基于模型的飞机复杂功能分析方法研究

当前飞机总体设计面临功能复杂,系统交联紧密的问题。针对复杂功能离散事件多、动态性强、耦合度高、建模表述困难的特点,提出一种基于模型与数据定义相结合的分析方法,进行飞机复杂功能解耦设计。该方法通过功能逻辑模型和数据建模,实现对相关系统的架构设计,完成逻辑接口向物理接口的迭代映射,最大限度保证复杂功能的相关系统接口清晰、模块划分合理,有效的提高了系统设计和验证的效率。     

Hover Control of Tail-sitter UAV under Wind Field DisturbanceBased on Improved ADRC

针对尾座式无人机容易受到外界风场扰动和模型不确定性影响的问题,设计了一种外环 PID 与内环自抗扰控制(ADRC)的组合控制算法进行悬停姿态与高度控制,并优化扩张状态观测器(ESO)以解决调参困难的问题。建立用垂向欧拉角定义的天东北坐标系来描述悬停飞行状态,进行数学建模并完成全量运动方程组。在 Matlab/Simulink 软件内搭建基于改进 ADRC 的非线性全量运动方程模型,通过大气紊流模型建立风场。仿真分析在干扰作用下的控制效果。仿真结果表明,改进 ADRC控制算法能够有效抵抗风场干扰,实现稳定的悬停姿态与高度控制。     

基于Solid-Works的齿轮参数化设计

由于Solid-Works2003及以前版本的软件,其标准件图库中没有绘制各种齿轮的功能,本文介绍了在Solid-Works中实现参数化齿轮三维造型的一种方法,应用此方法可以在Solid-Works环境下完成齿轮的参数化三维绘制.     

基于BDI模型的管制员Agent行为建模研究

针对空中交通仿真系统中的管制员Agent建模问题，通过分析管制操作行为特点，采用BDI结构，建立了基于决策树模型的管制规则知识库，设计了慎思型管制员Agent。基于Jadex平台，构建了管制员Agent模型，将由JADE平台建立的航空器Agent和模拟空管自动化系统Agent与Jadex平台建立的管制员Agent进行通信与协调，通过仿真系统构建仿真场景并验证管制员Agent的BDI推理过程，实现了对管制员的日常指挥行为的模拟。实验结果表明，所构建的管制员Agent模型可以顺利进行推理过程并对飞行冲突进行探测与解脱。     

Methods for determining unimpeded aircraft taxiing time and evaluating airport taxiing performance

The objective of this study is to improve the methods of determining unimpeded (nom-inal) taxiing time, which is the reference time used for estimating taxiing delay, a widely accepted performance indicator of airport surface movement. After reviewing existing methods used widely by different air navigation service providers (ANSP), new methods relying on computer software and statistical tools, and econometrics regression models are proposed. Regression models are highly recommended because they require less detailed data and can serve the needs of general per-formance analysis of airport surface operations. The proposed econometrics model outperforms existing ones by introducing more explanatory variables, especially taking aircraft passing and over-passing into the considering of queue length calculation and including runway configuration, ground delay program, and weather factors. The length of the aircraft queue in the taxiway system and the interaction between queues are major contributors to long taxi-out times. The proposed method provides a consistent and more accurate method of calculating taxiing delay and it can be used for ATM-related performance analysis and international comparison.     

A hazard analysis via an improved timed colored petri net with time–space coupling safety constraint

Petri nets are graphical and mathematical tools that are applicable to many systems for modeling, simulation, and analysis. With the emergence of the concept of partitioning in time and space domains proposed in avionics application standard software interface(ARINC 653), it has become difficult to analyze time–space coupling hazards resulting from resource partitioning using classical or advanced Petri nets. In this paper, we propose a time–space coupling safety constraint and an improved timed colored Petri net with imposed time–space coupling safety constraints(TCCP-NET) to fill this requirement gap. Time–space coupling hazard analysis is conducted in three steps: specification modeling, simulation execution, and results analysis. A TCCP-NET is employed to model and analyze integrated modular avionics(IMA), a real-time, safety-critical system. The analysis results are used to verify whether there exist time–space coupling hazards at runtime. The method we propose demonstrates superior modeling of safety-critical real-time systems as it can specify resource allocations in both time and space domains. TCCP-NETs can effectively detect underlying time–space coupling hazards.     

对两种典型非工作储备模型的分析

对两种典型的非工作储备模型进行了深入的分析。对成败型模型的分析得出，当组成单元均为成败型时，非工作储备模型与并联模型等效的结论。对限时型模型的分析，考虑其储备单元的耗损故障机理，则建立相应的数学模型。     

温度测点优化在机床主轴热误差建模中的应用

从理论上分析了机床主轴温度场与热变形的动态特性,证明了机床主轴上最佳温度测点的存在,并通过实验加以论证。采用黄金分割法对主轴最佳温度测点的位置进行优化,并采用最佳温度测点处的温度建立线性函数,精确预报主轴的热伸长量。     

散乱点曲面测量造型技术及其在飞机曲面工装模具设计与制造中的应用研究

 分析研究了利用坐标测量机进行曲面模具数控测量的有关理论和方法。提出了一种基于测量规划、散乱点三角划分和采用Ｂｅｚｉｅｒ三角形插值曲面重建曲面模具实物数学模型的方法。目前，这种重建实物数学模型的方法已经在复杂曲面模具散乱点测量、几何造型和数控加工系统３ＭＳ中得到了应用，较好地解决了航空、航天及汽车工业中一类构型十分复杂、形状和边界极不规则曲面产品的设计与制造     

刚体群点的预测模型

本文讨论了对刚体群点进行动态预测的建模方法，该方法尽可能地保持群点间相互联系的整体性，仅对群点运动中的独立运动因素进行建模，当刚体群点集合中样本点数量很大时，它可以使建模工作量大幅度下降，同时使模型的精度和可靠性得到更好的保证。