基于CAN总线的柴油机数据采集系统设计

设计了基于CAN总线的柴油机运行参数采集系统,以C8051F040单片机为核心,采用传感器、信号调理模块和AT45DB161存储芯片实现数据的采集与存储,阐述了系统的硬件结构和程序设计。试验表明,设计的系统可快速准确地采集柴油机各种运行参数,实现实时采集、历史数据存储,扩展方便,经济实用。     

基于LCA的低碳公路的实现途径

公路作为交通运输的主要组成部分,从设计施工到投入运营,全程均会产生大量的能源消耗和碳排放.随着全球气候问题、环境问题和能源问题日益突出,如何使公路走可持续的、低碳化的发展道路,越来越受到关注.着眼于公路从规划、设计、施工、运营管理到养护的全部过程,提出了基于生命周期评价LCA(Life Cycle Assessment)的低碳公路的实现途径,在保证质量和效率的前提下,对各个环节进行考量,以求能够使得公路从设计施工到运营管理的整个生命周期的能源消耗和碳排放降至最低.     

基于光学测量的高速列车线路安全监控技术

针对高速列车运行中,列车本身无有效的安全监控装置,为填补高速列车车载线路安全监控的空白,根据高速列车运行环境、制动距离及安全监控需求,对可能的探测技术进行性能比选,分析表明以制冷型中波红外探测技术为核心的监控系统能够实现远距离的实时高分辨探测。在此基础上完成系统总体参数设计,并完成一套长焦距、小尺寸、100%冷阑匹配的光学子系统设计。最后搭建整机系统,并进行铁路现场实验测试。研究结果表明:该系统能够在雾霾等不良气象条件下昼夜对列车前方4 km外的铁轨以及障碍物等目标进行实时可靠探测,能为高速列车运行提供一种新型主动安全监控技术。     

Ultimate strength analysis of composite stiffened panels based on multi-scale approach北大核心CSCD

［Objectives］As composite materials have varied internal structures, an in-depth analysis of the damage mechanisms of their component materials can provide a research foundation for the ultimate strength analysis of composite stiffened panels. ［Methods］The microscopic, mesoscopic and macroscopic mechanical analyses of marine glass fiber reinforced plastic (GFRP) composite stiffened panels are carried out using a multi-scale approach. Microscopic and mesoscopic representative volume element (RVE) models of chopped strand mat (CSM) and woven roving (WR) materials are established, and the macroscopic equivalent stiffness is obtained by homogenizing the RVE models. The ABAQUS VUMAT subroutine is used to code the progressive damage evolution model of the composite materials to derive the damage evolution mechanism of the microscopic and mesoscopic models respectively. The equivalent strength of macroscopic laminates is also obtained. ［Results］The multi-scale approach can be used to accurately evaluate the macroscopic mechanical properties of composite materials, and the ultimate strength of composite stiffened panels is mainly determined by fiber bundle failure. ［Conclusions］The obtained macroscopic material parameters can be used to calculate the ultimate strength of composite stiffened panels, while the parametric study of the mesomechanics of composite materials can provide an analysis tool for investigating the influence of material processing technology. © 2023 Chinese Journal of Ship Research. All rights reserved.