汽车钢圈疲劳寿命的有限元分析

钢圈是位于轮胎和车轿之间承受负荷的旋转部件,其作用是安装轮胎,承受轮胎与车轿之间各种作用力和力矩,对汽车行驶的安全性、稳定性、平顺性和牵引性均起着重要的作用。基于名义应力法的分析过程及有限元分析软件,探讨了钢圈弯曲工况下结构强度及疲劳寿命预估的方法。通过理论计算、实际使用情况及弯曲疲劳试验的结果验证了所提方法的正确性,所提方法可在产品设计阶段就预测设计产品的使用寿命及结构特点,为钢圈的设计及优化提供依据。     

多功能轮椅车设计及其有限元分析

设计了一种新型的、具有移动行驶、下肢康复训练、高端取物等功能的多功能轮椅车.通过建立多功能轮椅车的有限元模型,对轮椅车整体结构强度进行有限元分析,提出了改进措施,从而降低产品开发成本和缩短开发周期.     

Thermo-mechanical finite element simulation and validation of rubber curing process

Journal of Mechanical Science and Technology - Vulcanization, or curing, is a very important process in producing useful rubber products. The curing process takes place when heat is transferred to...     

基于Ansys Workbench的矿井架空乘人装置驱动轮支架的有限元分析

应用参数化设计软件Pro/E对架空乘人装置的驱动轮支架进行三维建模,将建好的模型导入AnsysWorkbench软件进行有限元分析,并以此为依据对驱动轮支架进行改进设计,再对改进后的支架进行有限元分析。改进前后的有限元分析结果对比显示,改进后的零件机械性能得到提高,为提高矿井架空乘人装置的可靠性提供了参考。     

基于实验测试及有限元分析的起重机车轮轮压研究

利用有限元分析和实际检测对比,进行车轮的非线性受力分析,得知不同测点位置的受力状态非线性,同时也显示变化趋势的等值线性变化。通过车轮在不同轮压载荷下建立实际检测的受力应变变化曲线,可以了解同型号车轮实际装配现场的装配质量和效果。鉴于轮压便于测试的特点,一般的起重机械都是固定运行和吊装的,受力状态也是有规律的,所以可以通过车轮的轮压实时监测了解该起重机的实时运行状况。     

Thermo-mechanical finite element model of friction stir welding of dissimilar alloys

A thermo-mechanical finite element model is developed based on Coupled Eulerian Lagrangian method to simulate the friction stir welding of dissimilar Al6061-T6 and Al5083-O aluminum alloys using different tool pin profiles. The model is validated using published measured temperatures and weld microstructure. The finite element results show that maximum temperatures at the weld joint were below the materials’ melting point. Placing the harder alloy (Al6061-T6) at advancing side led to a decrease in maximum process temperature and strain rate, but increased tool reaction loads. Featured tool pin produced better material mixing resulting in enhanced joint quality with reduced volumetric defects.     

高速货车车轮摩擦力对钢轨承载区域影响的有限元分析

以钢轨为研究对象,针对现场实际监测过程中,货车重量监测值随行车速度提高而变小的现象,分析随速度增大的摩擦力对钢轨承载区域的影响.利用ANSYS有限元分析软件建立钢轨有限元模型进行静力学仿真,通过详细的结果数据对比表明,钢轨承载区会随着摩擦力的方向产生偏移,且偏移量随摩擦力的增大而增大.     

钢轨应变分布场的有限元分析

应用ANSYS软件建立了钢轨的有限元模型。通过对钢轨模型的有限元分析,得出了不同工况条件下的钢轨上应变场的变化趋势,得到了不同工况处的中性线上节点的数据,并应用数学方法找到了在钢轨中性线上对应变敏感的确切位置。这些数据为以后弹性体的粘贴以及钢轨传感器的设计奠定了基础。     

全液压伸缩臂式换轨车结构设计及有限元分析

铁路的高速发展对长钢轨铺换车(简称换轨车)提出了更高的要求。为解决现有换轨车体积大、易掉道和工况适应能力差等弊端,研制出一款全液压伸缩臂式换轨车,利用换轨部件、伸缩臂和配重等的设计来解决上述问题。采用理论计算、有限元法以及实验测量对载荷进行详细分析,并根据实际作业情况设定6种工况,建立虚拟样机进行有限元分析,得到其静力学、动力学分析结果。结果表明,设计的换轨车符合要求,其三节臂腹板是应力危险位置,且容易失稳。今后对于类似换轨机械考虑动载时可以取不小于1.2的动载系数。     

半解析有限元法求解钢轨中超声导波频散曲线

钢轨中超声导波的频散曲线是采用超声导波技术进行无缝线路钢轨完整性检测的重要参考依据.通过传统的有限元模态分析方法,无法求解得到钢轨中超声导波完整的频散曲线,针对这一问题,采用了半解析有限元方法.求解时假设导波在钢轨中以简谐振动的方式传播,仅对钢轨的横截面采用三角形单元进行有限元网格划分,经理论推导得到超声导波在钢轨中传播的波动方程,通过求解特征方程,得到波数与频率的值,进而获取频率与相速度、群速度的关系,绘制出频散曲线.通过求解得到的特征向量还可以分析各导波模态的振动特性.实验结果表明,半解析有限元法求解得到的我国无缝线路CHN60钢轨的频散曲线与实际线路测试结果有很好的一致性.     

