流速觀測 的英文怎麼說

中文拼音 [liúsùguāncè]
流速觀測 英文
velocity gauging
  • 流 : Ⅰ動1 （液體移動; 流動） flow 2 （移動不定） drift; move; wander 3 （流傳; 傳播） spread 4 （向壞...
  • 速 : Ⅰ形容詞（迅速; 快） fast; rapid; quick; speedy Ⅱ名詞1 （速度） speed; velocity 2 （姓氏） a surna...
  • 觀 : 觀名詞1. （道教的廟宇） taoist temple2. （姓氏） a surname
  • 測 : 動詞1. （測量） survey; fathom; measure 2. （測度; 推測） conjecture; infer
  • 流速 : [機械工程] velocity of flow; strength; [水文] current velocity; current speed; flow rate流速管 pi...
  • 觀測 : observe; observation; viewing
  1. 3. a three - dimensional - acoustic doppler velocimeter has been used to measure the velocity and turbulence in a compound channel with vegetated and unvegetated flood - plains. particulary in the interface region between main channel and floodplain. the distribution in three coordinate directions of velocity and turbulence intensities and the renolds stresses are presented. the momentum transfer at the main channel flood - plain interface can be described as an apparent shear stress which can be quantified as a function of the local turbulence at the interface

    採用adv對灘地種樹前後灘槽交界區域的流速場進行了量測。分析了灘槽交界區域的垂線流速、紊動強度和雷諾應力的變化。將灘槽交界的動量傳遞描述為一表觀應力，這個表觀應力可以看作是交界面處的脈動函數並將其定量化。
  2. In the measurement, the sample flows slowly in the pipeline, and the pressure in the pipeline will change with the time, the sample ’ s apparent viscosities with different shear rates can be acquired

    使血樣在密閉管道中緩慢流動，通過對管道中壓力（即流速）隨時間變化的測量以求得不同切變率下血樣的表觀粘度。
  3. A transparent model is used to make the deflection jet board grounded on the inhere enlarged dimensions. the finished experiments are conducted to catch the flow rate directions and the situation of cavitation using a high - speed video cameras. in this paper, the finite element analysis and visualiation research of servo valve prestage jet flow field are carried out, which establish the theoretical foundation for mathematical model of servo valve prestage and the whole mathematical model of hydraulic servo valve

    在對射流前置級驅動的伺服閥射流流場數值模擬的基礎上，用有機玻璃在偏導射流板原始尺寸的基礎上進行了擴大，製作了透明的偏導射流板，運用高速攝像機、液壓泵站等組成了可視化實驗系統，對射流流場的流速方向、渦流、氣穴等現象進行了多方位的觀測，並通過對接收管接收壓力的測試，對流場分析結果進行了驗證。
  4. The research of system makes the observational information of tongbo dam realize standardization manage, tidy up and analyze the information quickly and exact, give the environmental physics number and diagnostic numer of displacement, stress and seepage, build the mathematical model of each observational information, evaluate the working modality of the dam, thereby ensure safe working of the dam

    系統的研製使桐柏抽水蓄能電站的觀測資料實現規范化管理，快速、準確地整理、分析觀測數據，給出環境物理量及位移、應力和滲流等觀測效應量的特徵值，建立各觀測效應量的數學模型，分析評估大壩的工作形態，從而保證大壩的安全運行。
  5. Research on water hammer with gas in pressure conduit system through physical experiments, researches on pressure conduit system with gas releasing and liquid column separating, which consist of observing flow patterns, testing the conditions under which liquid column separation brings into existence and the water hammer in water interception collision, and studying effects resulting from gas content and different water velocities in pipeline, was done

    3 、輸水管道系統中含氣水錘研究通過物理試驗，對有壓輸水管道系統中的氣體釋放與液柱分離進行了研究，觀察其流態、測試液柱分離發生的條件及斷流彌合水錘壓力，研究了含氣量、流速等參數對液柱分離的影響。
  6. ( 3 ) using the csim4, the arctic sea ice equilibrium state was simulated reasonably. the simulated ice thickness distribution pattern very like that detected by submarine investigations. the simulated ice concentration and motion are similar to the observation

