稀浆封层技术在奉铜高速公路中的应用

为提高路面结构层的使用性能.文章结合奉铜高速公路工程建设项目,从稀浆封层的作用机理、配合比设计、施工控制、质量检验等方面,对稀浆封层技术进行详细的阐述,以供参考.     

高速公路上面层石料适用性研究

江苏省高速公路上面层以玄武岩为主,高速公路的迅猛发展及石料资源分布的不平衡导致局部玄武岩供应紧张,室内试验及试验路资料表明,在使用改性沥青并添加液体抗剥落剂后,石英砂岩、花岗岩、凝灰岩及安山岩与沥青粘附性能够满足江苏省高速公路技术标准的要求,沥青混合料具有良好的高温、低温性能,抗水损害能力,石英砂岩、花岗岩、凝灰岩及安山岩等石料可以应用于高速公路上面层。     

橡胶沥青在高速公路加铺改造中的应用

采用对比分析的方法,对橡胶沥青在高速公路加铺改造中的应用性能进行了详细的研究,结果表明橡胶沥青具有突出的低温抗裂能力、高温抗变形能力、优异的耐疲劳性能,适合于高速公路的加铺改造。全寿命周期分析表明橡胶沥青最经济,同时性价比最高。     

考虑人口结构变化的城市客运机动车辆发展规模研究

随着我国社会老龄化程度加剧,这种社会群体年龄结构的变化会对整个社会交通需求产生一定影响.本文以我国人口发展和人口年龄结构变化为背景,引入人口发展预测模型,研究人口年龄结构变化对居民出行次数和出行方式的影响,进而根据这种人口发展所引发的交通需求变化,采用层次分析法预测未来年城市客运机动车辆发展规模,并结合实例(张家港市城区客运机动车辆发展规模预测)对该计算方法进行了验证.计算结果表明该方法是一种合理的计算方法.     

An optimal model-based trajectory following architecture synthesising the lateral adaptive preview strategy and longitudinal velocity planning for highly automated vehicle

Automated driving has received a broad of attentions from the academia and industry, since it is effective to greatly reduce the severity of potential traffic accidents and achieve the ultimate automobile safety and comfort. This paper presents an optimal model-based trajectory following architecture for highly automated vehicle in its driving tasks such as automated guidance or lane keeping, which includes a velocity-planning module, a steering controller and a velocity-tracking controller. The velocity-planning module considering the optimal time-consuming and passenger comforts simultaneously could generate a smooth velocity profile. The robust sliding mode control (SMC) steering controller with adaptive preview time strategy could not only track the target path well, but also avoid a big lateral acceleration occurred in its path-tracking progress due to a fuzzy-adaptive preview time mechanism introduced. In addition, an SMC controller with input–output linearisation method for velocity tracking is built and validated. Simulation results show this trajectory following architecture are effective and feasible for high automated driving vehicle, comparing with the Driver-in-the-Loop simulations performed by an experienced driver and novice driver, respectively. The simulation results demonstrate that the present trajectory following architecture could plan a satisfying longitudinal speed profile, track the target path well and safely when dealing with different road geometry structure, it ensures a good time efficiency and driving comfort simultaneously.     

一种宽电压输入高功率密度低噪声三相隔离型逆变器

随着舰船综合电力系统向小型化、轻型化、高效率和隐形化方向不断发展，储能环节逐渐成为发电系统的重要组成部分，对于变配电系统的三相隔离型逆变器来说，面临着直流电压范围宽、交流电能质量要求高的挑战，而且需要尽可能提高功率密度、降低噪声干扰. 为此，提出了一种高功率密度低噪声的三相二重化逆变器工频隔离拓扑. 首先，采用多重化技术以提高等效开关频率，达到相电压四倍频五电平的效果，降低声学噪声和振动噪声，减小隔振降噪设备的体积质量；其次，采用载波移相调制策略降低共模电磁噪声，减小EMI （electromagnetic interference）滤波器的体积质量；最后，采用磁集成技术和立体卷铁芯结构减小隔离变压器和输出滤波电感的体积质量. 通过实验证明:与传统拓扑结构相比，新型拓扑的声学噪声降低了8 dBA，振动噪声全频段范围都比传统拓扑低；体积功率密度达到136 kW/m3，质量功率密度达到116 kW/t，整机效率达到93.5%.      

轻型汽油车I型排放与工况油耗影响因素

通过对手动汽油乘用车进行试验,分别研究在满足标准情况下试验前不同的机油及冷却水温度、底盘测功机道路阻力设定方法、CVS[1](Constant Volume Sampling,等容取样法)流量以及驾驶员对尾气排放及工况油耗的影响程度,并分别提出控制建议.因此,严格控制记录试验室排放及工况油耗测量试验过程,对试验的一致性和重复性具有重要作用.     

船闸人字闸门易磨损件材料的应用

结合万年闸船闸人字闸门维修,分析问题原因,探讨船闸人字闸门运转件中易磨损件材料的选择,阐述对国内自润滑材料的认识。     

Real-time partway deadheading strategy based on transit service reliability assessment

This paper presents a partway deadheading strategy for transit operations to improve transit service of the peak directions of transit routes. This strategy consists of two phases: reliability assessment of further transit service and optimization of partway deadheading operation. The reliability assessment of further transit service, which is based on the current and recent service reliability, is used to justify whether or not to implement a partway deadheading operation. The objective of the second phase is to determine the beginning stop for a new service for the deadheaded vehicle by maximizing the benefit of transit system. A heuristic algorithm is also defined and implemented to estimate reliability of further transit service and to optimize partway deadheading operation. Then, the partway deadheading strategy proposed in this paper is tested with the data from a transit route in Dalian city of China. The results show the partway deadheading strategy with the reasonable parameters can improve transit service.