low frequency noise 中文意思是什麼

low frequency noise 解釋
低頻噪音
  • low : adj 1 低的；淺的，矮的。 low flight 低飛。 a low temperature 低溫。 low tide [water] 低潮。 The g...
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • 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〉...
  1. Surface transverse wave has the 1. 6 high frequency than rayleigh type surface acoustic wave ( using the same technology the frequency of devices of stw has about 1. 6 high frequency than rayleigh type surface acoustic wave ). the paper introduces the theory, design parament, technology and result expeiment of surface acoustic wave ( includes rayleigh surface acoustic wave and surface transverse wave, simple stw ) with low insertion loss, high q and researches the high frequency, low phase noise oscillator with 1ghz stw resonator as frequency element. and describes measurement method and finally experimantal result of the low phase noise surface acoustic wave oscillator

    本文研究了以低損耗、高q值聲表面波（其中包括聲表面瑞利波- - rayleighsurfaceacousticwave ，和聲表面橫波等）諧振器的工作原理、設計參數、製作工藝及其實驗結果，並且研究了以1ghzstw諧振器為頻控元件的高頻率、低相位噪聲聲表面波振蕩器，以及低相位噪聲聲表面波振蕩器的測試方法和最終的測試結果。
  2. 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 。
  3. Some people living near wind farms complain they are kept awake by a phenomenon known as aerodynamic modulation ( am ), low frequency noise made as the blades swoosh through the night air

    有些住在風力發電廠附近的人抱怨，他們因為一種稱為空氣動力調變的現象，即輪葉的颼颼聲劃過夜空，產生低頻噪音，以致無法入眠。
  4. While simulating the resonant circuits, we finished a microstrip resonance, which has high q - factor and fits to design w - band low phase noise oscillators. select beam lead hyperabrupt junction varactor and gunn die made in china as vco ’ s frequency turning component and minus resistance

    此外，文中還對w頻段微帶結構直流偏置網路、微帶波導過渡等外圍電路進行了模擬優化，設計方法和結論對毫米波微帶電路設計具有通用的參考價值。
  5. The planet vibrates at a very low frequency ? too low for our ears to pick up, but enough that geologists get an annoying background noise on their sensitive instruments

    行星振動的頻率很低，我們耳朵很難分辨出，但在地理學家靈敏的儀器上卻會收到一個非常令人討厭的背景噪音。
  6. This paper studies the mechanism generated from flow - noise in seawater pipeline, introduces controlling method of flow - noise, analyzes sound field characteristics of flow - noise in seawater pipeline system and the merits and demerits of measuring the flow - noise methods in and out of the pipeline. in our experiment, a test measuring device of seawater muffler is used in a measuring chamberlet to verify that a method of reverberation chamberlet is difficult to exactly measure the low frequency flow - noise in pipeline. at the same time the insertion lose of water muffler in the low frequency was measured by the measuring chamberlet method

    本文分析了海水管路系統內流噪聲的產生機理，介紹了流噪聲的控制方法；分析了海水管路系統中流噪聲的聲場特性以及流噪聲管內、管外測量方法的優缺點；通過海水消聲器試驗測量臺架，利用測量小室驗證了混響箱法難以準確測量海水管路系統中的低頻流噪聲；用測量小室對水消聲器在低頻段的插入損失進行了測量。
  7. It is shown that, similar to the low frequency approximation, the more ideal the switching pair commutates currents, the less the switching pair contributes to the overall output noise

    我們證明了，與低頻近似模型相似，混頻器中的開關對的開關性能越好，則輸出噪聲越小。
  8. The major job is manufactured a transmitter, which has three upmixer channels. its function is to up convert the signals from c - band to ka - band. the input local oscillator is provided by a low frequency crystal oscillator which has a good performance of phase noise, through 512 times multiply to ka band. this sysetem is used in the laboratory as transmitter source of the fuze, for the multidimensional objects in practise, which lead to the complexity of the reflect signal, so the amplitude, frequency and the phase of the transmit signals both have a key role in dealing with the reflection signals. therefore, this system requires for both the coherence of the single channel ’ s amplitude, phase and multi channels

