Electromagnetic Susceptibility Analysis Method of Electro-Explosive Devices

2012 ◽  
Vol 229-231 ◽  
pp. 949-952
Author(s):  
De Chun Qin ◽  
Dong Lin Su ◽  
Nan Kai Wu
Keyword(s):  
Test Data ◽  
Electromagnetic Interference ◽  
Physical Modeling ◽  
Electromagnetic Compatibility ◽  
Resonance Effect ◽  
Analysis Method ◽  
Full Wave ◽  
Explosive Device ◽  
Emc Design ◽  
Explosive Devices

Electro-explosive device (EED) is easily influenced by electromagnetic interference (EMI) in war-field. To study the electromagnetic susceptibility of EED, the method based on full-wave physical modeling and resonance effect simulation is presented. The EMS of non-contact fuse is analyzed as an example. The test data validate the correction of the EMS analysis method, which is of great value for reference to Electromagnetic compatibility (EMC) design of EED.

Study of Blind Source Separation on Transmission Line EMI

2013 ◽  
Vol 846-847 ◽  
pp. 493-499
Author(s):  
Zi Hua Li ◽  
Chun Yan Xiao ◽  
Shuai Gao
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Spectral Characteristics ◽  
Separation Performance ◽  
Fast Independent Component Analysis ◽  
Fastica Algorithm ◽  
Interference Signals ◽  
Emc Design

The transmission line is an important part of electrical system. Electromagnetic interference (EMI) signals can be picked up by transmission lines in a way of conduction or radiation, and interfere the sensitive devices located in the power source end and the load end, so it is important and necessary to separate and identify the EMI source signals coupling to the transmission lines in order to guide the electromagnetic compatibility (EMC) design and the further EMI diagnosis and suppression. Fast independent component analysis (FastICA) algorithm is studied and programmed, and its feasibility and separation performance are validated via simulation of BSS of three mixed signals and the average signals to interference ratio (SIR) is approximately 30 dB. The model of crosstalk of transmission lines is built and simulated, the interference signals are separated by the FastICA algorithm, and the average SIR is over 20 dB. Periodicity and spectral characteristics of the separated interference signals are analyzed, and the identification of interference signals is realized.

scholarly journals Progress of Electromagnetic Compatibility Design for Unmanned Aerial Vehicles

2020 ◽  
Vol 316 ◽  
pp. 04008
Author(s):  
Yong Wu ◽  
Qishuang Ma ◽  
Ping Xu
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Test System ◽  
System Level ◽  
Aerial Vehicles ◽  
Radiation Test ◽  
Electromagnetic Characteristics ◽  
Emc Design ◽  
At Home

The electromagnetic environment of UAV system was studied, and three key elements of electromagnetic interference(EMI) are analyzed. The research status of electromagnetic characteristics of UAV system at home and abroad was summarized from numerical simulation of EMI, experimental test of EMI and design of electromagnetic compatibility(EMC). The main contents include the research on electromagnetic characteristics of airborne antenna, EMI of data link and its mechanism, electromagnetic characteristics of internal cables, electromagnetic radiation test, electromagnetic conduction test, system-level EMC design, etc. The key technical challenges faced by the research on EMC of unmanned aerial vehicles at home and abroad are pointed out.

scholarly journals Influence of Aircraft Power Electronics Processing on Backup VHF Radio Systems

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 777
Author(s):  
Jan Leuchter ◽  
Radim Bloudicek ◽  
Jan Boril ◽  
Josef Bajer ◽  
Erik Blasch
Keyword(s):  
Power Electronics ◽  
Electromagnetic Interference ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Intermediate Frequency ◽  
Radio Communication ◽  
Very High Frequency ◽  
Switching Power ◽  
Radio Systems ◽  
The Impact

The paper describes the influence of power electronics, energy processing, and emergency radio systems (ERS) immunity testing on onboard aircraft equipment and ground stations providing air traffic services. The implementation of next-generation power electronics introduces potential hazards for the safety and reliability of aircraft systems, especially the interferences from power electronics with high-power processing. The paper focuses on clearly identifying, experimentally verifying, and quantifiably measuring the effects of power electronics processing using switching modes versus the electromagnetic compatibility (EMC) of emergency radio systems with electromagnetic interference (EMI). EMI can be very critical when switching power radios utilize backup receivers, which are used as aircraft backup systems or airport last-resort systems. The switching power electronics process produces interfering electromagnetic energy to create problems with onboard aircraft radios or instrument landing system (ILS) avionics services. Analyses demonstrate significant threats and risks resulting from interferences between radio and power electronics in airborne systems. Results demonstrate the impact of interferences on intermediate-frequency processing, namely, for very high frequency (VHF) radios. The paper also describes the methodology of testing radio immunity against both weak and strong signals in accordance with recent aviation standards and guidance for military radio communication systems in the VHF band.

