噪音聲級 的英文怎麼說
中文拼音 [zàoyīnshēngjí]
噪音聲級
英文
noise level-
Product : tachometer 、 stroboscope 、 surface speed mter 、 anemometer 、 sound level meter 、 moisture meter 、 grain moisture meter 、 thickness meter 、 coating thickness meter 、 humidity meter 、 dew point meter 、 temp. meter 、 lux meter ect
主要產品：主要產品：轉速表、風速表、聲級計、 （噪音計） 、水份儀（水分儀） 、溫濕表、露點儀、測厚儀、塗層測厚儀、溫度表、照度表、頻閃轉表等。A large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning
應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客機進場著陸過程中的機體噪聲源進行了實驗測量，本文對七架窄體客機和七架寬體客機的起落架噪聲進行了分析，得到了起落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起落架噪聲的頻譜是由寬頻隨機噪聲與一些較為明顯的單音噪聲源組成，起落架噪聲的指向性類似於一個水平放置的偶極子.不同飛機起落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起落架噪聲。Noise level measurement in sound systems
音響系統中的噪聲級測量We got a new model centrifugal fan by the mathematics optimum design, experiment optimum design, lots of mathematics calculation and regress calculation in the paper. the efficiency of this new fan is increased 6. 44 % and the noise is reduced 4. 78db than that of the original fan
本文通過數學優化和試驗優化相結合的方法，並對實例經過大量的數學計算、試驗及回歸計算等得到了一種新型離心式通風機，該通風機比它的原型機（ 4 - 72no . 4a ）效率提高了6 . 44 ，比a聲級噪音降低了4 . 78db 。Testing of acoustics in buildings ; airborne impact and sound insulation ; measurement of level difference
建築物聲學檢驗.氣載噪聲和隔音.第6部分:噪聲級差測The predicted noise level is at least 1 db more than the prevailing traffic noise level at the time before the works to construct the road were commenced
預測中的新建道路噪音水平必須最少比該區在建路工程進行之前的交通噪音聲級高1分貝a 。Abstract : a large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning
文摘:應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客機進場著陸過程中的機體噪聲源進行了實驗測量，本文對七架窄體客機和七架寬體客機的起落架噪聲進行了分析，得到了起落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起落架噪聲的頻譜是由寬頻隨機噪聲與一些較為明顯的單音噪聲源組成，起落架噪聲的指向性類似於一個水平放置的偶極子.不同飛機起落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起落架噪聲。The second level mitigation activities is the use of permanent or movable noise barriers of 3. 5 to 4 metres high in addition to the use of quiet equipment
第二級緩解措施是除了使用低噪音設備外，還採用3 . 5至4米高的固定或流動隔聲屏障。Specification for sound level meters for the measurement of noise emitted by motor vehicles
機動車噪音測量用聲級計規范The epd will, in practice, respond to complaints lodged by members of the public and compliance with the acceptable noise levels will be required only after a noise abatement notice has been served
環保署一般?會在接市民投訴時並於查明確鑿下，方會發出消減噪音通知書，繼而令有關人士遵守該項可接受的噪音聲級的規定。Acoustics - requirements relative to noise level limiting devices intended for use in premises where amplified music is produced
聲學.音樂放大製作中心用相關噪聲級限制設備的要求Acoustics - determination of sound power levels of noise sources using sound pressure - survey method using an enveloping measurement surface over a reflecting plane iso 3746 : 1995 ; german version en iso 3746 : 1995
聲學.聲壓法測定噪音源聲功率級.包絡面簡易測量法Acoustics. determination of sound power levels of noise from air - terminal devices, air - terminal units, dampers and valves by measurement in ? reverberation room
聲學.混響室空調終端設備空調終端部件氣流調節器和閥門的噪音聲功率級測定At the same time this paper calculates the effect of train velocity on noise propagation, when mach number is 0. 1, sound velocity less effects on noise level ; when mach number is 0. 4, the difference value is about 2db whether to consider the sound velocity. so when the train velocity is not very high, the effect of sound velocity may not be considered
本文同時計算了列車運行速度對噪聲傳播的影響，當馬赫數為0 . 1時，聲音的傳播速度對聲級的影響是很小的，當馬赫數為0 . 4時，考慮聲速與不考慮聲速影響的最大值的差值大約為2db左右，因此在列車速度不是很高的情況下可以不考慮聲速的影響。It should be noted that there is no requirement for industry in general to achieve the acceptable noise levels immediately, but to bring the noise level to or below the anl by the date specified on the noise abatement notice
條例並無規定各行業必須即時把噪音水平減至可接受的噪音聲級，但必須于消減噪音通知書訂明的日期前，將噪音水平減至可接受的噪音聲級或更低水平。Maximum allowable noise level
最高允許噪音聲級The contribution to the increase in the overall noise level from the new road must be at least 1 db
新建道路噪音導致整體噪音聲級的升幅最少需達1分貝a 。The predicted overall noise level from the new road together with other traffic noise in the vicinity must be above
新建道路加上附近其他道路的交通噪音的預測整體噪音聲級，必須達Does not comply with objective technical criteria in the form of acceptable noise levels as set out in the technical memorandum for the assessment of noise from places other than domestic premises, public places or construction sites
不符合管制非住用處所非公眾地方或非建築地盤噪音技術備忘錄訂明的可接受的噪音聲級技術準則The nature of the noise sources covered by these provisions in sections 4 and 5 of the ordinance is such that it is not possible to specify fixed acceptable noise levels or noise measurement procedures to be used in assessing the acceptability of the noise
條例第4及5條所管制的噪音來源，因有其特性，故不適宜用具體確定的可接受噪音聲級或量度程序來評估其程度。分享友人