本田雅阁轿车自动变速器换挡冲击故障诊断与排除

一辆装备F22B4型发动机,MPOA型自动变速器的本田雅阁轿车,在行驶过程中D4档指示灯不亮,并且自动变速器在换挡时出现较大冲击现象。根据″从简单到复杂,从外部到内部″诊断自动变速器故障的原则,对该故障现象进行了分析诊断,结果是该自动变速器控制TCM功能失效所致。     

基于CMAC的并联混合动力汽车控制策略仿真

提出了基于小脑模型神经网络(CMAC)控制器的能量管理策略,分析了CMAC参数对控制器性能的影响.以ADVISOR2002为仿真平台进行了二次开发,嵌入CMAC控制器,完成了基于CMAC控制器的控制策略、并联电气辅助控制策略和模糊控制策略的仿真比较.仿真结果表明,基于CMAC的控制器具有很好的实时性,可以大幅度改善混合动力汽车的燃油经济性和排放.     

坡高对高边坡变形影响的离心模型研究

通过离心模型试验,揭示了土质路堑高边坡在开挖卸载过程中的变形特性及坡体应力的变化特点,分析了土质路堑高边坡坡高变化对坡体变形特性和虚拟力的影响及两者之间关系,讨论了坡体开挖卸载过程中,正开挖卸载坡面对上下坡面的影响规律。结果表明,坡高增加会改变坡体的应力状态,增大边坡侧向位移,降低边坡稳定性。     

简析如何开发商用车的三缸柴油发动机

当前世界汽车制造业内三缸机的开发成为一股热潮,国内外的许多汽车公司都对三缸发动机有着极大的开发兴趣。与其他款式的发动机相比,三缸机在效率、尺寸以及节能等方面都具有优势,因此在资源逐渐匮乏的当代,开发配置三缸发动机的商用车具有极大的意义。基于此,本文通过分析当前发动机的发展趋势,指出开发商用车三缸机的重要性与发展方向。     

基于HHT及LCS的轨道电路传输变化识别探讨

在轨道电路的实际使用中,受设备工作性能、使用环境的影响,轨道电路传输特性可能发生变化,导致轨道电路传输曲线产生变形。本文以轨道电路区段为单位,先提取主轨道电路传输曲线,再利用希尔伯特变换(HHT)方法提取趋势分量,并利用最长公共子序列(LCS)算法进行趋势分量相似性对比,探测该区段轨道电路感应电压曲线是否存在变形,用来判断轨道电路传输特性是否发生变化。仿真结果表明,该方法能准确识别轨道电路传输特性变化现象,可为轨道电路的故障识别、故障预测、健康管理研究提供支持。     

Can passenger flow distribution be estimated solely based on network properties in public transport systems?

Transportation - We present a pioneering investigation into the relation between passenger flow distribution and network properties in public transport systems. The methodology is designed in a...     

视觉测量技术在汽车零部件尺寸检测中的应用

为了解决汽车零部件尺寸质量采用传统检具检测方法效率低、数据一致性差等问题,有效提高汽车零部件尺寸可控制性,开发了一套基于视觉测量技术的零部件柔性测量系统,并对柔性测量系统的测量精度进行了试验分析.采用该测量系统对标准球进行测量,测量值误差最大为0.015 mm;对实际零部件进行测量,并将测量结果与三坐标测量值相比,孔径...     

Ontology-based model of network and computer attacks for security assessment

With increased cyber attacks over years,information system security assessment becomes more and more important.This paper provides an ontology-based attack model,and then utilizes it to assess the information system security from attack angle.We categorize attacks into a taxonomy suitable for security assessment.The proposed taxonomy consists of five dimensions,which include attack impact,attack vector,attack target,vulnerability and defense.Afterwards we build an ontology according to the taxonomy.In the ontology,attack related concepts included in the five dimensions and relationships between them are formalized and analyzed in detail.We also populate our attack ontology with information from national vulnerability database(NVD)about the vulnerabilities,such as common vulnerabilities and exposures(CVE),common weakness enumeration(CWE),common vulnerability scoring system(CVSS),and common platform enumeration(CPE).Finally we propose an ontology-based framework for security assessment of network and computer systems,and describe the utilization of ontology in the security assessment and the method for evaluating attack efect on the system when it is under attack.     

Advanced unified failure model on uniformly reinforced concrete box section members

Based on the traditional Nielsen model,a unified failure model on the uniformly reinforced concrete box section members under combined forces was introduced by Luo and Liu.One of their contributions is adjustment of the shear carrying capacity of concrete at the member failure surface.In the unified failure model,the comparison with the experimental results verified this adjustment.Nevertheless,it should be pointed out that the adjustment factor of shear carrying capacity at member failure surface for the reinforced concrete members in the unified failure model is a fixed adjustment constant for all experiment data,which is basically determined by curve fitting.However,the adjustment factor should vary with the normal stress at the member failure surface.In this paper,an advanced theoretical model is introduced,in which the adjustment factor of shear carrying capacity at failure surface is a variable related to the normal stress at failure surface.Furthermore,the advanced unified failure model on the uniformly reinforced concrete box section member can still be expressed in a simple form.Finally,the comparison with several groups of test data has verified that this advanced model is more accurate and feasible to be used in design.     

公路桥梁战时遭打击可能性评估研究

公路桥梁作为陆上运输的"咽喉",成为战时敌方打击和破坏的重点。在分析公路桥梁战时重要性和危险性的基础上,运用层次分析法构建了战时公路桥梁遭打击可能性评估模型并进行了实例分析,有助于确定交通保障重点目标和制定保障方案。