期刊文献+
共找到9篇文章
< 1 >
每页显示 20 50 100
基于符号计算法的桥梁墩台水平力计算分析 被引量:2
1
作者 王伟 《市政技术》 2017年第3期56-59,71,共5页
以符号计算法为基础,通过对桥梁墩台结构进行单元划分,建立各个计算单元的微分方程表达式,以高阶微分方程组的形式来表达整个墩台结构的内力变形关系,确定边界条件和变形协调条件,运用Maple数学计算软件进行求解及绘图。将所得结果与集... 以符号计算法为基础,通过对桥梁墩台结构进行单元划分,建立各个计算单元的微分方程表达式,以高阶微分方程组的形式来表达整个墩台结构的内力变形关系,确定边界条件和变形协调条件,运用Maple数学计算软件进行求解及绘图。将所得结果与集成刚度法的计算结果进行了比较分析,发现二者位移、弯矩及剪力的变化曲线基本一致。运用符号计算法可简化计算过程,减少计算工作量,方便快捷,准确度高,可为今后桥梁墩台水平力的计算提供一定参考。 展开更多
关键词 桥梁 墩台 水平力计算 符号计算 MAPLE软件 集成刚度法
下载PDF
新编柔性墩台水平力计算程序
2
作者 王欣南 董继恩 《交通科技》 2010年第B07期I0065-I0067,共3页
近年来,随着我国山区高速公路项目建设的蓬勃发展.变截面柔性高墩在常规桥梁设计中的应用也越来越多,柔性高墩的水平力分配问题亟待解决。文中详细阐述了新编柔性墩台水平力计算程序的适用范围、编制原理及计算结果验证。
关键词 集成刚度法 水平力计算 柔性墩台
下载PDF
竖井钢罐道水平力计算
3
作者 王建中 崔传杰 《建井技术》 2018年第3期29-34,共6页
多年来,竖井钢罐道水平力的计算仍沿用上世纪80年代末的经验公式。近年来,随着矿山建设技术的发展,出现了大量的深竖井,竖井终端荷载和提升速度也随之提高。南非、澳大利亚等国已将钢罐道水平力计算公式列入本国规范,而我国一直沿用的... 多年来,竖井钢罐道水平力的计算仍沿用上世纪80年代末的经验公式。近年来,随着矿山建设技术的发展,出现了大量的深竖井,竖井终端荷载和提升速度也随之提高。南非、澳大利亚等国已将钢罐道水平力计算公式列入本国规范,而我国一直沿用的经验公式已难以适应设计要求。基于此,综合分析了国内外竖井钢罐道水平力计算公式,充分考虑了各公式的适用范围和工程环境,给出了不同工况下的公式取值建议,可供相关从业者参考。 展开更多
关键词 竖井 钢罐道 水平 水平力计算公式
下载PDF
曲线梁桥墩顶水平力分配计算分析 被引量:2
4
作者 沈永林 《公路交通科技(应用技术版)》 CAS CSCD 2009年第11期141-142,共2页
文章采用空间梁格单元进行曲线折梁和直线梁上下部整体建模对比计算。结果表明,多孔曲线折梁桥各墩台顶水平力分配计算按展示直线桥和曲线桥计算时有差异。差异的大小主要与曲线半径、跨径、孔跨数、墩高差等有关。对斜桥、曲线或曲线... 文章采用空间梁格单元进行曲线折梁和直线梁上下部整体建模对比计算。结果表明,多孔曲线折梁桥各墩台顶水平力分配计算按展示直线桥和曲线桥计算时有差异。差异的大小主要与曲线半径、跨径、孔跨数、墩高差等有关。对斜桥、曲线或曲线折梁桥,尤其是墩高差异大的桥梁应按空间有限元建模进行计算,以确定各墩顶纵横桥向水平力的大小。 展开更多
关键词 桥梁工程 曲线折梁 水平分配计算 病害原因
原文传递
Analysis and Calculation of the Flow Pressure in the Multipoint Steam Injection String of a Horizontal Well 被引量:1
5
作者 Xu Xin 《International Journal of Technology Management》 2014年第9期72-74,共3页
The multipoint steam injection string of the horizontal well is a commonly used downhole component for high efficiency steam injection of the thermal recovery horizontal well. A reasonable layout of the valves to ensu... The multipoint steam injection string of the horizontal well is a commonly used downhole component for high efficiency steam injection of the thermal recovery horizontal well. A reasonable layout of the valves to ensure an even steam output of each point is still not well designed. At present, a general design method which is urgently necessary isn' t applied by each factory. According to the balance relationship of the momentum, the energy and the mass of the fluid flowing in the string, the pressure distribution equation of the fluid flowing in the multipoint steam injection string is built. On the basis of this equation, the design calculation method of the multipoint steam injection string is come up with. A specific example is given in the paper. Study shows that, with the equation built in this paper, the string can be designed with each axial valve having the same output, so that the technical demand of an even steam injection of the horizontal well section can be met. 展开更多
关键词 horizontal well multipoint steam injection PRESSURE CALCULATION
下载PDF
THE MODEL TEST RESEARCH OF HORIZONTAL FORCE ON RIGID SHAFT FURNITURE IN DEEP MINE
6
作者 刘志强 史天生 +1 位作者 郭晋蒲 王东权 《Journal of Coal Science & Engineering(China)》 1998年第1期15-19,共5页
The state of deep mine rigid shaft fUrniture horizontal force calculation in China is introduced and the calculating model of horizontal force is determined. Based on the interaction between hoisting vessel and shaft ... The state of deep mine rigid shaft fUrniture horizontal force calculation in China is introduced and the calculating model of horizontal force is determined. Based on the interaction between hoisting vessel and shaft furniture, the vertical mobel test device is built and a large number of model tests and analyses are carried out. At last, the relationship between horizontal force and hoisting end load, hoisting speed or bunton level interval is gained. The three parameters horizontal force calculating equation of beep mine rigid shaft furniture is given and it can guide the design and calculation of shaft engineering. 展开更多
关键词 rigid shaft furniture model test horizontal force calculating method
下载PDF
Accurate level set method for simulations of liquid atomization 被引量:4
7
作者 邵长孝 罗坤 +2 位作者 杨建山 陈松 樊建人 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第4期597-604,共8页
