Although it is an important regular musical instrument in Chinese music ensemble,its sound power level has not yet been determined.
但是迄今为止,其声功率级尚未予以测定。
The relationship between the octave band sound power levels of similar and model fans at the corresponding duty points has been found from the research,from which the quick calculation of similar fan octave band sound power level at different duty points is available.
相似设计理论在风机系列化过程中起着越来越重要的作用,为简化相似风机声学性能预估的方法,在原有估算的基础上对相似声学的机理做了进一步的研究,得出了相似风机与原型风机在对应工况点倍频程声功率级之间的直接关系,从而实现了相似风机各工况点倍频程声功率级的快速计算方法。
Determination of sound power level for noise emitted by woodworking machinery
GB/T3770-1983木工机床噪声声功率级的测定
Determination of sound power levels of noise emitted by household electrical appliances
GB/T4214-1984家用电器噪声声功率级的测定
Acoustics--Determination of sound power levels of noise sources using sound pressure--Survey method using a reference sound source
GB/T16538-1996声学声压法测定噪声源声功率级使用标准声源简易法
Acoustics--Determination of sound power levels of noise sources--Precision methods for anechoic and semi-anechoic rooms
GB/T6882-1986声学噪声源声功率级的测定消声室和半消声室精密法
Determination of sound power levels of noise emitted by metal cutting machine tools
GB/T4215-1984金属切削机床噪声声功率级的测定
Determination of sound power level for noise emitted by reciprocating pump--Engineering method
GB/T9069-1988往复泵噪声声功率级的测定工程法
Determination of sound power levels of internal combustion engines noise-Quasi-engineering method
GB/T1859-1989内燃机噪声声功率级的测定准工程法
Determination of sound power level for noise emitted by centrifuger separator and filter - Engineering method
GB/T10894-1989分离机械噪声声功率级的测定工程法
Acoustics--Determination of sound power levels of noise sources using sound intensity--Part 2: Measurement by scanning
GB/T16404.2-1999声学声强法测定噪声源的声功率级第2部分：扫描测量
Acoustics--Determination of sound power levels of noise sources--Requirements for the performance and calibration of reference sound source
GB/T4129-1995声学噪声源声功率级的测定--标准声源的性能要求与校准
Acoustics--Determination of sound power levels of noise sources--Precision methods and engineering methods for reverberation rooms
GB/T6881-1986声学噪声源声功率级的测定混响室精密法和工程法
Sound power level measurement of the Chinese traditional plucked three stringed instrument-Big Sanxian
中国传统弹弦乐器大三弦的声功率级测试
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
Limits of sound power level for noise emitted by air compressors (for power source use) and diaphragm compressors
GB7786-1987动力用空气压缩机和隔膜压缩机噪声声功率级限值
Method of sound power levels of noise emitted by household sewing machine head
GB/T14255-1993家用缝纫机机头噪声声功率级的测试方法
Determination of sound power level for noise emitted by displacement compressors--Survey method
GB/T7022-1986容积式压缩机噪声声功率级的测定简易法
Determination of sound power level for noise emitted by displacement compressors--Engineering method
GB/T4980-1985容积式压缩机噪声声功率级的测定--工程法
Determination of sound power levels of internal combustion engines noise--Engineering method and survey method
GB/T8194-1987内燃机噪声声功率级的测定工程法及简易法