降低噪聲級 的英文怎麼說

中文拼音 [jiàngdīzàoshēngjí]
降低噪聲級 英文
noise reduction rating
  • 降 : 降動詞1. （投降） surrender; capitulate 2. （降伏） subdue; vanquish; tame
  • 噪 : 動詞1. （蟲或鳥叫） chirp 2. （大聲叫嚷） make noise; make an uproar; clamour
  • 級 : Ⅰ名詞1 （等級） level; rank; grade 2 （年級） any of the yearly divisions of a school course; gra...
  • 降低 : reduce; cut down; abate; debase; drop; lower; lessening; reducing; reduction; depression; tarnish
  1. 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。
  2. This series motors are widely used in various mechanical equipment which needs stepped speed adjustment, so that they enable the equipment to have compact structure, lower noise and ability to save energy

    本系列電動廣泛用於各類需要有級調速的機械設備，能使整機結構緊湊、噪聲降低、能量節約。
  3. 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 。
  4. 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。
  5. Using sige bicmos darlington configuration as the input stage, the input resistance is increased by the mos devices while the transconductance of sige hbts is maintained. in the same time, the equivalent input noise is controlled well because of the sige hbts ’ good noise performance in the input stage

    輸入級的設計採用sigebicmos達林頓結構，在保留sigehbt高跨導優勢的基礎上充分利用mos器件來提升運放輸入電阻，此外，基於輸入級中sigehbt良好的噪聲特性，運放的輸入參考噪聲電壓可以大大降低。
  6. Moreover, an optimized lna structure - inter - stage inductor matching - is presented, which can achieve conjugate match of two stages, maximize the forward transmission, sequentially increase the signal noise ratio ( snr ) and reduce the noise figure

    並提出了級間匹配電感的設計方案，此優化結構能實現兩級之間的共軛匹配，使信號的正向傳輸最大化，從而增大信噪比，降低了噪聲。
  7. Through redesigning of pipe system to alter its character and using the ways to isolate vibration and reduce vibration, it is yielded very good results of reducing the vibration and noise. in some points the acoustic pressure level drops very much, such as in the standard point of number one pump the acoustic pressure level drops 15db ( a ) and in the standard point of cistern also drops 15db ( a ), and in the highest point of the acoustic pressure before redesign drops from 105db ( a ) to 44db ( a ), and in the second floor the acoustic pressure level have reached the requirment

    通過對管道結構的改造，減振和隔振措施的有效使用，使供水系統的振動和噪聲得到了有效的控制：使一號泵前的標準點和蓄水池前標準點的噪聲聲壓級都降低了15db （ a ） ，管道上測點的振動量降低了90 ；二樓居民門外的噪聲從55db （ a ）降到25db （ a ） ，遠低國家標準35db （ a ） ；在改造前噪聲最大點西側蓄水池的噪聲也由105db （ a ）降到44db （ a ） 。
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