智能网联汽车环境感知传感器技术课程资源开发

智能网联汽车作为整个汽车领域的新兴产业,在"1+X"证书制度的推动下,势必会给职业院校汽车专业带来巨大的改变。基于此,文章在分析智能网联汽车环境感知传感器技术课程资源开发原因的基础上,从前期调研、教学资源开发和教学实施与评价三个方面提出课程开发整套流程的思路,归纳出该课程具体的实训项目,推动职业院校汽车专业与时代接轨。     

基于视觉识别技术的“1+X”汽车类技能评价系统的设计

1+X证书制度的提出,对职业教育的人才培养、评价方式必然产生影响,其相应的模式、制度、机制等已经引起了变化并且将会随着发展发生更加深远的影响。另外一方面,随着信息技术、智能化技术的发展,1+X证书制度的落实与实施上,也必然出现新的呈现方式。本文基于职业教育评价与视觉识别技术的相结合,提出设计一种基于视觉识别技术的1+X技能评价系统,利用视觉识别判断技术,进行辅助教学与评价。     

1+X证书制度背景下汽车专业“三教改革”的实施路径

职业院校是高素质技术技能型人才培养的重要基地,随着社会经济的发展,社会对人才的需求也发生了很大变化,要求既能懂技术又能懂生产,学生毕业就能直接上岗。因此,对职业院校的人才培养模式也带来了新的挑战,为了培养出更加符合现代社会发展需要的汽车专业人才,需要依托"1+X"证书制度,积极探索适合职业院校发展的人才培养模式,认真实施"三教改革",培养出高质量的复合型汽车专业人才。     

Remaining fatigue life assessment of corroded mooring chains using crack growth modelling

Failures caused by the combined actions of fatigue, corrosion and wear are important safety concerns for mooring chains used on floating structures in the oil and gas industry. Prediction of remaining corrosion fatigue life based on surface condition could therefore be a useful tool for the continued safe operation of corroded chains. This paper investigates the use of crack growth modelling for estimating the remaining corrosion fatigue life of mooring chains that exhibit significant pitting corrosion damage. A crack growth modelling approach is used to produce remaining fatigue life estimates for a selection of severely pitted mooring chains. Using fatigue crack growth rate test results for grade R4 high strength mooring chain steel, empirical crack growth laws are presented for free corrosion and cathodic protection conditions at load ratio R = 0.1. Two different methods for establishing equivalent cracks from surface scans of corrosion damage are presented. The mooring chains are proof loaded as part of their manufacturing process. Residual stresses introduced during this process have therefore been determined by finite element analysis and accounted for in the fatigue crack growth predictions. One of the equivalent crack models, accounting for the single dominant corrosion pit, provided quite accurate fatigue life predictions when compared with full scale test results.     

Design and model test of a soft-connected lattice-structured floating solar photovoltaic concept for harsh offshore conditions

Various types of floating solar photovoltaic (FPV) devices have been previously proposed, designed and constructed with applications primarily limited to onshore water bodies or near-shore regions with benign environmental conditions. This paper proposes a novel FPV concept which can survive harsh environmental conditions with extreme wave heights above 10 m. This concept uses standardised lightweight semi-submersible floats made of circular materials as individual modules. The floating modules are soft connected with ropes to form an FPV array. We first present the conceptual design of the floats and the connection systems, including hydrostatic, hydrodynamic, and structural assessments of the floats. To verify the motion response performance, we carried out 1:60 scaled model tests for a 2 by 3 array under regular and irregular wave conditions. From the time series and response spectra, the motion characteristics of the array and the mooring responses are analysed in detail. The proposed concept exhibits excellent performances in terms of modular motions with limited wave overtopping and no contact is observed between adjacent modules under the extreme wave conditions. The findings of this study can serve as a valuable reference to developing reliable and cost-effective FPV technologies for offshore conditions.     

津滨轻轨客流特征及功能定位研究

津滨轻轨9号线是连接天津市中心城区和滨海新区的骨干轨道线路,对天津市双城格局的形成起到重要的支撑作用.依托天津市轨道交通AFC票务数据,整理分析津滨轻轨9号线的现状客流特征,包括其客流增长规律和客流的时间、空间分布特征,以及津滨轻轨在地铁5号线开通后,对城区客流服务的增强等内容.基于客流特征,研究分析津滨轻轨现状和规划...