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- sound powered telephone 声力电话,声动力电话
- sound powered telephone set 无电池电话,声力电话机
- 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。
- 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 acoustic radiation resistance matrix is combined with the velocity vector on a vibration surface to predict the total sound power radiated from the structure. 摘要利用声辐射阻力矩阵和振动面上的速度矢量预报了结构声辐射的总功率。
- An innovative implementation of the skin concept for the reduction of the radiated sound power from a vibrating structure is proposed. 摘要 本文的目的为研究在有限平板之双曲线热传导的正、逆算问题受表面辐射的影响。
- 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。
- The starting response frequency of the sandwich planes heightened and the absorbing sound power at the lower frequency intensified with augmenting honeycomb thickness. 蜂窝芯厚度增加，超振频率增大，声能在低频处的吸收增加；
- 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。
- The hemispherical and the parallelepiped measurement surfaces are investigated as examples.Subsequently, their error models are established on the basis of the common model of sound power measurement. 以半球测量面和平行六面体测量面为例，应用通用模型建立了两种情况下的声功率误差分析模型。
- The sound of the telephone pierced his sleep. 电话铃声把他从睡梦中惊醒。
- The approach used tocalculate the normal velocity of vibrating structure surface and sound pressure isprovide, and a near-field approach is used to obtain the sound power output of avibrating body. (2)分别采用振动模态和声辐射模态方法对结构声辐射进行分析，给出了结构表面法向速度、声场声压分布以及声功率近场计算的求解方法；
- A sound mind is inseparable from a sound body. 健全的精神是与健康的身体是不可分割的。
- To verify the accuracy and reliability of the system, contrast tests on reference sound power source and small motor are performed respectively in a semi-anechoic chamber and a common room. 为了验证噪声检测系统的精度和可靠性，在半消声室和普通房间内，分别对标准声功率源和小型电机作声功率对比测量试验。
- 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。
- Alarmed at the first sound, we hit the dirt. 第一声警报一响我们就迅速卧倒。
- He has told a story which sound not objective. 他讲了听起来不真实的一个故事。
