排序方式: 共有62条查询结果,搜索用时 500 毫秒
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以乘客需求为导向的城市公交服务设计导则 总被引:1,自引:0,他引:1
针对城市政府如何在有限的财政投入下,根据社会经济发展水平向乘客提供所需公交服务的问题,提出应以乘客需求为导向,制定一部城市公交服务设计导则。借鉴国外相关经验,探讨导则制订过程的4个层级,即总目标、分目标、指标和细则。针对武汉市公交服务设计导则的制订,以公交线网结构、公交服务水平、公交车辆最高乘载率、公交车辆生产力、公交服务可靠性、公交运输系统角色几个分目标为例,分别讨论了其对应指标和细则的具体内容。 相似文献
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An Investigation into Regenerative Braking Control Strategy for Hybrid Electric Vehicle 总被引:1,自引:1,他引:0
PENG Dong 《上海交通大学学报(英文版)》2005,10(4):407-412
Energy regeneration during braking is an important technique for hybrid electric vehicle (HEV) to improve their fuel economy and extend their driving range. Due to the effect of regenerative braking torque which is added by electric motor, the braking torque distribution between front and rear axles should be changed and the control logic of anti-lock braking system (ABS) ought to be adjusted according to the regenerative braking torque. This paper put forward a braking control strategy for hybrid electric vehicle; the control strategy is implemented with eight DOFs (Degree-of-Freedom) nonlinear vehicle forward simulation model which is built under the environment of Matlab/Simulink. Based on target wheel slip ratio, a fuzzy logic approach was applied to maintain the optimal target slip ratio so that best compromise between hydraulic torque and regenerative torque can be obtained for the vehicle. 相似文献
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高速轮轨列车制动盘热应力有限元研究 总被引:10,自引:0,他引:10
盘式摩擦制动器在高速轮轨列车上有着广泛的应用。但该制动器在制动过程中因制动盘温度的急剧上升,将使制动性能降低,甚至有可能导致制动盘失效,因此制动盘温度和应力分布对制动盘的寿命及制动性能有着重大影响。本文采用有限元方法对高速轮轨列车制动盘的瞬态温度场和热应力进行了分析研究。根据制动盘制动原理和传热原理,确定了温度场和热应力有限元分析中的载荷、边界条件、加载过程和模拟工况,通过对蠕铁、25Cr2Mo1V和35CrMo 3种制动盘材料在相同结构、相同制动过程条件下的热应力分析,对不同材料制动盘热应力的影响进行了考查和热特性的分析对比,为制动盘的设计和优化提供了依据。 相似文献
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