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When the vector hydrophone is applied to the underwater platform, the acoustic wave that scattered by the platform has a serious impact on the measuring properties of the vector hydrophone. Regarding to the vector hydrophone's engineering application, a study on the near-field acoustic characteristics of the finite elastic plate is reported. In this paper, the theoretical basis of the finite element...
Partial discharge (PD) measurement method defined in IEC60270 only captures the low frequency energy of measured signals, while more than 95% of the energy is distributed in the range of 30kHz∼30MHz. Thus a high frequency wide band measurement method becomes fashionable to cover the entire bandwidth. In such frequency range, the influence of stray inductance and capacitance become dominant, especially...
In this article, the high precision control problem of relative motion for satellite proximity operations is considered. First, attitude and orbit coupled dynamic models are established. Then, by choosing proper sliding mode surface, a novel sliding mode attitude controller is proposed, which is robust to disturbing torque brought by thrust misalignment and can guarantee attitude tracking errors converge...
Modern aircraft are increasingly packed with advanced and often sensitive electronic systems, making them very vulnerable to electromagnetic interference. Furthermore, the growing communication arena adds rapidly into the environment high power transmitters that produce field strength in excess of a 100 V/m in the vicinity of aircraft flight paths, rendering particularly the high power HF a real hazard...
The problem of coupling between two arbitrarily oriented semi-infinite parallel plate waveguides is investigated numerically using the moment method. Results are obtained for different inclined angles, separations and waveguide widths. Different basis functions and different lengths of segmentation are used to investigate the convergence of the problem. A faster way of computing the integrals is also...
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