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小型飞翼布局无人机控制律设计与试飞验证
飞翼布局 特征结构配置 控制律设计
2015/7/22
针对无尾飞翼布局的无人机由于取消了水平尾翼和垂直尾翼，导致纵向、横航向的稳定下降，特别是横航向变为静不安定的问题，设计一种小型飞翼布局无人机全流程飞行控制律。以某型飞翼布局飞机的缩比飞机为控制对象，分析该飞机纵向与横航向的气动特性，采用特征结构配置方式，分别对纵向与横航向进行增稳设计。仿真与实际试飞结果表明：该控制律能够很好地跟踪期望的轨迹，并能有有效地抑制侧风扰动，具有良好的工程应用价值。
考虑动态延迟特性的含攻击角度约束的制导律
攻击角度约束 自动驾驶仪的动态延迟 滑模变结构 反步 制导律
2015/7/19
针对打击固定或者缓慢移动目标时带攻击角度约束的制导问题，设计一种考虑导弹自动驾驶仪动态特性的制导律。基于平面内导弹-目标的运动模型，采用滑模变结构和非线性反步控制的方法，将导弹自动驾驶仪的动态延迟特性近似描述为一阶惯性环节，通过高增益的饱和函数，结合改进的开关项系数来消弱滑模抖振的影响，最终使视线角速率和导弹的弹道倾角分别趋于零和期望值。仿真的结果表明，该制导律下导弹能以期望的攻击角度命中目标，有...
基于M-C的高维SEA方法
高维指标 概率密度 SEA 蒙特卡洛
2015/7/10
针对高维指标的系统效能分析(system effectiveness analysis，SEA)方法的应用难点，在系统数值仿真的基础上研究高维性能指标联合概率密度函数拟合，通过将联合概率密度函数应用于计算高维数值积分的蒙特卡洛平均值方法中，得到一种解决SEA中高维性能指标效能分析的蒙特卡罗数值方法，并用实例进行验证评估。结果表明，该方法是有效、实用的，能为SEA方法中涉及高维指标的分析提供一种行之...
考虑动态延迟特性的含攻击角度约束的制导律
攻击角度约束 自动驾驶仪的动态延迟 滑模变结构 反步 制导律
2015/6/23
针对打击固定或者缓慢移动目标时带攻击角度约束的制导问题，设计一种考虑导弹自动驾驶仪动态特性的制导律。基于平面内导弹-目标的运动模型，采用滑模变结构和非线性反步控制的方法，将导弹自动驾驶仪的动态延迟特性近似描述为一阶惯性环节，通过高增益的饱和函数，结合改进的开关项系数来消弱滑模抖振的影响，最终使视线角速率和导弹的弹道倾角分别趋于零和期望值。仿真的结果表明，该制导律下导弹能以期望的攻击角度命中目标，有...
Filtering the Navier Stokes equations with an invertible filter
invertible fi lter Navier Stokes equations
2015/6/23
A filter which completely cuts off the small scales or the high frequency components is not invertible. The
use, on the other hand, of an invertible filter would allow equation (1) ...
Positive Forms and Stability of Linear Time-Delay Systems
Time-Delay Systems Positive Forms and Stability
2015/6/19
We consider the problem of constructing Lyapunov functions for linear differential equations with delays. For such systems it is known that stability implies that there exists a quadratic Lyapunov fun...
Model reduction, optimal prediction, and the Mori-Zwanzig representation of Markov chains
Markov chains Mori-Zwanzig representation
2015/6/19
Model reduction methods from diverse fields---including control, statistical mechanics and economics---aimed at systems that can be represented by Markov chains, are discussed in terms of their genera...
A Computational Approach for Decentralized Control of Turbine Engines
Turbine Engines Decentralized Control
2015/6/19
We propose a heuristic approach to approximately compute the optimal decentralized control for linear systems. The method exploits the notion of quadratic invariance, which characterizes a class of co...
A Dynamic Programming Algorithm for Decentralized Markov Decision Processes with a Broadcast Structure
Decentralized Markov Decision Algorithm
2015/6/19
We give an optimal dynamic programming algorithm to solve a class of finite-horizon decentralized Markov decision processes (MDPs). We consider problems with a broadcast information structure that con...
In this paper, we present a general algebraic framework for analysing decentralized control systems. We consider systems defined by linear fractional functions over a commutative ring. This provides a...
An Explicit Dynamic Programming Solution for a Decentralized Two-Player Optimal Linear-Quadratic Regulator
Programming Solution Two-Player
2015/6/19
We develop optimal controller synthesis algorithms for decentralized control problems, in which individual subsystems are connected over a network. We consider a simple information structure, consisti...
An Explicit State-Space Solution for a Decentralized Two-Player Optimal Linear-Quadratic Regulator
Two-Player State-Space Solution
2015/6/19
We develop controller synthesis algorithms for decentralized control problems, where individual subsystems are connected over a network. We focus on the simplest information structure, consisting of t...
The Phase-Locked Loop (PLL) is a key component of modern electronic communication and control systems. PLL is designed to extract signals from transmission channels. It plays an important role in syst...
Decentralized control has been a large area of open research for over forty years. To cover every aspect of it would require a vast knowledge of applied mathematics and considerable time. Consequently...
Frequency Stability for Distributed Generation Connected through Grid-Tie Inverter
Grid-Tie Inverter Frequency Stability
2015/6/19
Conventional power generation systems rely on the rotating inertia of large synchronous generators to maintain stability in the power balance and frequency control loops. The increasing penetration of...