The present utilization and existing problems in water resource of the north of huaihe river in anhui are introduced. based on such research objects as northern guo river of bozhou, jiangtang of fuyang and key city zones, a mathematical model with systems engineering viewpoint is established and used to investigate in water resource problems in the area. the main contents are as following : ( 1 ) groundwater resource and present utilization ; ( 2 ) mensuration of calculational parameters of groundwater and calculational methods ; ( 3 ) economic parameters of irrigation areas ; ( 4 ) establishing northern wo river forecast model with finite element method, areal well - group method and water balance method ; ( 5 ) establishing optimal water resource allocating model for northern jiangtang and new cihuaixin river irrigation area and investigating in the combination of surface water and groundwater, optimal agricultural planting - mode and optimal distribution proportion of various water sources ; ( 6 ) some existing exploitation problems and advices about water resource in the area
本論文針對淮北地區水資源開發利用現狀及存在問題,以安徽亳州
渦河以北地區、阜陽姜堂鄉和重點城市區為研究對象,運用系統工程觀點,採用數學模型方法,對該區水資源問題進行了綜合研究,主要內容為: ( 1 )地下水資源及開發利用現狀; ( 2 )地下水計算參數測定和計算方法; ( 3 )灌區經濟參數; ( 4 )採用有限單
元法、面狀井系法、水均衡法,建立亳州
渦河以北地下水位預測模型; ( 5 )建立阜陽姜堂及茨淮新河北部的農灌區水資源優化配置模型,應用系統分析的方法,研究地表水與地下水聯合運用,農業最優種植模式及各種水源的最佳分配比例; ( 6 )淮北地區水資源開發利用存在問題及建議。
Designs and manufactures turbine engine test cells and wind tunnels
設計生產
渦輪發動機測試單
元和風洞。
These applications, as in most machine elements, have developed into many standard forms, such as spur, bevel, helical, and worm gears
大多數機器
元件的這些應用已經發展成許多標準形式,例如柱齒、傳動齒輪、螺旋齒輪及
渦輪齒輪。
Through the analyzes of electromagnetic system of a axial symmetry by the method of electromagnetic vector potential, an eddy current field math model is build by triangle cell, this article has researched the effect of power frequency to eddy current density, penetration depth and the skin effect
本文以電磁場矢量位有限
元法為基礎對二維軸對稱場的磁場強度、
渦流密度進行了計算求解,採用三角形單
元和六面體單
元建立了
渦流場數學模型,研究了電源頻率對
渦流密度、透入深度及集膚效應等場量的作用影響。
Workers can be equipped with hill, north alliance, hill pushed torque converter ( single grade four - turbine components increase power and increase torque ) with isuzu enhanced feicheng driving axle or axle
可配備山工、北聯、山推變矩器(單級四
元件雙
渦輪提高功率,增大扭矩)配備五十鈴加強型驅動橋或肥城車橋。
Before giving the numerical solution, the finite element method and how to make the finite element analysis for 3d time - harmonic electromagnetic fields and 3d eddy - current fields are introduced in detail
在此之前,詳細介紹了有限
元方法以及三維時諧電磁場的有限
元分析方法和三維
渦流場有限
元分析的a - , a法。
In this thesis, studies are made on the problem of time - harmonic electromagnetic fields excited by an arbitrary current dipole in spherical conductor. the problem is presented in eddy - current nondestructive test and geophysical prospecting. under the condition of magnetic quasi - static state, the boundary - value problem about modified magnetic vector potential is solved and the analytical solution is obtained
本論文針對
渦流無損檢測和地球物理勘探領域用到的球導體中時諧電流
元的電磁問題做了研究,在磁準靜態近似下,求解了修正磁矢量位的邊值問題,獲得了問題的解析解,並利用通用有限
元分析軟體做了數值驗證。
The equation of the pressure of scroll chambers 、 the force of axis 、 the force of radial 、 the force of tangent 、 inertial force 、 the composition of forces and the inertial movement is given. a dynamic model of scroll compressor of combination profile is developed, based on the analysis of the movement of the moving parts. this can provide base of theory for dynamical balance design 、 intensity design and reliability analysis
論文利用pro / e軟體建立新型組合曲線
渦旋壓縮機動
渦盤的三維實體模型,在此基礎上根據受力情況對動
渦盤的
渦圈進行了有限
元分析,探討動
渦盤在工作過程中由於氣體力的作用而產生的應力與應變規律,為進一步完善動
渦盤的設計提供了理論依據。
There are five parameters need to be measured. there are five channels for input : the displacement of casting - roller, the rotate speed of casting - roller, the pressure of casting and rolling, the casting temperature and the water - speed of cooling water. they are measured by raster, photoelectric coder, strain pressure sensor, thermocouple and turboflowmeter
系統需要進行監測的參數有五個,即有五路輸入信號:鑄輥位移、鑄輥轉速、鑄軋壓力、澆鑄溫度、冷卻水流速,分別採用光柵、光電編碼器、應變式壓力傳感器、熱電偶和
渦輪流量計作為檢測
元件。
The paper establishes mathematics model of electromagnetic heating system of eddy current field and temperature field, and gives corresponding discrete format with elements as eight nodes, hexahedron equal cell, through calculating eddy - current field to gain the internal heat source that the temperature field needed, to use discrete method to solve the problem of induction - heating part ' s temperature field by axial symmetrical electromagnetic, and then to analyze the characteristic of instantaneous temperature field
本文建立了電磁加熱系統的
渦流場和溫度場間接耦合的數學模型,分析了不同頻率下
渦流和溫度的分佈情況,並以八節點六面體等參
元為例給出了
渦流場對應的離散格式,通過計算
渦流場獲得溫度場所需要的內熱源強度,加熱部件的溫度場以軸對稱格式進行離散求解,並對瞬態溫度場有限單
元法的求解特點進行了分析。
Against a prototype which is being produced , its three dimension end region entity model of stator is established , and with the aim of simplifying calculation , the theory of how to simplify entity model is studied , then the theory is made use of , and the end region entity model of stator is simplifi - ed ; meshing characteristics of three dimension entity model and shortcomin - gs of end region entity model of stator are studied , then meshing method of three dimension end region entity model of powerformer stator is studied as well , and the simplified entity model is meshed with this meshed model , the distribution of end region magnetic field of stator is analyzed , and the magnetic field energy and reactance of powerformer end region are calculated and compared with design value because the prototype is being produced , in this paper , stator core , gap and eddy equipment are not taken into consideration , and this has a little influence on the result , but through analysis , the result is proved to be good through the example calculation , it is known that the method of this paper is useful and through theoretic analysis , it is proved that end region
針對一臺生產中的樣機,對其建立了定子端部三維實體模型,而且為了達到簡化計算的目的,研究了如何將其簡化的理論,並應用這些理論對樣機定子端部實體模型進行了簡化;研究了三維實體模型的剖分特點和定子端部實體模型存在的缺點,在此基礎之上,研究了對簡化的powerformer定子端部三維實體模型的剖分方法,並且對簡化的實體模型進行了剖分。應用剖分的三維實體模型,用有限元法分析了powerformer定子端部的磁場分佈,計算了端部區域的磁場儲能,並利用磁場儲能計算了powerformer定子端部漏抗,將計算值與設計值進行了比較、分析。由於樣機處在設計生產階段,本文暫時沒有考慮定子鐵心、氣隙和渦流器件對端部磁場的影響,這對分析結果有一定的影響,但是仍然得到較好結果。