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arc-length
相关语句
  弧长
     A Parameterized Algorithm of C~2 Nearly Arc-length Parametric Curve
     C~2参数曲线近似弧长参数化算法
短句来源
     C~2-CONTINUOUS NEARLY ARC-LENGTH PARAMETERIZEDCURVE
     C~2连续近似弧长参数化曲线
短句来源
     An Approximate Arc-Length Parameterization Method for Bézier Curves
     Bézier曲线的近似弧长参数化方法
短句来源
     A Nearly Arc-Length Parameterization Method with C~2-Continuous Preserving
     保持C~2连续的一类弧长参数化方法
短句来源
     A Nearly Arc-length Parameterization Method with C~2-Continuous Preserving
     保持C~2连续的一类弧长参数化方法
短句来源
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  孤长
     The nearly arc-length parameterized curve has desired approximation properties to the exact arc-length paramiter curve.
     近似孤长参数化曲线对于精确弧长参数曲线具有实际应用所期望的逼近性质 .
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  “arc-length”译为未确定词的双语例句
     the other is diameter of 17 mm and arc-length 1270 mm.
     另一种是in17 mm,放电弧长为1270 mm。
短句来源
     Application of Both Modified Newton-Raphson Iteration and Arc-Length Method to Pushover Analysis of Building Structures
     修正Newton-Raphson方法和弧长法在结构推覆分析中的联合应用
短句来源
     Nonlinear Analysis of Prestressed Frame Based on Arc-Length Method
     基于弧长法的预应力框架结构非线性分析
短句来源
     Application of arc-length control method to nonlinear finite element analysis of slope stability
     弧长法在边坡稳定非线性有限元分析中的应用
短句来源
     A high power xenon flashlamp with relative small-bore and large arc-length is manufactured based on the development of tube material and wall structure. Two specifications are researched: one is diameter of 16 mm and arc-length of(1140 mm;)
     在改进制灯材料和管壁结构的基础上,研制了两种不同规格的细长型高功率脉冲氙灯:一种是in16 mm,放电弧长为1140 mm;
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  arc-length
It is shown that the cross-sectional area as a function of arc-length is determined from the solution of a nonlinear boundary value problem.
      
Then, a simple constitutive equation is formulated by employing the above equations together with the relation between the magnitude of stress vector and the arc-length of strain trajectory for pure torsion.
      
A partly heuristic argument based on truncation error analysis leads to several suitable monitor functions, but also shows that the standard arc-length monitor function is unsuitable for this problem.
      
Arc-Length Method for Frictional Contact Problems Using Mathematical Programming with Complementarity Constraints
      
The mesh is constructed adaptively by equidistributing a monitor function based on the arc-length of the approximated solutions.
      
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The formulas to calculate rolling pressure have been derived on following assumptions: (1) flat compression instead of flat rolling adopted; (2) contacting area following friction rules divided into different regions; (3) energy of distortion condition of plasticity (nonprincipal axes) considered with accu-racy; (4) the nonhomogeneous distribution of longitudinal normal stress σx along the thickness of plate, which exerts an influence on the rolling pressure, estimated approximately.Even when sheets and strips...

The formulas to calculate rolling pressure have been derived on following assumptions: (1) flat compression instead of flat rolling adopted; (2) contacting area following friction rules divided into different regions; (3) energy of distortion condition of plasticity (nonprincipal axes) considered with accu-racy; (4) the nonhomogeneous distribution of longitudinal normal stress σx along the thickness of plate, which exerts an influence on the rolling pressure, estimated approximately.Even when sheets and strips are in cold-rolling, the accuracy of rolling pressure may be still improved in some extent (esp for the case of a greater friction factor) due to the adoption of the formula that derived according to the assumptions (3) and (4) as above. It is expressed as eq.(26)As to hot-rolling, the friction condition has to be considered. It would be unsuitable for applying Sims' formula indiscriminately supposing that the complete sticking between metal and roll occurs in any case. Quite a large error would take place while taking no account of friction condition, esp for higher mill speed and smoother surface of rolls because of the occurrence of complete sliding with so small friction factor. Whereas a compound frictional state would occur for the friction factor be increasing slightly. Thus, following formulas adopted.with complete sticking, formula (23)with complete sliding, formula (21)and with compound (medium) state, formula (20) Formulas of the mean pressure presented above are rather slmpie in form and may be applied to calculate rolling pressure in practice. Nomenclature.p-mean pressure;K-mean resistance to deformation in plane strain;l-contact arc length;h-mean plate thickness;f-friction factor;xb-length of sticking region, according to formula (16)

