A Novel Approach to Vehicle Dynamics using the Theory of a Cosserat Point and its Application to Collision Analyses of Platooning Vehicles

A fully three-dimensional, computationally inexpensive vehicular model is presented. In contrast to traditional rigid body models, the vehicle's sprung mass is modeled as a (nonlinearly) deformable body. The formulation of the equations of motion is based on a continuum theory known as the theory of a Cosserat point. These equations largely preserve the relative simplicity of rigid body dynamics but incorporate deformable features. The ease of computer implementation permits the simultaneous simulation of vehicle and collision dynamics of multiple vehicles and highway objects. In this paper, the theory of a Cosserat point is summarized and its general application to vehicle and collision dynamics is illustrated. A three-dimensional collision algorithm is discussed with emphasis on small closing velocities (negligible residual crush, elastic rebound). The novel model is compared to standard procedures.     

Geometric-based tyre vertical force estimation and stiffness parameterisation for automotive and unmanned vehicle applications

Advanced empirical, and physical-based tyre models have proven to be accurate for simulating tyre dynamics; however, these tyre models typically require expensive and intensive tyre parameterisation. Recent research into wheeled unmanned ground vehicles requiring vertical force analysis has shown good results using a simple linear spring model for the tyre which demonstrate the continued use for simple tyre models; however, parameterisation of the tyre still remains a challenge when load test equipment is not available. This paper presents a cost-effective tyre vertical stiffness parameterisation procedure using only measured tyre geometry and air pressure for applications where high-fidelity tyre models are unnecessary. Vertical forces calculated through an air volume optimisation approach are used to estimate tyre vertical stiffness. Nine tyres from the literature are compared to evaluate the performance of the vertical force estimation and stiffness parameterisation algorithms. Experimental results on a pair of ATV tyres are also presented.     

ATV与MATV技术在轿车乘坐室噪声分析中的应用

阐述了声传递向量（ATV）和模态声传递向量（MATV）技术的基本概念及其与传统边界元方法（BEM）的区别，并通过实例介绍YATV和MATV技术在车身结构模态声学贡献量分析和车身板件声学贡献量分析中的应用。     

全地形车企业产品开发与市场开拓建议

目前我国全地形车行业面临新的机遇和挑战,产品开发与市场开拓工作对企业的发展起着关键作用.为了行业的健康发展,一方面,政府部门和行业机构应不断研究新情况,对产业进行正确引导;另一方面,各企业特别是行业骨干企业,应当重视对行业发展的研究,实施各自的产品开发与市场开拓战略.     

液压分配阀在全地形车制动系统中的应用

在全地形车制动系统中采用了液压分配阀设计,通过试验及相关验算,该设计简化了制动管路,可方便调整前后轮制动力分配系数,满足全地形车的制动要求,为全地形车制动系统的设计提供了一种新的思路。然而,该设计也存在主泵负担加重、管路压强加大等不利因素,在设计过程中应加以注意和风险防范。     

基于公共直流母线的挖泥船绞车变频控制系统

通过对基于公共直流母线的多变频器系统构成和功能等的描述，介绍了多变频器系统在绞吸吹式挖泥船上对6组绞车进行协同运行控制的应用。每个变频器对应驱动一个绞车电机，在运用中每个变频器都有电动和发电两种工作状态，公共直流母线系统充分发挥了能量互馈的特点，使得系统工作可靠性高，冗余性好，能完成高性能的多组绞车联动协同控制，并具有发热量小、节能性好等特点。     

ATV车架焊接工艺流程分析

ATV车架焊接的好坏与车架材料、工装固定、焊丝种类、焊接电流和焊接顺序等密切相关,焊接前可结合CAE分析和残余应力分布的预判来确定车架材料及焊接顺序;在进行跑车试验前,先检查焊接质量,如焊接接头所包括的焊缝、熔合区和热影响区等,以设定整个工艺流程;用材料试验法对关键点的焊接接头进行检查,可对焊接工艺给出合理判断.     

全地形车专利态势分析及专利申请建议

关于ATV的各项技术日益受到行业内相关人士的关注,笔者以中国专利数据库(CPRS)中2012年12月31日以前公开的ATV的专利文献作为样本,对全地形车专利态势进行分析并对专利申请提出建议。