PD反馈特征结构配置在最优控制问题中的应用

考虑了二阶线性系统的比例微分(PD)反馈特征结构配置问题以及其在最优控制问题中的应用。基于比例微分特征结构配置参数化方法,将二阶线性系统的最优控制问题转化为一个便于求解的有约束条件的极小值问题,并给出了相应的求解算法。三自由度质量弹簧阻尼系统算例及其仿真结果表明所提算法简单、有效。     

Optimizing barge utilization in hinterland container transportation

In hinterland container transportation the use of barges is getting more and more important. We propose a real‐life operational planning problem model from an inland terminal operating company, in which the number of containers shipped per barge is maximized and the number of terminals visited per barge is minimized. This problem is solved with an integer linear program (ILP), yielding strong cost reductions, about 20%, compared to the method used currently in practice. Besides, we develop a heuristic that solves the ILP in two stages. First, it decides for each barge which terminals to visit and second it assigns containers to the barges. This heuristic produces almost always optimal solutions and otherwise near‐optimal solutions. Moreover, the heuristic runs much faster than the ILP, especially for large‐sized instances.     

On the reduction of total‐cost and average‐cost MDPs to discounted MDPs

This article provides conditions under which total‐cost and average‐cost Markov decision processes (MDPs) can be reduced to discounted ones. Results are given for transient total‐cost MDPs with transition rates whose values may be greater than one, as well as for average‐cost MDPs with transition probabilities satisfying the condition that there is a state such that the expected time to reach it is uniformly bounded for all initial states and stationary policies. In particular, these reductions imply sufficient conditions for the validity of optimality equations and the existence of stationary optimal policies for MDPs with undiscounted total cost and average‐cost criteria. When the state and action sets are finite, these reductions lead to linear programming formulations and complexity estimates for MDPs under the aforementioned criteria.© 2017 Wiley Periodicals, Inc. Naval Research Logistics 66:38–56, 2019     

基于预定作业周期的航母作战部署调度研究

为科学筹划航母作战部署调度,优化航母作战兵力的运用,对航母作战部署调度问题进行建模研究。介绍航母预定作业周期,重点阐述航母综合训练期、维修保障期和人员/作战节奏等相关内容;在此基础上,分析航母作战部署调度的约束条件,在满足对作战区域有效时间覆盖条件下,以最小化航母作战兵力数量为目标函数,构建航母作战部署调度优化模型,并通过实例进行验证。结果表明,该模型是有效、实用的,可为科学决策航母作战部署调度提供依据和方法。     

Mathematical formulation and heuristic algorithm for the block relocation and loading problem

This study considers the block relocation and loading problem in container terminals. The optimal loading sequence and relocation location are simultaneously decided on the basis of the desired ship‐bay and initial yard space configuration. An integer linear programming model is developed to minimize the number of relocations in the yard space on the basis of no shifts in the ship bay. The accuracy of the model is tested on small‐scale scenarios by using CPLEX. Considering the problem size in the real world, we present a rule‐based heuristic method that is combined with a mathematical model for the removal, loading, and relocation operations. The influence of rules on algorithm performance is also analyzed, and the heuristic algorithm is compared with different types of algorithms in the literature. The extensive numerical experiments show the efficiency of the proposed heuristic algorithm.     

海洋环境监测平行系统优化融合

多个海洋环境监测系统之间存在的功能冗余导致资源浪费和不必要的资金投入,因此应将各个系统优化融合成有机整体来节约海洋环境监测的资源和成本。将海洋环境监测系统按照功能划分为不同的模块,在线性规划融合的基础上引入熵方法,以成本和效能指标为主要对象,通过合理分配,在确保系统优化融合后监测能力不降低的同时,尽量减少建设成本。     

一类极点指标与方差指标约束的满意控制

在将极点配置到关于实轴对称的凸多边形区域时 ,总可以用线性矩阵不等式来描述 ,于是对具有状态稳态方差指标、区域极点指标约束的状态反馈系统 ,可以利用 Matlab- L MI工具箱进行求解反馈增益 ,其仿真结果对结论作了说明。     

线阵CCD在机械微变距离测量中的应用

介绍了一种应用线阵CCD测量柴油机曲轴臂距差的原理和方法 .讨论了光杠杆原理在此测量系统中的应用 ,并结合实际分析了系统产生非线性误差的原因 ,给出了此测量系统非线性的处理方法 .     

模拟线性电路的多故障诊断方法

提出了一种基于电路分析理论的模拟线性电路多故障诊断方法,该方法采用电路分析理论中的替代定理,叠加定理来列写电路的故障诊断方程,利用方程组的相容性原理来进行故障定位,通过计算故障支路的电导增量来完成故障定值.仿真实例表明,这种方法可以提高电路诊断的准确性,并为模拟动态电路的故障诊断提供了理论依据.     

多操纵面战斗机动态控制分配策略研究(英文)

现代先进飞机配置多个操纵面且又冗余,这有利于实现非常规飞行,提高飞机敏捷性,使飞机在机动和故障时有更多的选择,但是同时也导致了飞机控制设计复杂度的增加.为了达到更好的效果,就必须利用控制分配器来充分利用多操纵面的不同带宽.从频率域角度出发,研究了动态控制分配方法,并将其应用于某型先进战斗机的控制分配器设计中,利用鸭翼的频率特性抵消府舱过载,经仿真验证,采用动态控制分配策略时,可以有效地减小座舱过载,同时还可以减小配平阻力,取得了良好的控制效果.