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在任意拉格朗日-欧拉框架下,利用三维粘性非定常不可压缩N-S方程,k-ε两方程紊流模型,采用有限体积法建立了横风作用下列车周围空气流场的数值计算模型,运用车辆-轨道耦合动力学,分析了横风环境下风-车耦合振动响应。结果表明:与无横风作用时相比较,横风作用下,背风侧的脱轨系数和轮轨作用力有所增加,轮重减载率减小,迎风侧的脱轨系数和轮轨横向力有所减小,轮重减载率增加。相对于脱轨系数,轮重减载率对横风作用更为敏感。Abstract: Based upon an arbitrary Lagrangian-Eulerian scheme,the Finite Volume Method (FVM) was applied to the computation of the unsteady three-dimensional incompressible wind field around the train in cross-winds,in which the standard k-ε turbulence model was adopted. Combined with the vehicle-track coupling dynamics,analysis was carried on wind-vehicle coupling vibration in cross winds. Compared with the simulation without wind forces,in cross winds the derailment coefficient and the wheel/rail contact force of the leeward side are increased,and the wheel-load reduction coefficient is decreased; while the derailment coefficient and the wheel/rail contact force of the windward side are decreased,and the wheel-load reduction coefficient is increased. The wheel-load reduction coefficient is more sensitive to the cross wind load compared with the derailment coefficient. 相似文献
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杨吉忠 《中国新技术新产品精选》2013,(5):38-39
本文结合某地区工程地质勘察与水文地质条件之关系进行了探讨,在工程地质勘察中不仅要查明与岩土工程有关的水文地质问题,评价地下水对岩土体或建(构)筑物的作用与影响,更要提出预防与治理措施的建议,为设计、施工提供必要的水文地质资料,以减少或消除因水文地质问题而带来的危害。 相似文献
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凤岩山铅锌钢多金属矿位于兰坪断陷盆地中部,是云南省乃至全国重要的铅锌成矿区之一,具有良好的成矿条件和找矿前景。本文通过对矿区地质背景条件、地质特征、地球化学异常特征、矿体特征、矿石特征的分析,推断矿床成因为后期热卤水为主改造叠加形成,属沉积一改造层控型矿床。 相似文献
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