A virtual environment for the formulation of policy packages

The interdependence and complexity of socio-technical systems and availability of a wide variety of policy measures to address policy problems make the process of policy formulation difficult. In order to formulate sustainable and efficient transport policies, development of new tools and techniques is necessary. One of the approaches gaining ground is policy packaging, which shifts focus from implementation of individual policy measures to implementation of combinations of measures with the aim of increasing efficiency and effectiveness of policy interventions by increasing synergies and reducing potential contradictions among policy measures. In this paper, we describe the development of a virtual environment for the exploration and analysis of different configurations of policy measures in order to build policy packages. By developing systematic approaches it is possible to examine more alternatives at a greater depth, decrease the time required for the overall analysis, provide real-time assessment and feedback on the effect of changes in the configurations, and ultimately form more effective policies. The results from this research demonstrate the usefulness of computational approaches in addressing the complexity inherent in the formulation of policy packages. This new approach has been applied to the formulation of policies to advance sustainable transportation.     

Strain estimation for offshore wind turbines with jacket substructures using dual-band modal expansion

Structural fatigue is a design driver for offshore wind turbines (OWT). In particular, the substructures, like jackets, are strongly affected by fatigue. Monitoring the fatigue progression in the welds is vital for the maintenance and a potential lifetime extension. However, inspections of critical locations are costly due to the limited accessibility of the mostly submerged jacket. Considering the high number of potentially critical welds, it is regarded as economically unfeasible to equip all fatigue hot spots with sensors. Thus, an indirect method to monitor the fatigue progress of the structure and point out critical locations is desirable. For a consistent support of ongoing maintenance, it has to yield reliable results for varying operational and environmental conditions. This paper applies a virtual sensing approach to jacket substructures. From a small set of sensors on the tower, fatigue at every desired location of the jacket is estimated using dual-band modal expansion. Simulations using the OC4 jacket design are performed to show potentials and limitations of the method. Namely fatigue progress on leg welds of K-joints is predicted with high accuracy over a wide range of load cases. However, some difficulties in fatigue prediction of X-joints due to the occurrence of local modes and limitations in the extrapolation of wave loading have to be resolved in future work.     

基于LabVIEW的电容器补偿软件的优化设计

介绍了基于LabVIEW图形化的虚拟仪器设计、构成、特点及其发展现状和前景。根据电容器补偿原理，提出软件设计思路，利用软件对实测的数据进行了分析，提出补偿意见，达到了预期目的。     

某型货车平顺性虚拟实验

通过对某货车整车参数的详细分析及基于虚拟样机技术和多体系统动力学理论创建的货车前后悬架、转向系、车身等子系统,建立了整车模型和四立柱试验台,并且基于专业软件ADAMS/CAR和MATLAB进行了平顺性仿真和分析。文章通过构建某型货车平顺性虚拟实验,可以预测产品的整体性能,进而改进产品设计、提高产品性能。这对启迪设计创新、提高设计质量、加快产品开发周期有重要意义。     

基于虚拟仪器的驱动电机转矩脉动测试系统

转矩脉动是当前研究直流无刷电机的热点问题,鉴于当前转矩脉动的测试方法存在不足,用LabVIEW平台和数据采集卡,开发了基于虚拟仪器的电机转矩脉动测试系统。本测试系统是通过测取电机转矩来实现转矩脉动的提取,能够实现传感器输出信号和电机转矩值的显示,同时还能实现测量数据的保存以及读取。试验表明,该测试系统能较好的显示转矩脉动的幅值和频率等特征,而且易于使用,界面友好。     

虚拟仪器在汽车滑行试验的应用研究

汽车滑行试验是进行汽车相关性能试验的前提试验,试验数据的精确与否直接影响到车辆相关性能的评价,为了对滑行试验数据进行精确的记录并存储,本文将虚拟仪器应用到试验当中,设计一套试验测试系统,该系统具有简单、有效、易于操作和实施的特点。     

发动机ECU模拟系统通信模块设计与应用

为使发动机ECU模拟系统能够安全、稳定、准确与及时地模拟发动机在工作时的状态,研发具有安全可靠的网络通信功能和可靠高速的USB总线数据采集处理的通信模块是必要的。文章描述了系统通信组件的建立、USB1.1总线数据采集、CAN通信协议制定及CAN—USB数据转换方式。通信的成功建立,实现了模拟发动机各种传感器信号以及模拟汽车真实的CAN网络等功能。发动机ECU模拟系统作为一种智能化汽车电子开发工具成为现实。     

虚拟仿真技术在高职教学中的应用研究

文章以黄冈职业技术学院在"电气控制线路的安装与调试"课程中开展的虚拟仿真技术开发和教学方面为例,揭示了虚拟仿真技术在当前高职教学中的重要作用。指出利用虚拟仿真技术辅助高职教学可以解决实验、实训设备短缺、教学方法和手段落后、教学效果不理想等问题,对培养学生的动手能力和创新意识具有深远的影响。     

随船器材保障可视化系统建设的研究

利用射频识别、二维条码、虚拟现实等技术进行随船器材保障可视化系统建设研究.该系统覆盖仓储、收发、定位等环节,可直观、准确、及时地获取数据,达到随船器材库存动态可视、消耗实时掌握、收发全程可控的目的.     

基于Labview的试验室数据采集系统

本文简要介绍了试验室数据采集系统的组成和主要实现技术,详细介绍了数采系统及其软件程序的各个组成部分,该程序实现了对试验室的各种数据进行采集、实时显示、海量数据存储、查询数据、定制报表和图表等。该数据采集系统具有采集精度高、实时性强、可靠性高和操作简便灵活等特点。