference time-domain (FDTD) method. The field strength coupled increases with the decrease of the slot amount when the total area of aperture is unchanged. The shielding effectiveness is the smallest when the electromagnetic pulse reaches the resonant frequency, which is only affected by the actual structure size of the shielding cavity. Comparing to two direction offset, the single achieved much larger field strength, which is symmetrical about offset center. The coupled field strength is the smallest when the shape of aperture arrays contains round and rectangular.

scholarly journals Modulation Characteristics of Period-One Oscillations in Quantum Cascade Lasers

2021 ◽  
Vol 11 (24) ◽  
pp. 11730
Author(s):  
Binbin Zhao ◽  
Yibo Peng ◽  
Xingguang Wang ◽  
Cheng Wang
Keyword(s):  
Quantum Cascade Lasers ◽  
Optical Feedback ◽  
Coupling Effect ◽  
Modulation Depth ◽  
Low Frequency ◽  
Optical Signal ◽  
Electrical Signal ◽  
Periodic Oscillations ◽  
Quantum Cascade ◽  
Cascade Lasers

Quantum cascade lasers subject to tilted optical feedback produce periodic oscillations, quasi-periodic oscillations, and low-frequency oscillations. This work presents the modulation characteristics of period-one (P1) oscillations in a quantum cascade laser with tilted optical feedback. The electrical signal at the oscillation frequency is more than 50 dB higher than the noise level, and the electrical linewidth is less than 2.0 kHz. This electrical linewidth is about four orders of magnitude narrower than the optical linewidth (around 16 MHz) of the free-running laser, which suggests that the optical sidebands induced by the P1 oscillations are highly coherent with the main optical mode. In addition, the modulation depth of the optical signal is found to be in the range of 1% to 3.5%. In addition, it is verified in the simulations that the P1 oscillations induce not only amplitude modulation but also frequency modulation due to the phase-amplitude coupling effect.

Non-Linear Coupled Analysis for a Moored FPSO in Deepwater of the Gulf of Mexico

2014 ◽  
Author(s):  
Jaime Torres Lopez ◽  
Longbin Tao
Keyword(s):  
Gulf Of Mexico ◽  
Coupling Effect ◽  
Low Frequency ◽  
Time Domain Analysis ◽  
Element Model ◽  
Coupled Analysis ◽  
Hydrodynamic Characteristics ◽  
Mooring Lines ◽  
Restoring Force ◽  
Hydrodynamic Behaviour

An accurate prediction of the global response of a floating production and storage offloading (FPSO) system under harsh environmental conditions is of great importance in order to achieve the reliability and safety operation of the whole system. FPSOs may be subjected to significant resonant oscillations in the horizontal plane due to low frequency (LF) wave effects and wind excitation forces. These characteristics may contribute to the increase in surge due to the low level of viscous hull damping. Additionally, it has been observed that when the water depth increases, the coupled effects (damping, inertia and restoring force) contributions from mooring lines and risers increases. This paper investigates the LF response behavior of a deepwater FPSO unit in the Gulf of Mexico by carrying out a coupled analysis based on a nonlinear time domain analysis. A 3D model based on boundary integrated element method is used to investigate the hydrodynamic behaviour of the floater as well as a 3D finite element model for each of the slender elements representing the mooring lines and risers. The LF motions of a FPSO with a typical arrangement of catenary mooring lines and steel catenary risers is studied for surge, sway and yaw mainly. The hydrodynamic characteristics of the FPSO are studied through both Newman’s approach and the full Quadratic transfer function. The coupling effect of the floater and mooring/riser systems is examined by comparing the tensions in mooring lines/risers and the global responses of the system in six degree of freedom. The nonlinearity of the hydrodynamics of wave-vessel interaction and the dynamic contribution of mooring lines and risers are investigated with storm and hurricane events for a particular location in deep water Gulf of Mexico (GOM).

Analysis of high power electromagnetic pulse coupling effect of photovoltaic panel by using FDTD method

2021 ◽  
Author(s):  
Hai-Sheng Song ◽  
Ya-Tong Hou ◽  
Shan-Luo ◽  
Zheng-Yu Huang ◽  
Shuai Zhu ◽  
...  
Keyword(s):  
High Power ◽  
Electromagnetic Pulse ◽  
Coupling Effect ◽  
Fdtd Method ◽  
Photovoltaic Panel

Coupling effect of ultra wideband electromagnetic pulse on typical fuze

2014 ◽  
Vol 26 (7) ◽  
pp. 73218
Author(s):  
李永亮 Li Yongliang ◽  
闫晓鹏 Yan Xiaopeng ◽  
郝新红 Hao Xinhong ◽  
岳凯 Yue Kai ◽  
金星 Jin Xing
Keyword(s):  
Electromagnetic Pulse ◽  
Coupling Effect ◽  
Ultra Wideband

MODELING AND SIMULATION OF COUPLING EFFECT ON LOW FREQUENCY NOISE IN ADVANCED SOI MOSFETS

2008 ◽  
Vol 08 (01) ◽  
pp. L87-L94 ◽  
Author(s):  
LEILY ZAFARI ◽  
JALAL JOMAAH ◽  
GERARD GHIBAUDO
Keyword(s):  
Film Thickness ◽  
Noise Level ◽  
Coupling Effect ◽  
Silicon Film ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Interface Quality ◽  
Fully Depleted ◽  
Scattering Rate

Low frequency noise modeling and numerical simulation have been carried out to study the influence of the back interface quality and the silicon film thickness in Fully Depleted SOI MOSFETs, with special emphasis on the coupling effect. In devices with a standard film thickness, the noise level is higher than for an equivalent interface in bulk device, which could be a great concern for analog applications. On the other hand, it has been shown that in very thin SOI devices with a symmetrical structure (Double Gate architecture), the reduction of electric field in the silicon film, induces a conduction channel in the middle of the film, away from both interfaces which in turn reduces the scattering rate of carriers, decreasing the noise level.

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