Meanwhile, a group of experimental data of additional noise pressure level and fluid pressure loss generated by flow in a duct is presented to explain the readability of us...
由于声激波降噪需要附加一段具有高速流动的缩放管道，它会附加流动噪声和压力损失，本文提供了这方面的一组实验数据，以说明应用声激波消声器的现实可能性。
The paper concludes that noise pressure level emitted from the headstock of a lathe is closely related to its idle running Empirical formula has been derived for calculating machine noise.
本文提出机床床头箱辐射的噪声声级与其空载功率有密切关系，并导出计算机床噪声的经验公式。
The sound pressure level changes acutely in shock intersection, and shocks outside nozzle and exhaust plume cause strong noise.
声压级在相交激波点附近出现剧烈变化，喷管出口处的激波和排气羽流造成强噪声。
The function of the optimum sound pressure level of the rolling bearing noise is established especially for applications to engineering.
为了在工程上应用，特别建立了最优滚动轴承噪声声压级函数。
Booster compressor noise has the characteristics of wide frequency band, intense low frequency sound and considerably high total sound pressure level.
增压机噪声具有频带宽、低频声强烈，且总声级又相当高的特性。
Protection of ear to reduce sound pressure on it is necessary if the ear is to be subjected to noise at a sound pressure level more than 85 decibels continuously.
如果耳朵要连续承受声压为85分贝以上的噪音，则必须加以保护，以减低它所承受的声压。
We get and analysis the data of the reverberation, noise and acoustic pressure level of the Conference Hall and Lecture Hall in some northern university in measurement.
实测和分析了北方某大学的甲报告厅和乙会议厅的混响时间、景噪声、场级等数据。
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。
The influence of fuel injection pressure on smoke emission value is comparatively complicated, while its influence on noise level is comparatively small.
气门间隙增大，碳烟排放量增大，但对噪声水平的影响则不是十分显著；
The change of the noise level of passenger car tires with different structure, size and tread pattern was investigated at different inflation pressure, load and speed.
讨论了不同结构、规格、花纹的轿车轮胎在不同气压、负荷、速度下的噪声声级变化。
The vibration is characterized by the virtual value of acceleration, and the noise is indicated by the sound-pressure-level.
振动用加速度有效值描述，噪声以声压级表示。
The vibration is characterized by the virtual value of acceleration, and the noise is indicated by the sound-pressure-level.
振动用加速度有效值描述，噪声以声压级表示。
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