Jet Engine Electromagnetic Interference Test Requirements and Test Method

2002 ◽  
Author(s):  
Keyword(s):  
Electromagnetic Interference ◽  
Test Method ◽  
Jet Engine ◽  
Interference Test ◽  
Test Requirements

Study of Biaxial Rotational Oscillating Sphere-Block Wear Test

2013 ◽  
Vol 740 ◽  
pp. 644-648
Author(s):  
Yun Fei Liu ◽  
Xue Jin Shen ◽  
Xiao Yang Chen
Keyword(s):  
Tribological Property ◽  
Wear Test ◽  
Test Method ◽  
Test Machine ◽  
Pilot Test ◽  
Rotational Oscillation ◽  
Motion Characteristics ◽  
Test Requirements ◽  
Block Test ◽  
Oscillating Sphere

Based on the motion characteristics of mechanical oscillating parts, a wear test machine is developed with single drive biaxial rotational oscillating, which can effectively simulate multiaxial rotational oscillation of mechanical oscillating parts and take different kinds of friction couplings wear test. Based on this design, the tribological property of easy wearing material in mechanical oscillating parts is studied and corresponding sphere-block test method is established. Pilot test and demonstration are taken to evaluate the sphere-block test method from feasibility, practicality, reliability and economy aspects. The results are meeting test requirements of tribological property under the condition of composite motion.

scholarly journals Research on Civil Aircraft Flight Test of Power Supply Quality Analysis

2021 ◽  
Vol 2136 (1) ◽  
pp. 012016
Author(s):  
Jingtao Wu ◽  
Pei Wang ◽  
Jin Cai ◽  
Ying Liu
Keyword(s):  
Power Supply ◽  
Flight Test ◽  
Quality Standard ◽  
Test Method ◽  
Quality Analysis ◽  
Quality Test ◽  
Test Characteristic ◽  
Aircraft Flight ◽  
Civil Aircraft ◽  
Test Requirements

Abstract In the process of civil aircraft airworthiness, analyzing power quality is the key to verify whether the power supply system meets the requirements of the clause. This paper makes deep research on the domestic and foreign power supply quality standard files and detailed introduces the characteristics of the power supply quality standard files. Then, comparative and analysis give suggestions which tally with power supply quality test requirements. Finally, define the special power supply quality test method for the practical engineering specifically, and power supply quality test characteristic in civil aircraft flight test, to provide guidance help for the future civil aircraft models.

Anti-interference Test for the New SEP Instrument: CSAMT Study at Dongguashan Copper Mine, China

2017 ◽  
Vol 22 (4) ◽  
pp. 339-352
Author(s):  
Da Lei ◽  
Qing-yun Di ◽  
Jun-jie Wu ◽  
Xing-chun Wang ◽  
Yun-xiang Liu ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Signal To Noise Ratio ◽  
Field Work ◽  
Noisy Environment ◽  
Quality Of Data ◽  
Copper Mine ◽  
Filter Methods ◽  
Temporal Filter ◽  
Interference Test

In this paper, an independently developed device system called Surface Electromagnetic Prospecting (SEP) system was introduced through a CSAMT test at Dongguashan copper mine, east of Tonglin, Anhui province. In this area exists a strong electromagnetic interference including mineral and other human interferences, so there is a big challenge for electromagnetic exploration field work. In order to test the anti-interference ability of our system and ensure the quality of data, we applied both spectral analysis and temporal filter methods to improve the signal-to-noise ratio. After data processing, we obtained better results in our geophysical models and showed that the SEP system is able to obtain stable and reliable data in a complex and noisy environment. Consequently, the anti-interference capability of the SEP system is capable to undertake complicated exploration tasks.

Combined ionizing radiation & electromagnetic interference test procedure to achieve reliable integrated circuits

2019 ◽  
Vol 100-101 ◽  
pp. 113341
Author(s):  
Roger Goerl ◽  
Paulo Villa ◽  
Fabian L. Vargas ◽  
César A. Marcon ◽  
Nilberto H. Medina ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Integrated Circuits ◽  
Electromagnetic Interference ◽  
Test Procedure ◽  
Interference Test

scholarly journals Research on an Electromagnetic Interference Test Method Based on Fast Fourier Transform and Dot Frequency Scanning for New Energy Vehicles under Dynamic Conditions

Symmetry ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1092 ◽  
Author(s):  
Liu ◽  
Zhong
Keyword(s):  
Fourier Transform ◽  
Electromagnetic Interference ◽  
Maximum Amplitude ◽  
High Amplitude ◽  
Test Method ◽  
Dynamic Conditions ◽  
Frequency Scanning ◽  
New Energy ◽  
Characteristic Points ◽  
New Energy Vehicles

In recent years, electromagnetic interference (EMI) of new energy vehicles, including difference mode symmetric interference and common mode asymmetry interference, has attracted the attention of many scholars. So far, EMI tests for new energy vehicles under steady conditions cannot reflect the actual EMI of the running vehicle. The results of EMI test methods based on fast Fourier transform (FFT) under dynamic conditions have worse frequency resolutions, and frequency/amplitude accuracy has low precision. Therefore, this paper proposes an EMI test method based on FFT and dot frequency scanning (DFS) for new energy vehicles under dynamic conditions. The identification method for accelerating, sliding, and braking conditions is studied. A comprehensive EMI key evaluation index system for new energy vehicles is built, including characteristic points with maximum amplitude, area, ratio, and density coefficients for high-amplitude characteristic points. Among them, the maximum amplitude is an index to evaluate extreme values. The ratio of high-amplitude characteristic points is a comprehensive index to evaluate the overall region. The density coefficient is an index to evaluate the local region. Finally, this method is applied to three vehicles. With the same instruments, by reducing the FFT frequency span, the frequency resolution and frequency accuracy increase. The results indicate that the EMI of new energy vehicles can be tested under dynamic conditions with high accuracy according to the operable evaluation indexes.

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