noise level sound level 中文意思是什麼

noise level sound level 解釋
噪聲值
  • noise : n 1 聲音，聲響。2 叫喊；嘈雜聲，噪音；喧鬧聲；吵鬧，騷動，騷擾。3 〈古語〉謠言，風聲。4 〈美國〉...
  • level : n 1 水平儀，水準儀；水準測量。2 水平線，水平面；水平狀態；平面，平地。3 水平，水準；水位；標準；...
  • sound : adj 1 健全的；強壯的，正常的；完好的，無疵的，沒有腐爛的（船、牙齒等）。2 正確的；正當的，合法的...
  1. An under estimation of the hearing effects by the low frequency noise could be happened. that is to say, even if the a - weight sound level is small, the low frequency noise may annoy to listener by the different ways from the high frequency noise. so it is necessary to understand psychoacoustics in order to make noise quality evaluations that match the subjective experience of the purchaser

    同時應用主觀評價方法?成對比較法（ paircomparisonstatisticalevaluationmethods ）對不同家用空調器噪聲進行主觀評價試驗，並與客觀評價結果進行了對比，結果表明：人主觀響應（煩躁程度）與各心理聲學評價指標之間均具有很高的相關性，相關系數一般均大於0 . 9 ，而與a計權聲壓級之間的相關系數只有0 . 78 。
  2. Electrically propelled road vehicles - airborne acoustical noise of vehicle during charging with on - board chargers - determination of sound power level

    電動道路車輛.車輛荷載運行期間產生的噪聲.聲級測定
  3. Its principle is as following : acquire and modulate the analog signals from sensors placed in environments through daq device on real time, then transit the information to computers by pci bus ; in the other hand, noise information tested with sound level meter is passed through interface rs - 232 to computers

    本系統工作原理為：通過多功能數據採集卡採集來自各種傳感器所採集的各檢測對象的模擬信號，對信號進行調理，通過pci系統總線傳遞給計算機；而噪聲則通過聲級計由rs - 232傳入計算機。
  4. 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。
  5. Noise level measurement in sound systems

    音響系統中的噪聲級測量
  6. ( 4 ) establish the grey model on the basis of the actual sound pressure level of 27000dwt bulk carrier superstructure cabin as a sample and extend the grey model through comparing the prediction values with the actual values, aiming to predict the noise level of superstructure cabin of 74500dwt bulk carrier and 5618teu container ship

    （ 4 ）以27000噸散裝貨船上層建築艙室噪聲的實際測量值為樣本，建立灰色預測模型，通過預測值和實測值的對比分析對模型進行推廣，並分別對74500噸散裝貨船和5618箱集裝箱船的上層建築艙室噪聲進行預測。
  7. However, even under this regulated value, you may be requested to further reduce the sound volume to proper level, to produce environments easy for visitors to listen to the explanation, in case there is any complaint from other exhibitors, etc. in the vicinity or in case the noise level in the entire fair site became high

    但是，即使在此音量規定值以下，如果附近參展方等提出意見或者會場整體的噪音程度過高的話，則不受此限制，為了創造一個入場者容易聽清講解的環境，盡管在規定范圍內也請降低並控制在適當的音量范圍。
  8. In this paper the train running noise level has been predicted with the theory of point sound source. the sound exposure level of a train set pass, equivalent continuous sound level and maximum sound level of a train set pass has been taken as estimate values, and some kinds of affixation attenuation on the course of noise propagation is considered, then the corresponding visual software has been developed. these make it convenient and precise to predict the noise level

    本文從點聲源的理論出發，對列車運行噪聲進行預測計算，採用一列車通過時的單發暴露聲級、時間特性的最大聲壓級和一定時間內的等效聲級等作為噪聲評價量，並考慮了噪聲傳播過程中的各種附加衰減，編制了相應的可視化軟體，使噪聲預測計算方便、準確。
  9. We did some analysis about the relativity between the vibration and the noise of the wheel. after the testing of the first line of guangzhou underground, we found that the existing wheel damper has nothing to do with the noise of wheel less than four thousands hz. compared of different contributions of the tread vibration and the web vibration on sound level of railway noise

