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舰船
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  naval ship
    The theory had been used broadly in the areas such as railway transports, building architectures, naval ship and mechanical manufactures.
    已广泛应用于铁路交通、土木建筑、舰船及机械制造等行业中。
短句来源
    Aim:To observe the changes of distortion product otoacoustic emission(DPOAE) and action potential (AP) after the exposure to a simulated naval ship engineroom noise.
    目的:观察豚鼠暴露于模拟舰船机舱噪声后畸变产物耳声发射(DPOAE)及听神经动作电位(AP)的变化。
短句来源
  ship radiated
    The study of nonlinear features of ship radiated noise based on phase space reconstruction theory
    基于相空间重构理论的舰船辐射噪声非线性特性研究
短句来源
    Fractal Brownian Motion model of ship radiated noise
    舰船辐射噪声的分形布朗运动模型
短句来源
    Research of simutation technology method of ship radiated noise
    舰船辐射噪声模拟产生技术方法综合研究
短句来源
    NONGAUSSIANITY AND NONLINEARITY TESTSOF SHIP RADIATED NOISE
    舰船辐射噪声的非高斯特性和非线性检验
短句来源
    EXTRACTION OF LOW FREQUENCY LINE SPECTRUM OF SHIP RADIATED NOISE BASED ON THE 1(1/2) D SPECTRUM
    基于1(1/2)维谱的舰船辐射噪声低频线谱成分提取
短句来源
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  “舰船”译为未确定词的双语例句
    A STUDY ON SHIP-RADIATED NOISE RHYTHMS (Ⅱ)——ATUOCORRELATION FUNCTION AND EXTRACTION OF RHYTHM INFORMATION
    舰船噪声节奏的研究(Ⅱ)——自相关函数及节奏信息的提取
短句来源
    Feature extraction of ship-radiated noise using higher-order spectrum
    基于高阶谱的舰船辐射噪声特征提取
短句来源
    Analyzing the ship-radiated-noise with the wavelet-domain HMM model
    舰船辐射噪声的小波域HMM分析
短句来源
    Modeling and Simulation Research of Ship-radiated Noise
    舰船辐射噪声建模及仿真研究
短句来源
    The Application of Wavelet Transformation in Ship-Radiated Noise De-noising
    小波变换在舰船辐射噪声消噪处理中的应用
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  naval vessel
The configuration and aerodynamic performance of the inlet system are important aspects in the process of installing a gas turbine on a naval vessel.
      
Failures of various types of hydraulic couplings used to connect pipes in a naval vessel are described and used to illustrate some of the general procedures for failure analysis.
      
Experimental weather deck EM field level information is available for the HF antennas aboard the LSD-41 class naval vessel.
      
However, in a naval vessel, this is precisely the kind of load effect one should expect from an internal blast event.
      
This was the 11th intrusion by a North Korean naval vessel in 2001.
      
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  naval ship
The data used cover part of the GATE period for station 20 occupied by the Brazilian Naval Ship R/V Sirius in the Equatorial Atlantic (0730 N 4000 W).
      
A Peaceful environment does not necessarily preclude a naval ship from being attacked.
      
A single naval ship can carry and launch many cruise missiles, where as an aircraft is limited in the number of missiles it can carry.
      
Burn intensive care unit aboard the United States Naval Ship Comfort.
      
For naval ship applications, FRC sandwich material systems and molding processes are under development to meet stringent fire resistance requirements.
      
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  ship radiated
Hydrophone, type B>amp;K 8104, was used throughout all measurements of the ship radiated noise.
      


In order to predict the performance of the detection of periodical modulation of ship noise in Gaussian noise background, a simple formula (19) for calculating the MDS (Minimum Detectable Signal) for the detection of periodical modulation of periodically locally stationary narrow-band signal in stationary Gaussian white noise is derived. The formula shows that the detection performance depends on the following four factors: depth of the periodical modulation of the signal; bandwidth of a pre-processor; bandwidth...

