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弹性点支承     
相关语句
  elastic supports
     THE STATIC CALCULATION OF DOUBLE CONTINUOUS BEAM ON DISCRETE ELASTIC SUPPORTS
     双层弹性点支承连续梁的静力计算
短句来源
     A NOTABLE PROBLEM IN THE CALCULATION ABOUT THE FINITE LONG CONTINUOUS BEAM ON DISCRETE ELASTIC SUPPORTS
     弹性点支承有限长连续梁计算中一个值得注意的问题
短句来源
     It is pointed out that on the condition that the parameter DL~3/EI is very small, the system of linear equations satisfied by the displacements of generalized structural nodes is ill-conditioned, where EI is the flexural rigidity of the continuous beam, D the rigidity coefficient of the elastic supports and D the span. of the continuous beam.
     弹性点支承有限长连续梁,当抗弯刚度EI、支点刚度系数D和跨距L组成的参数DL~3/EI很小时,广义结构节点位移列向量所满足的线性方程组是病态的。
短句来源
     An approach to calculate the double continuous beam on discrete elastic supports(a practical engineering structure) by finite element method is provided in this paper.
     本文提出了一个利用有限单元法计算一个实际的工程结构──双层弹性点支承连续梁的方法。
短句来源
     The adopted model is a structure in which the rail joint is considered to be two semiinfinite long beams,on discrete elastic supports,joined with an elastic hinge.
     该方法采用的计算模型将钢轨接头看作半无限长连续弹性点支承梁用弹性铰连接的结构.
短句来源
更多       
  elastic point support
     Considering the wheel and trac as a big coupling system,the rails as simplified Euler-beam with limit length lying on an elastic point support,and contact relation between wheel and rail as spring contact,the dynamics model of the system is established.
     本文基于车辆 -轨道耦合大系统的思想 ,将钢轨简化为弹性点支承有限长的欧拉梁、轮轨接触关系采用弹簧接触 ,建立了轮轨动力学模型。
短句来源
  supported by elastic point
     Vibrant Analysis of Rectangular Slab Supported by Elastic Point of the Interior
     内部为弹性点支承的固支板的振动分析
短句来源
     According to deflection function of the beam supported by elastic point of interior,the vibration of slab supported by elastic point of interior were analyzed and got better results,adopting multiple domain approach and Galerkin approach.
     以内部为弹性点支承的简支梁的挠度函数为依据,采用multipledomainapproach与Galerkinapproach分析了内部为弹性点支承的四边固支与四边简支矩形板的振动问题,获得了较好的结果。
短句来源
     The method is the same with vibrant analysis of slab supported by elastic point of the interior to other boundary condition.
     该方法适用于内部为弹性点支承的其它边界条件的板的分析。
短句来源
  elastic point supports
     SPLINE FUNCTION SOLUTION TO THE PROBLEM OF RAILWAY TRACK STRENGTH AND CONTINUOUS BEAM ON ELASTIC POINT SUPPORTS
     铁路轨道强度及弹性点支承连续梁的Spline函数解法
短句来源
     Using Fourier series, this paper presents a solution to the free vibration of rectangular orthotropic plates which carry concentrated masses and rest on symmetrically distributed elastic point supports or line supports or partial surface supports.
     利用重傅里哀级数得到了附有集中质量的正交各向异性矩形板在弹性点支承、线支承和面支承下的自由振动解。
短句来源

 

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      elastic supports
    to investigate strain increase in the transverse direction of the slab when the rigid supports are replaced by the elastic supports.
          
    When existing simple span bridges are converted into continuous spans, rigid support conditions have to be changed to elastic supports in order to absorb and distribute the energy of horizontal motion due to an earthquake loading.
          
    However, development of additional reaction forces and stresses on the slab due to unequal displacement of the elastic supports have been overlooked.
          
    Durability of the concrete slab under the elastic supports is also discussed.
          
    This is useful for certain bending problems of rectangular plate on elastic supports.
          
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    On the basis that the deflection curves of track rails and continuous beam on elastic point supports are cubic curves, we establish the simultaneous matrix equation satisfied by the deflection and differential quotient of second order of the deflection curve, using the knowledge of spline function and engineering mechanics. Thereby we can solve the deflection, moment and share of the rail. At the same time, the deflection curve is obtained naturally. Compared with the finite element method, the method put forward...

