体验长途行车加油难

"五一"期间,笔者所在单位组织员工自备车辆到洛阳、开封、焦作等地旅游.此前对限量加油早有所闻,但未曾亲历感受.通过本次远距离行车,感受颇多.     

货车折了一条"腿"砸歪公交一张"嘴"

8月21日下午,在浙江省温岭市泽坎线城东街道新开河路段,一辆行驶着的大货车前轮胎突然飞出,引发了两起交通事故,幸好无人员伤亡.     

自卸汽车侧翻事故分析实例

事故经过: 某单位一台矿内运输自卸汽车在存矿场进行卸载作业时发生倾倒事故,所幸侧翻时速度较慢,驾驶员反应灵敏,及时采取了自我防护措施,没有受伤,只是受了惊吓.车辆损失较大,两块蓄电池壳体破碎,燃油箱破裂造成燃油泄漏,举升油缸活塞杆轻度弯曲,举升油缸底座与车架连接处断裂.     

Application of a thermodynamic model with a complex chemistry to a cycle resolved knock prediction on a spark ignition optical engine

A combination of experimental and numerical methodologies is proposed for the investigation of knocking in spark ignition engines to aid in better understanding the physical and chemical processes that occur and to exploit the capabilities of a developed computational tool. The latter consists of a thermo-fluid dynamics model, which is part of an advanced 1-D fluid dynamics code for the simulation of the entire engine, and a complex chemistry model, which can be embedded into the thermo-fluid dynamics model using the same integration algorithm for the conservation equations and the reacting species. Their mutual interaction in the energy balance will be considered. The experimental activity was carried out in the combustion chamber of an optically accessible, single-cylinder P.F.I. engine equipped with a commercial head. The experimental data consisted of optical measurements correlated to the combustion and auto-ignition processes within the cylinder. The optical measurements were based on 2-D digital imaging, UV visible natural emission spectroscopy and the chemiluminescence of radical species (OH and HCO). The engine parameters, the pressure signals of the related data and optical acquisition are compared on an individual cycle basis in the simulation by running the engine at a constant speed and varying the spark advance from normal combustion to heavy knock conditions.     

一起货车与轿车侧面恶性擦撞事故的分析

介绍了一起货车与轿车侧面恶性擦撞事故的损伤情况，分析了两车相撞的部位、相撞前的相对速度及事故原因。     

体验长途行车加油难

“五一”期间，笔者所在单位组织员工自备车辆到洛阳、开封、焦作等地旅游。此前对限量加油早有所闻，但未曾亲历感受。通过本次远距离行车，感受颇多。发车之前，在单位内将客车燃油箱加注满燃油（单位配有自用油库），燃油箱约容纳220L柴油，由于该车型为单位通勤客车，所以只配备单燃油箱（旅游客车一般配置双燃油箱），这也成为本次旅行中的一大缺憾。     

一种矿用车专用变速器设计

结合矿用车工况,提出矿用车变速器的开发要求,作为设计开发输入,据此设计了一种专用车变速器,并详细介绍了该变速器的结构和工作原理。     

Using a surrogate safety approach to prioritize hazardous segments in a rural highway in a developing country

Road safety is a global concern particularly in developing countries where some road sections are disproportionately more vulnerable in terms of the frequency and severity of crashes. Other than using historical crash data based reactive approaches, those sections need to be identified proactively, so that mitigation measures can be applied. Moreover, those approaches are sometimes questioned mainly due to data reliability issues in developing countries. The study reported here is aimed at highlighting the applicability of traffic conflict techniques as surrogate safety measures to identify those sections of a rural highway in a developing country, which are most likely at risk. An adapted framework is demonstrated to identify traffic conflicts using combined surrogate indicators acknowledging the limited resources and facilities in developing countries. A new model is put forwarded using a count data modelling approach. Both fixed and random parameters model derivatives have been explored as an alternative methodological approach to relate the factors affecting the number and probability of conflicts. The partial effects of individual independent variables were estimated to gain a better insight of their impact. The results show that the model can predict high risk segments in terms of probability of conflicts as well as safety risk, as well as prioritize road sections according to the likelihood of their safety level. The model provides a less expensive alternative to the collection of historical crash data in order to identify hazardous road locations or black spots on two-lane highways in developing countries.¹     

一种用汽油燃烧系统模拟发动机台架催化剂热老化的方法

采用通用汽车公司的快速老化程序RAT-A，分别在FOCAS燃烧系统及发动机上对催化剂在老化前和老化后的性能进行对比试验。结果表明，FOCAS燃烧系统能够对催化剂进行和发动机类似的老化。与发动机台架试验相比，FOCAS系统有明显的优点，如严格地控制空燃比使其变化幅度很小、空燃比稳定运行的范围宽、活动部件少及易操作等。     

