螺旋桨梢涡卷起数值计算

通过解析公式计算得到面源和面偶的诱导速度,在面偶附近区域,用涡环代替面偶,计算得到螺旋桨的速度场,根据尾涡面必须和当地流体流速相切的原则,修正原来尾涡面的形状,逐步迭代直至尾涡形状收敛,用这种方法预报了三维水翼和螺旋桨的尾涡面的形状和梢涡卷起,与试验结果有较好的一致性。     

脉冲压缩雷达系统分析与仿真研究

基于信号处理工作系统(SPW)仿真平台,对脉压雷达信号处理系统进行了建模与仿真技术研究。建立了脉压雷达信号处理系统的仿真模型,同时,利用仿真技术的优势,对脉压雷达信号处理系统的抗干扰(杂波、干扰和噪声)性能进行了仿真,仿真结果表明该雷达信号处理系统具有一定的抗干扰性能。上述工作为脉压雷达信号处理系统的工作过程描述、方案论证、性能评估和挖潜改造提供了仿真依据及技术支持。     

思想道德修养与法律基础课教学改革探析

《思想道德修养与法律基础》课是高校思想政治理论课课程体系的重要组成部分。为了完善《思想道德修养与法律基础》课的教学,要认真探索改革方案,以科学定位为前提,以更新教学内容为核心,提高教师素质,改进教学方法,完善评价体系。     

地空导弹战术单位指控节点优选算法研究

研究了地空导弹动态组网系统中的战术单位指控节点动态重组算法.讨论了算法建立的思路,分别给出了同构和异构地空导弹武器系统战术单位指控节点优化选择算法.通过复杂度分析,该算法在成员节点较少的情况下是可行的.     

装备信息标准体系结构设计研究

科学设计装备信息标准体系,是我军装备信息化建设的前提和基础.从体系、结构和功能的关系出发,介绍了设计体系结构时应具有的结构化思想,描述了装备信息的特点,着重分析了装备信息标准体系结构设计的5大原则,进而分别采用金字塔型结构、网络型结构和循环型结构3种形式进行装备信息标准体系结构设计,并提出了三维装备信息标准体系结构的设想,为构建装备信息标准体系奠定了理论基础.     

The impact of demand uncertainty on product line design under endogenous substitution

The existing product line design literature devotes little attention to the effect of demand uncertainty. Due to demand uncertainty, the supply‐demand mismatch is inevitable which leads to different degrees of lost sales depending on the configuration of product lines. In this article, we adopt a stylized two‐segment setup with uncertain market sizes and illustrate the interplay between two effects: risk pooling that mitigates the impact of demand uncertainty and market segmentation that facilitates consumer differentiation. Compared to downward substitution, inducing bidirectional substitution through product line decisions including quality levels and prices can yield greater risk pooling effects. However, we show that the additional benefit from the risk pooling effect cannot compensate for the reduced market segmentation effect. We demonstrate that the presence of demand uncertainty can reduce the benefit of market segmentation and therefore the length of product lines in terms of the difference between products. We also propose three heuristics that separate product line and production decisions; each of these heuristics corresponds to one particular form of demand substitution. Our numerical studies indicate that the best of the three heuristics yields performance that is close to optimality. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 143–157, 2015     

Optimal pricing and scheduling control of product shipping

In this article, we seek to understand how a capacity‐constrained seller optimally prices and schedules product shipping to customers who are heterogeneous on willingness to pay (WTP) and willingness to wait (WTW). The capacity‐constrained seller does not observe each customer's WTP and WTW and knows only the aggregate distributions of WTP and WTW. The seller's problem is modeled as an M/M/N_s queueing model with multiclass customers and multidimensional information screening. We contribute to the literature by providing an optimal and efficient algorithm. Furthermore, we numerically find that customers with a larger waiting cost enjoys a higher scheduling priority, but customers with higher valuation do not necessarily get a higher scheduling priority. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 215–227, 2015     

基于主动式轴接地系统的舰船轴频电场抵消方法

为减小轴频电场信号,基于轴频电场产生的机理对主动式轴接地(active shaft grounding,ASG)系统的原理进行了分析,并自主研制了原理样机,完成了实验室的船模试验。试验验证结果表明:所研制的ASG系统能有效地抑制滑环和碳刷接触电阻变化所引起的轴频电场信号,抵消效果可达90%以上。     

多弹联合快速任务规划系统设计

简要分析了多弹联合快速任务规划的作战需求,提出了构建一套满足实时、快速、可视化、通用性要求的多弹联合快速任务规划系统的技术手段,阐述了其支持多种目标、多波次攻击以及多弹种联合任务规划的系统特性,最后介绍了系统的总体框架和软硬件组成。     

三维模型大尺度坐标测量辅助设计与评估方法

针对大尺度产品三维模型坐标测量信息缺乏和面向任务坐标测量结果质量评价困难的问题,引入新一代产品几何量技术规范(GPS),提出了基于CATIA二次开发技术的坐标测量辅助设计方法,设计了CAD与CMM集成的XML数据结构,建立了坐标测量数据的UML模型;实现了符合新一代GPS要求的测量方案脚本化描述,开发了部分数据处理算法;提出了基于Monte Carlo方法的坐标测量不确定度评估方案和流程。基于以上技术开发了基于三维模型的大尺度坐标测量设计与评估系统并应用于飞机装配中的部件位姿测量,结果表明,设计的测量方案能够满足飞机柔性装配对接的要求,验证了上述方法的有效性。