radiation of sound

Research on utilizing sound attenuation baffle control radiation of sound in the ventilation duct tuyere of air supply and air return

采用消声障板控制通风管路送、回风口声辐射的研究

Experimental Research on Anti-Electromagnetic Radiation Interference of Sound Level Meter

声级计抗电磁场辐射干扰试验研究

The generation and radiation of aerodynamic sound from a low-speed unsteady flow over a two-dimensional automobile door cavity is simulated by using a source-extraction-based coupling method .

本文采用了声源提取的耦合方法来模拟汽车门缝低速非定常流动的气动噪声的产生和传播。

Near field acoustic holography ( NAH ) based on wave superposition approach ( WSA ) is proposed and applied to radiation analysis of sound sources with arbitrarily shaped surface .

提出了基于波叠加法的近场声场全息技术，并将其用于任意形状物体的声辐射分析。

But this method exists some difficulties when used to control exhaust noise , e.g. , the selection of reference signal , the system identification for error acoustic path , the radiation power of secondary sound source , and the poor generality of AANC .

但是将这种方法运用于排气消声时，将面临参考信号的选择、误差通道的辨识、次级源的配置和主动控制的算法的通用性差等问题。

On acoustic radiation of finite length line sound source

浅述有限长度线声源的声辐射

Influences of various types of damages on natural frequencies , vibration modes , acoustic radiation power and directivity of sound are studied .

考虑到不同损伤存在形式，计算分析了损伤对振动频率、模态以及声辐射特性的影响。

The thesis studies the sound radiation law of the gearbox sound source , proves that the fault information in a gearbox can be radiated out with the sound signal .

研究了变速箱声源的声辐射规律；论证了坦克变速箱内的故障信息能由箱体的声信号辐射出来。

Base on the theory of dynamics and acoustic radiation and choosing the stiffened plate as example , the characteristics of natural frequency , static response , exited vibration , power of radiation and directivity of sound are researched respectively .

本文采用结构动力学和声辐射的有关理论，以加筋板结构为例，分别研究了水中含损伤结构的固有振动特性、静力特性、强迫振动特性、辐射声功率、辐射指向性等特性参数。