滑流系數 的英文怎麼說
中文拼音 [gǔliúxìshǔ]
滑流系數
英文
coefficient; slip-
The forecast is quantitative analysis in the paper. the amounts of cargo flow are forecast by generation models of transportation demand and the directions distributing of cargo transportation are forecast by distribution models. the forecast methods which have already been used for amounts of cargo transportation are trend inference method, smooth method of index and grey system method ; the forecast methods which have been used for cargo transportation distributions are fratar method and furness method
預測od流主要運用了定量分析預測法。 od生成預測用到的預測方法有趨勢外推法、指數平滑法和灰色系統法等； od分佈預測用到的預測方法有佛萊特（ fratar ）法和弗尼斯（ furness ）法。In the positioning servo - system, which generally is configured by the d. c. pulse width modulator ( pwm ) velocity governing system and position servo - loop, the parameter perturbance of pwm velocity loop really exist by reason of such as the load behavior ; power voltage supply ; operating setting value, etc. 1, 2 ， and it cannot be ignored. by using the identification technique to form the mathematical model of the system, authors have confirmed the facts. therefore, to design the discrete sliding mode controller ( dsmc ) of the positioning servo - system, the perturbed parameters value bounds of the pwm velocity loop, which is as the controlled plant of position servo - loop, should be accounted. consequently, the design principle of dsmc for accounting system with parameter perturbance is proposed by the authors. the proposed method can ensure the stability of system with parameter perturbance and the behavior of non - overshoot, fast precise positioning. in order to reveal the effects of the design method, the comparative research work is done by the authors. also, it has been tested in an industrial experiment, the results proved it is satisfactory
由直流脈寬調速系統（ pwm ）和位置環構成的定位系統中，速度環的參數隨負載特性；電網電壓；給定工況而攝動是不容忽視的.作者通過系統辨識建模也證實了這一事實1 ， 2 .因此在設計位置環的離散滑模控制時，必須針對速度環（即位置環的控制對象）的參數攝動范圍採用「對象參數攝動離散滑模控制器的設計方法」 ，以確保系統在參數攝動時的穩定性和快速、無超調、準確定位的優良動態品質.為剖析該設計方法的控制效果，本文作了對比性研究，並將該設計方法用於工業試驗中，取得了滿意的結果The paper described the building process of model that can identify the shock - absorber parameter of landing gear and at the same times optimize performance of system. in this paper, there are also some debate, it include identifying parameter which can not be measured, such as the air polytropic exponent and the orifice discharge coefficient of shock - absorber
本文利用復合形優化演算法建立了起落架緩沖系統參數識別與系統優化模型，對緩沖器空氣壓縮多變指數和油孔流量系數等不可測參數的識別和著陸、滑跑載荷多目標優化問題進行了討論。The blade inner channel cooling is a complex convection - conduction coupling problem. this thesis build a three - dimension. compressible turbulence model, and give a general solve method. with the geometrical model of the glossily rectangle straight channel, the rectangle straight channel with in - line arrays disturb plates, the rectangle straight channel with staggered arrays disturb plates, the rectangle straight channel with slant disturb plates, this thesis compute the flow and heat transfer condition when the cold air path though these channels, and gain the temperature field, pressure field, velocity filed, in addition. this thesis also analyze the influence of the different channel height, the different channel materials, the different channels, and gain the function relation between he nusselt number, friction factor and reynolds number. this thesis is emphasis on the new heat transfer enhancement structure, that is, disturb plates, with the comparison with the glossily channel and channel with pin fins, the heat transfer enhancement effect of the former is better, and the conclusion can be used in the design of aircraft blade
