Multiscale approach for the design of composite sandwich structures for train application

In the present work a multiscale approach is considered for the design of composite sandwich structures for a roof of railway vehicle. The procedure consists in different steps that start from cost/benefit analysis on materials and their manufacturing process and cycle up to analysis of sub-components and entire structures. Each step is characterized by experimental, theoretical and numerical studies. The design activities herein presented count experimental campaigns able to characterize both the properties of novel sandwich material, manufactured expressly for transportation industry, the sandwich and joint behaviors. Analytical and numerical approaches have been used to validate and optimize the structural layout. Finite element analysis has been also performed on a test article to verify the “new” sandwich roof in regard to structural requirements suggested by European Code.     

汽车与建筑的形态发展

分析了汽车的产生对建筑单体的影响,探讨了汽车对街道的改变,研究了汽车与城市的相互作用,以帮助人们正视汽车与城市的关系,总结发达国家处理两者关系的经验和教训,探索汽车发展和城市发展的双赢之路。     

车辆器材保障能力的综合评价

通过对车辆器材保障系统界定和分析，找出了其主要影响因素，建立了车辆器材保障能力综合评价指标体系；并利用AHP评价方法确定各因素权重，达到初步量化的目的。     

Eight‐degrees‐of‐freedom kinematic model demonstrating after‐impact motorcycle's behavior

Abstract

Deriving a precise kinematic model to describe a motorcycle's behavior after impact is a prerequisite for developing a fact‐analytical tool for motorcycle accidents. Therefore, this paper successfully derives a high‐degrees‐of‐freedom model. Twenty‐four time‐response illustrations of simulation results demonstrate the dynamic behavior of the proposed model. A surface diagram is revealed while investigating the vehicle tracking. The twenty‐four illustrations include motion, velocity and acceleration with respect to longitudinal, lateral, vertical, pitching, yawing, vehicle rolling, rider rolling, and steering variations. The model proposed herein can be effectively used to preliminarily analyze the tendency toward stability or toward rolling of a motorcycle after a collision.     

寺河矿井下胶轮车控制模型的研究

重点介绍了寺河矿井下运输大巷胶轮车监控系统在研发过程中控制模型的研究,主要包括现场模型建立、控制方式研究等。     

汽车后下部防护试验台设计与研制

对整个试验台进行了总体设计并提出了实现后下部防护试验台的总体设计方案,对汽车后下部防护试验台的设计要求与研制的试验台技术参数进行了对比,通过试验与误差分析,证明了本试验台符合汽车后下部防护试验台设计的要求,具有检测汽车后下部防护装置的能力.     

车辆装料扬尘控制用单侧吸气流的正交模拟试验研究

利用正交模拟试验方法研究了单侧吸通风气流组织方式对干熄焦筛焦楼火车装焦的尘源控制效果,得到了单侧吸风的尘源捕集效率与排风罩设计参数之间的函数关系式,并进行无量纲分析,得到了对尘源实现完全控制时所需的最小风量。     

Power quality impacts of high-penetration electric vehicle stations and renewable energy-based generators on power distribution systems

High-penetration renewable energy-based generators (REGs) in distribution systems have increased the importance of impact assessment involving these systems. This assessment focuses on power quality (PQ) and compatibility between REGs and existing system components. Electric vehicle (EV) technology has also recently achieved a substantial market share. This technology requires the development of charging stations similar to current petroleum fuelling stations in the near future. Thus, the effect of EV stations (EVSs) on PQ must also be considered. This study presents a PQ analysis on the effects of high-penetration EVS and REG systems, including wind turbines, grid-connected photovoltaics (PVs), and fuel cell (FC) power generation units on a modified 16-bus distribution system under different loading and weather conditions. All data on EVS, wind farm, PV, and FC units as well as weather conditions presented in this paper were collected from different power companies and the Malaysian Meteorological Department. The system is modelled and simulated using the MATLAB/Simulink software to study the effects of these technologies on system performances at various penetration levels. Simulation results indicated that the presence of high-penetration EVSs and REGs can cause severe PQ problems such as frequency and voltage fluctuations, voltage drop, harmonic distortion and power factor reduction.     

Symbiotic organisms search and two solution representations for solving the capacitated vehicle routing problem

This paper presents the symbiotic organisms search (SOS) heuristic for solving the capacitated vehicle routing problem (CVRP), which is a well-known discrete optimization problem. The objective of CVRP is to decide the routes for a set of vehicles to serve a set of demand points while minimizing the total routing cost. SOS is a simple and powerful metaheuristic that simulates the symbiotic interaction strategies adopted by an organism for surviving in an ecosystem. As SOS is originally developed for solving continuous optimization problems, we therefore apply two solution representations, SR-1 and SR-2, to transform SOS into an applicable solution approach for CVRP and then apply a local search strategy to improve the solution quality of SOS. The original SOS uses three interaction strategies, mutualism, commensalism, and parasitism, to improve a candidate solution. In this improved version, we propose two new interaction strategies, namely competition and amensalism. We develop six versions of SOS for solving CVRP. The first version, SOS_Canonical, utilizes a commonly used continuous to discrete solution representation transformation procedure. The second version is an improvement of canonical SOS with a local search strategy, denoted as SOS_Basic. The third and fourth versions use SR-1 and SR-2 with a local search strategy, denoted as SOS_SR-1 and SOS_SR-2. The fifth and sixth versions, denoted as ISOS_SR-1 and ISOS_SR-2, improve the implementation of SOS_SR-1 and SOS_SR-2 by adding the newly proposed competition and amensalism interaction strategies. The performances of SOS_Canonical, SOS_Basic, SOS_SR-1, and SOS_SR-2 are evaluated on two sets of benchmark problems. First, the results of the four versions of SOS are compared, showing that the preferable result was obtained from SOS_SR-1 and SOS_SR-2. The performances of SOS_SR-1, SOS_SR-2, ISOS_SR-1, and ISOS_SR-2 are then compared, presenting that ISOS_SR-1 and ISOS_SR-2 offer a better performance. Next, the ISOS_SR-1 and ISOS_SR-2 results are compared to the best-known solutions. The results show that ISOS_SR-1 and ISOS_SR-2 produce good VRP solutions under a reasonable computational time, indicating that each of them is a good alternative algorithm for solving the capacitated vehicle routing problem.     

总装的返修工艺能力提升

通过对总装车间内返修工艺的介绍,着重分析了整车厂总装生产过程中,应如何对返修这一工艺环节实现标准化、受控化管理.阐明了我们应如何在有限的投入下,提高返修工艺环节的纠错效果及其重要意义.