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极低频噪声
相关语句
  elf noise
     SUPERPOSITION OF ELF NOISE MAGNETIC FIELD MITIGATES THE ADVERSE SPACE LEARNING OF RATS IN WATER MAZE TO CW MICROWAVE FIELD(EXPERIMENTAL REPORT)
     叠加极低频噪声磁场诘抗连续微波对水迷宫大鼠认知行为负作用的实验观察
短句来源
  相似匹配句对
     Motion-induced noise on extremely low frequency H-field antenna
     极低频磁场天线运动感应噪声研究
短句来源
     WHITE NOISE
     白噪声
短句来源
     A recommended acceptable noise level can be determined from the teacheras response to the noise under investigation.
     噪声调查;
短句来源
     Study on Motion-induced Noise in the Design of Extremely Low Frequency Omni-directional Receiving Antenna of Submarine
     潜艇极低频全向接收天线中运动感应噪声研究
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  elf noise
Mutual correspondence between the behaviour of the luminous auroral patches and the appearance of ELF noise type hiss emissions and VLF chorus trains was found in two intervals chosen for analysis.
      
It is concluded that the absence of electromagnetic VLF and ELF noise during times when MLCD develops is the result of the shift of the unstable spectrum to low frequencies.
      
Cross correlation of power spectra of natural elf noise
      
The correlation function of the power spectra of natural elf noise at different frequencies is obtained.
      


A sailing vessel is a strong viberating and yawp source.The pressure wave caused by the vibration and yawp in seawater transmits into seafloor and induces elastic wave in seabed,so called seafloor seismic wave of sailing vessel.The seafloor seismic wave by sailing vessel is capable of identifing vessel target,even serves the target detecting signal of marine weapons.The wave equations and corresponding FEM of seafloor seismic wave of are developed,and a numerical simulation to seafloor seismic wave induced by...

A sailing vessel is a strong viberating and yawp source.The pressure wave caused by the vibration and yawp in seawater transmits into seafloor and induces elastic wave in seabed,so called seafloor seismic wave of sailing vessel.The seafloor seismic wave by sailing vessel is capable of identifing vessel target,even serves the target detecting signal of marine weapons.The wave equations and corresponding FEM of seafloor seismic wave of are developed,and a numerical simulation to seafloor seismic wave induced by the hydraulic pressure field of seaboat and low frenquent sound source point is carried out in a two dimensional hemisphere and layered sea circumstance.The acceleraion and sound pressure on the surface of seafloor are obtained.The simulation result shows that the long distance seafloor seismic wave of sailing vessel is basically produced by the low frequent yawp of sailing vessel within 1 to 7 Hz.

航行舰船是一个很大的振动和噪声源,其振动和噪声引起的压力波经由流体介质传播到海底,引起海底岩层振动,产生弹性波并向远处传播,这种航行舰船在海底引起的弹性波称为舰船海底地震波。舰船海底地震波可用于识别舰船目标,作为水中武器的目标探测信号。基于波动理论,得到了舰船引起海底地震波的波动方程和有限元数值计算模型。利用该模型,对二维半无限空间层状海洋环境在水压场和极低频点声源作用下的海底地震波信号进行了数值模拟,得到了远场海底表面处加速度和水压的时域频域信号。结果表明,在二维半无限空间层状海洋环境条件下,舰船远场海底地震波主要由舰船极低频的噪声辐射引起,主要频率范围在1-7Hz。

 
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