Rigid clamping of the silencer also reduced the noise level.

約束阻尼層處理和冷卻風扇蓋硬化處理 ,可有效減小噪聲級達 3dB。

Introduced the noise classification and the mechanism of centrifugal fan in the rubber industry, and analyzed the conversion of centrifugal fan noise level.

介紹了橡膠工業(yè)用離心風機的噪聲分類及噪聲機理,分析了離心風機噪聲級的換算。

In view of the situation that the rise of noise level in the area protected by noise-barriers on many highways and urban roads in China, the authors think that the increasement of traffic, ratio acceleration of heavy trunks and over-loading vehicles, different kinds of apertures of noise-barriers are the main causes.

針對國內(nèi)不少公路及城市道路聲屏障保護區(qū)噪聲級明顯上升的狀況 ,提出了交通量增加、重型車和超載車比例增大 ,以及各種聲屏障的縫隙是影響降噪效果的主要原因 ,并對此進行了理論分析和探

Regulation on noise levels on board sea-going ships

GB5979-1986海洋船舶噪聲級規(guī)定

measured noise level [MNL]

量度所得的噪音聲級

Two-stage impulse noise filtering algorithm based on PCNN noise detection

基于PCNN噪聲檢測的兩級脈沖噪聲濾波算法

Determination of sound power level for noise emitted by woodworking machinery

GB/T3770-1983木工機床噪聲聲功率級的測定

Determination of sound power levels of noise emitted by household electrical appliances

GB/T4214-1984家用電器噪聲聲功率級的測定

Conclusion The workplace can be classified by equivalent consecutive sound level A.

結(jié)論噪聲作業(yè)可以用等效連續(xù)A聲級來進行分級。

Research on Multi-channel Adaptive Active Noise Control Systems for Reducing Vehicle Interior Low Frequency Noise;

車內(nèi)低頻噪聲多次級聲源有源消聲系統(tǒng)研究

Noise Pollution Levels of Urban Road Traffic in 2001

2001年度城市道路交通噪聲污染分級

Noise Pollution Levels of Urban Regional Noise Pollution

2001年度城市區(qū)域噪聲污染分級

Noise figures of cascaded two-port networks with unequal bandwidth

不等帶寬兩端口網(wǎng)絡級聯(lián)的噪聲系數(shù)

Acoustics--Determination of sound power levels of noise sources using sound pressure--Survey method using a reference sound source

GB/T16538-1996聲學聲壓法測定噪聲源聲功率級使用標準聲源簡易法

Acoustics--Determination of sound power levels of noise sources--Precision methods for anechoic and semi-anechoic rooms

GB/T6882-1986聲學噪聲源聲功率級的測定消聲室和半消聲室精密法

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

GB/T16769-1997金屬切削機床噪聲聲壓級測量方法

Determination of sound power levels of noise emitted by metal cutting machine tools

GB/T4215-1984金屬切削機床噪聲聲功率級的測定

Determination of sound power level for noise emitted by reciprocating pump--Engineering method

GB/T9069-1988往復泵噪聲聲功率級的測定工程法

Determination of sound power levels of internal combustion engines noise-Quasi-engineering method

GB/T1859-1989內(nèi)燃機噪聲聲功率級的測定準工程法

Determination of sound power level for noise emitted by centrifuger separator and filter - Engineering method

GB/T10894-1989分離機械噪聲聲功率級的測定工程法

Comparison of Equivalent Regional Environmental Noise Level in State-Controlled Cities in 2001

2001年度國控城市區(qū)域環(huán)境噪聲等效聲級比較