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- 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。
- On the basis of this solution, this paper gives the sound pressure spectrum densities of broad band and harmonic sources, and then discusses the characteristics of these sound fields respectively in detail. 在此解基础上，本文得到宽频源和简谐源的近场声压谱密度，指出此2种声源近声场各自的特点及源的旋转半径和轴向位置对声场结构的影响。
- Measurement of sound pressure level for sound sign. 海船声号器具的声压级测量。
- pressure spectrum level 压谱级
- Usually, the problem is how to reduce the sound pressure level, either at source or on the transmission path. 通常噪声问题的解决办法就是在其声源处或是在其传播途中降低其声压水平。
- The spectrum level of microseismic noise tends to peak at about 1/6 Hz. 微震的噪声谱在1/6赫趋于峰值。
- The audible sound pressure range is from 0 dB to 120 dB. 听觉范围为0分贝到120分贝。
- The spectrum level of microseismic noise tends to peak at about 1/6 Hz . 微震的噪声谱在1／6赫趋于峰值。
- Ultra-low distortion at extreme sound pressure levels. 超低失真的极端声压级。
- Sound Pressure Level (SPL) Sound pressure level is a measurement of the pressure fluctuations of a sound wave as it propagates through the air. 声压级别声压级别是表示在空气中传播的声波的起伏压。
- Objective To study the change and significance of GFAP in thebrain of the mice exposed to infrasound of different sound pressure level . 目的研究不同声压级次声作用小鼠后脑中胶质纤维酸性蛋白(GFAP)的改变和意义。
- Conclusion The extent of GFAP change is closely related to the action times under infrasound of same sound pressure level. 结论马、皮质和下丘脑等区域对次声敏感，次声的作用效应与声压级和作用时间有关；
- This system can be used to calculate the aircraft take-off, approach and side-line noise( EPNL) for the purpose of aircraft noise certification, and to calculate the sound pressure and spectrum at airframe surface in cruise flying. 该软件除可预测飞机适航噪声审定的起飞、场和边线有效感觉噪声级外,还可计算巡航过程机体表面声压分布。
- The loudness in the hall is introduced and the investigated results are analyzed by the strength and LpF which is the mean sound pressure level of tutti-sound. 介绍了厅堂响度的评价指标,然后利用强度指数和厅堂乐队齐奏强音标志乐段的平均声压级LpF对现有的厅堂调研结果进行分析。
- INTRACRANIAL SOUND PRESSURE LEVELS DURING IMPULSSE NOISE EXPOSURE Saljo A. 在噪音刺激下颅内声音压力水平。
- A sound level meter measures sound pressure level.It has several frequency-weighted decibel (dB) scales (A, B, C) to cover different portions of the range of measured loudness. 声级表是用来测量声压级别的，它根据声音的频率分为几个分贝级（A, B, C）。
- In this paper, a cab is analyzed with SYSNOISE for the sound pressure level (SPL), structural mode participation factors and acoustic mode participation factors in the cavity. 在计算实例中，计算了由于汽车发动机振动引起的车内噪声的声压级、结构模态的振动参与因子和声学模态的参与因子，分析了引起车内噪声的主要原因。
- 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。
- spectrum level of underwater noise 水下噪声谱级
- There is a remarkably wide range of frequencies and sound pressure levels over which the human ear can detect. 人类耳朵对声音频率和声压级的感应范围很广。