Computational fluid dynamics is an efficient numerical approach for spray atomization study, but it is challenging to accurately capture the gas-liquid interface. In this work, an accurate conservative level set metho... Computational fluid dynamics is an efficient numerical approach for spray atomization study, but it is challenging to accurately capture the gas-liquid interface. In this work, an accurate conservative level set method is intro- duced to accurately track the gas-liquid interfaces in liquid atomization. To validate the capability of this method, binary drop collision and drop impacting on liquid film are investigated. The results are in good agreement with experiment observations. In addition, primary atomization (swirling sheet atomization) is studied using this method. To the swirling sheet atomization, it is found that Rayleigh-Taylor instability in the azimuthal direction causes the primary breakup of liquid sheet and complex vortex structures are clustered around the rim of the liq- uid sheet. The effects of central gas velocity and liquid-gas density ratio on atomization are also investigated. This work lays a solid foundation for further studvin~ the mechanism of s^rav atomization. 展开更多
关键词 Computational fluid dynamicsLevel set methodSpray atomizationInterface captureBreakup
下载PDF
Static and Dynamic Study of a Wind Turbine Blade with Horizontal Axis
8
作者 H. Hamdi C. Mrad +1 位作者 R. Nasri A. Hamdi 《Journal of Environmental Science and Engineering》 2011年第9期1167-1174,共8页
In this work the authors present a calculation process of the blades for wind turbine with horizontal axis. It is about a blade discretized by the finite element method (FEM) in order to determine the gyroscopic eff... In this work the authors present a calculation process of the blades for wind turbine with horizontal axis. It is about a blade discretized by the finite element method (FEM) in order to determine the gyroscopic effect during its rotation at a high speed. A blade must have the maximum output and resist to aerodynamic loads distributed over its length, which are related to its geometrical characteristics and the speed of the wind. For that, the authors wrote the relations whom determine these loads according to the flow speed of the wind, then, the authors integrated them in the laws of structure mechanics to obtain the motion equations of the blade. This process was applied to a twisted blade with a length of 1.9 m, built out of pressed aluminum sheet with a profile of the type NACA; this profile gives the best aerodynamic output. This blade is an element of a three-bladed propeller for wind turbine of maximum power 5 kW. Finally, we visualized its deformations and then the authors checked its holding in service. 展开更多
关键词 Wind turbine aerodynamic load static and dynamic behavior gyroscopic effect.
下载PDF
Laminar Forced Convection from a Rotating Horizontal Cylinder in Cross Flow
9
作者 Prabul Chandran G.Venugopal +1 位作者 H.Abdul Jaleel M.R.Rajkumar 《Journal of Thermal Science》 SCIE EI CAS CSCD 2017年第2期153-159,共7页
The influence of non-dimensional rotational velocity, flow Reynolds number and Prandtl number of the fluid on laminar forced convection from a rotating horizontal cylinder subject to constant heat flux boundary condit... The influence of non-dimensional rotational velocity, flow Reynolds number and Prandtl number of the fluid on laminar forced convection from a rotating horizontal cylinder subject to constant heat flux boundary condition is numerically investigated. The numerical simulations have been conducted using commercial Computational Fluid Dynamics package CFX available in ANSYS Workbench 14. Results are presented for the non-dimensional rotational velocity α ranging from 0 to 4, flow Reynolds number from 25 to 40 and Prandtl number of the fluid from 0.7 to 5.4. The rotational effects results in reduction in heat transfer compared to heat transfer from stationary heated cylinder due to thickening of boundary layer as consequence of the rotation of the cylinder. Heat transfer rate increases with increase in Prandtl number of the fluid. 展开更多
关键词 Heated rotating cylinder Non-dimensional rotational velocity Flow Reynolds number Prandtl number
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部