    在實驗過程中，改進了對車輪的激振方式，利用單擺激振提高了激振力的精度;實驗分析了車輪阻尼器的結構、安裝方式及其動力學參數對車輪阻尼器降噪效果的影響;也分析了車輪振動與噪聲的相關性;現場測試廣州地鐵一號線的噪聲特性，確定了車輪阻尼器所要控制的頻率范圍;對比分析不同激振情況下，踏面徑向振動與輻板軸向振動對噪聲聲壓級的貢獻比例。
  10. Then analytical measurements of the noise were carried out on both of the turbines by means of modern acoustic apparatus and a conclusion has been found that the noise of the concentrated wind energy turbine is lower than the one of the ordinary wind energy turbine and the root of the trouble to cause noise chiefly originates from the turbine blade. besides, the result of analytical measurement also reveals that the power output both of the wind energy turbines will increase with the increase of the wind speed and unfortunately does the noise too. in order to lower the noise, a measures of noise reduction have been advanced that an active method is to develop a wind energy turbine run at a lower rating of wind speed while the passive method is to adopt a board drilled tiny holes, having established a sound technological basis for the development of a kind of wind energy turbine of low noise and high level in the world

    主要對濃縮風能型風力發電機在正常運轉時，噪聲產生的機理進行了理論分析研究，並與普通型風力發電機的噪聲進行了對比實驗分析；利用現代聲學測試手段對兩類機型進行測試與分析，得出濃縮風能型風力發電機產生噪聲低於普通型風力發電機和葉輪是風力發電機產生噪聲的主要部件的結論；通過對兩類機型的噪聲、輸出功率的測試，得出隨著風速的增加，兩類風力發電機的輸出功率在增加，產生的噪聲也在增加的結論；提出了進一步降低濃縮風能型風力發電機噪聲的措施，從主動降噪方面，研製低額定轉速的發電機；從被動降噪方面，採用微孔穿板的降噪結構；為研究開發一種國際上低噪聲、高水平的風力發電機打下了良好的技術基礎。
  11. 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
  12. The sound quality of the appliance has become a significant component in the purchaser ' s overall subjective evaluation. the sound of the appliance used to be evaluated by the noise level measured in db ( a ). however, in some cases, the noise level measured in db ( a ) ca n ' t match the feeling of people

    根據有關國家標準，家用電器的噪聲通常採用a計權進行測量，但在某些情況下應用a計權測量的結果有可能不夠確切：在一些情況下，某些產品a聲級並不高，用戶卻抱怨噪聲太吵；而在另一些情況下，盡管其a聲級比較高，但用戶卻可以接受。
  13. Analyzing the sound characteristics of each part in frequency domain, it will be a guidance to the resolution in attenuating the engine ' s noise level

    經與九點聲壓法測量得到的整機噪聲結果對比，表明表面振動法識別柴油機噪聲源是準確可靠的。
  14. Optional ; prefiltering panel and sound reducing case - noise level is cut down to 67db

    可選配預過濾面板和降噪箱，噪音可降低到67db a
  15. Abstract selecting certain section of north - south elevated road in shanghai to develop and set up several curved and erect, turnable noisae - preventing screens, and making comparative noise level test and then conducting analysis and approach on sound environment werw presented in this article

    摘要在上海市區南北高架與地面道路建設期間，選擇了一些典型的高架路段，開發和設置了弧型與面立型兩種可翻轉式防噪聲屏，並作了對比噪聲測試，進行了聲環境的分析、探討。
  16. The exhaust noise is the most common sound source of engine noises, and is usually 10 to 15db higher than the overall noise level of the engine

    排氣噪聲是發動機噪聲中最主要的聲源，其噪聲一般要比發動機整機噪聲高出10 ~ 15db （ a ） 。
  17. 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。
  18. 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

    針對不同環境下的噪聲國際上提出了很多評價方法，目前為世界上廣泛應用的是以a聲級作為基本評價量的評價方法。
  19. For continuous monitoring of noise, sound level monitors are installed on site for round - the - clock measurement

    為了不斷監察噪音水平，數碼港地盤內會裝設音量監測器，廿四小時進行測量。
  20. Determination of sound level for noise emitted by displacement compressors

    容積式壓縮機噪聲的測定
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