浅谈工程低价中标现象

通过对低价竞标现象的成因及危害的分析,提出了合理低价中标的观点。同时对低价中标工程的管理提出了自己的建议。     

可得利益损失属于违约赔偿范围——江苏省海安县法院判决一起运输合同纠纷案

当事人一方不履行合同义务或者履行合同义务不符合约定,给对方造成损失的,损失赔偿额应当相当于因违约所造成的损失,包括合同履行后可以获得的利益,但不得超过违反合同一方订立合同时预见到或者应当预见到的因违反合同可能造成的损失.     

Dynamics of a railway vehicle on a laterally disturbed track

In this article a theoretical investigation of the dynamics of a railway bogie running on a tangent track with a periodic disturbance of the lateral track geometry is presented. The dynamics is computed for two values of the speed of the vehicle in combination with different values of the wavelength and amplitude of the disturbance. Depending on the combinations of the speed, the wavelength and the amplitude, straight line forward motion, different modes of symmetric or asymmetric periodic oscillations or aperiodic motions, which are presumably chaotic, are found. Statistical methods are applied for the investigation. In the case of sinusoidal oscillations they provide information about the phase shift between the different variables and the amplitudes of the oscillations. In the case of an aperiodic motion the statistical measures indicate some non-smooth transitions.     

Dynamical Analysis of a Simple Vehicle on a Periodic Guideway

The dominant vertical motions of a simple vehicle traveling on a flexible periodic guideway is investigated. The mathematical model leads to a state equation with periodic coefficients and periodically jumping states. The aim of the paper is the dynamic analysis of the vehicle-guideway system with respect to stability, guideway deflections and vehicle accelerations. As alternative to the common simulation technique, the analytical solution based on Floquet theory is applied. Both methods are implemented in a computer program and used to perform a detailed parameter study which shows the dependence of the dynamical system behavior on the nondimensional system parameters.     

桥梁遭受船舶撞击的有限元仿真分析

桥梁在船舶碰撞时受到的动力荷载是复杂的动力非线性问题,近代非线性有限元技术为该问题提供了有效的工具。文中简述了该技术的基本原理,运用ANsYs／LS—DYNA对一艘10000t船和桥梁的碰撞进行了模拟,并建立了3个不同的桥墩有限元模型,从碰撞力、桥墩应力、变形等不同角度分析了不同的建模方式对碰撞结果的影响。结果表明,3种模型的计算结果具有较好的一致性,可以满足一般的工程精度要求。     

Transient Dynamic Analysis of a Linear Model of a Bus

Transient analysis of a linear model of a bus was performed. In the experiment the right front wheel of the bus rolled over a bump and one acceleration, two axil forces in the wheel suspension and two bending moments in the frame of the bus were measured. The different parts of the bus were modelled by uniform Rayleigh-Timoshenko beams and rigid bodies. This beam element has a uniformly distributed stiffness, inertia and viscous and/or hysteretic damping along its axis. The loading of the bus due to the bump was in the theoretical analysis modelled by a prescribed transient displacement of the model of the wheel. The fast Fourier transform technique was utilized. Fairly good agreement between calculated and measured values was obtained.     

投资产品名称

古希腊哲学家柏拉图曾经说过：“各种疾病的名称显得奇奇怪怪，”但是如果你仔细研究就会发现，这些名称里面包含一定的道理。像哮喘（Asthma）、腰背疼痛（Lumbago）、肌痛性脑病（myalgic encephalopathy）、鹅口疮（thrush）、心绞痛（angina）、破伤风（tetanus）以及高胱氨酸尿症（homocystinutia）等等，无不是选用了较为生僻罕见的称谓，保留了自己特有的方式特点。     

总经理致辞

中国机动车辆安全鉴定检测中心(以下简称中国车检中心)成立于1988年6月,国有高新技术企业。经过二十一年的发展,逐步形成了机动车检测系统开发、检测线制造、汽车认证、汽车信息库、特种车改装、智能交通及相关培训等紧密围绕汽车产业的主营业务;同时,近年来在防伪证件印制、智能卡制造、转印膜生产、证照研发等新技术领域也取得了     

总经理致辞

中国机动车辆安全鉴定检测中心(以下简称中国车检中心)成立于1988年6月,国有高新技术企业。经过二十一年的发展,逐步形成了机动车检测系统开发、检测线制造、汽车认