通过无量纲分析船模螺旋桨噪声可以预报实船的螺旋桨噪声。
Ship propeller noise can be predicted by non-dimensional analysis of ship model propeller noise.
实船试验表明，该合金螺旋桨比铜合金螺旋桨噪声有较大幅度降低。
Ship sailing tests show the propellers made of this alloy have much lover noise than copper alloy propellers.
本文介绍上海交通大学空泡筒进行螺旋桨噪声试验研究情况及部份结果。
This article describes the propeller noise tests in JTU cavitation tunnel and some of these test results obtained.
螺旋桨噪声的预报对评价螺旋桨声学性能及螺旋桨声学设计有非常重要的意义。
To predict the noise of the warship propeller is significant for estimating the propeller's acoustical performance and designing low noise propeller.
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。
Submarine Guide Vane Propeller is a new device developed by CSSRC to improve powering performance and reduce propeller-radiated noise of submarine.
探讨了一种新型的潜艇流噪声与螺旋桨噪声的模型试验方法——自航模水动力噪声测试技术。
Comparison between the simulations of flow-noise of a submarine-like body with four different turbulent models;
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。
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.
整个方法对船舶螺旋桨噪声预报提供了工具，对螺旋桨的噪声控制及低噪声设计也有重要的工程价值。
The methods will not only make a key tool for noise prediction, but also play a role for noise control of the propeller in engineering project.
指出螺旋桨噪声、水动力噪声和设备机座机械噪声被有效抑制后，管道系统便成为“安静型”潜艇的主要噪声源。
Then the pipe system becomes the main noise resource of quite submarine, when propeller noise, hydrodynamic noise and machinery noise of facility base are controlled effectively.
本文根据某船螺旋桨的噪声测量和激振试验结果，描述了螺旋桨鸣音的特点和产生鸣音的机理。
Peculiarities and mechanism of propeller singing are described based on results of acoustic measurements and vibration excitation tests of a Marine propeller.
结果表明，螺旋桨空泡噪声由连续谱和离散线谱组成。
It is shown that propeller cavitation noise is composed of continual spectrum and separable line spectrum.
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。
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.
最后讨论了新模拟方法在船后螺旋桨空泡与噪声模型试验中的应用。
Finally the application of the new modeling method to model test of cavitation and noise of propeller working behind is discussed.
并以模型试验的方法研究了不同充气方式和充气量对螺旋桨水动力和辐射噪声的影响。
The effects of different jet mode and air amount on propeller's hydrodynamics and radial noise are also studied by model tests.
因而对螺旋桨离散谱噪声进行预报控制至关重要。
针对这一特征，考虑利用激光光源在远处水下产生空化噪声作为假目标，用来模拟潜艇螺旋桨产生的空化噪声。
Make use of the laser-generated cavitation noise to generate false target based on this property, which is simulation of the cavitation noise generated by submarine propeller.
通过WVIS -ME45隔振器的轴向弹性变形来传递螺旋桨的推力，有效地控制了船舶推进系统的振动和噪声。
It is efficient to control the vibration and noise of the propulsion system since the thrust is transmitted by axial elastic deformation of WVIS-ME45 vibration isolator.
研究螺旋桨空泡及其诱导的船体脉动压力的预报方法，对于减小其引起的船尾振动和辐射噪声是极其重要的。
It is very important to study methods for predicting propeller cavitation and induced fluctuations in order to reduce vibrations and noise on ships.
螺旋桨空泡会降低螺旋桨性能，产生空化剥蚀和噪声，从而导致船体振动。
Propeller cavitation degrades propeller performance, erodes blade surfaces, produces noise, and causes vibration on the ship hull.
由螺旋桨引起的互作用噪声构成了船舶中高速航行时整个辐射噪声的重要部分。
The interaction noise induced by propeller has constituted the main part of the noise radiated from the medium-speed or high-speed marines.
讨论了螺旋桨导边充气对其水动力性能和辐射噪声的影响。
This paper discusses the effects of air jet in the leading edge of propeller on its hydrodynamics and radial noise.
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 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.
本文给出了上海船研所空泡水筒的背景噪声和ITTC标准螺旋桨的噪声测量结果。
This paper gives the measurement results of the background noise in SSSRI cavitation Tunnel and the cavitation noise of the ITTC standard propeller model.
据此理论模型，导得螺旋桨空泡噪声谱的表达式。
On the basis of above theoretical model, the spectrum formula of propeller cavitation noise has been derived.
目的对磁共振的螺旋桨技术就图像信噪比、对比度噪声比、伪影等图像质量要素进行相关性研究。
Objective Study on the relationship of Propeller technology and image quality such as signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) and artifact.
探讨舰船螺旋桨空泡噪声指数衰减型随机脉冲序列的理论模型。
The present paper deals with theoretical model of random sequence of exponential attenuate acoustic pulses caused by ship propeller cavitation noise.
阐述了螺旋桨空泡的形成机理，对其产生的噪声及其噪声谱作了分析；阐述了激光空泡噪声的原理，分析了激光产生噪声的机制。
This article elaborated the formation mechanism of propeller cavitation, the noise and the cavitation noise spectrum which produced by the bubbles were analyzed.
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。
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.
在分析螺旋桨低频宽带噪声成因的基础上得到了理论计算方法，并作了数值计算。
According to mechanism of low frequency broadband noise of the propeller, theoretical analysis method is given and numerical calculation of the noise is carried out as well.
在分析螺旋桨低频宽带噪声成因的基础上得到了理论计算方法，并作了数值计算。
According to mechanism of low frequency broadband noise of the propeller, theoretical analysis method is given and numerical calculation of the noise is carried out as well.
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