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。
After canvassing the basic theories and methods of reliability and optimization design of the transmission system, analyze the designs of the v - belt transmission, arc cone gear and disk spring separately. it is propitious to raise efficiency, improve capability, increase reliability, and decrease cost and so on
在研究了機械可靠性優
化設計基本理論和方法之後,分別分析了v型帶傳動、圓
弧錐齒輪、液壓卡盤碟型彈簧的可靠性優
化設計,對其進行針對性的研究,並通過試驗對設計結果進行檢驗。
The relation of radius of curvature and error as well as formulas of increasing parameters on condition of constant error are diverted. the equation of the line on the center of approximate circular arc is obtained , and it can avoids the trouble that numerical solution owns possibility of no convergence and simplifies node calculation of non - circular curve
導出了曲率半徑與逼近誤差之間的關系和等誤差條件下的參數遞推公式,建立了通過逼近圓
弧圓心的直線方程和圓心坐標計算公式.按這種方法用圓
弧逼近平面參數曲線,不需要求解非線性方程組,避免了計算可能不收斂的麻煩,簡
化了非圓曲線的節點計算過程
This area was in an arc and rear - arc basin on convergent plates in the middle devonian
其巖石
化學及地球
化學顯示島
弧火山巖特徵。
4. it is the first time that eclogite conglomerates are discovered in maotangchan and fenghuangtai formations. this suggests that ultra - high pressure metamorphic rocks in the dabie orogenic belt exhumed to the earth ' s surface in lower cretaceous. the geochemistry data indicates that the protoliths of the eclogite gravels formed in a structure setting of volcanic arc
首次在毛坦廠組、鳳凰臺組中發現了榴輝巖礫石,這一發現表明大別造山帶超高壓變質巖在早白堊世已經折返到地表,而且地球
化學研究表明這些榴輝巖礫石的原巖形成於巖漿島
弧構造背景。
Research on kinematics of prolate epicycloid planetary transmission and optimum replacing tooth profile by arc
長幅外擺線行星傳動運動學研究及齒廓圓
弧優
化替代
In the simplified model the feeder switches are regarded as the vertexes and the feeder lines as the arcs of a graph
簡
化模型把配電網描述為有權的節點和
弧的圖,在此基礎上進行故障的定位、隔離和恢復處理。
A new model of distribution system is presented, whereby, the feeder switches are regarded as the vertcxes of a graph and the feeder lines are regarded as the arcs. the method to model distribution networks by adjacent table is put forward. therefore, storage size is reduced and calculation is speeded up
建立了配電網的簡
化模型,即將饋線開關當作圖的頂點、將饋線當作
弧,採用等長鄰接表的數據結構來描述配電網,大大減少了佔用空間和提高了查詢速度,並建立了基於等長鄰接表的配電網路拓撲演算法。
And apatite. by these analyses and comparison with general granite both in china and the world and with the granite in other au or cu belt in china, the characteristics of the granite in this area are concluded as follows. it belongs to magnetite - i or syntectic granite and has crust - mantle mixed characteristics ; it was formed mainly by crystallization differentiation of melting magma and multiphase varied intrusion ; the degree of differentiation evolvement is not high ; the granite and its enclaves p. re congenetic ; the range of temperature is about 500 - 700, the range of pressure is about 2. 50 gpa - 4. 35 gpa, and the range of oxygen fugacity ( lg fo2 ) is - 15. 53 - - 14. 00 ; most granite bodies formed before the collision of plates, and few formed after the collision of plates
通過對測試數據的分析與綜合研究,並同中國和世界一般花崗巖類以及中國主要金、銅成礦巖體的花崗巖類進行對比,得出本區花崗巖類巖石具有以下特徵:屬磁鐵礦-型或同熔型花崗巖,其巖漿物質具殼幔混源特徵:主要由熔融態巖漿經結晶分異作用,通過多期變速上侵而形成;其分異演
化程度較低;寄主巖基和包體具有同源性;巖石的形成溫度范圍約為500 - 700 ,壓力大約為2 . 50gpa - 4 . 35gpa ,氧逸度值1gfo _ 2為- 15 . 53 ? 14 . 00 ;該巖帶主要形成於板塊碰撞前消減的活動板塊邊緣期,為燕山至喜馬拉雅早期的大陸邊緣火山
弧環境的產物。
Make and design one personal exhibition location, just as play a modern drama, protagonist in the drama, it is our products, and the thought behaving in the darma, is our culture, in the design idea of goss, red, white, bule enterprise color is under the embodiment of the arc model exhibition location, make the whole exhibition location more smooth, more modern, the background of the scene inside the large - scale factory, understanding goss of printing machine on it make it is like audience on the spot in person not participating in the exhibition, understand " it is demand but innovation " goss of culture
製作設計一個展位,就像出演一部話劇,劇中的主角,是我們的產品,而劇中表現的思想,就是我們的文
化,在高斯的設計理念中,紅、白、藍的企業色,在
弧線造型展位的體現下,令整個展位更加流暢、現代,大型工廠內部場景的背景,使參展觀眾身臨其境般的了解高斯印刷機,了解「為需求而創新」的高斯文
化。
A study on expression and purification of tdh - related hemolysin gene of vibrio parahaemolyticus
副溶血性
弧菌直接溶血相關毒素蛋白的純
化及性質初探
The paper also does some deep research on the mesh characteristic of the mechanism, analyses the cause o f the cam profile error and index error during working, using object - oriented method, vc + + and pro / toolkit, performs second development to pro / engineer, completes entity proplasm of the cam mechanism using only few parameters, the press angle calculate module, error analysis module and curvature calculate module are built on the basis of it
然後通過對
弧面分度凸輪加工中產生廓面誤差及工作時產生分度誤差原因的分析,建立了計算加工和分度誤差的數學模型。應用vc + +和pro toolkit對pro engineer進行二次開發,建立了
弧面分度凸輪機構的參數
化設計和三維造型及壓力角、誘導主曲率等運動特性和誤差分析軟體系統。
Metal argon arc welding of red copper and low carbon steel
紫銅與低碳鋼的熔
化極氬
弧焊
Optimal design of multi - section circular arc limited martingale
多段圓
弧極靴優
化設計問題
Effect of technological factors on electric insulance of micro - arc oxidated ceramic coat on aluminium
影響鋁微
弧氧
化陶瓷層電絕緣性的工藝因素探討
In the wrscs, the self - consistent model is used to describe the complex configurations of the particulate composite and the temperature field is solved by weighted residual collocation method with some proper simplifications. this method provides a more efficient way of setting up the algebraic equations corresponding to the governing differential equations. the prediction formula for the effective thermal conductivity of the composite is obtained
權殘自洽方法可以用於描述不同形狀夾雜的復合材料的微觀結構,通過對不同幾何形狀角點做適當的圓弧化處理,採用加權殘值數值計算方法的配點法將求解微分控制方程變為求解線性方程組,進而得到任意形狀夾雜內部的溫度場,建立含不規則形狀夾雜的復合材料有效熱導率的預測公式。