越野汽车的机动性研究

研究了越野汽车机动性及其影响因素,并且基于越野汽车机动性模型对车辆进行评定。根据研究结论,对某两款越野汽车进行分析,得出其为真正意义上的高机动性越野汽车。     

半开放式差速器的技术优势及实践应用探讨

差速器提供了自由的转速差满足车辆的行驶需要,然而却在特殊路况下导致了车轮空转车辆停滞。差速锁介入消除了转速差,解决了这一特殊情况的同时却带来了其他问题。差速器不限制的转速差超出使用要求,差速锁直接砍掉全部转速差。差速器与差速锁,本身就是矛盾对立的二者,汽车总是在二者之间艰难的取舍。其实我们并不需要差速锁,只需差速器保留正常行驶所需要的转速比的即可,我们将之命名为:半开放式差速器。基于机械控制式的、结构简单的、功能可开可关的半开放式差速器已经实现了技术突破并试验成功,也取得了相关发明专利,故在本文中研究讨论。     

An investigation into the effect of suspension configurations on the performance of tracked vehicles traversing bump terrains

This is a theoretical investigation into the effect of various suspension configurations on a tracked vehicle performance over bump terrains. The model developed is validated using published experimental data of the modal characteristics of the vehicle. The desired performance is based on ride comfort via the mixed objective function (MOF), which combines the crest factor of bounce acceleration, bounce displacement, angular acceleration, and pitch angle. The optimisation process involves evaluating the MOF for different numbers and locations of dampers and under different rigid bump road conditions and speeds. The system responses of the selected suspension configurations in the time and frequency domains are compared against the undamped suspension. The results show that the suspension configurations have a significant effect on the vehicle mobility over bump road profiles. For a five-road–wheel half model of a tracked vehicle, the maximum number of dampers to use for ride comfort over these road bumps is three with the dampers located at wheel positions 1, 2 and 5. This confirms the current practice for many tracked vehicles with 10 road wheels. However, it is further shown that the suspension fitted with two dampers at the extreme road wheels offer the best performance over various rigid bump terrains.     

重型越野汽车轻量化车轮设计开发

本文根据铝合金车轮在重型越野汽车上的工程应用,及其加工工艺,设计了铝合金车轮的结构型式及特性参数。并以ANSYS软件为工具,对越野汽车车轮进行受力分析,详细准确地确定了车轮的受力情况和应力分布部位,依托分析结果对车轮进行优化,达到降低车轮关键部位应力的目的。并通过实际装车试验验证,结果显示该重型越野汽车轻量化车轮产品设计的合理性、可靠性,解决了车辆轻量化的问题,提高了整车的质量利用系数。     

日本三菱6G72型发动机的故障诊断

日本三菱MONTERO（蒙特罗）SPORT LS越野汽车装配6G72型汽油机（V6，3．0L多点汽油喷射），该机带有ECM（发动机电脑控制和诊断）系统，当发动机出现故障时，首先应对其进行基本检查，然后提取故障代码，按代码表指示的部位进行检查与诊断。对无代码的故障，按故障症状进行诊断。     

越野汽车挡位决策的自适应模糊控制

为提高装备自动变速器的越野汽车换挡控制系统对复杂路况的自适应能力,在基本模糊控制模块基础上,建立了具有两级递阶结构的越野车自适应模糊换挡控制系统.基本模糊控制模块将油门开度、车速和加速度3参数进行模糊化和模糊推理,实现挡位决策;自适应控制模块按照检测的车速和加速度对直线行驶阻力和附着力进行在线辨识,并由此进行量化因子的自调整.仿真结果表明所设计的模糊控制系统具有良好的自适应能力.     

越野赛车前碰撞特性仿真分析

针对越野赛车车架的强度和刚度的合理匹配问题，利用ANSYS软件建立了美国某Mini-Baja越野赛车前碰撞的有限元模型，模拟该车在乡村路面上以48km／h的速度撞树的情况，得到了碰撞过程中前横梁的位移、速度随时间变化曲线及整车应力分布图．模拟结果表明：该车车架材料的强度和刚度达到了美国FMVSS203安全法规的要求；采用有限元软件ANSYS对小型越野赛车进行碰撞分析，为材料强度和刚度的选择提供了有效的手段．     

Human Impacts on Cable Beach,Broome (Western Australia)

There are concerns that Cable Beach, which is of outstanding natural beauty and a major tourist attraction for Broome and the Kimberley region of northwest Australia, is suffering damage from recreational use, particularly that caused by off-road vehicles. To assess current levels of human impact on the shore and its fauna, the southern-most kilometer of the Beach, covering an area to which vehicles had access and an adjacent area closed to vehicles, was surveyed for human usage and shore crab abundance. Human usage over the recording period was high in the area with high vehicular access. The amount of litter, although considerable, was well below that recorded in some other tourist destinations elsewhere in the world. Burrows of both the ghost crabs Ocypode spp, and the sand bubbler, Scopimera inflata, were less numerous in areas of high vehicle use than those of low use. Both species may be valuable in monitoring human impacts on Cable Beach.     

关于非道路宽体自卸车“来油慢”相关问题分析及解决方案

随着《GB 20891-2014 非道路移动机械用柴油机排气污染物排放限值及测量方法(中国第三、四阶段)》的推出,原有大泵发动机逐渐被高压共轨发动机淘汰。在切换过程中,司机们纷纷表示高压共轨发动机没有大泵发动机有劲,然而通过比较各发动机公司提供的发动机性能数据单发现,高压共轨发动机的输出扭矩较大泵发动机的输出扭矩更大。通过进一步调研发现,司机反馈的现象为"起步没劲"、"起步来油慢",本文将以搭载潍柴发动机WP12G460E310发动机的徐工非道路宽体自卸车为试验及分析对象,全面解析"来油慢"问题并提出解决方案。通过实验对比发现,加大排气管直径并取消消音器可解决"来油慢"问题,且效果明显。     

轻型越野车车轮定位与悬架的相互影响

分析了轻型越野车采用悬架系统相应的车轮定位特性,通过对侧倾中心和车身侧倾角的分析,得出了车轮定位与悬架相互影响的工程理论研究方法,并通过ADAMS仿真分析和道路试验给予了验证。