The influence of wind velocity on noise measurementofsoundlevel has been introduced and the permitted wind velocity has been determined.
介绍了风速对噪声声级测量的影响，确定了噪声测量的风速允许值。
2
According to error analysis ofsoundlevelmeasurement and practical case some objection was raised to levy standard on Noise Exceeding Environment standard.
依据声级测量的误差分析，结合实例，对国家现行《超标环境噪声排污费征收标准》提出异议。
3
With the measurementof average sound pressure level and sound power level, the noise reduction result of the oil pan made by sandwich steel plate was proved.