微型电动车轮毂电机的磁热耦合分析

针对温度变化对微型电动车轮毂电机工作性能和使用寿命的影响,提出了一种磁热耦合分析方法,并对轮毂电机进行了磁场和热场分析.采用Ansoft Maxwell软件建立了轮毂电机的有限元仿真模型,并通过仿真获得了其内部复杂磁通密度云图和磁力线分布图.建立了湿度场的数学模型,计算了绕组损耗、定转子铁损和永磁体的涡流损耗,并以此耦合到温度场作为热源.采用Ansys Workbench软件,计算了轮毂电机稳态温度场和各部件的温度分布以及起动过程中定子铁芯与转子铁芯瞬态温度曲线.仿真结果与试验实测温度值基本一致,表明采用磁热耦合方法分析轮毂电机的热源分布与温度分布准确可行,可为今后的轮毂电机优化设计提供基础.     

基于免疫遗传算法的发动机悬置系统优化与鲁棒性分析

在了解各种优化方法优缺点的基础上,建立发动机悬置系统数学模型。选用免疫遗传算法对某型客车发动机的悬置刚度参数进行优化,并用Monte Carlo法对悬置系统进行鲁棒性分析。结果表明,优化解不仅能保证6自由度方向的高解耦率,还能保证悬置系统的鲁棒性。     

郑州市京广北路隧道设计综述

郑州市京广北路隧道是京广快速路系统的重要组成部分,主要介绍了工程基坑支护、主体结构及运营系统设计,总结了工程设计的特点,可为类似项目设计提供借鉴。     

Application of warm forming aluminum alloy parts for automotive body based on impact

Aluminum alloys are important technological materials for the application on lightweight design and development of vehicle body. The research works for characterizing warm forming behavior of aluminum alloys have generally reported. However, there were few researches focused on the flow behavior of warm forming aluminum alloy parts for the energy absorbing performance during crash. The tensile stress-strain response for warm forming AA5182 specimens tested under the strain rates of 0.0015 s^?1, 0.015 s^?1, 0.15 s^?1 and 1.5 s^?1 are presented in this paper. The data were fit to the Johnson-Cook constitutive model for the simulation of frontal impact. The energy absorbing performance of warm forming AA5182 parts were analyzed. The results show the higher flow stresses and lower fractured strain of warm forming aluminum alloy parts with the strain rate increasing. The flow stresses of warm forming aluminum alloy parts are insensitive to strain rate, while the fractured strain and elongation are sensitive to strain rate. The intrusion displacement of the warm forming aluminum alloy parts is appropriate for the satisfaction of vehicle body design avoiding the excessive deformation for the injury of passenger or the failure of frontal door opening. The feasibility of warm forming aluminum alloy parts is verified with the analysis of energy absorbing performance, stiffness and modal of vehicle body.     

中国市场SUV动力类型现状及趋势研究

<正>面对日益严峻的能源短缺和环境危机,国家对于乘用车能耗和排放的要求更加严格,2015年,企业乘用车新车平均燃料消耗量将降至每百公里6.9L。在如此形势下,作为传统油耗大户的SUV车型,其动力类型该怎样改变,关系到车企乃至整个产业的健康发展。     

一种中分自卸汽车列车控制系统的设计

本论文介绍了一种可实现多卸货次序的中分自卸汽车列车,它通过电控气、气控液的方式分别控制汽车列车两货箱侧箱板开启、底板中部突起进行卸货,前、后箱卸货次序不受限制,避免了传统自卸车对车厢长度要求高、稳定性差、对卸货场地要求严格、无法加装全挂列车等缺点,使货物堆放更到位,避免二次转运造成的资源浪费,提高了卸货效率。     

Modeling oil spills in a river—lake system

A general model shell, ROSS3, is developed for simulating oil spills in complex river systems using techniques which have not been previously exploited in oil spill models. ROSS3's new approach has several advantages over the approach to model oil spills in the past: (a) The use of a time-varying boundary-fitted coordinate system that allows accurate accounting for complex river/lake boundary as well as the river boundary changes as its water levels fluctuate; (b) The ability to confine two-dimensional hydrodynamic computations to a limited river reach; (c) The ability to interactively layout the channel networks for setting up the model, define extra cross sections to increase the accuracy if needed, in addition to the traditional data entry and visualization interfaces.ROSS3 is a two-layer two-dimensional oip spill model that can simulate the mechanism of advection, horizontal diffusion, mechanical spreading, shoreline deposition, evaporation, dissolution, vertical mixing, resurfacing and sinking. In ROSS3 spilled oil may be a surface slick or suspended oil droplets, or a combination of both. Both free surface and ice cover conditions can be simulated. The flow of conditions can be varied and the unsteady flow model can be run within ROSS3 to simulate the flow conditions in both the river and the lake. The ice conditions can be added or removed from the model input using easy interactive procedures.     

Fuzzy子群和拟Fuzzy正规子群

给出了Fuzzy子群的一种等价定义，利用这种定义讨论了Fuzzy子群的截集，强截集，水平截集之间的关系，同时讨论了Fuzzy正规子群的一些性质，并给出了拟Fuzzy正规子群的概念，在讨论中发现，在某些方面拟Fuzzy正规子群可以代替Fuzzy正规子群。     

试验数据统计建模研究

针对数据融合技术和仿真试验的难点，对试验数据的建模问题作了分析研究，简要介绍试验数据建模的成果。     

Hybrid Simulation of Dynamics for the Pantograph-Catenary System

Summary In order to examine the static and dynamic behavior of the pantograph-catenary system, a special teat facility is established and described in this paper. Since the catenary is difficult to be modeled by a hardware teat facility indoor, a mixed theoretical-experimental technique is introduced, in which the pantograph is an actual one but the catenary is just an input of a mathematical model. Bayed on setting up the hybrid simulation teat device of the pantograph-catenary system, the dynamic behavior of the system under overhead equipment with variant parameters is analyzed for different speed. The effect of the presag and the surface irregularities of contact wire on current-collection has been studied.