智能型减压器试验台的研制

主要介绍了基于硬件设备和软件编程基础上的智能型减压器试验台的设计与应用。测试系统保留了最通常的手动操作系统，增加了全新的自动数据采集系统。试验台可精确、同步测量高入口压力值时的瞬时出口压力值，同时，增加了入口压力控制系统，大大提高了工作效率。     

航天器拦截的输出协方差配置控制

本文通过对航天器拦截问题的分析，确定出系统输出在一定的方差约束下，系统反馈控制的设计目标。通过对［１］中提出的状态协方差控制理论的改造，给出了实现这一设计目标的方法，并提供了说明性的数值例子     

大气层内动能拦截弹的变增益鲁棒姿控系统设计研究

当调度参数快速变化时,基于传统方法设计的系统可能会变得不稳定。针对这个原理缺陷,应用变增益鲁棒控制理论设计参数较快变化的动能拦截弹。首先建立了导弹动力学模型,然后介绍并推证了基于状态反馈的二次H∞性能稳定定理,为了保证闭环系统具有满意的动态性能,引入了闭环极点区域配置技术,最后的仿真表明,该方法具有良好的跟踪切换能力,预期的动态响应能力并可保证系统全局稳定。     

SIMD计算机并行程序性能评价模拟环境的研究与实现

航空、航天领域中有许多问题非常适合并且需要使用并行处理，尤其可以利用ＳＩＭＤ计算机，以提高处理速度，如流场计算，ＦＦＴ，矩阵运算等。但并行程序设计与串行程序设计相比较在实现上要更复杂。有许多影响并行程序效率的复杂因素需要通过实验进行研究，以不断优化算法。本文实现了一个在串行机上运行的适用于ＳＩＭＤ并行程序设计及性能评价的模拟环境—ＳＩＭＤＰ２（ＳＩＭＤＰｒｏｇｒａｍｍｉｎｇａｎｄＰｅｒｆｏｒｍａｎｃｅｅｖａｌｕａｔｉｎｇｅｎｖｉｒｏｎｍｅｎｔ）。该系统为研究者提供了一个廉价而灵活的ＳＩＭＤ计算机的并行算法研究及性能评价的实验环境。在该环境下，用户可分析、优化并行算法及评价所定义的ＳＩＭＤ系统结构     

线性模型的BL估计和BP估计

线性模型最小二乘方估计的改进大致有两条途径：利用验前信息，如贝叶斯估计，改变估计形式，如特征根估计，主成分估计，本文提出ＢＬ（贝叶斯加特征根）估计和ＢＰ（贝叶斯加主成分）估计，实现两类途径的综合，有实用和理论价值。     

限时令牌网络实时特性的关键参数研究

针对限时令牌网络消息传输的实时性问题 ,建立了网络和消息模型 ,指出影响网络实时性能的关键参数 ,并依据线性令牌传递网络 ( L TPB)的消息调度原则推导出其关键参数的数学表达 ,最后 ,对限时令牌网络典型代表光纤分布式数据接口网络 ( FDDI)和 L TPB的实时特性进行了分析比较     

SAR线性调频脉冲干扰抑制研究

首先通过 SAR成像处理介绍线性调频脉冲干扰的原理。然后 ,分析这种干扰信号的特性及检测方法 ,并重点研究利用频域陷波和参数化方法对降斜率处理后的干扰信号进行抑制 ,即通过分数域滤波抑制线性调频脉冲干扰。最后 ,进行计算机仿真 ,给出仿真结果 ,并对仿真结果进行了分析     

Linear stability of ring systems around oblate central masses

In this paper, we consider the stability of a ring of bodies of equal mass uniformly distributed around a large oblate central mass. The purpose of this and previous papers is to shed light on the stability of Saturn’s rings. Previous papers have been limited by the assumptions that (1) all ring bodies are at the same distance from the central body, (2) the central body acts like a point mass (i.e., is a perfect sphere), and (3) the ring bodies all have the same mass and are evenly spaced around the ring. The third limitation is probably the least important; as long as there are a large number of masses and the mass distribution is approximately uniform then the system should behave as a system of equally-spaced, equal-mass bodies. The first main purpose of this paper is to remove the second limitation. But, the paper also aims to address limitation (1). Recent computer simulations of single-ring systems have shown that the threshold for stability, as determined by a linear stability analysis, matches precisely the stability threshold predicted by simulation. In other words, a linear stability analysis while presumably just a mathematical abstraction actually tells us something quite real. Furthermore, simulations of multi-ring systems suggest that instability comes from azimuthal perturbations; small azimuthal changes are more destabilizing that small radial perturbations. Hence, in this paper, we also consider the situation where the central body consists not just of an oblate central mass but also incorporates a flat ring representing in aggregate all ring bodies at radii other than the one under consideration. The central oblate body together with a flat ring is modeled simply by introducing two oblateness terms to the gravitational potential associated with the central mass. The subsequent analysis is almost identical to the case of a single oblateness term. For Saturn, the oblateness of the central mass is six orders of magnitude more significant than the rings at other radii as a destabilizing influence.     

Indirect Radau pseudospectral method for the receding horizon control problem

To solve the receding horizon control (RHC) problem in an online manner, a novel numerical method called the indirect Radau pseudospectral method (IRPM) is proposed in this paper. Based on calculus of variations and the first-order necessary optimality condition, the RHC problem for linear time-varying (LTV) system is transformed into the two-point boundary value problem (TPBVP). The Radau pseudospectral approximation is employed to discretize the TPBVP into well-posed linear algebraic equations. The resulting linear algebraic equations are solved via a matrix partitioning approach afterwards to obtain the optimal feedback control law. For the nonlinear system, the linearization method or the quasi linearization method is employed to approximate the RHC problem with successive linear approximations. Subsequently, each linear problem is solved via the similar method which is used to solve the RHC problem for LTV system. Simulation results of three examples show that the IRPM is of high accuracy and of high compu-tation efficiency to solve the RHC problem and the stability of closed-loop systems is guaranteed.     

轻型飞机燃油油量表指示器的原理设计和定量分析

燃油油量的测量，方法很多。本文首先论述了浮子电位器式传感器与电阻电桥相匹配的测量原理以及计算方法，