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- The figures can be used to easily calculate the sound power level of the sound source inside the duct through measuring the SPL at a single point outside of the duct. 利用这些图和简单公式,通过测量管外一点的声压级就可确定管内声源声功率。
- The experimental tests involved the total sound power level, the sound pressure spectra and the sound source directivity of the AFF are firstly presented. 本文首先进行了轴流风扇总声功率、声压频谱及声源指向性等声学特性的实验测试。
- It is shown that the numerical results of the total sound power level and the sound directivity of the original AFF agree well with those results by testing. 结果表明，采用数值计算的方法得到原型轴流风扇的总声功率级和声源指向性与实验测试结果吻合较好。
- After two-grade demarcate, the A/B/C sound pressure level, the gross sound pressure level and the sound power level are produced with the application of A, B, C level fuzzy net. 通过二级标定，引入A、B、C三档模糊计权网络，生成A、B、C三档声级及总声级，求取声功率级，进而依据三段评判对噪声进行进一步的评判。
- Oil pan shoulder function due to the uniqueness of oil cooling, so the oil pan was semi-damping enwrapped in the experimentation , The results showed a piece of sound power level lower 1. 由于油底壳担负着机油散热功能的特殊性,试验对油底壳采用半约束阻尼包裹处理,结果显示整机声功率级降低了1。
- Methods for Measurement Calculation of Sound Emitted by Machinery and Equipment at Work Stations and other Specified Positions from Sound Power Levels. 声源级的工作台或其它特定的场所由机器和设备发出的声音的计算方法。
- The Sound Power Level Calculation of Similar Fans 相似风机声功率级的估算
- Powered mechanical equipments (PME) of sound power levels (SWL) not exceeding those listed in Annex A shall be used. 建造期间使用的低噪音施工设备，其声功率级不能超出附件A所列出的。
- Reverberation room is the special test room that is used in acoustics, 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. 摘要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。
- Determination of sound power level for noise emitted by gear units 齿轮装置噪声声功率级测定方法
- The Direct Calculation for Similar Fan Sound Power Level 相似风机声功率级的直接估算
- Estimation of breakout sound power level due to turbulence caused by an in-duct element 管道内部湍流所引起的泄漏噪声之声强级估算
- Any difference in power level is not significant. 拍子本身的力量等级差异不显著。
- Method for Reverberation Room used for Measurement of Sound Power Level of Reference Sound Sources 标准声源声功率级的混响室检测法
- Determination of sound power level for noise emitted by displacement compressors--Engineering method 容积式压缩机噪声声功率级的测定--工程法
- A Study on the Scanning Path Error for Determing Sound Power Level Using Sound Intensity Scanning 基于扫描声强法的声功率测量扫描路径误差研究
- Method for Semi-anechoic Room Used for Measurement of Sound Power Level of Reference Sound Sources 标准声源声功率级的半消声室检测法
- Test Method for Field Measurement of Sound Power Level by the Two-Surface Method 用双表面法现场测量声功率级的试验方法
- Precision methods for the measurement of sound power level in anechoic and hemi-anechoic rooms 噪声源声功率级的测定-消声室和半消声室精密法
- Method of sound power levels of noise emitted by household sewing machine head 家用缝纫机机头噪声声功率级的测试方法
