对抗仿真中防空导弹微分对策模型研究

针对防空导弹与目标的空间对抗,建立了防空导弹微分对策空间对抗模型,并推算得到了最优策略,运用自适应神经网络评判方法对模型进行求解,通过给定条件下的仿真证明了该算法的有效性,显示了该模型可应用于防空导弹与目标的空间对抗问题。     

实现“中国式”复杂表头的动态报表

数据报表是信息系统的必备功能之一,而实现"中国式"复杂表头的动态报表一直是数据报表的难点,没有得到很好解决,特别是根据用户选择的数据字段,动态组织报表的表头.针对动态组织表头的关键问题,结合Delphi的强大报表功能,实现用户动态选择报表字段,且根据报表字段动态设计报表的表头,设计用户动态选择报表字段窗体和表头动态设计窗体,最后实现复杂表头的动态报表.该解决方案针对性强,技巧性高,具有较强的灵活性和适用性,便于用户理解、操作和使用.     

基于Virtual．Lab的某型减速器建模及仿真

为了预测某型自行火炮减速器的寿命,基于Pro/E实体模型,用Virtual.Lab建立了其虚拟样机模型,提出并简述了动态关联的模型校核验证方法,并利用动态关联法,对所建立的虚拟样机模型进行了验证,确认所建立的减速器虚拟样机符合实际情况,同时该虚拟样机模型通过加载得到了二档速度B级路面下太阳齿轮受到的扭矩,为下一步齿轮的校核打下了基础。     

On optimality of one‐bug‐look‐ahead policies for a software testing model

The optimality of the One‐Bug‐Look‐Ahead (OLA) software release policy proposed by Morali and Soyer ( 15 ) is re‐examined in this paper. A counterexample is constructed to show that OLA is not optimal in general. The optimal stopping approach is then called upon to prove that OLA possesses weaker sense of optimality under conditional monotonicity and the strong sense of optimality holds under a more restrictive sample‐wise monotonicity condition. The NTDS data are analyzed for illustration, and OLA is shown to be robust with respect to model parameters. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007.     

Dynamic order acceptance and capacity planning on a single bottleneck resource

We present a tactical decision model for order acceptance and capacity planning that maximizes the expected profits from accepted orders, allowing for aggregate regular as well as nonregular capacity. The stream of incoming order arrivals is the main source of uncertainty in dynamic order acceptance and the company only has forecasts of the main properties of the future incoming projects. Project proposals arrive sequentially with deterministic interarrival times and a decision on order acceptance and capacity planning needs to be made each time a proposal arrives and its project characteristics are revealed. We apply stochastic dynamic programming to determine a profit threshold for the accept/reject decision as well as to deterministically allocate a single bottleneck resource to the accepted projects, both with an eye on maximizing the expected revenues within the problem horizon. We derive a number of managerial insights based on an analysis of the influence of project and environmental characteristics on optimal project selection and aggregate capacity usage. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

Optimal burn‐in procedure for periodically inspected systems

Burn‐in is a widely used method to improve the quality of products or systems after they have been produced. In this paper, we study burn‐in procedure for a system that is maintained under periodic inspection and perfect repair policy. Assuming that the underlying lifetime distribution of a system has an initially decreasing and/or eventually increasing failure rate function, we derive upper and lower bounds for the optimal burn‐in time, which maximizes the system availability. Furthermore, adopting an age replacement policy, we derive upper and lower bounds for the optimal age parameter of the replacement policy for each fixed burn‐in time and a uniform upper bound for the optimal burn‐in time given the age replacement policy. These results can be used to reduce the numerical work for determining both optimal burn‐in time and optimal replacement policy. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

分级燃烧循环发动机变工况的模糊控制

研究了一种模糊控制方法 ,并用于分级燃烧循环液体火箭发动机变工况过程的反馈控制。仿真研究表明 :在抑制参数抖振方面 ,模糊控制优于一般的变结构控制     

复合材料层合圆柱壳的动力响应与层间应力

采用分层壳理论和厚度方向的二次插值函数推导出正交铺设层合圆柱壳的动力响应方程,并得出简支层合圆柱壳自由振动问题的解.对于给定算例,计算出的自振频率与三维分析的结果吻合良好,说明所推导的二维解具有足够精度.计算了前四阶模态对应的壳中应力.计算结果说明,对于高阶模态,层间应力相对于面内应力的比值远高于低阶模态的对应比值,高的层间正应力是高阶模态导致脱层破坏的主要原因.     

连续动态贝叶斯网络实现多传感器融合跟踪

利用多传感器数据进行目标跟踪,关键是怎样将多传感器的数据合理应用来对系统的状态做出最佳估计。提出应用连续动态贝叶斯网络的方法,结合卡尔曼滤波器模型,实现用多传感器数据进行目标跟踪的方法,并对算法进行了推导和验证。仿真结果证明了提出的多传感器数据互相修正融合滤波方法具有良好的滤波效果,并能够弥补传感器数据缺失和抑制脉冲噪声。     

电流变流体夹心梁的优化控制

电流变流体的流变性质和力学性质在电场里随电场强度的变化而实时地、可逆地发生变化, 这一特点使得它在自适应结构中的应用受到越来越多的重视。电流变流体夹心梁是在两弹性层间夹入一层电流变材料, 通过控制电流变材料屈服前的流变性质和力学性质来达到控制整个复合梁的动态响应。本文通过建立两端简支的电流变流体夹心梁的结构模型, 模拟分析了复合梁的动态响应及不同激励频率下的优化电场。