基于RANSE的螺旋桨模型敞水数值模拟方法研究

本文采用基于RANSE的船舶水动力学CFD求解器,开展螺旋桨模型敞水数值模拟研究,求解器采用基于Laplace权函数插值计算的交界面方法,实现不同计算域之间的耦合计算。以典型螺旋桨模型为对象,研究不同计算方法、网格形式,以及交界面位置对计算结果的影响,通过多方案的对比计算与分析,验证了Laplace权函数插值方法能够提高螺旋桨敞水计算稳定性,保证计算精度。同时给出了螺旋桨敞水性能数值计算的推荐方案,并采用推荐计算方案开展了螺旋桨模型敞水性能计算应用测试,结果与试验数据符合良好,初步建立了基于该水动力学CFD求解器的螺旋桨模型敞水数值模拟方法。     

基于位移剩余的最优货物运输服务分析

基于需求主导原则，突出强调位移需求本身具有的独立价值，本文以位移价值与位移成本之差衡量货运需求主体的位移剩余。以位移剩余最大化为准则揭示货运需求主体选择运输服务方式的机理，并作为最优运输服务的标准。在位移价值测度方面，将货运需求按照时效性分为3类，基于需求主体的预期利益构建相应位移价值函数。在位移成本测度方面，通过对运输价格、运输时间、可靠性、便捷性及安全性等运输服务品质要素的量化，建立位移全过程的成本函数。联立位移价值与位移成本函数，以运输服务品质要素作为核心变量，构建基于位移剩余的最优运输服务分析模型。设置仿真算例，求取不同需求主体的位移剩余曲线，分析相对应的最优运输服务方式。结果显示：模型可基于异质性的位移需求有效分析最优运输服务，并可分析潜在运输需求转化为有效需求的条件，为企业及政府制定运输供给优化策略提供理论基础。     

Charging infrastructure demands of shared-use autonomous electric vehicles in urban areas

Ride-hailing is a clear initial market for autonomous electric vehicles (AEVs) because it features high vehicle utilization levels and strong incentive to cut down labor costs. An extensive and reliable network of recharging infrastructure is the prerequisite to launch a lucrative AEV ride-hailing fleet. Hence, it is necessary to estimate the charging infrastructure demands for an AEV fleet in advance. This study proposes a charging system planning framework for a shared-use AEV fleet providing ride-hailing services in urban area. We first adopt an agent-based simulation model, called BEAM, to describe the complex behaviors of both passengers and transportation systems in urban cities. BEAM simulates the driving, parking and charging behaviors of the AEV fleet with range constraints and identifies times and locations of their charging demands. Then, based on BEAM simulation outputs, we adopt a hybrid algorithm to site and size charging stations to satisfy the charging demands subject to quality of service requirements. Based on the proposed framework, we estimate the charging infrastructure demands and calculate the corresponding economics and carbon emission impacts of electrifying a ride-hailing AEV fleet in the San Francisco Bay Area. We also investigate the impacts of various AEV and charging system parameters, e.g., fleet size, vehicle battery capacity and rated power of chargers, on the ride-hailing system’s overall costs.     

考虑用户偏好的共享汽车混合运营模式优化

针对共享汽车运营商的油车和电车混合车队调度问题，本文将自由流动式和站点借还式两种运营模式相结合，提出考虑用户用车类型偏好的共享汽车系统优化模型。模型为油车和电车车队分别设置了自由流动式和站点借还式的运营模式，并进行运营范围决策、站点选址和车辆调度优化；运营商优先满足用户的用车类型偏好选择，对无法满足偏好的用户进行补贴。根据优化模型基本特征，设计基于梯度的启发式求解方法，对大规模非线性混合整数规划模型进行求解；针对案例区域，比较有无补贴的混合车队模式和单一车队模式的优化结果。结果表明：相比无补贴模式，有补贴模式能够鼓励偏好燃油汽车的用户更多地使用电动汽车，需求满足率从73.4%提高到78.2%，运营商利润提高了46.4%；相比单一类型车队，混合车队能够吸引更多用户使用共享汽车，用户需求数提高了40.6%。     

公路大桥上部箱梁滑移模架施工

介绍了滨州徒骇河大桥上部连续箱梁滑移模架施工,结合工程实际阐述了移动支撑系统的功能、原理、工艺流程及施工过程中控制要点。     

地方高校与区域经济互动发展研究述评

地方高校服务区域经济发展,不仅是经济社会发展的客观要求,也是学校生存和发展的必由之路。关于地方高校与区域经济互动发展的课题,学术理论界近年来进行了比较深入的研究,取得了一批重要成果。本文对近年来的研究文献进行了梳理和系统分析,对未来的深入研究进行了展望。     

Estimating the ride quality characteristics of vehicles with random decrement analysis of on-the-road vibration response data

This paper describes the application of a practical analytical technique based on the random decrement method to estimate the rigid sprung mass dynamic characteristics (frequency response function) of road vehicles using only vibration response data during constant-speed operation. A brief history and development of the random decrement technique is presented, along with a summary of work undertaken on optimal parameter selection to establish the random decrement signature. Two approaches to estimate the dynamic characteristics from the random decrement signature are described and evaluated. A custom, single-wheeled vehicle (physical quarter car) was commissioned to undertake a series of on-the-road experiments at various nominally constant operating speeds. The vehicle, also instrumented as an inertial profilometer, simultaneously measured the longitudinal pavement profile to establish the vehicle's actual dynamic characteristics during operation. The main outcome of the paper is that the random decrement technique can be used to provide accurate estimates of the sprung mass mode of the vehicle's dynamic characteristics for both linear and nonlinear suspension systems of an idealised vehicle.     

基于状态转换的ECU功能测试研究

针对传统设计ECU功能测试用例时无法兼顾输入动作的组合与有序状态迁移的问题,提出一种基于状态转换的黑盒测试用例的设计思想,并结合SCU功能测试用例设计实践,阐明了应用状态转换进行功能测试用例设计的方法和流程,并提供了一整套满足ECU功能测试的软硬件测试系统平台的搭建方案。     

远程油门在粉粒物料运输车上的使用

针对原粉粒物料运输车未配备远程电子油门系统使用不便的问题,介绍了加装了远程油门系统的粉粒物料运输车的使用方法,并为远程油门设计加装了定速装置,可以任意调整发动机转速且能实现任意转速定速功能,为今后类似的设计提供了参考。