Temperature in a twin-disc wheel/rail contact simulation

Temperature in a machine element contact is critical in determining wear mechanisms and the conditions at which wear transitions occur. Calculations have shown that the temperature in a wheel/rail contact under severe contact conditions may lead to a transition from severe wear to catastrophic wear. Such high lateral loads and slips can occur in wheel flange contact at railway track curves.The aim of this work was to use a thermal camera to measure the temperatures in a twin-disc simulation of a wheel/rail contact. Disc body and contact temperatures were studied for a number of different contact conditions. Disc emissivity values were determined using an independent calibration test.Measured temperatures were compared with those derived using analytical models which equate frictional heat generated in the contact with heat dissipation due to conduction, convection and radiation. Good correlation was found between the experimental and analytical results. This is despite the fact that its emissivity values were assumed constant throughout the test.     

Periodic microslip between a rolling wheel and a corrugated rail

Methods are presented for calculating the dissipation of frictional energy between a rolling wheel and a sinusoidally corrugated rail which is flexible in the vertical plane. In the absence of dynamic flexibility of the track in the plane of the contact it is found that the frictional dissipation is greatest when a wheel is on the ascending flank of a corrugation and that the amplitude of dissipation decreases continuously with corrugation wave-length. No mechanism which would cause corrugation of railway rails is revealed.     

轿车轮毂过盈装配的有限元分析

通过对过盈装配的有限元分析,研究接触单元在过盈连接中的作用。建立轮毂装配的仿真模型,用ANSYS的接触单元对轮毂的过盈装配的应力情况进行了分析。并通过对材料进行弹塑性设置来模拟轮毂的位移和应力的变化,过盈连接的仿真分析为轮毂的前期设计提供指导意义。     

Optical control of the radius of a wheel rolling on a rail

An optical method for measuring the geometric radius and velocity of slip of a wheel rolling on a rail is discussed.     

Non-linear three-dimensional finite element analysis of a cementless hip endoprosthesis

In this finite element study the stresses between a stem component of a cementless hip endoprosthesis (Young modulus of Co-Cr-Mo) and the human femur were calculated for two different loading types. Linear and non-linear models were used to simulate the interface implant bone. Two models, a stem with a porous coated surface over the entire length and a stem with a porous coated surface in the proximal region were compared regarding the load transmission to the femur. An additional calculation of an 'isoelastic' stem (Young modulus of cortical bone) was done to show the influence of the stem stiffness. A porous coated surface over the entire length causes principal shear stresses up to 2.75 MPa in the distal-medial region during level walking. The highest compressive stresses were calculated in the proximal-lateral region as 1.5 MPa in cancellous bone. A more physiological load transmission is obtained by limiting the coated area to the proximal region. All stresses in the two models are lower than experimentally evaluated strengths in the interface between implant and bone. A strong influence of the Young modulus of the stem material on the interface stresses was found. An 'isoelastic' stem causes compressive stresses in the proximal-lateral region whose values exceed the experimental strength of cancellous bone.     

龙门起重机车轮啃轨故障分析与处理方法

通过分析龙门起重机车轮啃轨故障的危害性及其产生原因，并针对其主要原因提出了相应的改进措施与处理方法。     

压缩机曲轴的有限元分析

为了研究曲轴的动力学特性,利用ANSYS软件的模态分析模块,采用了BLOCK LANCZONS算法对双拐曲轴进行了模态分析,求出了其前6阶固有频率和振型,并且计算出了曲轴的各阶临界转速,为了曲轴的优化设计、制造以及维修都提供了理论指导。     

过盈联接的有限元分析

介绍了过盈联接结构与原理,和传统计算方法。使用ADINA有限元软件对轴孔经常应用的过盈配合联接进行分析,通过有限元的模型建立,有限元单元类型的选择,有限元网格的划分,解题程序的控制和后置处理结果的分析,说明ADINA在过盈联接的分析中是完全适用的及其的精确性。     

盘式制动器的结构场有限元分析

首先探讨盘式制动器在制动过程中的摩擦接触和非线性动力学问题.具体的分析方法包括:摩擦接触算法,非线性有限元方法.按照制动盘与摩擦片的实际几何尺寸,建立了具有速度可变效应的三维瞬态结构应力有限元模型,利用非线性有限元方法,较真实地模拟了制动器的制动过程.通过以上分析得出制动过程的一些结构上的性能变化.将同相同制动条件下的实心盘式制动器和通风盘式制动器对比,得出通风盘式制动器在制动过程中的接触应力,各向位移等.     

Three-dimensional finite element analysis of block compression

Based on rigid-viscoplastic formulation three-dimensional finite element analysis was performed for block compression. Discretization of the variational form of the equilibrium equation is made with 8-node hexahedral isoparametric elements. In the treatment of the traction prescribed boundary condition, velocity dependent friction was used. Simulations of compression of simple rectangular blocks were performed for two geometries under two friction conditions for each geometry. Comparison of some of the computed results with experiments showed excellent agreement.The technique was further extended to take into account the presence of a neutral zone, occurrence of folding and lifting, and applied to the analysis of compression of a wedge-shaped block between two flat parallel dies. Again, the computed results predict the actual characteristics of deformation accurately.