Feature extraction of targets radiated-noise is the key technique of passive sonar target recognition system.
目标噪声特征提取是被动声纳目标识别系统的关键技术。
In order to solve the problem of propelle blade-number recognition, the propelle radiated-noise model is built on the basis of five hypotheses.
针对螺旋桨叶片数识别问题，建立了螺旋桨空化噪声信号模型。
On the basis of building the ship radiated-noise model, the mathematical expectation expressions of ship radiated-noise demodulation spectrum harmonic clan feature were educed.
在建立舰船辐射噪声仿真模型的基础上，推导了单、双螺旋桨舰船辐射噪声调制谱谐波族幅值特征的数学期望表达式。
By theoretical derivation and sample analysis, the structure law of ship radiated-noise demodulation -spectrum harmonic clan feature and correlative questions are investigated.
通过理论推导和样本分析，研究了舰船噪声调制谱谐波族特征蕴含的结构特性和应用于识别的相关问题。
Shielding is required because high impedance circuitry is susceptible to pickup of spurious radiated noise.
由于高阻电路容易拾取杂散的辐射噪声，所以需要采取屏蔽措施。
The realization of OSF in the case of real target radiated noise in the background of Gaussian white noise for equal spaced line array is illustrated.
利用真实舰船航行辐射噪声作为目标及干扰，正态分布高斯白噪声作为噪声背景，在基元等间隔线阵上实现了最佳空间滤波器。
More and more automobile enterprises have attached important to research into the control of radiated noise from engine surface.
对发动机表面辐射噪声控制的研究已受到越来越多的汽车生产企业的重视。
This is caused by the complexity of underwater target radiated noise and the variety condition of the sea.
这是由于水下目标辐射信号和海洋环境的复杂性、多变性造成的。
The sound pressure at near distance under free field was computed by using the wave number integration and the basic characteristics of the radiated noise were analyzes.
利用波数积分方法仿真计算了该模型在自由场条件下的近程声场，并分析了近场辐射噪声的基本规律。
An automatic detection and record system for the research of the ship radiated noise is presented.
实现了一种用于研究船舶辐射噪声的自动探测和记录装置。
Period characteristics of radiated noise at high frequency is investigated by a method based on short time Fast Fourier Transformation, and propeller speed is estimated.
用短时傅立叶分析的方法研究了辐射噪声在高频段时频变化的周期性，估计了目标的螺旋桨转速。
A method for extracting modulated information from radiated noise was discussed.
讨论了一种从辐射噪声中提取调制信息的联合方法。
Submarine Guide Vane Propeller is a new device developed by CSSRC to improve powering performance and reduce propeller-radiated noise of submarine.
潜艇前置导叶螺旋桨是CSSRC为提高潜艇快速性和降低螺旋桨噪声而开发的一种新装置。
It also discusses some control methods for reducing the radiated noise from oil pan.
文中还论述了降低油底壳辐射噪声的控制方法。
The result indicates that the method is an effective way to extract the modulated information from radiated noise.
结果表明，该方法用于噪声中调制信息检测是一种有效的手段。
The result shows that acoustic optimization of thin shells of Engine samp may reduce perfectly the radiated noise.
结果表明，对内燃机薄壳结构进行声学优化，可以大大减小噪声辐射。
First, the generation mechanism, components and frequency characteristic of radiated noise of naval ships are studied. There exists periodical modulation for the amplitude of propeller noise.
首先讨论了舰船辐射噪声的产生机理、构成和频率特性，指出螺旋桨噪声的振幅存在周期性调制。
One of the most fundamental and effective methods to reduce automobile noise is the control of radiated noise from engine surface.
控制发动机表面辐射噪声是降低汽车噪声最根本有效的方法之一。
An experimental study on engine surface vibration and radiated noise is carried out in this paper.
本文以一台车用六缸柴油机为例，研究了发动机的表面振动和发动机的表面辐射噪声。
The results show that the method adopted can effectively suppress the radiated noise from cover surface.
结果表明，采用的方法能有效抑制飞轮壳的表面辐射噪声。
A new method of low intensity radiated noise measurement is shown using acoustic combined sensor and combined signal processing with pressure and particle velocity.
本文研究运用组合传感器和声压、振速联合信号处理技术进行低噪声通过特性的测量。
This paper described two methods on how to predict the radiated noise of engine oil pan.
介绍了对发动机油底壳进行噪声预测的两种方法。
The radiated noise of the dynamical mechanism comes from its surface vibration. Controlling the vibration to reduce the radiated noise is a long-term aim for most researchers.
动力机械的辐射噪声产生于结构表面振动，通过控制振动来控制其辐射噪声是机械工程师长期追求的目标。
The paper mainly demonstrates the principles of the noise power pedigrees dispose and radiated noise areas impact in partial coherence analysis.
本文主要分析偏相干分析中噪声信号功率谱的处理及声源辐射面积的大小对相干分析结果的影响这两个问题。
The spectrum of radiated noise from ships consists of a continuous broadband spectrum and a discrete narrow-band line-spectrum.
船舶辐射噪声的功率谱由连续的宽带谱和离散窄带线谱组成。
A method of simulating vessel's radiated noise with specified power spectrum is presented.
给出了一种能够模拟具有指定功率谱特征的舰船辐射噪声的方法。
Feature extraction of targets radiated noise and design of targets classifier are key technique of passive sonar target recognition system.
目标噪声特征提取和目标分类器设计是被动声呐目标识别系统的关键技术。
Feature extraction of targets radiated noise and design of targets classifier are key issues of passive sonar target recognition system.
目标噪声特征提取和目标分类器设计是被动声纳目标识别系统的关键技术。
The first part is about the features extraction, including the estimation of source level of the ship-radiated noise and the line extraction of the rotation frequency of propeller noise spectrum.
首先是舰船辐射噪声特征量的提取，包括舰船总声源级的估计和螺旋桨轴频线谱的提取。
The results show that main progress has been made towards controlling structurally radiated noise by adaptive active means applied directly to the vibrating structure.
通过对该控制系统简化分析，从理论上探讨结构声自适应主动控制系统鲁棒性能及其最优实现问题。
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