葉片內部通道冷卻是一個復雜的對流?導熱耦合傳熱問題，本文在分析葉片內部通道冷卻的流動與傳熱情況的基礎上，建立了三維、可壓縮紊流的物理模型，得到了通用的求解辦法；利用不帶擾流片的矩形直通道、帶順排擾流片矩形直通道、帶叉排擾流片、帶傾斜擾流片的矩形直通道的幾何模型，計算了冷卻空氣通過這幾種通道時的流動與換熱情況，得到了各種不同情況下計算區域的溫度場、壓力場、速度場；在此基礎上分析了不同的通道高度、不同的葉片通道材質對葉片內部通道冷卻的影響，並整理得到了各種通道形式下，努謝爾數和阻力因子與雷諾數的函數關系；本文重點研究了新型的葉片內部通道冷卻強化傳熱措施?帶擾流片的內部冷卻通道的強化傳熱效果，通過與光滑矩形直通道、帶針肋通道的冷卻效果的比較，表明了這種新型鮚構的優勢，對于葉片內部通道冷卻結構的設計可以起到指導的作用。Secondly, the identification algorithms of road traffic status are studied including methods of determining floating car sample sizes which are based on “ the relationship between floating car sample sizes and accuracy of traffic information detection ” and “ the relationship between floating car sample sizes and requirement of road network information detection ”. the road traffic identification algorithm grounded on the journey - time is analyzed. besides, road traffic identification algorithm based on average speed is put forward and the validity of these two methods is analyzed in the thesis
主要工作包括:從「浮動車數量與交通流信息檢測準確性關系」 、 「浮動車樣本數量與路網全方位信息檢測需求關系」兩方面對浮動車數量確定方法進行研究，給出了演算法模型;同時，分析了基於行程時間的道路交通判別演算法，提出了基於指數平滑法的平均瞬時速度道路交通判別演算法，並對兩種演算法的有效性進行分析比較。With the development of automobile industry and road transportation ， the traffic accidents happen every day in the world and become a serious society problem the vehicle collision accidents are over 2 / 3 times as much as all traffic accidents they cause a large amount of social infuence and serious economic loss therefore ， it is urgent to study vehicle collision accidents comprehensively and systematically ， and the research also is the academic foundation to analyze and deal with traffic accident it is difficult to authenticate car velocity after traffic accident to dig over locate witness is right way mechanics is avaid tool in this field it is important to establish math model and this is precondition to calculate vehicle velocity firstly on the basis of summarizing the research results ， this paper deeply discusses the calculating model to analyze the instantaneous motion state in the vehicle collision, the interrelation among the every moving mechanics parameters in the every phase of the collision secondly ， according to the collinear collision and two - dimension collision and the restitution coefficient ， the paper estabishesthe post collision movement models it proves that these models are correct and valid thirdly ， this paper try to research reconstruction of road traffic accident and put forward the method on it
對交通事故的科學分析應是建立在正確的數學模型與計算機模擬技術基礎上的定量分析，其基本條件就是要有能正確描述事故過程中汽車狀態的數學模型，只有建立正確的數學模型，才能較準確地推定事故車輛的碰撞速度。所以建立正確地車輛碰撞模型和運動模型正是汽車事故再現的關鍵問題。本文首先在總結前人研究的基礎上，深入地研究汽車碰撞理論，分析了車對車碰撞作用瞬間狀態的計算模型及碰撞恢復系數與碰撞前、后速度的關系；其次，根據交通事故中最普遍的一維和二維碰撞的不同情況，採用恢復系數和滑動摩擦系數等概念，分別建立了碰撞后車輛動力學模型；第三，對汽車碰撞事故再現進行了初步研究，確定了車對車碰撞事故模擬計算和反推計算方法，並給出相應的模擬程序流程圖。Abstract : it introduces the principle of graphite electrode abrading tool and develops the software and hardware of nc machine. this can detect the position of platform feed with great inertial - mass through photoelectrical encoder, the vibration magnitude of translation worktable with eddy transducer. based on these the machine parameters can be automatically regulate, and the grinding process is smooth
