This is also an important basis to establish transmission Mode of Propeller noise to cabin.
这也是建立螺桨噪声向舱内传播模型的重要依据。
Ship propeller noise can be predicted by non-dimensional analysis of ship model propeller noise.
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。
This article describes the propeller noise tests in JTU cavitation tunnel and some of these test results obtained.
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。
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.
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。
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。
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。
With a low-pitched rumbling noise, the propeller began to rotate.
随着低沉的隆隆声，螺旋桨开始旋转起来。
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。
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。
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.
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。
This paper presents the analogized methods and the active control experiments of the cabin noise for a propeller airplane.
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。
Propeller cavitation degrades propeller performance, erodes blade surfaces, produces noise, and causes vibration on the ship hull.
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。
It is shown that propeller cavitation noise is composed of continual spectrum and separable line spectrum.
结果表明，螺旋桨空泡噪声由连续谱和离散线谱组成。
It is very important to study methods for predicting propeller cavitation and induced fluctuations in order to reduce vibrations and noise on ships.
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。
An acoustic treatment technology of honeycomb sandwich stiffened structure to reduce cabin noise for propeller airplanes is presented briefly.
本文简要介绍了在螺旋桨飞机座舱降噪设计中采用的蜂窝刚度处理技木。
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.
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 interaction noise induced by propeller has constituted the main part of the noise radiated from the medium-speed or high-speed marines.
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。
To predict the noise of the warship propeller is significant for estimating the propeller's acoustical performance and designing low noise propeller.
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。
The present paper deals with theoretical model of random sequence of exponential attenuate acoustic pulses caused by ship propeller cavitation noise.
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。
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。
This paper gives the measurement results of the background noise in SSSRI cavitation Tunnel and the cavitation noise of the ITTC standard propeller model.
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。
According to mechanism of low-frequency broadband noise of the propeller, theoretical analysis method is given and numerical calculation of the noise is worked 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。
This paper discusses the effects of air jet in the leading edge of propeller on its hydrodynamics and radial noise.
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 article elaborated the formation mechanism of propeller cavitation, the noise and the cavitation noise spectrum which produced by the bubbles were analyzed.
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。
On the basis of above theoretical model, the spectrum formula of propeller cavitation noise has been derived.
据此理论模型，导得螺旋桨空泡噪声谱的表达式。
The experiment shows that the design propeller has a lower cavitation noise than the original propeller.
试验表明，用该方法设计的螺旋桨辐射噪声比母型桨有明显的降低。
This article elaborated the formation mechanism of propeller cavitation. , the noise and the cavitation noise spectrum whichproduced by the bubbles were Analyzed.
该文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；
Calculations of some examples show that the dynamic optimal design is better than the conventional one for reducing vibration and noise caused by universal joint propeller shafts.
实例计算表明，采用动态优化方法比采用静态优化方法，对降低万向节传动引起的传动系的振动和噪声将会有更好的效果。
In this paper, the experimental investigation and theoretical study on reduction of the ducted propeller cavitation noise by air injection are presented.
本文介绍用人工喷入空气的方法降低导管螺旋浆空泡噪声的试验和理论研究。
The uniformity of propeller wake has close relationship to noise and vibration problems at ship stern.
艉迹流的均匀性与船艉振动与噪音问题有直接相关性。
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