Rigid clamping of the silencer also reduced the noise level.

約束阻尼層處理和冷卻風(fēng)扇蓋硬化處理 ,可有效減小噪聲級(jí)達(dá) 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(fēng)機(jī)的噪聲分類及噪聲機(jī)理,分析了離心風(fēng)機(jī)噪聲級(jí)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(duì)國(guó)內(nèi)不少公路及城市道路聲屏障保護(hù)區(qū)噪聲級(jí)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(duì)此進(jìn)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(jí)規(guī)定

measured noise level [MNL]

量度所得的噪音聲級(jí)

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

基于PCNN噪聲檢測(cè)的兩級(jí)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(jī)床噪聲聲功率級(jí)的測(cè)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(jí)的測(cè)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(jí)來(lái)進(jìn)行分級(jí)。

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(jí)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(jí)

Noise Pollution Levels of Urban Regional Noise Pollution

2001年度城市區(qū)域噪聲污染分級(jí)

Noise figures of cascaded two-port networks with unequal bandwidth

不等帶寬兩端口網(wǎng)絡(luò)級(jí)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(xué)聲壓法測(cè)定噪聲源聲功率級(jí)使用標(biāo)準(zhǔn)聲源簡(jiǎn)易法

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

GB/T6882-1986聲學(xué)噪聲源聲功率級(jí)的測(cè)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(jī)床噪聲聲壓級(jí)測(cè)量方法

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

GB/T4215-1984金屬切削機(jī)床噪聲聲功率級(jí)的測(cè)定

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

GB/T9069-1988往復(fù)泵噪聲聲功率級(jí)的測(cè)定工程法

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

GB/T1859-1989內(nèi)燃機(jī)噪聲聲功率級(jí)的測(cè)定準(zhǔn)工程法

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

GB/T10894-1989分離機(jī)械噪聲聲功率級(jí)的測(cè)定工程法

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

2001年度國(guó)控城市區(qū)域環(huán)境噪聲等效聲級(jí)比較