wind frequency 中文意思是什麼
wind frequency
解釋
風頻率-
According to inhere frequency. 1 design the tmd and it " s parameter and fix it. calculate the result of this status under the wind power
、根據橋機的固有頻率設計tmd和其參數。根據橋機的結構，安裝tmd並計算安裝tmd后在相應的風載下橋機的響應。 -
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。 -
This is because that frequency shift can also be found in the wind vortex over the arctic ocean, u - wind in beaufort sea, v - wind in east siberian sea and the pdo index
因此，除熱力因素外，動力因素引起的海冰的平流與該變頻現象也存在一定的聯系。 -
Speed mode control of variable - speed constant - frequency wind energy generation system with double fed induction generator
變速恆頻雙饋風力發電系統的速度模式控制 -
The thesis is about the work around the centerpiece of varying speed constant frequency wind power generation unit
本文圍繞變速恆頻風力發電系統這個主題，進行了以下幾方面的研究工作。 -
Our research analyzes comprehensively the sand data, such as thickness distribution, velocity distribution, frequency distribution of sand incipience velocity, expatiates the behaviors of these two sand incipiences in wind - blown - sand flow, then our research amends some deficiency of relative researches
本文全面分析了沙粒濃度分佈、速度分佈和沙面上起動沙粒速度參數的頻率分佈等，闡述了兩種沙粒起動方式在風沙流中的不同表現，並對相關研究資料中的不足進行修正。 -
The paper has done all - around study on the ac excited of variable - speed constant - frequency ( vscf ) wind power generation. the author has done thorough study on the vscf wind power generation technology using wound - rotor doubly - fed induction generator, from simulation to experiment, from theory to practice. he also did at large theory analysis to the vscf wind power generation technology using cascaded brushless doubly - fed generator, and has established stability theoretical foundation for continue study work
本文對交流勵磁變速恆頻風力發電領域的關鍵技術進行了較為全面的從模擬到實驗、從理論到實踐的深入研究，同時對具有廣泛潛在應用前景的級聯式無刷雙饋發電機變速恆頻風力發電技術也進行了洋盡地理論分析，為今後進一步的深入研究奠定了一定的理論基礎。 -
In this paper, several scheme of vscf is compared firstly, of which gets doubly - fed generating mode. doubly - fed vscf wind power generating system uses a doubly - fed induction generator, which rotate speed can be able to change with wind turbine, and it ensures a constant - frequency output, by controlling the frequency of current input into rotor windings. in vector trans control system, the control of stator active power and the control of stator reactive power can be essentially decoupled, and the former is via torque component and the latter is via exciting component of stator current
本文首先比較了幾種變速恆頻方案，從中選擇了雙饋式變速恆頻方案；它運用雙饋電機的工作原理，允許發電機轉速變化，而在電機轉子側接入低頻勵磁電流，通過控制該電流的頻率，保證雙饋電機定子輸出的頻率恆定；再結合矢量控制技術，通過調節轉子電流來控制定子電流的轉矩分量和勵磁分量，相應獨立地控制發電機輸出的有功功率和無功功率。 -
Furthermore, the isoline maps of mean wind pressure coefficients and rms wind pressure coefficients of the structure under various wind directions are plotted. in the matter of theoretical analysis, modeling with finite element method, using the local mean wind pressure coefficients and time history of fluctuating pressures determined in wind tunnel, the wind - induced dynamic responses for long - span grid roof structures are calculated in frequency domain and time domain separately
在理論分析方面，建立合理的有限元模型，利用剛性模型風洞試驗獲得的各種不同情況下屋面各節點的平均風壓系數和脈動風壓時程，在頻域內和時域內進行了大跨網架屋蓋結構的風振響應分析。 -
And the 30 - 60 day low - frequency character is more distinct in flood years than in drought years ; ( 2 ) the relationship of low - frequency olr and zonal wind is greatly different in drought years and flood years
重點研究的旱、澇各4個年份的分析結果表明，澇年olr場的30 60天振蕩比旱年更為顯著。 -
