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通过对非独立悬架中钢板弹簧在整车状态下的运动轨迹的分析,阐述了对称式钢板板簧、非对称式钢板弹簧运动轨迹作图法。运用中心拓展作图法,在CATIA模块中以草图绘制为基础,对板簧和轮心轨迹进行绘制。通过DMU运动仿真模块来模拟板簧的运动方式,对对称和非对称式钢板弹簧运动轨迹进行运动仿真。运用ADAMS方法,根据非独立悬架运动学原理,以模型的空间位置为基础,在整车坐标系下得到了钢板弹簧运动轨迹。通过中心拓展作图法与ADAMS方法对比分析,验证了该方法设计的板簧在轮边、后桥、传动轴等跳动校核中的有效性。 相似文献
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以襄渝线水西沟隧道为例,介绍了电气化铁路既有隧道的加固原理及技术要求,可为今后类似工程施工提供一定的参考与借鉴。 相似文献
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In order to assess temperature field in microwave heating for recycling asphalt pavements,a 2D mathematic heat transfer model was developed based on Fourier heat transfer theory The microwave internal heat?generation was researched by using surface field of pyramidal horn replacing approximate radiation field In addition,the boundary conditions were built and normalization processing was implemented The control volume based finite differential method (CV-BDM) was used to establish the implicit discrete scheme of the conservation
equations,and the numerical value simulation was employed By continuous or intermittent
radiation heating technique,a microwave heating experimental system at 2 145 GHz was carried out to investigate temperature variation characteristics of asphalt pavements along with heating time The result shows that (1) the increase of temperature of asphalt mixture during microwave heating is obviously nonlinear,the temperature rises slowly in the initial stage of the heating but increases rapidly in the late heating period; (2) the temperature distribution is non-uniform that the temperature in central area of the surface is higher while it is lower on edge; (3) the uniformity of temperature within asphalt mixtures can be improved by using intermittent heating technique,and the heating time must be reasonable The simulation results are in preferable agreement with the experiment 相似文献
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通过对轻轨车辆用制动闸片产品结构设计、配方筛选、工艺路线设计和产品性能对比试验等进行国产化研究,试制出符合设计要求的国产闸片,通过近2万km的装车运用考核证明,国产制动闸片具有优良的综合性能,可替代进口闸片。 相似文献
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