    模擬的海冰厚度分佈與潛艇探測的海冰厚度分佈具有一致性；模擬的海冰密集度、海冰流速與觀測相近，模擬的海冰氣候態是合理的。
  7. Through having done field surveys in the campus of chongqing university, this paper tested classroom indoor and outdoor climate parameters in june, july and september of 2005, it used questionnaire to acquire subjects ’ thermal sense, draft sense and humidity sense in classroom each month, and programmed composition to compute predicted mean vote and compared pmv with the field testing results of mean thermal sensation vote. it is discovered that pmv is overvalued the college student ’ thermal sensation in chongqing. it finds that people in chongqing adapt to the typical summer hot and winter cold sweltering weather

    對重慶地區高校教室的現場調查，測試了重慶大學2005年六月、七月和九月教室室內外熱環境參數，通過採用問卷主要掌握了受測對象教室里的冷熱感、氣流感和潮濕感，通過編製程序求得預測平均熱感覺評價pmv的值，比較pmv和問卷調查得到的平均熱感覺mtsv ，發現pmv預測值高估了重慶地區高校學生的熱感覺，這里的人群對重慶這種夏熱冬冷地區比較典型的悶熱氣候具有一定的熱適應性，對現場問卷調查的結果進行分析，得出了室內空氣溫度、氣流速度、相對濕度與人體主觀感覺之間的回歸曲線，發現重慶地區高校學生熱中性時的空氣溫度為25 . 5 ， fanger根據歐美人群調查得到的公式計算出的預測熱感覺為中性時的空氣溫度為25 . 0 ，兩者相差0 . 5 。
  8. Against two kinds of nonlinear friction observers, the analytic expression of zero ve - locity interval t based on the nonlinear model of brushless dc motor system is deduced in this paper. simulation results indicate that the system performance at low velocity can be im - proved effectively using the friction observer based on coulomb friction model

    針對兩種不同的非線性摩擦觀測器，推導了基於無刷直流電動機非線性模型的零速度時間間隔腡解析表達式，通過模擬證實，利用基於庫侖摩擦模型的摩擦觀測器可以有效地改善系統的低速控制性能。
  9. In order to decrease the cost, simplify the structure of the pmsm servo system and at the same has no effect on the system performance, this paper uses hall element as the position sensor, which has very low solution but very low cost, and in order to realize sinusoidal current drive of pmsm, this paper presents a new rotor position estimator based on flux estimation

    為了降低成本，簡化系統，本文採用低解析度的霍爾元件作為pmsm伺服系統的位置傳感器，採用基於磁鏈觀測法的低解析度位置傳感器控制技術，來估計電機轉子的實時位置和轉速，實現電流的正弦換向，減小轉矩脈動。
  10. On the basis of the field data of water temperature, a new formula for estimating water temperature of river by using meteorological factors is put forward by using the method of least squares

    摘要結合某流域水溫原型觀測資料，通過分析水溫與氣溫、太陽輻射、濕度和風速之間的相關關系，採用最小二乘法建立了水溫與氣溫、濕度和風速三者之間的多變量函數方程式，提出了一種利用氣象因子估算天然河道水溫的新公式。
  11. Unsteady separated flow, produced during the gate - opening period in the reverse radial gate tunnel of a high - lift shiplock, is characterized by negative pressure and high velocity as well as their intense fluctuations in space and time and could easily result in various harmful phenomena such as cavitation, gate vibration and sonic boom, which have been observed and confirmed by prototype and physical model tests

    高水頭船閘輸水反弧閥門開啟過程中，后廊道內發生急變分離流，負壓、高速水流以及壓力與流速的劇烈時空脈動變化容易誘發空化空蝕、門振和聲震等有害現象已被原型觀測和物理模型試驗研究證實。
  12. The report confirms previous observations that the prevalence of the epidemic is levelling out in many places, as death rates and new infections come into balance in countries such as lesotho ( see chart )

    這份報告確認了以前的觀測，即許多地區傳染病的流行水平在死亡和新增感染速率達到平衡時會進入相對穩定階段，例如在賴索托（參見表格數據） 。
  13. In this paper, a novel dc speed control system has been introduced, the auto - disturbance rejection controller ( adrc ) has been used in the speed loop