本文按如下的出发点导出轧制压力的计算公式:(1)以平面压缩过程代替轧制过程;(2)接触面按不同摩擦规律分区;(3)采用非主轴坐标系的形状变形能塑性条件;(4)近似估计纵向应力σ_x沿板厚不均匀分布对轧制压力的影响。导出的计算公式可用于计算冷轧板带和热轧中、薄板的轧制压力。

The blade (lug) of a blade-wheel is the basic element to interact with the soil. The driving profile of a double-curved-profile blade is the profile to obtain thrust and lift characteristics. It's geometrical parameters have highly significant effect on the mobility performance of the rigid wheel at wet paddy field.In order to develop and to design the geometrical parameters of the driving profile, there are two fundamental principles that must be kept in mind. The first principle is the fundamental law of conjugate...

The blade (lug) of a blade-wheel is the basic element to interact with the soil. The driving profile of a double-curved-profile blade is the profile to obtain thrust and lift characteristics. It's geometrical parameters have highly significant effect on the mobility performance of the rigid wheel at wet paddy field.In order to develop and to design the geometrical parameters of the driving profile, there are two fundamental principles that must be kept in mind. The first principle is the fundamental law of conjugate action between two meshing profiles, when two profiles are designed to produce a constant angular velocity ratio during meshing, they are said to have conjugate action. In order to transmit motion at a constant angular velocity ratio, the pitch point P must remain fixed, and the line of action must remain intersected the horizontal line at a constant pressure angle. The second principle is that the rolling motion and locus of any point of a slipping wheel must be used in developing the parameters of a blade.The rate of slip of a slipping driving wheel is the main parameter which relates with all other geometric parameters of blades. It acts some thing like the 'module m' of a gear profile.This paper analyses and deals with nine geometrical parameters of the driving profile of a blade. Those are.Top circle pitch circleBase circle Inclined anglePressure angle Radial height of profileContact length Arc length of profileRolling wheel angle within meshing The author derives the following equations to relate the nine parameters.1 . Rate of slip 5 and radius of pitch circle r, radius of top circle2 . The inclined angle (y) equation 0=1- ^-HULjSY-.3. The pressure angle (a) equationcos (tga) -tgasin (tga)b _ jTo compute the above two equations, the author develops his program using the Programmable casio fx-1 calculator, and obtains the value y and a with respect to 6, and plots the curves of the above equations. The curves intersect at a point which represents optimum value of inclined angle and pressure angle with respect to the rate of slip (y = a = 26.5%, o=14.87%) .4 . Radius of base circle (rg)rg = rcoscc = r0 (1-5) cosacos (tga) -tgasin (tga) = r0 -------- ------------- cosa5. The radial height (h)h"=r0 (1 -5) ( 1 -cosa) 6 . The arc length of profile (s) s= -i-rgtg2a0r20 sin2a 2rg7. Contact length (L)L = r0sina8. The rolling wheel angle within meshing? - L ro sina , 昬A + eA2=-^ + Y = - - - + Yrs rgFor a blade profile with 26.51? inclined angle and pressure angle, the rolling angle of wheel within meshing is 60. 08? and thus the minimum blades in one wheel are six. Six blades are sufficient to assure that there is always a blade in meshing with the soil.This paper lists out three tables of tractor test data which reveal the performance of 30? inclined angle blade wheel mounted on wheel tractors, riding tractors, and boat-type tractors. The data shows that the tractive efficiency of these three kinds of tractors with blade wheels are 48-54%, but for other wheels they are 10-43%.The author designs the optimum geometrical parameters of 26.50?blade wheels and compares them with the parameters of the 30癰lade wheels.The author hopes that the advanced theoretical study of the driving profile of a blade will give the tractor more tractive efficiency,and thus increasing the tractor's pull and obtaining the higher fuel efficiency. The fuel saving will give from 5 to 9 % for the paddy field wheel tractors.