文摘:介紹了石墨電極研磨成形機的原理和數控軟、硬體系統的研製開發；用光電編碼器實現了大質量進給滑臺的位置檢測；並用電渦流傳感器檢測平動臺振動量，進而實現了機器參數的自動調整，從而保證了石墨電極研磨成形機研磨加工的順利進行。For a class of shunt - wound active power line conditioner, based on analysis of mathematical model of system and target of control, the algorithm of fuzzy variable structure sliding mode control is presented. the control algorithm can avoid complicated calculation of harmonic electric current in traditional control algorithm, and realize the feedback control of electric current. the algorithm is simple and easily implemented
針對一類並聯型有源電網調節器在分析系統數學模型和控制目標的基礎浙江大學博士學位論文上，提出了模糊滑模控制策略，避免了傳統控制方法中復雜的諧波電流計算，實現對電源電流的閉環控制，該演算法簡單、易於實現，模擬結果證實了變結構滑模控制的有效性。Afterwards, combining mathematical model with simulation model, the moving air traffic flow in airport was further analyzed ; the algorithms of random flight generation, departure waiting list and taxiing flow optimization was proposed to construct the airport practical evaluation model
然後，結合數學規劃模型和模擬模型，進一步分析了機場空側系統空中交通流的運動情況，提出了隨機飛機流增減演算法、跑道頭離場等待隊列和滑行飛機流優化演算法，構建以實際飛行計劃為依據的機場實際容量評估模型。The inverted pwm changing electric current the technique is applied in the prototype model. the prototype model was tested and operated on spot, power factor could reach beyond 0. 95, the effect of following modulating voltage was better, the curve of factor of modulated voltage of exchanging systems changed following load rate was linear, the output of wave form was a flat and steady sinusoidal wave
樣機採用了逆變式pwm變流技術，對其進行了現場測試與試運行，測試結果是電網側的功率因數可達0 . 95以上，跟蹤調壓效果良好，變流系統輸出調壓系數（ k ）隨負載率（ p ）的變化曲線基本滿足直線關系，輸出波形呈平滑穩定的正弦波。Abstract : the comprehensive fem analysis for the shimen arch dam and its abutment is carried out as an example to demonstrate the proposed method utilizing the monitoring data for calculation. based on teh back analysis of permeability coefficient and tensile strength of the seam between dam and foundation, the 3 | d seepage flow and elastoplastic fem analysis of arch dam and its abutment are conducted. the safety factor against sliding of arch dam is determined using some different methods to verify the stability of the dam
文摘:本文以石門拱壩為例，說明基於原觀資料進行拱壩及其基礎的綜合分析的方法.內容包括：在反演擬合滲透系數和壩與基巖接觸面的抗拉強度參數的基礎上，進行壩址區三維滲流場分析、拱壩與基礎的三維線彈性、彈塑性力學分析，並用多種方法探求了拱壩抗滑穩定安全系數On the basis of utilizing geometric conversion and modification principle of spur and helical gears, the mathematical model for geometric parameters and modification of overlapping coefficients of gear was established, and the calculation method of sliding frictional coefficients under elasto - hydrodynamic lubrication state was introduced, thus let the calculation method of meshing efficiency of gears be more coinciding with the practical application
在運用直、斜齒輪幾何換算和變位原理的基礎上，建立齒輪的幾何參數和重迭系數修正的數學模型，介紹了彈流潤清狀態滑動摩擦因數的計算方法，從而使齒輪嚙合效率計算方法與實際應用更吻合。Based on the analysis and discussion of characteristics and law of gear engagement under condition of elasto - hydrodynamic, a calculation method on sliding and rolling work loss of standard spur gear transmission had been put forward, and the relationship of geometric parameters and overlapping coefficients of gear with sliding work loss was revealed
摘要基於彈流潤滑狀態下的齒輪嚙合特性及規律分析和討論，提出了標準直齒傳動的滑動功損及滾動功損的計算方法，揭示了齒輪的幾何參數和重迭系數與滑動功損的關系。According to the structure layout of futang power station design, geological parameters and calculation results of seepage, the stability and stress of gate chamber and retaining dam are calculated, the security index and stress of anti - slide can can meet the requirement of criterion
根據福堂電站工程設計的結構布置情況、地質參數及滲流計算成果，對閘室和擋水壩穩定、應力進行了計算，其抗滑穩定安全系數及應力標準均滿足規范的要求。The relevance functions between total pressure recover coefficient and the parameters ( mach number, angle of attack, flow coefficient, angle of sideslip ) for subsonic submerged inlet in turbojet and turbofan engine were investigated
