Two-port network based bilateral control of a steer-bywire system

Steer-by-wire (SBW) system which is characterized by variable steering feel, better active safety, unmanned drive, has been widely studied to realize a distinctive driving experience. Control strategy acts as a key part of SBW system to achieve the goals. In this paper, a control strategy by bilateral control structure for steer-by-wire system is proposed. To make SBW system has the same function of conventional steering systems, the controller is designed to realize desired tracking control and realistic road feel feedback. The control of position and torque for each actuator is taken as two ports for the control network. Based on different control loop, two kinds of bilateral control is investigated respectively. The hardwarein- the-loop experiment platform of SBW is developed by the reconfiguration of electric power steering system. The test results are compared to show the performance of different control loops.     

基于人工神经网络的船舶油耗模型

针对船舶能效管理计划SEEMP的实施需求,寻求建立油耗模型的通用方法,为航行优化提供决策基础。以丹麦籍客滚轮MS Smyril号作为研究案例,对船舶实测运行数据进行了分析和预处理,并采用人工神经网络构建了船舶油耗和航速的黑箱模型。基于实测数据与模型预测数据的对比,验证了上述油耗模型的准确性和实用性,对于提高船舶能效运行指数EEOI具有重要意义。     

碰撞事故时超大型浮体模块连接处荷载特性研究

精确评估模块连接处荷载特性对超大型浮体的水动力设计及结构安全性研究具有重要的工程意义。文章以5模块半潜式超大型浮体为研究对象,考虑碰撞荷载和风、浪、流环境荷载的联合作用并采用AQWA软件对超大型浮体模块连接点处的受力特性开展了数值计算。船舶碰撞荷载简化为矩形脉冲,采用定常风、定常流以及JONSWAP波谱,探讨了船舶碰撞角度、撞击位置、环境荷载等因素对模块连接点受力特性的影响。该文的研究成果可为事故荷载作用时超大型浮体连接器结构设计和强度计算提供一定依据。     

高职汽车专业英语课程思政教学应处理好的几个关系

高职汽车专业英语课程思政教学要在保持课程自身特性基础上,针对教学难点,处理好教学目标多维要素之间、三个门类的教学内容比例、教师与学生之间,课程思政育人效果评价和汽车专业英语教学评价之间的四个关系,是实现思政育人目的的重要途径.     

Economy Analysis of a Recycle Model of End-of-Life Vehicle

In order to evaluate recycle economy of end-of-life vehicles quantitatively,an economy model based on a recycle model of end-of-life vehicles and recycle cost analysis. With a practical example of recycling engines of end-of-life vehicles ,the validity of the recycle economy model and good recycle economy of the end-of-life vehicle engine were justified. It is concluded that ① remanufacture-ability of the part or component of the vehicles; ② the organization and management level of a recycle corporation; ③ policies and regulations of the government are crucial factors to raise the recycle economy of the end-of-life vehicle.     

Feature Selection for SVM Classifiers Based on Discretization

The rough sets and Boolean reasoning based discretization approach （RSBRA） is not suitable for feature selection for machine learning algorithms such as neural network or SVM because the information loss due to discretization is large. A modified RSBRA for feature selection was proposed and evaluated with SVM classifiers. In the presented algorithm, the level of consistency, coined from the rough sets theory, is introduced to substitute the stop criterion of circulation of the RSBRA, which maintains the fidelity of the training set after discretization. The experimental results show the modified algorithm has better predictive accuracy and less training time than the original RSBRA.     

一次温带风暴潮对天津沿海的影响及特征分析

2009年4月15日,我国渤海、黄海部分岸段经历一次较强的温带风暴潮过程。给天津沿海企业及航行或锚泊的船舶造成一定的经济损失。文章利用天气图及海洋站实测水文气象资料分析此次风暴潮过程。     

港区引进集中供热节能减排保护环境

为节约能源,保护环境,秦皇岛港东港区采用热厂集中供热系统,取代低效率、小容量的区域供热系统。介绍了具体的做法和一些创新点。项目实施后,节约了能源,有效地改善了区域环境,值得在有条件的港口加以推广。