多性能强耦合分析技术及应用

在车辆性能开发过程中,各个学科的交叉耦合问题越来越突出,采用多学科分析技术是提高车辆综合性能的必要手段。传统的多学科分析是一种弱耦合技术,不同学科之间只是简单的信息交互,没有求解器层面的耦合,因而难以完全表达不同学科之间的相互影响关系。此外,在车辆性能集成过程中,供应商为保护自身的核心技术,不会把子模型以“白箱”(所有结构特征均开放)的方式完全提供给主机厂,给整车性能集成带来困难。因此,需要探索一种强耦合算法,使不同学科在求解器层面进行耦合,同时每个子模型仅需提供界面上的力与运动信息,实现“分而治之”的多学科强耦合分析。     

Integrated fault detection and diagnosis system for longitudinal control of an autonomous all-terrain vehicle (ATV)

This paper presents a fault detection and diagnosis (FDD) method to enhance the reliability and safety for longitudinal control of an autonomous all-terrain vehicle (ATV). An integrated approach using decentralized and centralized FDD is proposed to optimize the tradeoff between sensitivity and robustness. While the decentralized approach is suitable for detecting faults in actuators and sensors directly connected to a single processor, it is sensitive to noises and disturbances and thus may result in false alarms. On the other hand, the centralized approach is based on information communicated between multiple processors, and it detects and diagnoses faults through analyzing concurrent computations of multiple hardware modules. However, its performance is still limited to isolating faults specifically in terms of components in the single hardware. To incorporate the advantages of both FDD approaches, a two-layered structure integrating both decentralized and centralized FDD is proposed and allows us to perform more robust fault detection as well as more detailed fault isolation. Finally, the proposed method is validated experimentally via field tests of an ATV.     

天津市内停车难原因剖析及对策研究

随着天津市机动车保有量逐年上升,停车位紧张,停车难已成为困扰天津市民有车一族的突出问题。基于对天津市部分停车设施现状的调查走访和对天津市民的问卷调查,了解天津市内停车问题现状,分析得出造成天津市停车难问题的主要原因,并提出了针对性的对策建议。     

分布式仿真环境下动态显示方案及效率研究

在分布式仿真系统中,显示子系统决定了仿真系统的复杂度,同时也影响着仿真系统的效率.本文分析对比不同方式下实现的显示子系统的结构复杂性及其通信量、效率、同步性、技术难度等方面,实际应用证明,基于UDP实现的显示系统在许多方面有优势,能够满足仿真结果多屏同步显示的要求.     

水下智能潜器分布式控制系统设计与实现

分布式控制系统是水下管能潜器的重要部分．本文采用分层控制结构，即执行级、协调级和组织级，实现了潜器的控制系统。文中首先介绍了控制系统的组成，然后分别介绍了执行级采用神经网络实现自适应控制的方法，协调级中实现全局和局部路径规划的方法，以及组织级中基于行为分解的任务规划方法。文中给出了系统的仿真和实验结果。     

A route-based solution algorithm for dynamic user equilibrium assignments

The aim of this study is to establish a method to calculate good quality user equilibrium assignments under time varying conditions. For this purpose, it introduces a dynamic network loading method that can maintain correct flow propagation as well as flow conservation, and it shows a novel route-based solution algorithm. This novel algorithm turns out to be convenient and logically plausible compared to the conventional [Frank, M., Wolfe, P., 1956. An algorithm for quadratic programming. Naval Research Logistics Quarterly 3, 95–110] algorithm, because the former does not require evaluation of an objective function and it finds solutions maintaining correct flow propagation in the time-varying network conditions. The application of novel dynamic network loading method and solution algorithm to test networks shows that we can find high quality dynamic user equilibrium assignment. This is illustrated in an example network using the deterministic queuing model for a link performance function and associating costs and flows in a predictive way in discrete time.     

动车段股道发车列控方案研究

研究了动车段股道发车的列控方案;分析了不同型号车载设备由部分监控转完全监控的机制;提出了所有车载设备均能在动车段股道发车时由部分监控自动转完全监控的实现方法。     

AutoNet数字信息平台及其在舰船上的应用

AutoNet是基于中国发明专利的新型数字信息平台,由于高性能免编程并能简化应用软件编制的特点,将取代RS232、RS485、CAN等计算机通信标准,成为舰船信息监控领域里的新标准。本文介绍了AutoNet的分布数据库高速刷新、平台管理技术、工业以太网等技术原理和技术指标,介绍了AutoNet标准接口的使用方法和设计方法。AutoNet已成功地应用到舰船、工业等领域里几十个工程项目,促进了舰船数字集成平台技术的发展。     

路面施工中小平大不平问题的解决办法

阐述了路面施工中小平大不平问题的解决办法。