浙江省单建式地下停车场设计研究

针对城市内停车难的问题，以经济较发达的浙江省为背景，结合现有标准和规范，提出了具体的设计思路和设计方法；同时，从政策支持、实际需要、社会影响和设计要点等方面对单建式地下停车场进行了剖析，以期为后续类似项目的设计提供借鉴。     

自动泊车关键技术研究进展综述

自动泊车是汽车智能化的重要组成部分，代替了驾驶员进行泊车的繁琐操作，减少了泊车事故的发生，在新车上的装载量大幅增加。为了研究自动泊车的发展现状、现有不足与发展趋势，对自动泊车应用现状进行了分析，又从车位探测、路径规划和跟踪控制等技术方面进行了分析，总结现有自动泊车关键技术存在的不足之处和局限性，提出了自动泊车关键技术研究的未来趋势，为从事自动泊车技术研究提供参考。     

基于场景的智能网联汽车“三支柱”安全测试评估方法研究

随着汽车智能化、网联化以及自动驾驶技术的快速发展，搭载自动驾驶功能的智能网联汽车目前正处于测试验证转向多场景示范应用的新阶段，产业化应用需求日益迫切，车辆安全问题更加凸显，针对车辆产品安全的测试评估方法成为关注焦点。由于智能网联汽车及其运行环境的复杂性以及安全事件的偶发性，传统的高里程实车测试在效率、成本等方面难以适应自动驾驶测试评估的发展需要。从第三方视角出发，在汽车生产企业研发测试的基础上，结合工程实践与应用需要，通过分析智能网联汽车的安全目标，对比模拟仿真、封闭场地和实际道路3种测试方法的特点及优缺点，提出基于场景的 “三支柱”融合测试评估方法，为综合评估智能网联汽车的安全性提供支撑。     

Uncertainty analysis of extreme mooring loads associated with environmental contours and peak tension distributions

This paper aims to assess the uncertainty on the extreme mooring loads of floating system considering short-term variability. Two environmental contour approaches based on the inverse First and Second Order Reliability Methods are employed to identify critical sea states that may give rise to extreme loads. The uncertainty related to the construction of environmental contours is addressed including significant differences due to marginal distribution fitting, parameter estimation methods and joint models. Three measured datasets are analysed using a known conditional joint distribution and proposed mixed copula model. 3-h time domain numerical simulation for each sea state is conducted and the characteristic extreme responses of mooring lines subjected to design loads are assessed. The uncertainties due to various statistical models including the average conditional exceedance rate method as well as global maxima, peak-over-threshold method combined with Gumbel distribution, Generalized Extreme Value distribution, Generalized Pareto distribution and 3-parameter Weibull distribution are investigated and quantified. It is observed that marginal distributions, joint models and parameters estimation methods have apparent effect on design loads estimation, and the extreme tensions of the semi-submersible platform shows significant difference using various probabilistic models. The results indicate that those epistemic uncertainties should be account for in the reliability analysis or safety factor calibration for mooring systems.     

合肥市高新区某区域交通改善研究

以合肥市高新区某区域交通拥堵改善研究着手，通过分析现状道路交通拥堵原因，提出深挖现有路网潜力、加强路面停车管理、优化交通组织结构以及对现状道路进行局部改造等一系列建议，力争在较少的工程投资下最大限度地释放道路通行能力。所提建议对城市道路交通改善研究和改造具有一定借鉴意义。     

大型室外停车场规划关键技术研究

停车场总体规划和流程设计,对使用的旅客和停车场管理方都有着重要影响.通过合理规划停车分区、流程设计和标识引导等,不仅能够减少司机场内绕行,而且能够有效降低大型停车场的管理难度.以西安咸阳国际机场航站楼前车场的改造为例,浅析室外停车场改造思路,重点分析了车场内的分区设计、流程设计和标识引导,以期为同类型的车场改造和新建工...     

Required test durations for converged short-term wave and impact extreme value statistics — Part 1: Ferry dataset

For the design of maritime structures in waves, the extreme values of responses such as motions and wave impact loads are required. Waves and wave-induced responses are stochastic, so such responses should always be related to a probability. This information is not easy to obtain for strongly non-linear responses such as wave impact forces. Usually class rules or direct assessment via experiments or numerical simulations are applied to obtain extreme values for design. This brings up questions related to the convergence of extreme values: how long do we need to test in order to obtain converged statistics for the target duration? Or, vice versa: given testing data, what is the uncertainty of the associated statistics? Often the test or simulation duration is cut up in ‘seeds’ or ‘realisations’, with an exposure duration of one or three hours based on the typical duration of a steady environmental condition at sea, or the time that a ship sails a single course. The required number of seeds for converged results depends on the type of structure and response, the exposure duration, and the desired probability level. The present study provides guidelines for the convergence of most probable maximum (MPM) wave crest heights and MPM green water wave impact forces on a ferry. Long duration experiments were done to gain insight into the required number of seeds, and the effect of fitting. The present paper presents part 1 of this study; part 2 [1] presents similar results for wave-in-deck loads on a stationary deck box.     

Required test durations for converged short-term wave and impact extreme value statistics–Part 2: Deck box dataset

In the assessment of wave-in-deck loads for new and existing maritime structures typically model tests are carried out. To determine the most critical conditions and measure sufficient impact loads, a range of sea states and various seeds (realisations) for each sea state are tested. Based on these measurements, probability distributions can be derived and design loads determined. In air gap model testing usually only few, if any, impact loads occur per 3-hour seed. This can make it challenging to derive reliable probability distributions of the measured loads, especially when only a few seeds are generated. In addition wave impact forces, such as greenwater loading, slamming, or air gap impacts are typically strongly non-linear, resulting in a large variability of the measured loads. This results in the following questions: How many impacts are needed to derive a reliable distribution? How is the repeatability of individual events affecting the overall distribution? To answer these questions wave-in-deck model tests were carried out in 100 x 3-hour realisations of a 10,000 year North Sea sea state. The resulting probability distributions of the undisturbed wave measurements as well as the measured wave-in-deck loads are presented in this paper with focus on deriving the number of seeds and exposure durations required for a reliable estimate of design loads.The presented study is Part 2 of a combined study on guidance for the convergence and variability of wave crests and impact loading extreme values. The data set of Part 1 ([1]) is based on greenwater loads on a sailing ferry and the data set of Part 2 on wave-in-deck loads on a stationary deck box.