    On the basis that the deflection curves of track rails and continuous beam on elastic point supports are cubic curves, we establish the simultaneous matrix equation satisfied by the deflection and differential quotient of second order of the deflection curve, using the knowledge of spline function and engineering mechanics. Thereby we can solve the deflection, moment and share of the rail. At the same time, the deflection curve is obtained naturally. Compared with the finite element method, the method put forward in this paper has the following merits: derivation of the formula is forthright; the train of thought is clear it is easily adapted for computation on computer and the amount of computation is comparatively small.

    本文从集中荷载作用下铁路轨道的钢轨及弹性点支承连续梁的挠曲曲线是三次Spline曲线出发,利用Spline函数和工程力学基本知识,建立了挠曲曲线位移及二阶导数列向量满足的联立矩阵方程,从而可以解得钢轨位移、弯矩及剪力,同时,自然地给出挠曲曲线的表达式。与有限单元方法比较,本文方法具有公式推导简捷,思路清晰,便于计算机计算,而且计算工作量较小等优点。

    In this paper, a finite element dynamic analytical model of railway train/frog system is presented, where the vertically loaded cast frog is simplified as a continuous nonuniform beam on many discrete unequal elastic supports. By means of the minimum potential energy principle and a direct integration algorithm superior in both stability and accuracy for linear problems-the average acceleration method (the trapezoidal rule), the train/frog vertical vibration equations are established and solved. Dynamic response...

    In this paper, a finite element dynamic analytical model of railway train/frog system is presented, where the vertically loaded cast frog is simplified as a continuous nonuniform beam on many discrete unequal elastic supports. By means of the minimum potential energy principle and a direct integration algorithm superior in both stability and accuracy for linear problems-the average acceleration method (the trapezoidal rule), the train/frog vertical vibration equations are established and solved. Dynamic response of train, frog and sleeper at all necessary locations is obtained. The influences of many factors e. g. Frog pad stiffness, train speed, frog wear to dynamic response are analysed. The optimum stiffness range of frog pad for 60 kg/m track is 2.94 × 10~4~5.88 × 10~4kN/m.

    本文根据辙叉区轨道构造特点,提出了辙叉区非均匀弹性点支承变截面连续梁轮轨动力有限元分析模型。应用最小势能原理导出了系统运动方程,并用无条件稳定、精度最佳的平均加速度方法直接积分求解。计算得出轮轨接触点、辙叉区咽喉、理论尖端、心轨宽20、50、70mm断面处等位置的钢轨件,最大冲击力作用处的轨枕以及簧上、簧下质量的各项动力效应;分析了轨下垫板刚度、列车速度、辙叉磨耗量等各种因素对辙叉区轮轨竖向动力效应的影响,特别是轨下弹性垫层的影响;提出了最佳轨下弹性垫层刚度值范围。并就减小辙叉区动力效应,延长辙叉使用寿命问题提出某些建议。

    From the point of view of systems engineering, a unified model for the railway vehicle and track as a whole system is established in this paper. The theory of vehicle-track coupling dynamics is advanced for the first time by the author. This unified model is a mixed one involving both the lumped and the distributed parameters in which the vehicle is considered as a multi-body system and the track as a Euler beam on a continuous elastic foundation consisting of the three layers of rail. sleeper and ballast. The...

    From the point of view of systems engineering, a unified model for the railway vehicle and track as a whole system is established in this paper. The theory of vehicle-track coupling dynamics is advanced for the first time by the author. This unified model is a mixed one involving both the lumped and the distributed parameters in which the vehicle is considered as a multi-body system and the track as a Euler beam on a continuous elastic foundation consisting of the three layers of rail. sleeper and ballast. The Hertzian nonlinear elastic contact theory is used to describe the wheel/rail coupling characteristics. The fast numerical analysis method is applied to simulate the responses of the vehicle-track cupling system, and the numerical experiment method is used to study the numerical stability of integration, the modal convergency of rail and the effective calculated length of rail. The theoretical simulation results are compared with the test data of a few major experiments carried out at home and abroad, showing the soundness of the vertical model of vehicle-track system.

    本文应用系统工程的方法,首次将铁道车辆系统与轨道系统作为一个总体大系统加以考察,建立了车辆-轨道垂向统一模型,提出了车辆-轨道耦合动力学理论。统一模型为集总-分布参数混合模型,其中车辆表示成10自由度多刚体系统模型,轨道描述成3层连续弹性点支承无限长Eu1er梁模型,轮轨耦合关系采用Hertz非线性弹性接触理论。文章介绍了垂向耦合动力学的快速数值分析方法,并应用数值试验方法研究了数值积分稳定性、钢轨模态收敛性及轨道有效计算长度。通过将理论模拟结果与国内外主要大型试验测量结果进行对照,验证了车辆-轨道垂向统一模型的正确性。

     
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