超音速的飞机只允许在水上飞行，这样就只限于往返于被海洋隔开的富裕的国家——因为声震可以毁坏东西和给在地面上的人产生噪声。
Supersonic flights are allowed only over water-and are thus limited to connecting wealthy cities separated by an ocean-because sonic booms can damage things and annoy people on the ground.
由于具有低噪声输出，并采用了加固设计，它能用于军事与航空应用，包括机载、舰载和地面应用。
With its low noise output and rugged design, the 55lq2 is for military and aerospace programs, including airborne, shipboard, and ground applications.
地面运动加速度功率谱模型为零均值的平稳高斯过程，描述为过滤白噪声施加于支撑各点。
The power spectral density function of ground acceleration can be described as filtered white noise applied on each support point.
首先分析了地面核磁共振信号的特征和奇异噪声的来源与特点，提出了相应的消除方法并进行了仿真研究。
The features of Surface Nuclear Magnetic Resonance(SNMR) signal for underground water and the sources and characters of the spike noise distortion are analyzed.
而随机噪声没有统一的规律，它包括环境噪声、测量误差、地面微震等。
Random noises have uniform rules and they comprise of circumstance noise, measurement error and ground microseism.
本文介绍螺桨飞机舱内噪声的地面模拟方法和主动控制实验。
This paper presents the analogized methods and the active control experiments of the cabin noise for a propeller airplane.
研究了渐硬恢复力刚性滑移结构在水平和竖向高斯白噪声地面作用下稳态响应的概率分布问题。
The probability distribution problem of the steady-state responses to horizontal and vertical Gaussian white noises of rigid sliding structures with hardening restoring force is studied in this paper.
研究了用脉间步进频率雷达对杂波背景噪声下地面或海面动目标的探测。
This paper studies how to detect the moving targets on the land and sea surface in the background of clutters by using pulse-pulse step frequency radar.
建立了某型军用飞机的ANSYS边界元模型，用声学有限元-边界元仿真软件SYSNOISE进行了噪声仿真，获得了飞机噪声在地面附近的辐射结果。
A boundary element model is established, making use of the ANSYS. In the noise simulation SYSNOISE is applied to get estimable simulation results of aircraft noise close to ground.
碎石落回地面可产生附加的直达波和面波噪声。
The debris falling back to earth may generate additional direct and surface-wave noise.
飞行器地面支持设备。一般要求。第4部分：噪声测量方法和噪声降低。
Aircraft ground support equipment - General requirements - Part 4: noise measurement methods and reduction.
在地面数字电视系统中，广播信道存在着突发噪声干扰和随机噪声干扰，而且前者的危害甚于后者。
In digital terrestrial television system, there is much burst and random noise in the broadcasting channel, and burst noise is more harmfully than random noise.
具有结构紧凑，占地面积小，噪声低，无泄漏，安装、管理、维修方便等优点。
It features compact structure, small space required, low noise, no leakage, easy installation and maintenance.
同一测点，不同高度时，近地面处高频交通噪声减弱效果明显；
In the same measuring point, the reduction effect to the noise with high frequency was significant near by the surface.
地震地面运动功率谱模型采用两次过滤白噪声模型，建立了地震地面运动谱强度与最大加速度均值之间的关系。
Its power spectral model is the twice-filtered white noise model. Moreover, the relation between the power spectral intensity and the mean value of maximum ground acceleration is set up.
这项工作可能要长时间地面对噪声环境，而且根据业务数据性质的不同，重要的数据必须实现自动录制。
This kind of work often faces to long time noise. Moreover, some kinds of data must be automatically recorded according to their special character.
这项工作可能要长时间地面对噪声环境，而且根据业务数据性质的不同，重要的数据必须实现自动录制。
This kind of work often faces to long time noise. Moreover, some kinds of data must be automatically recorded according to their special character.
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