Vehicle lift-off modelling and a new rollover detection criterion

The modelling and development of a general criterion for the prediction of rollover threshold is the main purpose of this work. Vehicle dynamics models after the wheels lift-off and when the vehicle moves on the two wheels are derived and the governing equations are used to develop the rollover threshold. These models include the properties of the suspension and steering systems. In order to study the stability of motion, the steady-state solutions of the equations of motion are carried out. Based on the stability analyses, a new relation is obtained for the rollover threshold in terms of measurable response parameters. The presented criterion predicts the best time for the prevention of the vehicle rollover by applying a correcting moment. It is shown that the introduced threshold of vehicle rollover is a proper state of vehicle motion that is best for stabilising the vehicle with a low energy requirement.     

航海专业大学生体育锻炼意识与运动兴趣的调查研究

采用问卷调查、文献资料、数理统计等方法,针对目前我国航海专业大学生体育健康教育现状,进行了体育锻炼意识、健康状况、体育运动兴趣等方面的调查研究,针对存在问题,分析原因并提出相应的建议.     

基于RAMSIS的轿跑车视野分析

介绍了汽车视野分析的基本方法,并基于RAMSIS软件对某轿跑车视野进行了分析,分析内容主要包括仪表板盲区校核、A柱盲区校核、内外后视镜视野校核等,为同类车型的视野分析提供了参考依据。     

高校三、四年级女大学生课外体育锻炼现状与分析

通过问卷调查、文献资料等方法对江西高校三、四年级女生参加课外体育锻炼现状及影响参加的课外体育活动开展的一系列因素进行调查分析,并针对存在问题提出意见及建议.     

江西省青少年阳光体育运动开展现状与分析

切实推进江西省青少年阳光体育运动的广泛开展,依据三部委对开展阳光体育运动的相关要求,通过对江西省29所各类学校阳光体育运动开展现状的问卷及实地走访调查。结果发现:小学阶段及地处乡镇学校的青少年对阳光体育运动开展认知程度较低;在29所学校中仅有12.7%青少年能够保证每天参加一小时的锻炼,70%左右的青少年没有达到掌握两项体育技能的基本要求;部分学校开展阳光体育运动的相关激励、评价等制度不健全,有待完善。建议有关部门和学校采取积极有效地措施进一步推进阳光体育运动的开展。     

三菱越野汽车微机控制的排放控制系统的检修

介绍了 2 0 0 1款三菱帕杰罗 (PAJERO)V73型越野汽车燃油蒸发排放控制 (EVAP)、废气再循环 (EGR)以及空燃比闭环控制等排放控制系统的故障诊断与检修方法。     

AL4自动变速器电控系统

简述AL4自动变速器电控系统电路及工作过程,介绍电控部件的电气参数及故障诊断。     

青岛建设国际集装箱中转港的战略思考与措施

依据我国撑杆跳高项目现有训练水平,将撑杆跳高与其他田径跳跃及体操项目特征作以比较,认为撑杆跳高不仅反映出体能类项群的特征,而更多反映出技能类项目的本质属性,并提出借鉴技能类项群的训练理论和方法,重新规划我国撑竿跳高项目的训练方向。     

A driver-adaptive stability control strategy for sport utility vehicles

Conventional vehicle stability control (VSC) systems are designed for average drivers. For a driver with a good driving skill, the VSC systems may be redundant; for a driver with a poor driving skill, the VSC intervention may be inadequate. To increase safety of sport utility vehicles (SUVs), this paper proposes a novel driver-adaptive VSC (DAVSC) strategy based on scaling the target yaw rate commanded by the driver. The DAVSC system is adaptive to drivers’ driving skills. More control effort would be exerted for drivers with poor driving skills, and vice versa. A sliding mode control (SMC)-based differential braking (DB) controller is designed using a three degrees of freedom (DOF) yaw-plane model. An eight DOF nonlinear yaw-roll model is used to simulate the SUV dynamics. Two driver models, namely longitudinal and lateral, are used to ‘drive’ the virtual SUV. By integrating the virtual SUV, the DB controller, and the driver models, the performance of the DAVSC system is investigated. The simulations demonstrate the effectiveness of the DAVSC strategy.     

某SUV底盘空气动力性能优化研究

汽车底盘空气动力性能优化对降低整车空气阻力和升力有重要影响,针对底盘区域进行空气动力性能优化设计是提升整车动力经济性的重要途径。针对某款运动型多用途汽车（Sport Utility Vehicle,SUV）开展整车外流场计算流体动力学（Computational Fluid Dynamics,CFD）仿真分析,对比了Realizable k-ε和SST k-ω两种湍流模型仿真精度,选用Realizable k-ε湍流模型进行底盘空气动力学方案设计。结合该SUV底盘特征及仿真流场分析结果,在尽可能降低整车成本的前提下,设计前保险杠下部阻风板、前轮挡板斜梯、副车架后部导流板、底盘中部护板以及尾部消音器造型优化共5种空气动力学方案,并进行了实车风洞试验验证。结果表明,5种方案对整车空气阻力性能提升均有不同程度的贡献,其中尾部消音器造型优化减阻效果明显,实车空气阻力系数降低2.99%;综合采用5种底盘空气动力学方案后空气阻力系数共降低5.16%,升力系数降低21.00%,有效实现节能降阻,并有助于提高整车行驶稳定性。