Fluid noise mainly comes from out put pulsation of rate of flow, the main reason of out put pulsation of rate of flow is the instant high pressure return flow that obturation cubage produced when the big round curve pressure transition. the v trough on the port plate can reduce the fluid noise. in this paper, the author based on the acting of dam a river and condensability of liquid and used matlab language as tool to calculate the v trough on the original port plate and drew out the p - t diagrammatic curve and analyzed its shortcoming and improved the design of original v trough and got that the best size of its angle was 12. 3 and its length was 5mm and the cross section was an equilateral triangle
流體噪聲主要來源於輸出流量脈動,造成輸出流量脈動的主要原因是閉死容積在大圓弧段壓力切換時產生的瞬時高壓迴流,在配流盤上開設v型尖槽可降低因高壓迴流而引起的流體噪聲,本文以
截流作用和液體的可壓縮性為理論依據,以matlab語言為工具,對原配流盤上的v型尖槽進行了理論計算,繪制出p - t圖
線,分析了它的不足,並對原有v型尖槽進行了優化設計,得出了v型尖槽的最佳幾何尺寸:配流盤平面上的v型尖槽的兩邊的夾角為12 . 3 ,槽長5mm ,槽的橫
截面為等邊三角形。
Conic sections get their names because they take the shapes of the cross sections of a cone
我們稱這四種形狀為圓錐
截線,是由於以不同方法切割圓錐體,便可以得到這些形狀。
Desargues proved that the cross ratio is the same for every section of the projection.
Desargues證明了投射
線的每個
截線上的交比都相等。
Desargues proved that the cross ratio is the same for every section of the projection
Desargues證明了投射
線的每個
截線上的交比都相等。
The analyses of positive intercept of jack demarcate curve
千斤頂標定曲
線正
截距問題的分析
Yao ming, baseline, got him. . oh !. . yao ming turned it inside - out. that ' s hakeem olajuwon stuff
姚明,底
線,
截住他. . .哦! . . .姚明連續轉身。這像哈基姆?奧拉朱旺的玩法。
They were cut off from falling back on the left by the french line
他們被法軍散兵
線截斷了向左面撤退的道路。
Note : when actually applying, choose suitable type cable according to the pipe lenght, heat loss, work voltage, number of core wires. and core wire ' s section areas
注:實際選用時應根據管道長度、散熱量、工作電壓和芯
線數,計算芯
線截面而定。
In this paper global joint planning for middle and low voltage network is considered. both line arrangement and cross section and transformer arrangement and rate are considered. it is a non - line combined optimum problem more complex than single network planning
本文從整體的角度考慮中壓和低壓配電網路的聯合規劃,不僅考慮了
線路走向和導
線截面大小,而且考慮了變壓器的布置位置和容量,這是一個比單純的網架規劃更復雜的非
線性組合優化問題。
4 cross - sectional areas of connections and their corresponding testing current for temperature rise test is shown in table 4 ( the cross - sectional areas of connections externally wired by user should not be less than those in the table )
溫升試驗用連接導
線截面積與相應的試驗電流見表4 (用戶外接導
線或銅排的
截面積應不小於表中數據) 。
Neutron and gamma - ray cross sections for nuclear radiation protection calculations for nuclear power plants
核電站核輻射防護計算用的中子和射
線截面
After the comparison of the stability checking computations and the section categorised situation both at home and abroad the current standard, some problems was discussed in the standard of our country. contraposed these questions, the paper computed the space stability coefficient of some general t - shaped and l - shaped sections and all the sections of t - shaped, l - shaped and 2 - angle iron t - shaped in the formed - steel - table, and worked out the curves. according to the comparison of the curves the paper got and the curve in the standard, some simple conclusions was put
對國內外現行規范軸壓柱穩定驗算方法及柱子曲
線截面分類情況進行了對比,討論了我國規范曲
線中存在的一些問題,並針對這些問題,以規范初始彎曲值對任意「 t 」形和「 l 」形
截面和型鋼表中所有t型鋼、 l型鋼、雙角鋼t形鋼
截面的空間穩定系數進行了計算,作出其與規范曲
線的比較圖,通過計算結果的分析對各類
截面歸類情況作了簡單的評述,其中提出的一些建議可以作為規范修訂的參考依據;同時,這些計算結果也進一步證明了本文的柱子空間穩定分析方法的正確性。
Cable connectors for starter batteries ; screw terminals for conductor cross sections from 50 to 120 mm
起動機蓄電池用電纜連接器.第2部分:導
線截面范圍為5
Bus bars shall be of the same cross - sectional area throughout the switchgear
整個開關櫃的母
線截面均應相同。
Accordingly, such problems as single power source and multi - power resources network planning, path connection nodes and path wire section are resolved
解決了單電源和多電源網路規劃、線路交叉點及線路導線截面選擇等問題。