高桩码头施工质量通病治理分析

高桩码头施工质量通病具有"小病难治"的特点,其本身的治理效果不仅同施工原材料质量状况、所采用的施工工艺、施工设备的种类、施工人员的操作水平有关,同时还与工程自身的结构特点、施工周边的环境、施工期间的天气与温度等因素有关[1]。因此,如何在既定的自然因素条件下,根据工程自身结构特点合理地优化施工工艺,便成为高桩码头质量通病治理的关键所在。     

动力总成悬置支架的多工况拓扑优化

为保证车辆低振动噪声和高耐久性等性能,动力总成悬置支架的刚度、模态、应力和质量都必须符合一定要求.采用多工况拓扑优化方法对动力总成悬置支架进行改进设计:选择Optistruct作为拓扑优化工具;以最小加权柔度作为目标函数;以模态>650Hz、应力<120MPa、体积<原体积的80%作为约束函数.优化结果表明,新支架一阶模态高于设定目标值,应力水平小于材料的屈服极限,质量比原支架轻了0.4 kg.     

基于EEVC要求的行人碰撞试验台的研制和评估

基于EEVC/WG17制定的行人碰撞保护试验标准,开展了行人模块碰撞试验台的研制工作。文中介绍了该试验台的工作原理和各个功能模块的设计,并利用该试验台进行了行人头部模块和下肢模块碰撞试验,从能量、控制精度和试验可重复性等方面对其试验能力进行了初步评估。试验结果表明,该试验台满足EEVC制定的相关试验要求,可用于行人碰撞保护的研究和设计开发。     

沥青路面就地热再生技术在城市道路中的应用

该文以南京市洪武北路（长江路～珠江路段）就地热再生试验路的铺筑为实例,重点介绍了该种新工艺的沥青混合料的配比、施工方法及质量控制标准。     

快速限流技术在海上平台的应用研究与实践

针对海洋平台电站容量日益增大过程中出现的短路电流过大问题,提出了快速限流器在海洋工程中的几种应用方案,并阐述了各个方案的优缺点及适用范围,给出了其动作值设定方法,最后通过工程实例论证了应用快速限流器在降低系统短路电流方面的可行性及有效性。理论及实践均证明,快速限流器在减少了设备成本投入,减小设备占地空间,保证系统的安全稳定运行方面具有较大优势,在大型海上电力系统及电力系统扩容工程中有广阔的应用前景。     

基于RBF神经网络的电池电解液密度预测

为了对电池电解液密度进行预测,建立了RBF神经网络模型,用电池放电试验数据对其进行了训练和检验。利用训练后的神经网络模型进行了电池电解液密度的预测,预测值与实测值的最大误差值为0.022g/cm~3,均方根误差值为0.004 g/cm~3左右。结果表明,RBF神经网络方法可以满足预测精度要求,从而可用于建立电池剩余电量实时监测系统,降低电池维护工作量并延长电池的使用寿命。     

Competition and regulation in a new integrated transit system across jurisdictional borders

It is often argued lately that some regional transit systems should be integrated to improve the transit services across jurisdictional borders. One of the important issues concerning this integrated transit system is how to make proper use of the competition and regulation to improve its performance and to increase relevant benefits to the authorities, the operators and the passengers. This paper deals with this problem in a new integrated transit system across jurisdictional borders. An optimization model is used to investigate the competition of transit operators in oligopolistic competition transit market (OCTM). An optimization model with nonlinear complementarity constraints is proposed to guide the competition of transit operators using transit subsidy as the regulation means in system optimum transit system (SOTM). By analyzing and comparing the performances of the integrated transit system in two markets, numerical studies show that the competition mechanism should be made full use of and transit subsidy is an important regulation means that should be valued by the transit authorities in the integrated transit system. Copyright © 2016 John Wiley & Sons, Ltd.     

就地冷再生技术在沥青路面养护中的应用

本文以沥青路面就地冷再生技术为主要研究内容,就其专用设备的使用情况进行深入探讨,使用能够实现其性能的专用试剂,并且根据国内外不同的设计方法进行合理的原料配比、性能指标和相关标准进行比较深入的分析.结合实际施工经验,总结出此项技术的施工经验,从而切实提高公路养护质量.     

基于自适应动态滑模控制的智能汽车纵向巡航控制

为消除参数不确定性和外部干扰等因素对智能汽车纵向巡航控制的影响,提出一种基于自适应动态滑模的纵向巡航控制方法.建立以广义纵向力导数项为控制输入的车辆纵向动力学模型,基于反步法构建保证车速与纵向加速度同时收敛于期望值的新型滑模函数;在此基础上,设计了期望广义纵向力的动态滑模控制律,并利用RBF神经网络对控制律中的未知干扰...     

Vehicle Dynamic Control for In-Wheel Electric Vehicles Via Temperature Consideration of Braking Systems

?Vehicle dynamic control (VDC) systems play an important role with regard to vehicle stability and safety when turning. VDC systems prevent vehicles from spinning or slipping when cornering sharply by controlling vehicle yaw moment, which is generated by braking forces. Thus, it is important to control braking forces depending on the driving conditions of the vehicle. The required yaw moment to stabilize a vehicle is calculated through optimal control and a combination of braking forces used to generate the calculated yaw moment. However, braking forces can change due to frictional coefficients being affected by variations in temperature. This can cause vehicles to experience stability problems due an improper yaw moment being applied to the vehicle. In this paper, a brake temperature estimator based on the finite different method (FDM) was proposed with a friction coefficient estimator in order to solve this problem. The developed braking characteristic estimation model was used to develop a VDC cooperative control algorithm using hydraulic braking and the regenerative braking of an in-wheel motor. Performance simulations of the developed cooperative control algorithm were performed through cosimulation with MATLAB/Simulink and CarSim. From the simulation results, it was verified that vehicle stability was ensured despite any changes in the braking characteristics due to brake temperatures.