多媒体数据库在模拟器研制中的应用

以一种训练模拟器的研制为背景,说明多媒体数据库的应用意义,给出了多媒体数据库的生成、检索方法及其在模拟器中的应用．     

飞机飞行控制律多目标优化设计研究

针对传统飞行控制律参数单目标优化设计不能同时满足多控制指标要求,且与飞行品质要求缺乏相关性,物理意义不明确等缺点,提出了一种基于改进NSGA-II算法的飞行控制律多目标优化设计方法。在该算法中提出了一种分化进化策略,使得进化搜索过程中染色体群可以自适应分化为数量和构成动态调整的子群,避免了多染色体子群对局部最优区域的重复搜索,维持染色体的多样性,有效抑制了早熟收敛现象发生。最后,使用改进的NSGA-II算法对某型飞机横航向控制律设计进行数值仿真,结果显示提出算法有效提高控制律优化调参效率,结果满足期望的飞行品质要求。     

平台惯性导航系统仿真器的设计

针对平台惯性导航系统的特点,提出了一种平台惯导仿真器的设计方案,通过对导航系统进行模块分解,建立了主要仿真模型,完成了平台惯导仿真器的开发和实现。仿真结果符合平台惯性导航系统的物理特性,实践证明该仿真器可为导航算法、导航系统滤波器的研究提供仿真支持。     

A platform for initial testing of multiple camouflage patterns

The human visual system is still an important factor in military warfare; military personnel receive training on effective search strategies, and camouflage that can effectively conceal objects and personnel is a key component of a successful integrated survivability strategy. Previous methods of camouflage assessment have, amongst others, used psychophysics to generate distinctiveness metrics. However, the population from which the human observers are drawn is often not well defined, or necessarily appropriate. In this experiment we designed a new platform for testing multiple patterns based on a camouflaged object detection task, and investigate whether trained military observers perform better than civilians. We use a two-alternative forced choice paradigm, with participants searching images of woodland for a replica military helmet displaying Olive Green, Multi Terrain Pattern, US Marine Pattern or, as a conspicuous control, UN Peacekeeper Blue. Our data show that there is no difference in detection performance between the two observer groups but that there are clear differences in the effectiveness of the different helmet colour patterns in a temperate woodland environment. We conclude that when tasks involve very short stimulus presentation times, task-specific training has little effect on the success of target detection and thus this paradigm is particularly suitable for robust estimates of camouflage efficacy.     

飞行控制软件导航仿真模型遥测数据注入仿真

研究了飞行控制软件导航仿真模型遥测数据注入仿真中的一些问题,构造了遥测数据输入序列的误差补偿算法,重建相应的输入序列,使得将它们注入到相应的数字仿真模型进行仿真时,得到的输出与飞行试验中弹上计算机发送的遥测数据相符。     

Research and development of training pistols for laser shooting simulation system

Firearm shooting simulators are effective means for training the personnel in armed forces, police and shooting athletes. Shooter–weapon is a complex biomechanical system, therefore the best training quality is achieved when the process of a weapon shot is reconstructed in a training simulator and its training weapon mimics the (feeling) perception of the real weapon usage. Dynamics of motions of a handgun simulator held in the hand of a shooter by its grip during the shot is analysed theoretically and experimentally. Breech lock mechanism of the simulator is actuated pneumatically by supplying compressed air in pulses from external pressure source. Analysis of the obtained simulation results and experimentally recorded motion parameters of the training weapon body reveals that application of pneumatic drives is a reasonable option to simulate recoil perception of a pistol.     

Formation of explosively formed penetrator with fins and its flight characteristics

The ultimate goal of weapon system employing an explosively formed penetrator (EFP) is to defeat a target at the longest standoff. In order to do this, an EFP must be aerodynamically stable so as to strike the target at a small angle of obliquity, and the decay velocity per meter of EFP must be smaller at extended standoff. As the angle of attack increases, the penetration ability of EFP greatly reduces. The fins improve the EFP aeroballistic characteristics and decrease the flight drag of EFP as well. EFP with fins formed by three-point initiation is presented. The formation of EFP with fins is studied by LS-DYNA, and the aeroballistics is studied through experiment. The experimental results show that the decay velocity per meter of EFP with fins is much smaller than that of normal EFP, and the attitude angle steadily decreases.     

火灾模拟软件FDS场景建模环境的设计

火灾模拟软件FDS是基于控制台的应用程序,场景建模文件需要用文本编辑工具编辑,模拟计算中要回到DOS环境中使用命令形式来调用。为了更加便捷地使用FDS软件,在VC++平台下设计出了Windows下的FDS场景建模环境,设计采用图形用户界面方式。系统结构主要由客户端界面和FDS后台引擎服务端构成,系统通过建立一个线程来开启FDS运算引擎,采用匿名管道技术来重定向FDS的运算步骤信息到用户界面中,使用该系统可以大大提高火灾模拟的效率。     

基于组件开发方法的反潜武器作战系统训练模拟器设计

为了满足海军训练的需求,提高训练的可信度,需要研制逼真度更高的模拟训练设备。为此,利用基于组件的开发方法设计了混合配置的反潜武器作战系统训练模拟系统。该系统不仅包括仿真设备,还包括实装设备。系统将两个独立的结构整合成一个系统,因此需要软件构架的独特设计。讨论了这一混合配置的系统训练模拟器的设计,提出了在实装战术网络和仿真网络之间的独特的系统接口设计,成功支持了训练模拟器的开发。基于组件开发方法的设计和思路对于训练模拟器材的设计具有很好的参考价值。     

基于Powell法的GNSS卫星轨道拟合算法

针对GNSS导航信号模拟源中卫星轨道计算的高精度实时性要求,提出了一种基于Powell最优化理论的卫星轨道拟合算法。该算法将有限点卫星位置拟合问题转化为无约束极小值问题,使用最优化理论求解卫星轨道模型参数,从而可以方便计算任意时刻的卫星速度、加速度等高阶量。算例结果表明计算卫星星历时,位置误差小于1×10-4m,速度误差小于1×10-6m/s,计算量为广播星历直接计算的1/3;计算精密星历时,位置精度在2cm左右,拟合精度较拉格朗日插值算法提高了大约1倍。通过实际应用,充分验证了算法的有效性。