Dynamic Analysis of Explosive-Metal Interaction in Three Dimensions

1981 ◽  
Vol 48 (1) ◽  
pp. 30-34 ◽  
Author(s):  
G. R. Johnson
Keyword(s):  
Three Dimensional ◽  
Three Dimensions ◽  
Double Pass ◽  
Sliding Surfaces ◽  
Metal Interaction ◽  
Angular Velocities ◽  
Explosive Device ◽  
Metal Interfaces ◽  
Metal Liner ◽  
Explosive Devices

This paper demonstrates the capability to perform three-dimensional computations for explosive-metal interaction problems with complex sliding surfaces. An analysis is performed for an explosive device which accelerates a metal liner known as a self-forging fragment. Results are presented to show the effects of off-center detonation, asymmetric liner thickness, and asymmetric explosive density for an otherwise axisymmetric device. These three-dimensional conditions have little effect on the linear velocities, but they do introduce significant angular velocities to the self-forging fragment. Unlike projectile-target impact computations, which require only a single sliding surface between the projectile and the target, the explosive devices have multiple, intersecting, three-dimensional sliding surfaces between the expanding explosive gases and the various metal portions of the devices. Included are descriptions of the specialized “search routines” and the “double-pass” approach used for the explosive-metal interfaces.

scholarly journals Reduction of Electromagnetic Interference Using ZnO-PCL Nanocomposites at Microwave Frequency

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Abubakar Yakubu ◽  
Zulkifly Abbas ◽  
Nor Azowa Ibrahim ◽  
Ahmad Fahad
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Environmentally Friendly ◽  
Microwave Frequency ◽  
Absorption Properties ◽  
Radio Emissions ◽  
Surface Areas ◽  
Home Appliance ◽  
Coaxial Probe ◽  
Very High

In industrial equipment and home appliance applications, the electromagnetic compatibility compliance directive (ECCD) demands that electromagnetic interference side effects be eliminated or marginally minimized. The equipment must not disturb radio and telecommunication as well as other appliances. Additionally the ECCD also governs the immunity of such equipment to interference and seeks to ensure that this equipment is not disturbed by radio emissions when used as intended. Many types of absorbing materials are commercially available. However, many are expensive and not environmentally friendly. It is in the light of the above that we studied the electromagnetic absorption properties of ZnO-PCL nanocomposites prepared from cheap and abundant resources which are environmentally friendly (zinc and polycaprolactone). The test was carried out using a microstrip, open ended coaxial probe, and vector network analyzer. Amongst other findings, result showed that the ZnO-PCL nanocomposite has the capability of attenuating microwave frequency up to −18.2 dB due to their very high specific surface areas attributed to the nanofillers at 12 GHz.

Исследование влияния вида молниеотвода на спектр электромагнитных помех на антенне под моделью носового обтекателя самолета с использованием искусственной грозовой ячейки

2021 ◽  
Vol 47 (21) ◽  
pp. 51
Author(s):  
А.Г. Темников ◽  
Л.Л. Черненский ◽  
А.В. Орлов ◽  
Н.Ю. Лысов ◽  
О.С. Белова ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Physical Modeling ◽  
Spectral Characteristics ◽  
Electromagnetic Spectrum ◽  
Current Pulses

The results of physical modeling of the influence of solid and segment lightning diverter strips on the spectrum of electromagnetic interference on the antenna under the model of the nose radome of the aircraft under the influence of an artificial thunderstorm cell are presented. It is shown that the use of segment lightning diverter strips leads to the appearance of signals with frequencies up to units of gigahertz in the spectrum on the antenna. The connection between the spectrum of signals on the antenna and the spectral characteristics of current pulses on the lightning diverter strip is established. The influence of discharges along the radome surface and between the segments on the electromagnetic spectrum is revealed interference on the antenna under the radome.

scholarly journals Hubungan Antara Kualitas Guru dengan Prestasi Belajar Siswa pada Mata Pelajaran Housekeeping

Media Wisata ◽  
2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sri Larasati
Keyword(s):  
Student Achievement ◽  
Data Analysis ◽  
Teacher Quality ◽  
Test Data ◽  
Moment Analysis ◽  
Analysis Method ◽  
Improve Performance ◽  
Employment Practices ◽  
The Relationship

Teacher Quality is one factor that determines student achievement, the research to find out the relationship and contribution to the quality of teachers to student achievement in subjects Housekeeping. This Reseach is expected to expective to be useful for teachers to improve performance. To measure student achievement are used Pearson Product Moment analysis method. Of test data analysis can be seen that there is asignificant relationship with the teacher quality anatara student achiement, which toount (7.09423) is greater than ttable (2.021). Whereas the contribution of teacher quality on student achiement is the amount of KP 46.64% while the remaining 53.36% is determinedby other variables is one of the largest employment practices in the industry.

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