航天器反应式碎片规避动作规划方法

提出一种航天器反应式碎片规避动作规划方法，首先以扰动流体动态系统(IFDS)算法作为动作规划的基础算法，通过其中的总和扰动矩阵对航天器的轨道速度矢量进行修正，实现轨道机动规避；然后，建立基于双延迟深度确定性策略梯度(TD3)深度强化学习算法的反应式动作规划方法，通过TD3在线优化IFDS规划参数，实现对碎片群的“状态-动作”最优、快速规避决策。在此基础上，将优先级经验回放和渐进式学习策略引入该方法中，提升训练效率。最后，仿真结果表明，所提方法可使航天器安全规避多发、突发、动态且形状各异的空间碎片群，且具有较好的实时性。     

Event-triggered and consensus-based attitude tracking alignment for discrete-time multiple spacecraft system exploiting interference

This paper presents a discrete-time attitude control strategy with equi-global practical stabilizability for aligning the attitude of multiple spacecraft to a predesigned configuration according to a time-variant reference. By utilizing the interference of the wireless channel, the communication scheme designed in this paper can save communication resources, amount of computation, and energy proportionally to the number of spacecraft. The exact discrete-time model and approximate discrete-time model of the consensus-based spacecraft tracking system are given. Then the framework for the design of an event-triggered control scheme for the exact discrete-time system via its approximate models is developed, which avoids the periodic actuation, and Zeno behavior is proved to be excluded. Furthermore, the control scheme can handle the presence of the unknown fading channel. Finally, simulation results are presented to demonstrate the effectiveness of the control strategy.     

J312L结构胶空间辐射环境适应性研究

为考察空间辐射环境对J312L结构胶性能的影响，通过电子扫描电镜（SEM）、傅里叶红外光谱（FT-IR）、X射线光电子能谱（XPS）、热重分析仪（TGA）、差示扫描量热仪（DSC）、真空出气和力学性能测试，研究了辐射对J312L结构胶的微观形貌、分子结构、耐热特性、污染特性和力学性能的影响，并对材料辐射老化机制进行了分析。结果表明总剂量辐射对J312L结构胶耐热、真空污染和力学特性影响显著。1.5×10⁹ rad（Si）⁶⁰Co γ 射线辐射后胶黏剂拉伸剪切强度为4.8 MPa，真空总质量损失（TML）为2.36%。与初始相比，玻璃化转变温度和5%热分解温度分别降低了31和84 ℃，表明高剂量作用下胶黏剂以辐射降解为主。     

空间环境对飞行器的影响

文章围绕空间环境对飞行器的影响因素,重点阐述由于辐照剂量以及带电粒子产生空间环境效应对飞行器的影响,最后对飞行器的空间环境效应提出防护建议。