In order to predict the performance of the detection of periodical modulation of ship noise in Gaussian noise background, a simple formula (19) for calculating the MDS (Minimum Detectable Signal) for the detection of periodical modulation of periodically locally stationary narrow-band signal in stationary Gaussian white noise is derived. The formula shows that the detection performance depends on the following four factors: depth of the periodical modulation of the signal; bandwidth of a pre-processor; bandwidth and average time of a post-processor. If background noise is not stationary, the detection performance will be worse than that predicted by formula (19). With the view of reducing the error, formula (19) is modified by using the parameter BeqN which is measured in experiments to replace B in formula (19). In the case of nonsltationary background noise, the detection performance depends not only on the above mentioned factors, but also on the nonstationariness of background noise.

为了估算在高斯背景噪声中检测舰船噪声的周期调制的性能,本文导出了在平稳高斯白噪声中检测周期性局部平稳窄带高斯信号的周期调制的最小可检测信号(MDS)的一个简洁公式(19)。式(19)表明,检测性能基本取决于四个因素;信号的周期调制的深度(m_p),前置处理器带通滤波器的带宽B,后置处理器中窄带滤波器带宽B_2和低通滤波器的积分时间T_2。若实际背景噪声偏离平稳,检测性能差于(19)式的估算值。为了减小误差,用实测的参数B_(eqN)代替式(19)中的B来修正式(19)。在非平稳背景噪声时检测性能不仅取决于上面所述的因素,而且与背景噪声非平稳性的强弱有关。

On the basis of the previous paper[1], power spectrum density functions for superposition type modulation envelopes and autocorrelation functions for various types of modulation envelopes are calculated in this paper. The theoretical results are in good agreement with experimental results. According to the theoretical analyses and experimental results given in the two papers, it is found that very rich rhythm information is contained in modulation envelope of ship noise. The pieces of information are directly...

On the basis of the previous paper[1], power spectrum density functions for superposition type modulation envelopes and autocorrelation functions for various types of modulation envelopes are calculated in this paper. The theoretical results are in good agreement with experimental results. According to the theoretical analyses and experimental results given in the two papers, it is found that very rich rhythm information is contained in modulation envelope of ship noise. The pieces of information are directly or indirectly related to physical att ributes of ship itself. The effective extraction of different kinds of rhythm information is very valuable to deducing the work conditions of ship and its own properties from its radiated noise

在前一篇文章的基础上,本文计算了叠加型调制的功率谱密度以及各种调制类型的自相关函数,与实验结果符合良好。研究结果表明,从舰船辐射噪声调制包络的功率谱密度和自相关函数中可以提取与舰船各种物理属性有关的丰富的节奏信息,同时探讨了提取这些节奏信息的有效方法。

Based on the dynamic multi-substructuring method (DMSM) the calculation from the 1st mode to the 30th one of a warship with more then 1000 nodes, 6000 degrees of freedom has been performed. The results show the superiority of the dynamic multi-substructuring me- thod in the dynamic calculation of very large complex structures. Especially, when the messages of some substrcuture is out of order, only the revisions of some substructure are necessary to be performed and the calculation can be carried out continuesly...

Based on the dynamic multi-substructuring method (DMSM) the calculation from the 1st mode to the 30th one of a warship with more then 1000 nodes, 6000 degrees of freedom has been performed. The results show the superiority of the dynamic multi-substructuring me- thod in the dynamic calculation of very large complex structures. Especially, when the messages of some substrcuture is out of order, only the revisions of some substructure are necessary to be performed and the calculation can be carried out continuesly without resolving the eigen equations. Therefore the efficiency of calculation is raised obviously.

本文根据作者提出的分层多重动态子结构法原理计算了一艘具有1 000多个节点、6000多个自由度的舰船的1~30阶的模态,显示了动态子结构法在特大型复杂结构动态计算中的优越性。尤其当某一子结构信息出错时,不必重新计算,只需对该子结构进行改正后再续算,明显地提高了计算效率。

 
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