蒙特卡罗仿真在飞控系统可靠性评估中的研究

针对现代战斗机大多采用多控制面结构,导致飞控系统变得越来越复杂,传统的可靠性分析方法变得很难实现的现状,提出了运用蒙特卡罗法研究飞控系统可靠性仿真技术,为评估飞控系统可靠性提供了一种新方法,方法不仅可得到传统的性能指标而且能得到动态的仿真结果,为设计飞控系统提供了动态参数.给出了蒙特卡罗仿真步骤和算法,在仿真中考虑到了多种影响因素,更真切地模拟飞控系统的工作环境,结合实验数据进行仿真,验证了蒙特卡罗仿真在飞控系统可靠性评估中的可用性.     

基于无线射频技术的自救器使用模拟培训数据采集系统

文章介绍了一种基于无线射频技术的自救器使用模拟培训数据采集系统的设计,详细介绍了该系统的软、硬件设计。该系统可在实验室环境下模拟煤矿井下事故时采集"井下作业人员"的心率、体温等生理数据,并以此为依据对井下作业人员进行有针对性的培训。实验结果表明,该系统易于操作,性能稳定,可高效准确地获得被培训人员的生理数据,填补了目前自救器使用模拟培训领域的空白。     

羽状钻孔预抽矿井瓦斯过程的数值模拟研究

合理抽放瓦斯是解决煤矿瓦斯灾害的重要方法之一。文章在分析煤层瓦斯抽放过程机理的基础上,建立了羽状钻孔预抽瓦斯过程的数学模型,并对该模型进行了数值离散,同时采用牛顿-拉夫逊数值方法,将非线性方程组转化为线性方程组最终得以求解。数值模拟程序采用VB6.0编写,模拟了矿井瓦斯羽状钻孔预抽过程。通过矿山瓦斯抽放实际数据验证,羽状钻孔预抽矿井瓦斯过程的数值模拟结果基本反映了真实的瓦斯抽放情况,为进一步研究瓦斯抽放过程的参数优化奠定了基础。     

Analysis of electro‐optical properties of polymer‐stabilized OCB and the application to TFT‐LCDs

Abstract— A 9‐in. full‐color polymer‐stabilized OCB TFT‐LCD with stable bend alignment in the absence of an electric field was developed. The condition of the polymer stabilization, the characteristics of UV‐curable monomers, and their influence on the configurations of the polymer network in the cell were studied. Possible models of the configuration were proposed and their relationship to the electro‐optical properties was analyzed using a novel simulation method considering the distribution of anchoring effects from both alignment surfaces and the polymer network. It was suggested that a good performance such as high contrast ratio and fast response could be expected in the polymer network originating from newly developed monomers composed of multifunctional LC acrylates due to a relatively weak‐anchoring effect and presumably its localization near the alignment surfaces. By using the newly developed monomers under the optimized polymer‐stabilizing process, a high contrast ratio of 250:1 and fast response nearly equal to that of a conventional OCB cell were achieved.     

Computational simulation of Belousov–Zhabotinskii oscillating chemical reaction

The suitability of computational simulation of the Belousov–Zhabotinskii oscillating chemical reaction by differential kinetic methodology for resolving nonlinear multi-component system is demonstrated in this work. According to the Field–KÖrÖs–Noyes mechanism and the Oregonator model, the change of the concentrations of HBrO₂, bromide ion and cerium ion are simulated. The results of computational simulation are consistent with experimental results very well. At the same time, the effect of variables and parameters, especially the rate constant on the oscillation curve, are investigated deeply. A simple method of estimating rate constants is obtained through simulation the concentrations of key components of the system, and then comparison the simulation results with the experimental ones. The reasonable rate constant is also proposed.     

A multi-scale template method for shape detection with bio-medical applications

In this paper we present a novel methodology based on non-parametric deformable prototype templates for reconstructing the outline of a shape from a degraded image. Our method is versatile and fast and has the potential to provide an automatic procedure for classifying pathologies. We test our approach on synthetic and real data from a variety of medical and biological applications. In these studies it is important to reconstruct accurately the shape of the object under investigation from very noisy data. Here we assume that we have some prior knowledge about the object outline represented by a prototype shape. Our procedure deforms this shape by means of non-affine transformations and the contour is reconstructed by minimizing a newly developed objective function that depends on the transformation parameters. We introduce an iterative template deformation procedure in which the scale of the deformation decreases as the algorithm proceeds. We compare our results with those from a Gaussian Mixture Model segmentation and two state-of-the-art Level Set methods. This comparison shows that the proposed procedure performs consistently well on both real and simulated data. As a by-product we develop a new filter that recovers the connectivity of a shape.

“可编程序控制器原理及其应用”课程试验教学软件的研制

本文在原有的TVT-90硬件和软件实验系统基础上,用组态软件实现"可编程序控制器原理及其应用"试验的动态模拟和仿真,在计算机上实现实验过程的动画仿真,使学生在实验过程中可以进行与生产过程的交互模拟,反复验证自己的程序设计过程是否正确,并且理解真实的生产装置的控制过程。     

基于投影匹配的钢坯端面字符快速识别方法

由于高温及复杂光照的干扰等成像环境的影响,钢坯端面字符自动识别存在很多困难,其实时自动识别难度大。现存的字符识别方法难以适应实际生产现场的需求。文章提出了一种基于投影匹配的快速识别方法,通过将图象二值化后进行垂直投影,直接将一维投影结果进行模板匹配,降低运算维数。大量的现场实验证明,该方法可有效的减少识别时间,提高生产效率,字符的拒识率和误识率较低,可满足生产线的实时要求。     

嵌入式模糊智能控制系统设计

文章概括了嵌入式模糊控制的基本数学理论基础和重要应用价值,从实践和理论角度全面综述了嵌入式模糊智能控制系统的基本构造和设计特点,说明了嵌入式模糊控制体系设计、仿真、实现的一般规律和方法措施。文章重点阐述了二维SVFC和MISO--MVFC体系的嵌入式过程实现,理论结合实践,列举了一系列典型的具体项目设计实例。文章探讨了嵌入式模糊控制的优势和不足,进一步阐述了如何进行嵌入式模糊控制体系的白适应寻优设计问题。     

Development of Self-Configuring Simulation System for Propelling AAA Fire Control

In this paper, the overall structure design of the Ethernet-based and distributed simulation system for propelling （AAA） fire control is proposed with introducing the concept of system self- configuring pattern. The advantage of this system self-configuring pattern is easy and flexible to configure the modules of the simulation system without doing much more reprogramming work, when the simulation system is needed to add or reduced the modules and simulation computers, and the scale of simulation system is needed to changed. Also the system is structured with standardized and modularized design procedures on the Windows OS platform.