在混响室内测试了轿车轮胎的噪声声级。
The noise level of passenger car tire was measured in a reverberation laboratory.
的便携式声级计和校准声源声测量系统。
Portable sound source for calibration of sound level meters and sound measuring system.
研究了影响三通道喷嘴噪声声级的相关因素。
Some factors that affect the sound level of the noise emitted from a three-channels nozzle were investigated.
结果该区域背景噪声值较高，但其等效声级达标。
Results The equivalent sound levels (LAeq) were qualified in spite of higher background value of noise in this areas.
电动葫芦试验台、声级计、漆膜测厚仪、经纬仪、水准仪；
Electric hoist test platform, sound-level meter, varnish film thickness gauge, altazimuth, level;
目的比较个体计量仪与声级计评价挡车工噪声暴露的异同。
Objective To compare the virtues and disadvantages between the measure results using individual dosimeter and sound level meter respectively.
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。
Booster compressor noise has the characteristics of wide frequency band, intense low frequency sound and considerably high total sound pressure level.
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。
The influence of wind velocity on noise measurement of sound level has been introduced and the permitted wind velocity has been determined.
根据大量的测试结果分析了燃烧室噪声的规律和总声级的预测模型。
The regularities of the combustion chamber noises are analysed based on the numerous measurements obtained, and the predicted models of the total sound pressure level are also given.
人们对噪音的感觉不但取决于声级的大小，而且还与噪音的频率有关。
Peoples sense on noise lies not only on the sound level but also on the frequencies of sound wave.
结论平均等效声级可以作为评价和比较工业企业的噪声危害程度的综合指标。
Conclusion the average equivalent sound level maybe as comprehensive index to evaluate the noise hazard in industrial enterprises.
该装置由工控机、精密声级计、数据采集卡以及相应的采集和分析软件构成。
The instrument is formed by IPC, exact sound level metre, data sampling card and software for sampling and analysis.
道路沿线建筑、绿化、坡降、路面宽窄、交通管理等对等效声级也有很大影响。
All have shown that build and afforestation along traffic main, slope, road width, traffic management and so on have great effect.
本发明提供一种能降低定子温度的上升和电磁噪音声级等的车辆用交流发电机。
The invention discloses AC generator for vehicle use capable of reducing temperature rising and grade of electromagnetic noise.
健康专家们表示许多人由于环境中噪声级数的增加而使听力受到了永久性的伤害。
The health experts say many persons develop permanent hearing damage because of increasing levels of noise in the environment.
因此，发达国家对其辐射噪声级进行了严格的限制，以期尽可能降低对人的危害。
Therefore, in order to minimize the hazards to human, their radiation noise level has been restricted strictly by developed countries.
介绍了橡胶工业用离心风机的噪声分类及噪声机理，分析了离心风机噪声级的换算。
Introduced the noise classification and the mechanism of centrifugal fan in the rubber industry, and analyzed the conversion of centrifugal fan noise level.
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 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.
最后讲述如何在设计和管理上控制列车的辐射声级，使之满足铁路边界噪声限值的要求。
Finally, the paper gives its view on how to control the radiant noise level through design and management in order to satisfy the requirements on railway boundary noise limit.
结果表明，在测量精度不变的前提下，新测量系统在测量和数据处理方面明显优于原声级计。
Compared with the original sound level meter, the new measuring system has the same accuracy and was much convenient in signal measuring and data processing.
烟尘控制区逐年扩大，市区区域环境噪声等效声级56.6分贝，达到国家规定的控制目标。
Smoke and dust control area is extending year by year, and noise in urban area is controlled below 56.6 DB, meeting the national 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。
According to error analysis of sound level measurement and practical case some objection was raised to levy standard on Noise Exceeding Environment standard.
该文通过实验研究了不同频率、不同噪声级和不同暴露条件下的噪声对人体的心率变异的影响。
The experimental results indicated that the effects of the noise frequencies and exposed conditions on HRV during R-R interval period were significant .
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 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.
一种充气轮胎，其包括具有锐角部的陆部，不仅能维持耐单边磨损性能，还能降低气柱共鸣声声级。
A pneumatic tire having land sections with acute Angle sections, in which the level of air column tube resonance sound is reduced with uneven wear resistance maintained at high level.
通过实验拟合提出了等效虚源法，该新方法可简便准确地预测体声源和面声源在不同距离的影响声级；
The new method can simply forcast noise level affected by volume source or area source at different distances.
声级计以其简单，方便，成本低，精度高等一系列优点，成为航空器噪音测量方面主要的测量仪器之一。
Sound-level meter by its simple, convenient, the cost is low, the precision higher a series of merits, become one of aircraft noise measurement aspect main metering equipment.
噪声总声级的变化较为复杂，由泡空化状态转换到片空化状态，空化数虽然减小，但总声级会突然降低。
The total noise changes complexly. When the bubble cavitation turns on the sheet cavitation, the total noise will reduce suddenly although the cavitation number becomes smaller.
噪声总声级的变化较为复杂，由泡空化状态转换到片空化状态，空化数虽然减小，但总声级会突然降低。
The total noise changes complexly. When the bubble cavitation turns on the sheet cavitation, the total noise will reduce suddenly although the cavitation number becomes smaller.
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