摘要根據某埋入式進氣道試驗數據建立了計算埋入式亞聲速進氣道總壓恢復系數的經驗公式，表現為關于馬赫數、流量系數、攻角、側滑角的函數。Numerical models were used to study how the infiltration into a slope varies with the rainfall intensity, rain fall duration, soil properties and how the infiltration influences the stability of a slope. a numerical program is coded to solve the transient seepage field by using the finite element and finite difference methods based on the saturated - unsatured soil seepage theory. a model for considering the variations of soil weight and shear strength is created / constructed and the corresponding program is coded
本文針對受降雨影響顯著的非飽和殘積土土坡，運用飽和?非飽和土壤水分運動的理論和二維非穩態滲流有限元模型，模擬雨水入滲引起的暫態滲流場，將計算所得到的暫態孔隙水壓力分佈用於考慮了基質吸力影響的土坡穩定安全系數的計算當中，建立了考慮非飽和土土坡從雨水入滲到出現滑坡危險全過程的計算模型。Taking into account thermal and non - newtonian effects of the lubricant, this paper has theoretically investigated elastohydrodynamic lubrication of involute spur gears, and achieved the pressure distribution, film shape, temperature distribution and the values of the friction coefficient and its varying law along the line of action of gear transmission
本文在考慮了潤滑劑的熱效應和非牛頓效應后，對漸開線直齒輪的彈流潤滑問題進行了理論研究，獲得了齒輪傳動的壓力分佈、溫度分佈、油膜形狀和齒面摩擦系數的取值范圍及其沿齒輪傳動嚙合線的分佈規律。This thesis discusses detailedly the flow process of ip multicast, error discovery method and error recovery method, and also proposes a new error control method to implement reliable multicast in computer supported cooperative design system : serial integrates with timer are used to discover error, arq mechanism based on nak feedback is modified to correct error, " sliding window " mechanism is imported to make up the drawbacks of traditional nak, and " slotting and damping " technique is used to resolve the question of " feedback implosion " which results from multicast reliability control
詳細研究了ip多播傳輸的流程、數據傳輸的差錯檢測方法及差錯恢復方法，提出在協同設計系統中實現可靠多播的控制方法：利用序列號和計時器相結合的方法進行傳輸數據的差錯檢測，改進了基於nak反饋信息的arq重傳機制來實現差錯恢復，並引入了滑動窗口機制來解決傳統nak方法的不足，採用「時間分槽?抑制」技術來解決由於進行多播可靠控制而產生的「反饋內陷」問題。Based on the major parameters deduced the traditional experiences and a lot of experiments, this paper brings forward a new, on hydrodynamics computing equation of the circulation oil volume of the lubrication system and the minimize pressure required in the main oil channel, also says briefly several part resistance coefficient which is used usually
以傳統的、由大量實驗而得出的發動機潤滑系統各主要參數為基礎，提出了一種新的、以流體力學為依據而得出的潤滑系統循環油量和各泄漏量的計算公式，以及主油道所需最低油壓的計算公式；簡要地介紹了潤滑系統中常見的幾種局部阻力系數。A kind of grid generation method based on two - dimension poisson equtions is devlop - ed into the grid generation method based on three - dimension poisson equtions in this dessertation. use this method, this paper generals the grids of glide bullet to increase range that is at three states, that is with no control rudder and no tail wing, only with tail wing and with control rudder and tail wing. this paper has calculated the aerodynamic coefficients of glide bullet to increase range that is at three states. beside this the paper has given the results and analysised the differences of the three states, and the effects of control rudder and tail wing to the lift and drag. this can give us some information about the ability of the control ruder and tail wing for increasing the range
本文在二維泊松方程網格生成方法的基礎上推導出了一種三維泊松方程網格生成方法。並利用該方法生成了繞彈體、尾翼彈、滑翔增程彈三種不同彈形的流場網格。計算了超音速來流下彈體、尾翼彈，滑翔增程彈三種不同彈形的空氣動力學系數，分析了三種不同彈形計算結果的差別；分析了控制舵和尾翼對升力和阻力的影響。分享友人