The fluidization behavior of 5-10 nm SiO2 and Fe3O4 particle mixtures was investigated in a fluidized bed of 56 mm diameter under different sound pressure levels and sound frequencies.
053 mm)为客体颗粒,在声压级为90~105 dB时系统考察了声场频率、声场强度和主客体颗粒不同配比关系对超细颗粒流化行为和聚团尺寸的影响。
Through the spot measurement of the pump and downstream pipeline noise,and analyzing the spectrum analysis curve of sound pressure level and sound intensity level,this paper offers basis for the fundamental reason study of high vibration and noise,and puts forward t.
通过对泵及下游管线噪声进行现场测量,以及对各测点声压级谱分析曲线和声强级谱分析曲线的分析,为研究其振动和噪声高的根本原因、提出合适的改造方案提供依据。
In″Panel Experiment″,two diagrams of sound pressure level vs.
本文以网络共聚物(蓖麻油/TDI+HEMA)为阻尼材料,对自由阻尼板作了噪声频谱分析,观察到在约千周以上频区,声压级较裸钢板有明显降低,对覆盖阻尼材料的钢条样品的内耗变频测量表明,内耗随频率而增加,说明自由阻尼板声压级的降低是由自身内耗随频率增大所引起。
The effect of the bubbles in aeration flow on the Sound Pressure Level(SPL) difference and the cavitation noise intensity in pressure relief model is investigated based on the acoustical characteristics of the bubbles.
根据气泡的声学特性,对掺气水流中气泡可能对减压实验中声压级差和空化噪声强度测量结果造成的影响作了初步的理论探讨。
Combining with the national and foreign related standards, the selection of SPL(Sound Pressure Level) of sound reinforcement system is discussed in terms of technique and implement.
从技术和实际应用角度,结合国内外相关标准,对扩声系统声压级的设置进行了论述。
Followingly, an interfacial acoustic pressure level at a certain point on the vibrating plate is found with this equation.
以脉动半球声源和固定圆板的一阶振型假设为基本物理模型，导出了不同频率下的振 声转换公式，由此求出振动板上某一点处的界面声压级。
The results show that the lateral acoustic pressure level is larger than the upside and the foreside of the wh.
结果表明,在1~3000 Hz的频率范围内,车轮外侧声压级大于车轮上部和前部的声压级,域点声压级随频率增加而增大。
A-weighted equivalent continuous sound pressure leve
Ａ加权等效连续声压级
Measurement of sound pressure level for sound signal appliances by seagoing vessel
GB/T12303-1990海船声号器具的声压级测量
Acoustical Violence-Issues about the Sound Pressure Level of National Centre for the Performing Arts
声暴力——续谈“国家大剧院扩声声压级的讨论”
Metal-cutting machine tools--Measurement method of sound pressure level
GB/T16769-1997金属切削机床噪声声压级测量方法
Acoustics--Reference equivalent threshold sound pressure levels for pure tones and insert earphones
GB/T16402-1996声学插入式耳机纯音基准等效阈声压级
Noise Level Prediction of Gear Transmission System due to Vibration and Sound Signals
基于振动噪声信号的齿轮传动系统声压级预测
Effects of infrasound with low sound pressure level on rats with cerebral ischemia-reperfusion injury
低声压级次声对大鼠脑缺血再灌注损伤的影响
Studies implemented clear sound signals propagation by Loudspeaker System at high SPL and long distance
实现扬声器系统高声压级与远距离清晰传声的应用探讨
Discussion of the Maximum Sound Level for Performance in The National Centre for the Porforming Arts;
国家大剧院演出最大声压级限制的讨论
Uncertainty in Measurement on Sound Pressure Level of Horn for Motor Vehicle
机动车用喇叭声压级测量不确定度分析
Effects of low decibel infrasound on heart function after acute myocardial infarction in rats
低声压级水平次声对心肌梗死大鼠心功能的影响及机制
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。
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
Determination of transformer and reactor sound levels
GB/T7328-1987变压器和电抗器的声级测定
Aerodynamic Performance Research on Transonic Hige Pressure Stage of Air-Cooled Turbine
跨声速高压气冷涡轮级气动性能研究
Novel primary series matching scheme for piezoelectric ultrasonic transducer
压电超声换能器初级串联匹配新方法
Dipole Source Identification in Last Stage of Propylene Compressor
丙烯压缩机末级偶极子气动声源识别
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