    摘要一種新型的直流調速系統，速度環採用自抗擾控制器，該控制器對系統的內部擾動和外部擾動進行觀測，並加以補償。
  14. Refined grids were utilized in a large - eddy simulation model for obtaining high - resolution planetary boundary data and analyzing surface layer turbulence. simulation results showed that refined meshes reduced turbulent contributions of subgrid scales, sensitivity of simulation results to sgs parameters decreased, and features of the whole boundary layer were explicitly resolved better. results also revealed flux - profile relationship correctly in surface layer and a good agreement of turbulent velocity characters with observation. therefore, it concluded that the les method was able for simulation of surface layer flow and turbulence, and might be used for further applications

    採用加密網格的大渦模式獲取邊界層風溫場的高解析度模擬結果，並據以分析近地面層大氣的湍流特性。結果表明，較小的網格尺度使次網格湍流貢獻率大為降低，模式計算結果對次網格參數的依賴性減小，邊界層整體特徵得到更好的反映。同時，模擬出的近地面層通量廓線關系及湍流速度特徵與實際觀測結果吻合甚好，表明模式具有反映近地面層平均運動和湍流特性的能力。
  15. Qualitative and quantitative measurements of disturbances in channel suspensions are carried out using dye emission and piv techniques

    然後採用染色線流動顯示技術與粒子圖像測速技術對槽流懸浮流的擾動波特性進行定性和定量觀測。
  16. The approach of physical model will take longer time and charge more money although it will give us some direct impression. because of the restriction by mode scale, velocity measuring is quite difficult. especially the flow feature is difficult to describe accurately

    盡管物理模型實驗給人較為直觀的印象，但投資較大、周期較長，由於受模型比尺的限制，流速測量十分困難，尤其是水下流態難以得到準確描述。
  17. Just using the stator currents, stator voltages, and velocity, the method proposed in the paper makes real time identification of induction motor parameters based on the least squares identification algorithm. the method does n ' t use the rotor flux signal, avoiding the coupling between the rotor flux observation and the parameter identification

    本文提出僅用電機的定子電流、電壓和轉速進行電機參數的辨識方法，它利用遞推最小二乘法進行在線參數辨識，該方法不需要觀測得到的磁鏈信號，消除了磁鏈觀測和參數辨識的耦合。
  18. In the paper, the principle and actualizing means of spatial vector control have been systemically discussed and the control software has also been designed. the magnitude of both the rotor flux and the current in torque component have been estimated by using a flux observer, which is developed based on field orientation control principle. the results show that the observer has a good feature due to its speed being calculated without speed sensor or additional hardware

    本文對矢量控制的原理、控制方法以及控制實施策略進行了較為系統的分析與研究，利用速度間接觀測理論，建立了異步電機的磁通觀測器，電機的定子磁通和電流的轉矩分量可以通過磁通觀測器估算出來，從而得到電機的轉速，並由此建立了異步電機無速度傳感器矢量控制的理論數學模型和相應的控制演算法，在此基礎之上，利用工程中常用的電機專用dsp晶元tms320lf2407作為處理器，對異步電機進行變頻調速控制。
  19. Limited by time this paper focused on three areas : ( 1 ) basic dtc principal study and research ( 2 ) the design of speed regulator of dtc ( 3 ) a new kind of stator flux observer because the dtc system is a nonlinear system and we ca n ' t grasp the parameters completely, the classic speed regulators design method is not fit for dtc system

    由於時間有限，本文所進行的研究工作主要集中在三個方面： （ 1 ） dtc基本原理的學習與實現（ 2 ） dtc中轉速調節器的設計研究。 （ 3 ）新型定子磁鏈觀測器的研究。 dtc所具有的非線性和參數不可知的特性決定了直流調速系統的轉速調節器的設計方法不能完全適合於dtc系統。
  20. In a reynolds number range of 150 < 6500, a particle image velocimetry ( piv ) is used to measure and visualize the 2d flow over a backward facing step

    摘要利用粒子圖像測速技術（ piv ） ，對雷諾數150 < 6500范圍二維後向臺階的流動進行詳細觀測。
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