    本文的主要工作是應用戶要求製作一具有三發射通道的上變頻系統，可以將c波段的微波信號上變頻到ka波段的毫米波信號。系統的本振輸入基頻由一相位噪聲非常好的低頻率晶振提供，經過512次的倍頻放大至ka波段。本系統作為實驗室中引信的發射源，由於目標反射信號具有時變的多維性，反射信號變得極為復雜，在信號處理時，不僅信號幅值、頻率有決定意義而且相位關系也很有決定意義。
  9. Chaotic switching modulations introduce low - frequency harmonic spectrum of output voltage as random switching modulation. in some case, low - frequency noise ripple offset the effect chaotic switching modulations reduce the level of emi. it indicates that the ccfmfd integrates the advantages of spreading harmonic power at the multiples of the switching frequency and not introducing significant noise ripple at low - frequency range. among all chaotic switching modulations, the ccfmfd is considered as the best choice in applying to dc / dc converter

    與隨機調制模式相同，混沌開關調制模式也引入輸出低頻噪聲紋波，有些情況下低頻噪聲紋波可能抵消混沌開關調制降低emi水平的效果。分析表明： ccfmfd模式具有較好的降低emi水平和引入較小低頻紋波的優點，可以作為混沌調制模式較佳的選擇。
  10. This subject comes from the project : c band low phase noise tunnable jumping frequency source in chengdu saiying science and technology co, . ltd. the frequency synthesis technology of pll + mixer is adopted in the final scheme. at first, the developing history of the frequency synthesis technology is reviewed. then direct frequency synthesis technology 、 pll frequency synthesis technology are introduced

    本文首先首先簡述了頻率合成技術的發展歷史，介紹了直接頻率合成技術、鎖相環頻率合成技術、 pll +混頻的頻率合成技術的基本理論以及具體的系統設計中應該考慮的方面。
  11. Unlike the monostatic sar, two independent local oscillators are used for up / down conversion in bistatic case, so low frequency components of phase noise cannot be cancelled

    雙基地sar用兩個獨立的本振分別實現上變頻和下變頻，相噪低頻分量不能相互抵消，形成與單基地sar不同的低頻相噪。
  12. Study of low - frequency noise induced by marine propeller

    船舶螺旋槳低頻噪聲研究
  13. In the end of this chapter, the power spectrum density ( psd ) analysis of hrg is given, which shows that the main noise of hrg is low frequency noise

    論文還對陀螺信號進行了功率譜密度分析，分析結果表明陀螺的主要誤差都集中在低頻段。
  14. By using this method, the impact on depressing the partial vibration and the radiation of the low frequency noise of the structure underwater is efficacious

    採用增大局部結構剛度的方法，對于降低水下結構的局部振動與低頻噪聲輻射效果顯著。
  15. Measurement and assessment of low - frequency noise immissions in the neighbourhood

    相鄰建築低頻躁音侵擾測量和評估
  16. Measurement and assessment of low - frequency noise immissions in the neighbourhood - guidelines for the assessment for industrial plants

    相鄰建築低頻躁音侵擾測量和評估.工業設施評估指南
  17. The low frequency noise of the ring - stiffened cylinder with double shell is depressed by increasing structure stiffness, the numerical simulation is adopted to evaluate the acoustics performance, find that the vibration and acoustic radiation of the structure could be depressed by increasing the structure stiffness within the discontinuous range of the low frequency

    摘要通過增大雙層加肋圓柱殼的剛度降低低頻噪聲，使用數值模擬技術，評價結構的聲學性能，發現增大雙層加肋圓柱殼結構剛度，可在低頻段有限頻率范圍降低結構的振動與聲輻射。
  18. Pointing to the data obtained from semi - physical simulation of certain helicopter which mainly has low - frequency noise, a data - processing method of depressing and filtering noise from the signal, using the pagoda - structure re - constructing arithmetic and the wavelet transform principle, is proposed

    摘要針對直升機半物理模擬測量數據主要是低頻噪聲的特點，提出利用小波變換、塔式結構重構演算法，對信號進行降噪濾波處理的方法。
  19. Active noise control is an effective way to comtrol low frequency noise

    摘要有源消聲是一種有效的低頻噪聲控制方法。
  20. The low - frequency noise of propeller has constituted the main part of radiated noise of middle or high - speed marine

    螺旋槳低頻噪聲構成了船舶中高速航行時整個輻射噪聲中的重要分量。
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