Sound power level; Big Sanxian; acoustic measurement
声功率级；大三弦；声学测试
This paper introduces a method for reverberation rooms used for measurement of sound power levels of reference sound sources.
本文介绍了混响室法检测标准声源声功率级的方法，并对用混响室法检测标准声源声功率级的测量结果进行了不确定度的评定分析。
This paper introduces a method for reverberation room s used for measurement of sound power levels of reference sound sources.
本文介绍了混响室法检测标准声源声功率级的方法，并对用混响室法检测标准声源声功率级的测量结果进行了不确定度的评定分析。
Because in the aviation noise survey process, the instrument position, waits for many factors to be able highly to affect the measurement result, moreover the sound-level meter is unable in the survey process to learn current airplane parameters and so on power condition, not only like this increased the survey error coefficient, moreover enables the data not to have the commeasurability.
由于在航空噪音的测量过程中，仪器的位置，高度等许多因素都会影响到测量结果，而且在测量过程中无法获知当前飞机的功率状态等参数，这样不仅增加了测量的误差率，而且使得数据没有可比性。
In the measurement of sound absorption coefficient in random incidence and determination of sound power levels of noise sources, the reverberation room is used very extensively.
混响室是声学专业的实验室用房，它在测量声波无规入射时材料的吸声系数和测量噪声源的声功率级中得到了广泛应用。
Sound Power Level Measurement of Ruan, a Chinese Traditional Plucked Stringed Instrument;
阮是一种具有两千多年历史的中国弹拨类乐器，起源于秦汉。
Sound Power Level Measurement for Pipa-One of Chinese Traditional Instruments
中国传统民族乐器琵琶的声功率测试
Measurement and calculation of sound pressure level and sound power level.
声压级及声功率级的测量和计算。
With the measurement of average sound pressure level and sound power level, the noise reduction result of the oil pan made by sandwich steel plate was proved.
通过平均声压级和声功率级的测试验证了复合钢板试制的油底壳的降噪效果。
According to the imitation of the curve of sound power measurement error, the method was put forward to determine the size of rectangular measuring surface, the distance from scanning measuring surface to sound source, and the scanning linear density.
根据声功率测量误差仿真曲线，给出了测量机器声功率时矩形测量面尺寸、测量面距声源距离、扫描线密度的确定方法。
The process of worksite measurement applied to marine engine 4135 car without load by cross spectral method and the result of total sound power radiated and acoustic location are discussed in detail.
文中着重介绍了采用双通道互谱法对4135Caf船用柴油机的现场测试的全过程及其结果&柴油机在空载工况下所辐射的总声功率及声源定位。
Acoustics Determination of sound power levels of noise sources using vibration velocity Measurement for seal machinery
GB/T16539-1996声学振速法测定噪声功率级用于封闭机器的测量
Acoustics Determination of sound power levels of noise sources using sound pressure Survey method using an enveloping measurement surface over a reflecting plane
GB/T3768-1996声学声压法测定噪声源声功率级反射面上方采用包络测量表面的简易法
The noise level of a diesel engine is determined through the measurement of its sound power.
对某柴油机进行了声功率的测量，确定了其噪声的声功率噪声水平。
Planar near-field acoustic holography (NAH) is ill-posed due to power leakage of the k-space spectrum of the sound pressure distribution as the measuring distance increases when the measurement aperture is limited.
平面近场声全息方法在全息面大小有限时存在由于测量距离增大而造成全息面空间频域能量泄漏而引起的不适定性问题。
Experimental Analysis of Ultrasonic Testing for Level of Material in Tubular Ball Mill of Fossil-fuel Power Plant; Research of Ball Mill's Material Level Measurement System on Sound-electronic Measurement
火电厂钢球磨煤机料位超声检测的实验研究基于球磨机电声功率谱料位检测系统的研究
Research on Some Key Problems of the Measurement of Sound Power by Scanning Sound Intensity
扫描声强法测量声功率的几个关键问题研究
The testing methods and results dealing with are according to China national standard 《 GB 3796-1996 Acoustics-Determination of sound power levels of noise sources using sound pressure-survey method using enveloping measurement surface over a reflecting plane 》.
测试规范及结果处理按照《GB/T3768-1996声学声压法测定噪声源声功率级反射面上方采用包络测量表面的简易法》方法进行。
The measurement and calculation method of the air noise emitted from diesel engine in accordance with GB/T 1859-2000 is introduced, the values of the weighted noise A surface sound pressure level and sound power level of the prototype of 280 diesel engine have been calculated.
介绍了依据国家标准GBT18592000对柴油机辐射的空气噪声进行测量和计算的过程，并得出280型柴油机样机的噪声A计权表面声压级和声功率级的计算值。
In this paper, the sound power level of large turbogenerator in operating site is determined by means of sound intensity measurement.
本文用声强法在工作现场对大型汽轮发电机组中的发电机部分进行了声功率级测量。