Establishment,simulation and verification of firepower safety control model

On a narrow warship platform, the coordinated use of shipborne weapon systems may cause firepower conflicts, which seriously endangers the ship safety. Meanwhile, with directed-energy weapons mounted on ships, firepower conflicts between weapons become a “high probability event”. Aiming at the problem of firepower safety control, based on the research about the collision probability model of air crafts and space targets and according to the cone of fire model of conventional weapons and directed-energy weapons, this paper solved the firepower conflict probabilities between conventional weapons as well as between conventional weapons and directed-energy weapons respectively using the methods of probability theory, and established the firepower safety control model. Then the calculation of firepower conflict probability was carried out using the dimensionality reduction method based on the equivalent conversion of polar coordinates and the power series method based on Laplace transform. The simulation results revealed that the proposed model and calculation methods are effective and reliable, which can provide theoretical basis and technical support for resolution of firepower conflicts between weapons.     

Adaptive sliding mode control of modular self-reconfigurable spacecraft with time-delay estimation

The reconstruction control of modular self-reconfigurable spacecraft (MSRS) is addressed using an adaptive sliding mode control (ASMC) scheme based on time-delay estimation (TDE) technology. In contrast to the ground, the base of the MSRS is floating when assembled in orbit, resulting in a strong dynamic coupling effect. A TED-based ASMC technique with exponential reaching law is designed to achieve high-precision coordinated control between the spacecraft base and the robotic arm. TDE technology is used by the controller to compensate for coupling terms and uncertainties, while ASMC can augment and improve TDE’s robustness. To suppress TDE errors and eliminate chattering, a new adaptive law is created to modify gain parameters online, ensuring quick dynamic response and high tracking accuracy. The Lyapunov approach shows that the tracking errors are uniformly ultimately bounded (UUB). Finally, the on-orbit assembly process of MSRS is simulated to validate the efficacy of the proposed control scheme. The simulation results show that the proposed control method can accurately complete the target module’s on-orbit assembly, with minimal perturbations to the spacecraft’s attitude. Meanwhile, it has a high level of robustness and can effectively eliminate chattering.     

数值模拟金属靶抗侵彻中的网格密度影响研究

在数值模拟中,有限元网格的数量对计算结果和计算成本都有较大的影响。采用MSC.Patran建立了弹体侵彻金属靶板的计算模型,并利用MSC.Dytran对所建模型进行了计算;结合相关的理论,对不同网格密度划分的有限元模型的计算结果进行了分析,并和实验进行了对比,得到了数值模拟弹体侵彻金属装甲中靶板的最佳网格数量。当网格无因次量μ=0.10时,所得到的数值模拟结果与实际吻合得较好:当厚度方向的网格数取为12个时,文中所采用的模型能较好地模拟弹体对靶板的侵彻效果。     

开流形的曲率与拓扑

应用比较几何的方法研究了完备非紧且具有特定曲率条件的黎曼流形,证明了在一定Pinching条件限制下,流形具有有限拓扑型或者微分同胚于Rn。     

一种新的基于方向导数的二维自适应网格生成算法

结合形变原理及网格迭代思想,利用方向导数计算控制函数,提出一种新的二维空间自适应网格生成算法。数值实验表明,该算法能较好地适应解函数的空间剧烈变化。与其他自适应算法比较,其主要优点是该算法逻辑简单,避免了解网格偏微分方程,节约了网格计算时间。     

几何非线性机械臂有限段传递矩阵法

提出了几何非线性柔性机械臂动力学有限段传递矩阵建模方法,该方法既保留了有限段法自动计及几何非线性和动力刚化的优势,又保留了传递矩阵法建模的方便灵活.算例表明,计算时间与自由度成正比,在已知运动规律的情况下,可直接求得所需的驱动力矩,反之亦然.该方法无需建立系统总体动力学方程,易于工程技术人员掌握,具有一定实用价值.     

基于自校正卡尔曼滤波器的信息融合算法

设计了一种新的基于ARMA模型自校正卡尔曼滤波器及其信息融合的方法,从而避免了经典卡尔曼滤波器需要精确知道系统的模型参数和噪声统计特性的缺点.仿真结果表明,在未知部分模型参数和噪声统计特性的情况下,自校正卡尔曼滤波器的滤波性能非常接近稳态最优卡尔曼滤波器;基于自校正卡尔曼滤波器的信息融合滤波性能接近基于稳态最优卡尔曼滤波器的信息融合滤波性能.     

基于GA的模糊PID控制在质量矩导弹系统上的应用

针对三轴稳定的质量矩导弹姿态控制系统,提出了一种基于遗传算法进行参数寻优的模糊PID控制方法。在建立姿控系统数学模型的基础上,首先设计了姿态控制的优先级函数,然后根据实际的姿态控制系统,设计了遗传算法的性能指标函数和具体的优化策略,最后给出了模糊PID控制器的设计思路。仿真结果说明了该方法的有效性。     

摆动喷管控制精度相关问题讨论

对不同性质的喷管特点以及在控制力作用下喷管的响应特性进行了初步分析;以某防空导弹为例,阐述了摆动喷管在非理想状态下摆动时作动器牵连运动、正负摆角不对称、力臂变化、摆心漂移、位移传递系数精度和预调角对摆角控制的影响;同时说明了负载力矩和伺服机构相关参数影响着摆动喷管位置控制精度。     

基于频率补偿的时延估计方法

由于2个测量站的通道幅相不一致而导致送给时延估计器的两路信号的频率有差异,继而影响时延估计和系统定位精度。首先理论推导了频率差异是如何影响广义相关时延估计的,接着应用频域相关函数对频率差异做准确估计和补偿,最后给出了频差补偿后的时延估计方法。以4种常用通信信号为例,仿真验证了不同信噪比下所提出方法的正确性和有效性。