Dynamic modeling and parameter identification of a gun saddle ring

In this study, a theoretical nonlinear dynamic model was established for a saddle ring based on a dynamic force analysis of the launching process and the structure according to contact-impact theory. The ADAMS software was used to build a parameterized dynamic model of the saddle ring. A parameter identification method for the ring was proposed based on the particle swarm optimization algorithm. A loading test was designed and performed several times at different elevation angles. The response histories of the saddle ring with different loads were then obtained. The parameters of the saddle ring dynamic model were identified from statistics generated at a 50° elevation angle to verify the feasibility and accuracy of the proposed method. The actual loading history of the ring at a 70° elevation angle was taken as the model input. The response histories of the ring under these working conditions were obtained through a simulation. The simulation results agreed with the actual response. Thus, the effectiveness and applicability of the proposed dynamic model were verified, and it provides an effective method for modeling saddle rings.     

境外反恐行动的理论研究与实践探索

境外反恐行动在国际上已有大量先例，对于一个境外目标面临恐怖威胁或遭受恐怖袭击的国家，是不容回避的现实问题。通过对境外反恐行动产生的根源、各国境外反恐的对策、采取的方式及其制约因素的综合分析，能够得出有益的启示。反恐怖斗争的严峻现实和发展趋势，要求我们探索境外反恐对策，切实保护国家利益和人民生命财产安全，同时为国际反恐斗争作出应有的贡献。     

用于电压岛式功耗管理的无运放结构高精度电流采样电路

电压岛式的功耗管理在大规模SoC芯片中的应用越来越广泛,由于负载电流是反映功耗最直接的物理量,因此对负载电流的实时、精确采样是对功耗进行精确管理和控制的基础,而低压大电流又是当前大规模芯片的基本特征.在分析了几种常用的电流采样技术的基础之上,提出了一种基于电流镜采样的高精度的电流采样方案,适合于低电源电压供电,并且不需要使用运算放大器,结构简单.基于0.18μm CMOS工艺实现了该电流采样电路,各种条件下的版图模拟结果表明,对于60～1300mA的负载,该电路的采样精度最高可达99.1%,并且自身功耗不超过4mW.利用该电流采样电路,可以对负载电流进行实时有效的高精度侦测,用以作为功耗管理的依据.     

复杂电磁环境下火力指挥控制分析

复杂电磁环境下火力的指挥控制是战役研究的核心问题,运用信息战原理,在信息与火力分析平台上,对舰载导弹防空系统信息与火力联合作战能力的初步试验表明:复杂电磁环境的电子攻击可以使该系统拦截入侵飞机的数量下降达606.45%,幅度与电子攻击强度和导弹击毁概率相关,当导弹击毁概率为0.9时,可以获得最优信息与火力联合作战能力.因此,合理提高舰载导弹防空系统的抗电子攻击能力,优化配置导弹资源,不仅可以提高舰载导弹防空系统信息与火力联合作战能力,还可以开发出基于信息战原理的新战法,为信息与火力装备的投资制定科学决策.     

信道带宽对码相关参考波形算法码跟踪精度的影响

相关文献对码相关参考波形算法码跟踪精度的研究,主要是针对无限信道带宽条件下,仿真分析闸宽参数对码跟踪精度的影响,并未分析信道带宽影响。因此,推导了码相关参考波形算法码跟踪精度表达式,分析信道带宽对码相关参考波形算法跟踪精度的影响并进行仿真验证。结论表明,在无限带宽下,减小闸波宽度可提高码跟踪精度,但是在带限条件下,闸波宽度存在最优值。该结论可用于指导卫星导航接收机的码相关参考波形算法设计。     

