抗辐照通用扩展SiP芯片设计

研究微小卫星综合电子系统的SiP技术实现方法。首先介绍微小卫星综合电子系统结构的组成和采用SiP技术的必要性，然后对综合电子系统进行功能模块划分，并对其通用扩展模块进行详细的SiP设计，包括抗辐照器件选型、原型验证、SiP原理图、基板管壳一体化设计、建模仿真、制造加工、实装测试验证等，通过SiP技术实现了一种星载综合电子系统中通用扩展SiP芯片产品，经过实际验证测试，在保证模块功能和性能的前提下，整体模块重量从230 g减轻到48 g，体积由180 mm?130 mm?17 mm减小到46 mm?46 mm?8 mm，很好地满足了星载功能模块小型化、轻量化设计需求。     

Orbit-attitude-vibration coupled dynamics of tethered solar power satellite

A new orbit-attitude-vibration coupled dynamic model of the tethered solar power satellite (Tethered SPS) is established based on absolute nodal coordinate formulation. The Hamilton’s equation of the system is derived by introducing generalized momentum through Legendre transformation. The correctness of the proposed model is verified by an example. The dynamic characteristics of the Tethered SPS are studied using the symplectic Runge-Kutta method. Simulation results show that the orbital radius and the total energy of the system are well preserved. The attitude of the system is unstable when the mass of the bus system is small. However, the attitude stability is dependent on some other parameters of the system, which requires further studies. It is also found that the average tether force/deformation can be roughly estimated by simplifying the solar panel as a particle. The proposed model can be used to study the orbit-attitude-vibration coupled dynamics and control problems.     

联邦学习安全与隐私保护综述

联邦学习是一种新型的分布式学习框架，它允许在多个参与者之间共享训练数据而不会泄露其数据隐私。但是这种新颖的学习机制仍然可能受到来自各种攻击者的前所未有的安全和隐私威胁。本文主要探讨联邦学习在安全和隐私方面面临的挑战。首先，本文介绍了联邦学习的基本概念和威胁模型，有助于理解其面临的攻击。其次，本文总结了由内部恶意实体发起的3种攻击类型，同时分析了联邦学习体系结构的安全漏洞和隐私漏洞。然后从差分隐私、同态密码系统和安全多方聚合等方面研究了目前最先进的防御方案。最后通过对这些解决方案的总结和比较，进一步讨论了该领域未来的发展方向。     

导流锥结构参数对燃气弹射筒内压力冲击平滑效果影响研究

针对导流锥结构参数对内弹道流场耦合影响问题，基于动态分层动网格技术，构建了含导弹运动和二次燃烧的内弹道数值模型，并验证了模型可靠性。解耦分析了导流锥半径、高度及冲击高度对内弹道流场特性和载荷的影响。结果表明：导流锥的结构直接决定燃气飞溅现象的产生和流场结构的紊乱程度，导流锥的半径、高度和冲击高度的改变会对燃气反射点的位置、二次燃烧的区域以及剧烈程度产生影响;结构优化后的导流锥，较大程度地缓解了冲击现象，获得了较好的平滑效果，筒底压力较实验装置降低了24.5%。     

Local Path Planning and Tracking Control of Vehicle Collision Avoidance System

Automotive collision avoidance technology can effectively avoid the accidents caused by dangerous traffic conditions or driver's manipulation errors.Moreover,it can promote the development of autonomous driving for intelligent vehicle in intelligent transportation.We present a collision avoidance system,which is composed of an evasive trajectory planner and a path following controller.Considering the stability of the vehicle in the conflict-free process,the evasive trajectory planner is designed by polynomial parametric method and optimized by genetic algorithm.The path following controller is proposed to make the car drive along the designed path by controlling the vehicle's lateral movement.Simulation results show that the vehicle with the proposed controller has good stability in the collision process,and it can ensure the vehicle driving in accordance with the planned trajectory at different speeds.The research results can provide a certain basis for the research and development of automotive collision avoidance technology.     

拒绝服务攻击下的Euler Lagrange系统的安全控制

研究了Euler Lagrange系统在拒绝服务(denial of service, DOS)攻击其传感通信通道时的安全控制问题.为减少采样资源消耗，本文设计了基于事件触发机制的控制算法.针对DOS攻击活跃期和休眠期两种情况，设计了Lyapunov函数并证明了所提出的基于事件触发的算法能保证Euler Lagrange系统在DOS攻击下的稳定性.最终通过仿真算例验证了算法的有效性.     

空间推进器制造中的可破坏性工装

由于航天研究的特殊性,其预研型号零件一般批量很小,并且有许多零件不易装夹。选用一种不同于传统专用工装的可破坏性工装,其材料可以是金属的,也可以是非金属的。为保证进度,必须建立预先性的可破坏性工装的数据库。采用可破坏性工装缩短了研制周期,降低了研制成本。     

减小固体火箭外壳板滚弯直线度误差的研究

如何减小固体火箭外壳板滚弯直线度误差是目前火箭生产工艺中的难题,在对最不利实际工况下三轴辊弯板机中心辊进给量沿自身轴线分布规律作系统的分析、计算及研究的基础上,推导出一项箭壳板滚弯直线度误差不等式,并针对此项不等式各参数变化规律,提出几项减小箭壳板滚弯直线度误差的行之有效的措施,可供火箭外壳设计及生产工艺人员参考。     

ERP在航天制造部门的实施初探

ERP是一种先进的生产管理系统,航天产品“小批量、多品种”的生产特点为ERP的实施提出了新的需求。文章介绍了ERP的特点、实施目的并根据航天某小型制造部门的生产特点,提出了实施措施及建议。只要各方协同努力,ERP在航天制造部门是能够成功发挥其应有作用的。