Exploring mission planning method for a team of carrier aircraft launching

High-level efficiency and safety are of great significance for improving the fighting capability of an aircraft carrier. One way to enhance efficiency and safety level is to organize the carrier aircraft into combat effectively. This paper studies the mission planning problem for a team of carrier aircraft launching, and a novel distributed mission planning architecture is proposed. The architecture is hierarchical and is comprised of four levels, namely, the input level, the coordination level,the path planning level and the execution level. Realistic constraints in each level of the distributed architecture, such as the vortex flow effect, the crowd effect and the motion of aircraft, are considered in the model. To solve this problem, a distributed path planning algorithm based on the asynchronous planning strategy is developed. The proposed Mission Planning Approach for Carrier Aircraft Launching(MPACAL) is validated using the setups of the Nimitz-class aircraft carrier.Compared to the isolated planning architecture and the centralized planning architecture, the proposed distributed planning architecture has advantages in coordinating the launch tasks not only belonging to the same catapult but also when all different catapults are considered. The proposed MPACAL provides a modeling method for the flight deck operation on aircraft carrier.     

激光雷达对沉潜油探测的探索*

目前,人们对于海洋沉潜油的规律研究及控制水平较低,特别是探测30m深度以内的浅海地区的沉潜油分布信息,其主要原因是缺乏快速有效的探测手段。北京遥测技术研究所开发水下探测激光雷达样机,利用激光在海水中良好的透过特性,用于对水下沉潜油的探测以及对海底等目标的高精度探测。样机完成在水池中进行水下沉潜油的模拟探测试验,对沉潜油样本的典型激光回波信号进行采集分析,并测量模拟探测深度。试验结果基本符合设计预期,为进一步提升激光雷达沉潜油探测能力打下良好基础。     

运载火箭晃动分析中知识模型的构建及应用

为了改变传统方法所实现的运载火箭晃动分析计算程序结构固定、缺乏灵活性、不能根据不同的使用场景自发完成不同计算任务的问题，利用本体理论和方法，将领域知识解决实际问题的过程抽象为决策知识引导应用单元执行的过程模型。根据建立的模型，从晃动分析相关领域知识中剥离出决策节点和应用单元，再通过决策节点重构决策知识，最终实现决策知识引导应用单元完成晃动计算。最后利用本体OWL语言实现决策节点重构决策知识，并开发了基于本体的火箭晃动计算分析软件模块，实现了分析计算知识的公用性、可拓展性和配置灵活性，为快速、智能化的专业分析计算提供借鉴。     

舱体入水工况参数对冲击特性的影响分析

为分析大型舱体返回入水时入水垂直速度等工况参数对其冲击特性的影响,提出一种基于任意拉格朗日欧拉法的舱体入水过程模拟方法,应用球底结构入水问题理论计算方法验证该模拟方法的有效性。通过对不同入水工况的有限元模拟,分析入水垂直速度和入水角度对冲击特性的影响。结果表明本文建立的舱体-流体有限元模型能够有效模拟舱体入水过程,舱体冲击加速度峰值与入水垂直速度成正比,舱体以一定角度入水能够降低入水过程的冲击加速度。研究结果可以为新型舱体的结构设计和入水冲击试验提供指导,从而减少试验次数,缩短开发周期。     

Composition,structure and properties of Venus rocks

Physical and mechanical properties as well as chemical and mineral composition of Venus rocks are discussed on the basic of the data obtained by ground-based radar observations and the experiments in situ.     

具有复合回路飞行控制系统的分析

根据防空导弹飞行控制系统的特点，通过线性二次型的系统设计，推导出了具有最佳反馈的回路结构。按照实际系统的测量状态，构成了复合反馈的飞行控制系统，并对具有复合反馈飞行控制系统的性能的特点进行了分析，同时对回路的设计也进行了讨论。     

Statistical study of inverted-V events: A comparison between experiment and theory

We present a detailed study of the distribution and of the internal structure of the inverted-V electron precipitation commonly detected in the 500 – 2000 km altitude range aboard the AUREOL-3 satellite. These structured precipitations are statistically observed inside the auroral oval with a maximum occurence in the nightside sector. They correspond to primary electron fluxes peaked at energies generally below 10 keV. It is shown that, as predicted by kinetic theories, most inverted-V structures present a clear relationship between the field-aligned current density carried by the 1 – 20 keV primary electrons and the potential drop inferred from particle distribution functions. Furthermore the study demonstrates the existence of strong electron heating, related to the energy gain, when the current density exceeds some threshold of about 1 – 5 μA(m)^?2.     

基于模拟退火算法预测储层参数

讨论了如何将地震资料、测井信息和先验地质知识有机地结合起来预测储层参数，以便揭示储层内部细节和纵横向变化特征。通过将模拟退火算法与人工神经网络相结合，能够解决非线性全局优化问题，勾画出地震信息和储层参数之间的复杂关系，为储层特征描述和储层横向预测提供提供直观、可靠的地层参数剖面一孔隙度、砂泥质百分含量、含水饱和度及渗透率等剖面。     

汽车动力学分析的若干方法探讨和通用程序的介绍

本文是一篇综述性的文章，探讨了５种汽车动力学分析的常用方法，即牛顿－欧拉方法、达朗伯原理、拉格朗日方程、哈米顿正则方程、凯恩方法，并通过一个较为简单的４自由度牵引车－挂车模型说明了各种方法的应用。文中介绍了一些基于多刚体动力学理论可供汽车动力学分析的通用程序。     

THERMAL CALCULATION FOR ANTI-ICERWITH MICRO-EJECTOR

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