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射流噪声
相关语句
  jet noise
     A kind of shield method for reducing supersonic gas impinging jet noise
     一种超声速气体冲击射流噪声的屏蔽抑制方法
短句来源
     In recent years,research on jet noise has made much headway.
     对不同喷口直径的单股亚音速射流及非设计状态超音速射流噪声场进行了试验研究,获得了射流噪声的总声压场分布特性.
短句来源
     Experimental Study of Characteristics of Jet Noise Field
     射流噪声场特性的试验研究
短句来源
     Numerical results show that the jet noise disturbed by jet flow has the directivity and reaches maximal value between 20° and 30° diverged from the flow direction. The directivity and the intensity is attenuating while the propagation distance is increasing.
     模拟结果表明:射流噪声在喷注的扰动下具有很强的方向性,在离开对称轴20°~30°附近存在最大声压,且噪声方向性和强度随着传播距离的增大而逐渐减弱.
短句来源
     To deal with the complicated jet noise, wavelet frequency band spectrum and shock wave intensity index is defined on the base of wavelet coefficient.
     针对测试数据中所含有复杂的射流噪声 ,定义了基于小波系数的小波频带能量谱和冲击波的强度指数。
短句来源
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  “射流噪声”译为未确定词的双语例句
     Experimental investigation on noise characteristics of jets impinging on concave and convex plates
     凹凸板冲击射流噪声特性的实验研究
短句来源
     Secondly, the generation process rocket launching noise and its relationship with rocket exhaust has been gained by experimental study of free exhaust. Its formation and developing mechanism is deduced.
     其次,通过对火箭自由射流噪声的实验研究,揭示了火箭发射噪声与燃气射流的关系,并说明了其形成的机理。
短句来源
     The characteristic of rocket noise is also one of the important factors in integration of rocket system.
     火箭燃气射流噪声特性也是武器系统集成化所考虑的重要因素之一。
短句来源
     Wavelet analysis was applied to obtain frequency band energy spectrum of pressure data based on wavelet coefficient. Pressure changing with low frequency was extracted by wavelet filter. The relationship between shock impulse on the cover and amplitude of shock oscillation was also obtained.
     实验测量了对发射管壁静压和密封盖受到的燃气射流冲击压力 ,利用子波分析方法求取了实验数据的基于子波系数的频带能量谱 ,并对含有射流噪声的测量数据进行了子波滤波 ,得到了各点压力低频成分的变化情况 ,同时得到了密封盖所受冲击冲量与激波振荡幅值的关系。
短句来源
     Shock cell structure plays a crucial role in the generation of jet screech and broadband shock noise in supersonic jet. The shock cell spacing is a fundamental parameter for predicting the jet screech frequency.
     在超声速射流噪声的产生中 ,喷嘴出口的激波栅格结构有关键的作用 ,激波栅格的间距是推测激波噪声基频的基本参数。
短句来源
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  相似匹配句对
     Experimental Study of Characteristics of Jet Noise Field
     射流噪声场特性的试验研究
短句来源
     On the Characteristics and Mechanism of the Discrete Frequency Noises of Impinging Jet
     冲击射流离散频率噪声的特性及机理
短句来源
     and noise group (N. G.)
     和噪声组(N.G.)
短句来源
     A recommended acceptable noise level can be determined from the teacheras response to the noise under investigation.
     噪声调查;
短句来源
     Insertion fluidic flowrate meter
     插入式射流流速计
短句来源
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  jet noise
The discrete component in the jet noise spectrum has been studied in [1-7].
      
The results of an experimental study of the effects of different nozzle heads on turbulent jet noise are analyzed.
      
The acoustic properties of supersonic jet noise from a convergent-divergent nozzle with a baffle have been studied experimentally over the range of nozzle pressure ratios from 2.0 to 8.0.
      
The effect of reflector with sound-absorbing material on supersonic jet noise
      
This paper describes an experimental work to investigate the effect of a reflector on supersonic jet noise radiated from a convergent-divergent nozzle with a design Mach number 2.0.
      
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In recent years,research on jet noise has made much headway.Zaman in 1986[4] established a rela- tion between turbulence maxima and location of jet noise in subsonic jet.Ahuja et al in 1987[5] calculated

对不同喷口直径的单股亚音速射流及非设计状态超音速射流噪声场进行了试验研究,获得了射流噪声的总声压场分布特性.结合射流流场结构,速度场和湍流场实验研究结果,讨论了噪声源和声场分布特性,以及喷口直径、唇部厚度、压缩性和封闭空间对噪声场特性的影响.

The intensity of shock wave in launching exhaust field of rocket and missile has been analyzed by using of wavelet technology. To deal with the complicated jet noise, wavelet frequency band spectrum and shock wave intensity index is defined on the base of wavelet coefficient. Through the analysis of shock wave pressure time history data with wavelet decomposition and wavelet frequency band spectrum, the frequency band in whch shock wave energy concentrates is determined. The shock wave intensity of different...

The intensity of shock wave in launching exhaust field of rocket and missile has been analyzed by using of wavelet technology. To deal with the complicated jet noise, wavelet frequency band spectrum and shock wave intensity index is defined on the base of wavelet coefficient. Through the analysis of shock wave pressure time history data with wavelet decomposition and wavelet frequency band spectrum, the frequency band in whch shock wave energy concentrates is determined. The shock wave intensity of different test position is compared with the use of intensity index.

利用小波分析技术对火箭导弹发射时产生冲击波的强度进行了分析。针对测试数据中所含有复杂的射流噪声 ,定义了基于小波系数的小波频带能量谱和冲击波的强度指数。通过对冲击波压力 -时间历程数据的小波分解和小波频带能量谱的分析 ,确定了冲击波能量所集中的频带 ,并且利用强度指数对不同测点的冲击波强度进行了比较

A set of experimental studies were conducted to study complicated internal exhausted flow field generated by missile which was launched from a closed container-launcher.Wavelet transform method was used to analyze the wall pressure-time history data,and shock wave oscillation(low frequency)and jet noise (high frequency) were found in the exhausted flow section.Shock wave oscillation is attenuated along launcher wall at the direction to missile head.Its energy focuses on low frequency band and it is harmful to...

A set of experimental studies were conducted to study complicated internal exhausted flow field generated by missile which was launched from a closed container-launcher.Wavelet transform method was used to analyze the wall pressure-time history data,and shock wave oscillation(low frequency)and jet noise (high frequency) were found in the exhausted flow section.Shock wave oscillation is attenuated along launcher wall at the direction to missile head.Its energy focuses on low frequency band and it is harmful to container-launcher along with initial shock wave.

为研究火箭导弹在封闭式储运发射箱内发射时 ,由于密封盖的反射作用使弹箱间隙内存在的复杂燃气流场 ,通过对测量数据进行子波分析 ,得到了管 (箱 )壁压力时间历程曲线中的燃气射流段是由射流激波振荡 (低频 )和射流噪声 (高频 )两种流动成分组合而成 ,激波振荡沿管壁向弹头方向是衰减的 ,它在低频段聚积的能量与起始冲击波一起都对储运发射箱式定向器具有破坏作用。

 
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