Some factors that affect the sound level of the noise emitted from a three-channels nozzle were investigated.
研究了影响三通道喷嘴噪声声级的相关因素。
The instrument is formed by IPC, exact sound level metre, data sampling card and software for sampling and analysis.
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 influence of wind velocity on noise measurement of sound level 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。
With integration of DDS and computer technology, the tone burst instrument is well designed to meet the new testing standard of the sound level meter.
将DDS技术与单片机以及计算机技术结合，运用到猝发声仪器的设计中，实现了符合新的声级计检测标准的猝发声仪器的开发。
All kinds of methods measuring noise have been produced and A-weighting sound level is extensively used as a kind of fundamental measure in all of the world.
针对不同环境下的噪声国际上提出了很多评价方法，目前为世界上广泛应用的是以A声级作为基本评价量的评价方法。
According to error analysis of sound level measurement 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。
It presents recommended levels and frequency characteristics for the inductive field at the telephone earphone relative to a sound level presented at the same earphone.
该条给出了电话耳机处相对于该耳机发出的声压级的，所建议的感应场的强度级和频率特性。
The a sound level on influencing humans' hearing sense normally adopt as an index in current noise assessment standards, though psychological and mental influence is neglected.
现有噪声标准一般采用基于对人听觉影响的A声级作为评价量指标，而忽视了噪声对人的心理和精神方面的影响。
Aiming at the traffic noise problem of Lhasa, the author USES artificial neural network theory and method to predict the equivalent consecutive sound level of traffic noise in Lhasa.
针对拉萨市道路交通噪声污染问题，运用人工神经网络理论和方法对拉萨市道路交通噪声的等效连续声级进行预测。
This simulator has several advantages, e. g. low frequency, high power, and its transmitting sound level is adjustable, which could meet the engineering demands of kinds of open sea tests.
模拟器具有低频、大功率等优点，并且发射声源级可调，可满足多种海上试验的工程需要。
Electric hoist test platform, sound-level meter, varnish film thickness gauge, altazimuth, level;
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;
电动葫芦试验台、声级计、漆膜测厚仪、经纬仪、水准仪；
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