木田叶轮的轮叶是参与土壤相互作用的基本元件。轮叶驱动面是轮叶产生推力、承力性能的工作面。轮叶驱动面的几何形状参数对驱动轮的工作性能和整机牵引性能有重要影响。本文提出确定轮叶驱动面几何参数的两个基本原则:一是机械原理的共轭啮合基本定律,要求啮合过程节点位置不变,压力角维持一定;二是符合驱动轮的滑转滚动轨迹和规律。本文提出以滑转率δ为最基本参数建立其他参数关系式。本文对轮叶驱动面下面九个几何形状参数进行分析:顶圆、节圆、基圆、倾角、压力角、轮叶高、叶形曲率弧长、啮合线长、以及一个轮叶与土壤啮合过程中的轮子转角。本文推导出上述几何参数与滑转率的八个关系式。其中,对轮叶倾角和压力角作了详细的分析,用编程序的电子计算器Casio·Pro·Fx-1将倾角、压力角与滑转率关系式(δ=1-(2sinγ-tgγ)/γ,δ=1-cos(tgα)-tgαsin(tgα)/1-tg~2α)进行连续计算并绘出两曲线,得出交点可作为倾角与压力角最佳值γ=α=26.51°,其相应最佳滑转率值为14.87%。根据上述原则,可推算出一个轮叶与土壤啮合接触过程的轮子转角,对于压力角及倾角等于26.51°的轮叶来说,轮子转角为68.08°,这样表...

木田叶轮的轮叶是参与土壤相互作用的基本元件。轮叶驱动面是轮叶产生推力、承力性能的工作面。轮叶驱动面的几何形状参数对驱动轮的工作性能和整机牵引性能有重要影响。本文提出确定轮叶驱动面几何参数的两个基本原则:一是机械原理的共轭啮合基本定律,要求啮合过程节点位置不变,压力角维持一定;二是符合驱动轮的滑转滚动轨迹和规律。本文提出以滑转率δ为最基本参数建立其他参数关系式。本文对轮叶驱动面下面九个几何形状参数进行分析:顶圆、节圆、基圆、倾角、压力角、轮叶高、叶形曲率弧长、啮合线长、以及一个轮叶与土壤啮合过程中的轮子转角。本文推导出上述几何参数与滑转率的八个关系式。其中,对轮叶倾角和压力角作了详细的分析,用编程序的电子计算器Casio·Pro·Fx-1将倾角、压力角与滑转率关系式(δ=1-(2sinγ-tgγ)/γ,δ=1-cos(tgα)-tgαsin(tgα)/1-tg~2α)进行连续计算并绘出两曲线,得出交点可作为倾角与压力角最佳值γ=α=26.51°,其相应最佳滑转率值为14.87%。根据上述原则,可推算出一个轮叶与土壤啮合接触过程的轮子转角,对于压力角及倾角等于26.51°的轮叶来说,轮子转角为68.08°,这样表明叶轮的最少叶数为六个,便可保证任何时刻都有轮叶与土壤啮合接触。本文列出多年来按上述原则设

On the basis of two fundamental assumptions: The plane strain and the film internal force,this paper states at first the basic principles of design for plastic dams filled up with water .Then the formula of transverse internal force in the dam is determined by equations of static equilibrium. And according to the geometrical properties of such plastic dams,a series of formulas related to the arc length of the cross-section and the volume of the dam are successively derived out one by one.

本篇从平面问题和薄膜内力两个基本假设出发,首先阐明充水橡胶坝设计的基本原理。然后根据静力平衡条件,确定坝袋断面内力的公式;并按照坝袋的几何性质导出有关坝袋断面周长和容积计算的系列公式。

 
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