开拓信息市场 建设“首都信息化工程”

北京是全国政治，经济，文化的中心，更是全国重要的信息中心、在国民经济信息化中起着举足轻重的作用。北京电信作为“首都信息化工程”的重要参与者和建设者，在研究市场，开拓信息，推动计算机互联网络和信息产业的发展主主动出击，做了一些有益的努力和尝试，在促进计算机互联网应用，发展北京信息产业方面，取得了明显的社会效益。     

舰载导弹中的平台惯导系统在动基座上的初始对准

本文论述了在子平台粗对准后，利用载体姿态角度差传递对准法，精确估计子平台的姿态误差角、目标方位误差角和漂移率。载体姿态角度差传递对准法解决了子平台对准中的多个未知数的求解问题，并可自动消除载体姿态角传感器误差对其估计的影响。     

波纹钢屋盖结构板件相关屈曲的试验研究与分析

拱型波纹钢屋盖结构的受力机理异常复杂，波纹、加工制作过程中产生的变形和残余应力等初始缺陷在理论分析中很难精确定量描述。论文对波纹钢屋盖结构梯形截面板组进行了轴心和偏心压力作用下稳定承载能力的试验研究，并与理论结果进行了比较分析，试验与理论结果吻合较好。试验结果表明波纹板组具有较高的局部屈曲承载能力，但几乎无屈曲后承栽能力，与平板板组屈曲特性相比有显著差异。     

惯性平台台体结构实验模态参数识别及灵敏度分析

惯性平台台体的动态特性直接决定着惯性仪表的工作精度和可靠性，模态分析是研究机械系统动态特性的主要方法之一。在概述了实验模态分析理论的基础上，建立了某型号平台台体结构的实验模型，对其进行了实验模态分析。通过对实验结果与有限元计算结果比较，验证了有限元结果较为准确；同时针对结构存在的问题，通过灵敏度分析对结构的动力修改提出了改进意见。     

ORSIS – News and further developments

The paper deals with the simulation program Off Road Systems Interactive Simulation (ORSIS) which is the w,orldwide leading simulation tool for off road driving of wheeled vehicles. Even though the present state of development allows a very realistic simulation of the man–vehicle–terrain system, there is continuous further improvement in the computer program’s detail. Some of the recent innovations integrated into the program are presented in this paper. These examples were chosen in a way that the scope of the further developments can be demonstrated. They represent three main directions of the work carried out: the refining of the tire–soil-model, the integration of new technologies and subsystems into the vehicle model and the improvement of the man–machine–interface especially in driving simulators.The first part of the paper describes a further development of the tire–soil-model. A significant improvement has been achieved to include the influence of slippery surfaces on traction in combination with the tire tread pattern. Results from finite element method (FEM) as well as real measurements were used to build up an approach, which qualitatively allows the influence of the positive–negative portion of the tire tread and the lug height of the tire tread on traction to be considered. The basic idea is very simple and straightforward. Moreover the calculation costs are very low, so the enhancement does not affect real time operation.In the second part a physical model for the central tire inflation system (CTIS) is presented. With this model it is possible to simulate the complete pneumatic system of a CTIS, including the air compressor with an accumulator, the pressure line and the wheel valves. The components are modelled by their physical parameters, so an adaptation to different existing tire-pressure-control-systems (TPC) can be made. The paper presents a short review of the modelling and a first validation using real measurements. Furthermore the influence of each parameter, e.g. the discharge flow of the compressor on the inflation time, is presented.The third part of the paper describes a further development of the visualization system. The ORSIS OpenGL graphic engine was separated from the main ORSIS simulation and can be run on different PCs controlled via a network. It is therefore possible to build up very cheap multi-channel visualization systems using consumer PCs running under LinuX. The fact that ORSIS itself is running on a normal PC allows the assembly of comparatively cheap driving simulators of a high end simulation quality.     

复模态理论在近海平台中的应用

运用复模态理论对考虑海洋平台结构与流体相互作用而引起的非经典阻尼问题进行了理论分析。水中耦合阻尼矩阵运用复模态解法，可以不必近似对角化。推导了随机波浪荷载作用下结构各种反应的能量谱密度函数及结构反应的统计特性，得到了结构反应的均方差和峰值的表达式。针对某典型平台在随机波浪荷载作用下动力反应用复模态法进行了计算并与运用实模态方法多重叠代方法的结果进行了比较。     

自抗扰控制思想在动力调谐陀螺仪力平衡回路中的应用

提出了动力调谐陀螺力平衡回路的自抗扰控制方法(ADRC)。在计算机仿真的基础上搭建陀螺仪力平衡回路硬件电路，利用转台对动力调谐陀螺施加不同扰动，观察在大角度或大角速率等动态条件下ADRC控制技术对陀螺仪的控制效果。     

基于精英集选择进化个体的交互式遗传算法

大种群交互式遗传算法中,评价个体数目的增多加重了用户疲劳,限制了该方法的应用.本文提出一种基于精英集的进化个体选择方法,首先,基于用户评价较高的个体形成精英集;然后,选择与精英集相似的个体类别,在无需用户评价和适应值估计的情况下,直接用于遗传操作;最后,根据种群的进化阶段和个体对精英集的贡献,更新精英集.将其应用于窗帘进化设计系统中,并与已有典型方法比较.结果表明,该方法在提高种群搜索性能的同时,能够有效减轻用户疲劳.     

陀螺稳定平台速度环的离散自抗扰控制

针对陀螺稳定平台在高精度定位下的控制精度受到速度环电机在低速运动时非线性摩擦力影响的问题,文章设计了一种改进策略的自抗扰控制器,将原系统中的非线性摩擦力与电机不同转向时的模型误差统一视为系统扰动,采用扩张状态观测器对这个扰动进行估计,前馈到控制量中进行校正。理论分析了一阶离散系统上扩张状态观测器的推导过程和稳定性条件,并采用遗传算法工具箱对针对平台所设计的扩张状态观测器的参数进行辨识。在仿真实验中,我们首先分析了所设计的扩张状态观测器的开环性能,然后将所设计的自抗扰控制器与实际系统采用的PI控制器的控制精度进行了对比分析。文章为进一步提高陀螺稳定平台的控制性能,提供了一种新的高精度的控制策略。