At the same time, a lot of electrical energy is wasted when the level is high and the working curve is displaced. so urgent affairs are choosing right timing ways to rebuild the pumps. applying frequency conversion timing to wind machines and pumps is an important technology in our country
設計都按照長江、漢水百年一遇最低水位選擇水泵出水揚程，這樣在高水位時往往由於揚程太大而偏離水泵的工作高效區，浪費了大量電能，選擇合適的調速方式對泵船水泵機組進行節能改造，成為當務之急。 -
Based on research of wind turbine aerodynamic characteristics, this paper analyzed various control methods for a pitch - controlled system of variable - speed and constant - frequency wind turbine at a wind velocity range higher or lower its speed rating respectively
摘要在風力機空氣動力學特性分析的基礎上，討論了變速恆頻風力機組變槳距機構在低於額定風速階段和高於額定風速階段的不同控制策略。 -
The paper studies the pitch - regulated structure and stand - alone control system about mw wind turbine group. the background of the paper is " mw variable - speed constant - frequency wind turbine group ( no. 2001aa512022 ) ", which is supported by national 863 plan
本文以國家863計劃《兆瓦級變速恆頻風電機組》 （課題編號： 2001aa512022 ）為背景，主要研究了兆瓦級風電機組的變槳距機構及其單機控制系統。 -
The characteristics of wind turbine generators as well as features of the fixed pitch wind turbine generator and the variable pitch wind turbine generator are presented, emphasizing on the variable speed constant frequency ( vscf ) generating system based on doubly - fed generators and on the control system for pitch angles
在簡述風力機特性的基礎上，介紹了定槳距和變槳距發電機組的特點，重點分析了基於雙饋發電機的變速恆頻發電系統及槳葉節距角控制系統。 -
This product, adopted pwm integrated circuit and mosfet, igbt that were imported from the overseas, has the following merits : quick - response, strong interfere - proof, stable frequency and voltage, low consumption when light loading, high efficiency and reliable performance, it can be applicable to the family use, pasture region, work with the wind generator and some other places where the power failure often occurs
本品採用pwm （脈寬調制）集成電路和進口大功率mosfet 、 igbt等器件，具有應變快、抗干擾、自動穩定頻率和電壓、空載損耗低、效率高、性能可靠，是家庭，牧區，風力發電機配套以及其它野外經常停電地區提供交流電的必備的電器。 -
The main purpose of this study is to simulation a random fluctuation of wind velocity fitted to specified power spectrum in low frequency range in our wind tunnel
本文研究的目的是在風洞中模擬風速隨機波動的陣風，這個基礎性工作對于開展風洞中的其它研究有著重要意義。 -
Other subordinate components such as high - frequency oscillation in the actual wind stress data weaken the intention of el nino / la nina events
同時說明在原始資料中的高頻振蕩等其它次要成分起到了削弱elnino lanina事件強度和范圍的作用。 -
One components of the equipment : sf - ggp - 1solid state hf high frequency welder machine is composed by four parts : sor dc power supply vibratory output. touch screen plc control and wind - water exchange water cooling system
一， sf - ggp全固態高頻焊機主要由scr dc電源部分振蕩輸出部分觸摸屏plc控制部分三部分組成。 -
In the paper, the computing method based on the non - steady wind pressure in frequency domain is applied to the calculation of roof structure of shanghai south railway station
摘要為了研究結構參數對復雜大跨空間結構風致振動的影響，以上海南站工程屋蓋結構為例，利用基於非定常風荷載的風致動力響應頻域分析方法，對結構的抖振響應進行參數分析。 -
It is showed in buffeting analysis that the analysis results in time domain agree well with those in frequency domain. effect of pylon wind field can increase the lateral buffeting response of pylon. nonlinear factor can decrease the nature frequency of cable - stayed bridge, and can increase the vertical and torsional buffeting response
時域抖振分析結果表明：大跨度斜拉橋抖振的時域和頻域分析方法具有較好的一致性；考慮橋塔風效應會顯著增大橋塔的橫橋向抖振響應；非線性因素會降低斜拉橋的自振頻率，會增大斜拉橋的豎向及扭轉抖振響應。
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