噪声级

在声源识别的指导下，对轿车的设计进行了改进，使车内噪声级下降了5.5dB（A）。

According to the results of identification , the car design was modified , and the noise level was decreased by 5.5dB ( A ) .

大型纺织企业在纺织分厂，纺纱分厂内安装大量的先进纺织机和纺纱机，车间内的平均噪声级达93-98dB（A）。

The large-scale textile enterprise installs advanced textile and spinning machines in the branch factories , and the average noise level reaches 93-98dB ( A ) in the workshops .

按照ISO新标准提出了铲土运输机械野外使用时和作业时噪声级及声源频率的测量技术。

According to new criteria of ISO , measuring Technic of noise degree and frequeucy during working outside of earth-moving machinery is given .

从分析处理所获得的数据得到了一些有意义的结果，它证明了计权等效连续感觉噪声级（WECPNL）不但在物理上，而且在心理上都是对机场周围飞机噪声有效的评价方法。

These results indicate that WECPNL is an effective measure of aircraft noise not only in physical but also in psychological evaluation .

本研究结果在不涉及电机的本体结构，不影响电机性能参数的前提下，所采取的降噪措施可使电机的平均噪声级降低10dB（A）以上，达到国外同类电机噪声指标的先进水平。

The presented work reduces the average noise level of those motors by 10dB ( A ), without changing its structure and influencing its performance . The results reached the advanced level of the same series in abroad .

轴流式风机导轮对噪声级的影响

The diffuser of axial & flow air pump influences its own noise

高速客船舱室噪声级预估方法的检验

Inspection for the Prediction of the Cabin Noise-Level onboard High Speed Passenger Vessel

估算车辆鸣号引起噪声级增量的一种简便方法

A simple and convenient method for measuring and estimating horn-generated traffic noise level increment

GB5979-1986海洋船舶噪声级规定

Regulation on noise levels on board sea-going ships

道路声屏障保护区噪声级上升原因的探讨

Discussion on Causes for Rise of Noise Level in Area Protected by Road Noise-barrier

导轮使声波频率复杂化，使噪声级增大。

The diffuser makes the ( audio ) frequency complicated and the noise increased .

至于系统的噪声级如何，就不再加以讨论。

As for the noise degree of the system , it is not discussed .

在半消声室内测试了对角修形齿轮和不修形齿轮的噪声级。

In a half-anechoic room , the noise levels of diagonal modified gears and unmodified gears are measured .

我国目前纺织厂织造车间的噪声级均较高。

There is a higher noise level in the weaving workshops of textile factories in China at the present time .

至今为止所发表的所有有关船舶振动的衡准、基准或指南等等，都是与船上的噪声级没有关系的。

All criteria about ship vibration which have been published till now , are independent of noise level on board ships .

根据声强迭加原理，从理论上推导出该模型车队流产生的噪声级以及评价，并分析了各种变化因素与车队流噪声的关系。

It is necessary to research the pattern of vehicle noise , but theoretical analyses about vehicle noise on ruch hours were never reported before .

我们对不同噪声级（40至70dBA）下学生课堂行为作了一系列的心理学实验，和汉语清晰度测验。

A series of psychological tests were conducted to identify pupils ' behavior in a classroom under different noise levels within the range of 40 to 70 dBA .

随着船舶动力装置向高功率密度方向发展，船舶的噪声级越来越高，简单的振动噪声处理已难以满足其噪声和振动限值的要求。

The simple methods of the vibration and noise control could hardly meet the limitation demands owing to the higher power density of the marine power plant and the high noise level .

通过经验公式得出舰船的辐射噪声级并进行统计分析，得出舰船辐射噪声的概率分布直方图，由此可以导出被动声纳作用距离的概率分布直方图。

By experience formula to calculate ship 's radiate noise , and make statistics analyze , it derives its probability distributing histogram , and then , a passivity sonar detecting range probability distributes histogram .

若实测的噪声级超过灾设备噪声数据表中指定的噪声级，供应商应根据保证做成所有必需的更改、修理或替换。

If the actual noise levels as measured exceed those specified on the equipment noise data sheet , supplier shall make all necessary alterations , repairs , or replacements in accordance with the guarantee .

应用声传导的质量效应，选用表面质量大的材料作屏蔽，都能使屏蔽区的噪声级有明显降低。

Or apply the mass effect law of sound transmission loss and select the barrier material of high surface density all will have a significant reduction of the sound pressure level in the shielding area .

将源强相近的车型归类合并后，得到了小、中、大三类车型的单车交通噪声级与车速的关系式，并与现行公路环评规范推荐的单车交通噪声源强作了比较。

After combining the vehicle types which possess the similar traffic noise levels , relationships between traffic noise levels of single vehicle and its velocities were obtained for the three types of vehicles & small , medium and large .

选用合适的吸声吊顶材料和结构，能获得明显的降噪效果，能使车间噪声级降低3&5分贝（A），并且造价并不太高。

By using suitable sound-absorption material and structure , we can get an evident effect on noise reduction . 3-5 db ( A ) of noise level in a loom workshop can be reduced by using sound-absorption ceilings with a cost being not high .

总结出主要影响因素有车流量、车速、车型比例、单辆汽车辐射噪声级、路面材质、道路宽度、绿化隔离带等。

The main impact factors were flux , speed , the type ratio of motor vehicle , single vehicle radiation noise , pavement material , road width , green belt , and so on . Finally , some suggestions were put forward to improve the traffic noise of Harbin .

基于谐波控制理论的滚动轴承噪声声压级函数

Sound-Pressure-Level Function of Rolling Bearing Noise Based on Harmonic Control Theory

燃烧噪声一级影响模型的多元回归分析

Multi-Regression Analysis of the First-Level Influence Model of Combustion Noise

GB/T16769-1997金属切削机床噪声声压级测量方法

Metal-cutting machine tools & Measurement method of sound pressure level

放空噪声声压级随着氧气压力、排放流量的增大而按对数关系提高。

Its strength was increased with oxygen pressure and outlet flowrate in logarithm relation .

冲裁加工最大噪声声压级预测模型

Simple model for predicting Blanking noise

GB/T16539-1996声学振速法测定噪声功率级用于封闭机器的测量

Acoustics Determination of sound power levels of noise sources using vibration velocity Measurement for seal machinery