波澜不惊

平静不意味着平淡，看似平凡的外表下，也会有暗潮涌动，蓄势待发，在积聚满能量的那一刻，猛然间激荡出澎湃的热情，每时每刻，我们在生活着，感受着，而下一秒，下一分钟，明天，明年，又会发生什么，谁也无法预知，波澜不惊，正是为了即将展开的波澜壮阔。     

常规由我定

一个传奇的名字，曾经一骑绝尘，如今十年茫茫，塞纳，谱写了划时代的不朽灵魂；一个同样传奇的名字，征战蒙特卡罗，扬威加泰罗尼亚，赛纳，和勒布一道，称雄WRC。名字只是一个符号，当这个符号被赋予了生命，赋予了情感，便成为了一个有血有肉的形象。而这个形象的举手投足，一颦一笑，都会牵引着他的景仰者，无论山高水长，无论荆棘遍野，都将百折不回，一如既往。     

峥嵘时刻 西班牙试驾布加迪威速 Vitesse

眼前一段开阔的高速公路，前后无车，副驾驶上的教练Louis大声冲我喊：“Itstime，Push!”我咬紧牙，一脚油门狠踩下去，双手使劲握紧方向盘。眼看着马力表极速攀升：500，800，1000！这股巨大的力量也作用到我身上，即使有所准备，但还是吓了一跳，前所未有的推背感，感觉午餐的大虾也开始打招呼。脑后传来巨大轰鸣，几秒间，眼前风景没了，极速狭视症开始，些许窒息。余光看了下速度表，怎么才170？猛然想起，对了，这辆车是英里表!此时，油门还远没到底…．     

Volkswagen Variant开启“心”旅程

旅行的目的，不是终点，而是过程。选择一款车，帮你背上行囊，载上家人，逃离城市，远离喧嚣。从出发的那一刻起，一切的烦恼与忧愁，都被留在原地，心情，已经随着大众旅行轿车Variant，一起飞扬。     

借鉴国外“保护”法规 促进我国汽车工业发展

WTO已真正成为世界经济的“联合国”，但其并不剥夺成员国的经济主权，允许采取一定的保护措施，因此，一些国家在限制进口，标准，认证和商检，反倾销，反补贴，价格，费用政策，有针对性地变通国内立法以及在引导国内消费等方面，根据本国的国情制定了许多“保护”政策，技术标准和法规，这些成功的作法，值得我国汽车工业借鉴。     

余音绕梁

有的音乐，如巍巍高山，层峦叠嶂，跌荡起伏；有的音乐，若潺潺流水，轻巧跳荡，如鸣佩环；有的音乐，像苍苍树林，郁郁葱葱，涛声连绵。拂面的微风，清淡的花香，深邃的风景，有的音乐，泛着空灵的回声，余音绕梁，三日不绝。车也如此，当你喜欢它，爱惜它，便能在每时每刻体验到汽车给你带来的享受，时空转换，只要关上车门，天地便尽在手间。     

打开世界 一起腾飞——重庆建设摩托车股份有限公司召开2013年发动机销售年会

一转眼，2013从指间偷偷溜走，转首回望，我们一起走过，有起伏，有变迁，有奋斗的汗水，更有抵达梦想一刻的笑意盎然。猛抬头，2014不经意悄然而至，展望明天，我们携手再出发，抓机遇，迎挑战，协心同力克难关，满怀信心奋力前行谋跨越，建设“芯”动力，开创新天地。     

教科书业陷低潮想方设法寻新路

以前被喻为会生金蛋的教科书业，近年也要面临衰落的命运。1997回归后，香港教育政策经历多次改革，教科书经常改版，令出版成本上升，再加上香港出生率低，杀校缩班，教科书更加难做，有67年历史的龄记，是行内的表表者，其教科书陪伴一代又一代港人成长，然而这个肩负教育使命的老字号，面对教科书业低潮，也要出招应战。     

老杨骑游见闻之南国篇(三)

娥边是彝族自治县城，坐落在一个峡谷地带，大渡河从县城流过。我骑游到此地，望着大渡河，歌曲“英雄抢渡大渡河”的旋律顿时在心中奏响，令人心潮澎湃，振奋向前。翻滚的流水，从桥墩处击来一卷卷浪花，不一会儿就冲下去数米，河流的响声，真似暴风骤雨，如有噪声测试的话，比上海外滩中山大道边分贝数还大很多，而且长时间一直如此，初听心绪激动，久之，响声会使你烦噪不安，幸好我与同行住的旅馆房间距河边还有一定距离，否则根本无法入眠。     