无人作战的人机融合：挑战与出路

无人作战对于人和机器两个要素的融合提出了巨大的挑战。一方面，无人作战独特的作战模式和作战环境对于自然人的能力素质构成严峻挑战，高度智能化的作战系统运行速度、海量的数据信息日益挑战人类的反应能力和决策能力，虚拟的、远程的、与现实战场隔绝的作战环境日益挑战人类的心理素质。另一方面，机器的高度智能化虽然有利于更好地发挥潜在的作战能力，但也不可避免地带来战争失控和道德沦丧的风险。破解人机两个维度的挑战，实现人与机器的深度融合，一方面要利用增强技术从物理、生理、心理三个层面加速提高人类的能力素质，另一方面是强化机器人的伦理安全设计，坚守人类对机器人的控制底线，规避机器人失控和战争“非人化”的道德风险。     

Integrated guidance and control of guided projectile with multiple constraints based on fuzzy adaptive and dynamic surface

Based on fuzzy adaptive and dynamic surface (FADS), an integrated guidance and control (IGC) approach was proposed for large caliber naval gun guided projectile, which was robust to target maneuver, canard dynamic characteristics, and multiple constraints, such as impact angle, limited measurement of line of sight (LOS) angle rate and nonlinear saturation of canard deflection. Initially, a strict feedback cascade model of IGC in longitudinal plane was established, and extended state observer (ESO) was designed to estimate LOS angle rate and uncertain disturbances with unknown boundary inside and outside of system, including aerodynamic parameters perturbation, target maneuver and model errors. Secondly, aiming at zeroing LOS angle tracking error and LOS angle rate in finite time, a nonsingular terminal sliding mode (NTSM) was designed with adaptive exponential reaching law. Furthermore, combining with dynamic surface, which prevented the complex differential of virtual control laws, the fuzzy adaptive systems were designed to approximate observation errors of uncertain disturbances and to reduce chatter of control law. Finally, the adaptive Nussbaum gain function was introduced to compensate nonlinear saturation of canard deflection. The LOS angle tracking error and LOS angle rate were convergent in finite time and whole system states were uniform ultimately bounded, rigorously proven by Lyapunov stability theory. Hardware-in-the-loop simulation (HILS) and digital simulation experiments both showed FADS provided guided projectile with good guidance performance while striking targets with different maneuvering forms.     

Exact analysis of (R,s, S) inventory control systems with lost sales and zero lead time

We study an (R, s, S) inventory control policy with stochastic demand, lost sales, zero lead‐time and a target service level to be satisfied. The system is modeled as a discrete time Markov chain for which we present a novel approach to derive exact closed‐form solutions for the limiting distribution of the on‐hand inventory level at the end of a review period, given the reorder level (s) and order‐up‐to level (S). We then establish a relationship between the limiting distributions for adjacent values of the reorder point that is used in an efficient recursive algorithm to determine the optimal parameter values of the (R, s, S) replenishment policy. The algorithm is easy to implement and entails less effort than solving the steady‐state equations for the corresponding Markov model. Point‐of‐use hospital inventory systems share the essential characteristics of the inventory system we model, and a case study using real data from such a system shows that with our approach, optimal policies with significant savings in inventory management effort are easily obtained for a large family of items.     

关于作战指挥艺术与工程化平衡的哲学思考

长期以来,作战指挥艺术是军事学家们的研究重点,随着复杂系统科学等理论的深入研究,一大批高新技术应用到军事领域,作战指挥工程化又成为争论的焦点。本文站在哲学的角度,从矛盾的斗争性和同一性两方面分析了作战指挥艺术和工程化之间的区别与联系,并结合作战指挥规律要求,坚持两点论与重点论相统一,探讨如何把握两者之间的关系。     

基于MAXSIM平台的巡逻战法仿真建模

MAXSIM平台具有良好的二次开发性，通过MAXSIM平台进行战法研究将更好地满足战术战役级的军事仿真需求。目前MAXSIM平台中巡逻战法只具备发现报告对方目标及返港能力、未能列出不同巡逻战法，通过行为编辑器（ BE）编写常用的巡逻战法，完善了MAXSIM平台的行为知识库（ BKB），使水面舰艇具备发现敌方目标后进行追逐、攻击的能力，并提出根据Bezier曲线算法对目标航行轨迹进行预判的追逐方式，对进一步研究巡逻战法的应用具有借鉴意义。