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应用ANSYS软件,完成了东风EQ140型汽车车架的刚度分析过程。通过建模、加载、解算及后处理等一系列步骤获得车架的扭转变形及应力,揭示出车架横梁在后桥支撑点存在扭转变形最大的问题,为车架的优化设计提供了重要依据。 相似文献
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This paper presents theoretical and numerical study on bending properties of unbonded flexible risers. To capture nonlinearities in layer's sliding, the stress component due to slip-stick behavior is considered and energy conservation principle considering sliding-caused heat consumption is employed in the analytical model. Besides, a finite element model estimating mechanics of unbonded flexible risers' bending is proposed. In the finite element model, couplings between bending moment–curvature and axial stress as well as contact interaction among layers and tendons have been considered. The theoretical and numerical results were validated against the corresponding experimental data in literature and mutually compared in analyzing nonlinear bending behavior of flexible risers. Moreover, the impacts of axisymmetric loads on riser's bending behavior have been further investigated. 相似文献
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《铁道标准设计通讯》2015,(11):131-134
雷击将造成电气化铁路接触网绝缘子闪络,影响供电的可靠性。现有的研究表明,在直供方式中,接触网的绕击耐雷水平远低于其反击耐雷水平,因此架设避雷线有利于提高接触网的整体耐雷水平,减少雷击跳闸率。研究回流线升高兼做避雷线(方案1)与单独架设避雷线(方案2)对接触网防雷效果的影响。研究结果表明,当避雷线位置合适时,两种方案均能对承力索的绕击起到很好的保护作用。单独架设避雷线时,回流线与避雷线共同作用,增大与承力索的耦合系数,并对雷电流起到分流作用,从而提高接触网的感应耐雷水平与反击耐雷水平。因此方案2的感应雷耐受水平与反击雷耐受水平均略高于方案1,但总体投资要大于方案2,现场应根据雷害的严重程度及投资比较,选取合适的方案。 相似文献
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铁路桥梁正常使用极限状态可靠度校准研究 总被引:5,自引:5,他引:0
分别以现行容许应力法规范、试行极限状态法规范和欧洲规范为依据,对某铁路工程预制后张法简支T梁的正截面抗裂性和桥梁刚度进行验算,从而对3种规范在正常使用极限状态下的可靠度进行比较,得出3种情况下的安全储备大小顺序:欧洲规范现行容许应力法规范试行极限状态法规范,并对试行极限状态法规范提出建议。 相似文献
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Sajjad Z. Meymand Alexander Keylin 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2016,54(3):386-428
Accurate and efficient contact models for wheel–rail interaction are essential for the study of the dynamic behaviour of a railway vehicle. Assessment of the contact forces and moments, as well as contact geometry provide a fundamental foundation for such tasks as design of braking and traction control systems, prediction of wheel and rail wear, and evaluation of ride safety and comfort. This paper discusses the evolution and the current state of the theories for solving the wheel–rail contact problem for rolling stock. The well-known theories for modelling both normal contact (Hertzian and non-Hertzian) and tangential contact (Kalker's linear theory, FASTSIM, CONTACT, Polach's theory, etc.) are reviewed. The paper discusses the simplifying assumptions for developing these models and compares their functionality. The experimental studies for evaluation of contact models are also reviewed. This paper concludes with discussing open areas in contact mechanics that require further research for developing better models to represent the wheel–rail interaction. 相似文献
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In his extensive career, Joost Kalker worked on many contact phenomena. For this, he developed various theories, which were accompanied by algorithms and computer programs. Most notably, these are the FASTSIM algorithm for quickly evaluating the nonlinear creep-force law in vehicle dynamic simulations, the CONTACT program for the exact theory of rolling contact in 3D elastic halfspaces, and the USETAB program that uses a large table calculated with CONTACT, in order to improve over the FASTSIM algorithm in speed, accuracy and versatility as well. 相似文献
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