徜徉花海 奇瑞瑞虎全能体验营第2季快意之旅

走进四月，忍不住想起林徽因的《人间四月天》：“你是一树一树的花开，是燕在梁间呢喃，你是爱，是暖，是希望，你是人间的四月天!”四月，是生长的季节，是绽放的季节，是出发的季节。2012年4月5日，在明媚的春光里，在和煦的春风里，奇瑞瑞虎全能体验营第2季“快意之旅”车队由安徽芜湖出发，     

Comparison of the optimum designs of center pillar assembly of an auto-body between conventional steel and ahss with a simplified side impact analysis

This study compares the optimum designs of center pillar assembly with advanced high-strength steel (AHSS) to that of conventional steel for crashworthiness and weight reduction in side impacts. A simplified side impact analysis method was used to simulate the crash behavior of the center pillar assembly with efficient computing time. Thickness optimization aims to perform an S-shaped deformation of the center pillar toward the cabin to reduce the injury level of a driver in a crash test. Center pillar members were regarded as an assembly of parts that are fabricated with tailor-welded blanks, and the thickness of each part was selected as a design variable. The thickness variables of parts that have significant effects on the deformation mechanism were extracted as the main design variables for thickness optimization based on the results of a sensitivity analysis with design of experiments. The optimization condition was constructed to induce an S-shaped deformation mode and reduce the weight of the center pillar assembly. An optimum design was obtained after several iterations with response surface methodology (RSM). Optimization was first performed with conventional steel and then with AHSS with the same procedure to optimize the crashworthiness of the center pillar assembly. After thickness optimization, optimum designs were applied to the full vehicle analysis to evaluate the validity of the optimization scheme with the simplified side impact analysis method. Then, the crashworthiness of optimum designs with conventional steel and AHSS were compared using the full vehicle analysis. This comparison demonstrates that AHSS can be more effectively utilized than conventional steel to obtain a lightweight design of an auto-body with enhanced crashworthiness.     

应力波入射充填节理的透射性能研究

为了研究充填节理对不同频率应力波透射性的影响,根据充填节理特性设计了不同厚度和强度的节理模型,并对不同频率应力波正入射岩体节理的问题开展模拟,研究应力波在不同强度和宽度的充填节理条件下的反射和透射规律。结果表明：对于不同强度和厚度的充填节理,随着应力波频率的增加,其透射系数均逐渐减小,充填节理起到过滤高频波的“滤波”作用；随着频率的增加,透射系数逐渐减小,衰减速率先快后慢,并逐渐趋于稳定,且充填节理强度越低、宽度越大,该现象就越明显。     

高速公路建设项目跟踪评价指标体系和方法研究

从项目跟踪评价理论和方法的研究分析入手,结合高速公路建设项目的特点和实施情况,提出高速公路建设项目跟踪评价的概念,参考层次分析法建立递阶层次结构的思路,建立高速公路建设项目的跟踪评价指标体系;采用集值迭代法确定指标权重并用G1法进行验算;然后应用线性模型对高速公路建设实施情况做出综合评价和分析;这种评价使得对项目过程控制建立一种及时的反馈机制成为可能。     

杜仲胶与SBS改性沥青共混试验研究

SBS因存在与沥青相容性的问题,并不能对所有沥青起到很好的改性效果.而构建SBS与沥青反应渠道,增加反应界面,从而改善与沥青相容性,是提高SBS改性沥青性能的有效手段.天然高分子材料杜仲胶具有与SBS相类似的橡塑二重性,与SBS能很好地相容.同时采用溶剂接枝的方法,在杜仲胶上接枝能与沥青氮基反应的官能团马来酸酐,从而形成了符合SBS增容剂要求的接枝杜仲胶.通过对两种品质不同的沥青进行高低温和流变性能试验,进一步验证了接枝杜仲胶是一种性能良好的SBS改性沥青增容剂.     

The role of the contact geometry in wheel-rail impact due to wheel flats

A thorough investigation of wheel-rail impact due to wheel flats is presented, together with a quantitative characterization of the main mechanisms and parameters. A criterion for the speed with respect to contact loss between wheel and rail is derived. In the subcritical speed regime, the magnitude of the impact force is shown to be directly related to the geometry of the flat, whereas in the transcritical speed regime a fictitious or effective flat depth exists, which decreases with the second order of the speed. In this domain, the position of impact shifts towards the end of the flat with increasing speed. The impact force increases with the second order of the speed in the subcritical speed regime and approximately the first order of the speed in the transcritical speed regime. The magnitude of the impact force is inversely proportional to the minimum circumferential curvature of the wheel tread defect in the subcritical speed regime, and to the effective minimum curvature in the transcritical case. The variation with the flat depth is less; the impact varies with the square root of the flat depth. The presented theory is in accordance with measurements reported in the literature and explains characteristic features in them.     

Integrated evasive manoeuvre assist for collision mitigation with oncoming vehicles

Development and deployment of steering based collision avoidance systems are made difficult due to the complexity of dealing with oncoming vehicles during the evasive manoeuvre. A method to mitigate the collision risk with oncoming vehicles during such manoeuvres is presented in this work. A point mass analysis of such a scenario is first done to determine the importance of speed for mitigating the collision risk with the oncoming vehicle. A characteristic parameter was identified, which correlates well with the need to increase or decrease speed, in order to reduce the collision risk. This finding was then verified in experiments using a Volvo XC90 test vehicle. A closed-loop longitudinal acceleration controller for collision mitigation with oncoming vehicles is then presented. The longitudinal control is combined with yaw stability control using control allocation to form an integrated controller. Simulations in CarMaker using a validated XC90 vehicle model and the proposed controller showed consistent reductions in the collision risk with the oncoming vehicle.     

钢管混凝土桁架拱肋抗弯刚度研究

该文针对四肢格构桁式截面钢管混凝土拱肋,考虑影响钢管混凝土桁式拱肋抗弯刚度的多种因素,采用SAP2000程序,通过大量的结构模拟计算,给出各影响因素与挠度的关系,应用拟合的方法得出各影响因素与挠度的关系式,再由挠度与刚度的关系,推导出刚度与各影响因素的拟合关系式,并通过与传统计算理论的分析比较,验证计算钢管混凝土桁式拱肋抗弯刚度计算公式。     

半主动悬架的滑模变结构控制

针对带有电流变液智能阻尼器的半主动汽车悬架模型,运用滑模变结构方法设计了半主动悬架滑模控制器。根据滑模运动方程稳定的Hurwitz判据选择滑模面系数,用指数趋近率改善滑模运动段的动态品质并进一步确定了半主动悬架的实时控制阻尼力。对多种激励信号下隔振质量的响应及半主动悬架系统在系统参数摄动下的鲁棒特性进行了仿真分析。结果表明:变结构控制下半主动悬架系统的隔振效果要远好于最优被动系统,而且对外界扰动有一定的适应性,对系统参数摄动也具有很强的鲁棒性。     

车辆荷载下地基数值模型的边界影响分析

针对有限单元法模拟实际为半无限土体时有限边界分析模型会引起较大误差的缺点,引入黏弹性人工边界结合有限元数值模型以便准确地描述循环动荷载作用下地基的响应问题。分别采用固定边界、黏性边界及黏弹性边界有限元3种方法计算了交通荷载作用下的地基响应。通过与Lamb问题解析解对比分析表明,黏弹性边界有限元数值模型的计算结果与解析解非常吻合,而固定边界、黏性边界数值模型的计算结果存在不合理现象。算例表明研究交通荷载作用下地基响应时,尤其是分析重复交通荷载作用下的残余变形,宜采用黏弹性边界有限元模型。     

Vehicle Models for RTS Applications

A vehicle system dynamics model is presented that captures the essential braking and handling behavior of a passenger car and runs faster than real-time on a 1998 Pentium 233 MHz laptop computer. The simulation code was generated with the AutoSim multibody code generator and linked with C functions that communicate with braking hardware to create a real-time simulation (RTS) with hardware in the loop (HITL). Techniques are described that were used to allow the simulation program to work with HITL. The model (without controller) was also integrated with the Simulink environment to provide a design tool for control engineers.