Four-body cislunar quasi-periodic orbits and their application to ballistic lunar transfer design

Examining the properties of quasi-periodic orbits provides insight into the Sun-perturbed environment in cislunar space. In this investigation, quasi-periodic trajectories and their properties are explored in the Sun-Earth-Moon four-body problem. Computation and the stability characteristics of families of invariant tori are detailed. Furthermore, this investigation offers a framework for construction of ballistic lunar transfer trajectories in the four-body problem. The framework leverages manifold trajectories to supply a set of initial conditions for construction of periapsis Poincaré maps. Periapsis maps reduce the dimensionality of the space and illuminate solutions of interest as a basis to produce feasible families of transfers. Through a continuation process, families of ballistic transfers and families of transfers that include powered lunar flybys are constructed. Ultimately, these solutions supply an initial guess for transition to the Sun-Earth-Moon ephemeris model.     

地外天体着陆巡视探测自主智能技术进展

以月球、火星和小行星等地外天体着陆巡视探测任务为背景，对自主智能技术的发展现状、应用情况与未来趋势进行了分析研究。回顾了目前国内外地外天体着陆巡视探测任务的实施情况；从导航定位与环境感知、轨迹优化与制导控制、自主探测与路径规划、故障诊断与自主处理等四个方面，阐述了该领域自主智能技术的研究现状，并对未来发展态势进行了展望。     

后缘隔板对充气式机翼翼型气动力影响分析

以充气式机翼为背景,研究了安装后缘隔板充气式翼型的气动特性。以翼型E387为基础生成的钝后缘翼型为研究对象,采用大涡模拟方法对安装中部隔板的充气式翼型进行了流场数值计算,并与未安装隔板的情况进行了对比。总结了后缘中部隔板对充气式翼型气动特性影响的变化规律,为充气式机翼设计提供参考。     

高马赫数V字形钝化前缘平板表面压力特性

针对三维内转式进气道V字形唇口下游面临的严酷压力载荷问题，将唇口简化为V字形钝化前缘平板，在来流马赫数为6的条件下，采用数值模拟结合激波风洞压敏涂料测量方法，研究了半径比R/r = 0 ~ 20（V字形根部倒圆半径R与前缘钝化半径r之比）的平板表面压力演化特性。结果表明，随着R/r增大，V字形钝化前缘产生的三维波系结构发生变化，引起下游平板表面压力演变出4种类型。R/r较小时，V字形钝化前缘激波干扰产生的大范围流动分离，诱导形成了偏离中心线较远的分叉状高压区（Type Ⅰ，分叉型）；随着R/r增大，流动分离减弱，分叉状高压区逐渐消失，由透射激波扫掠壁面所形成的条带状高压和超声速射流对撞所形成的中心线高压区逐渐显露，依次出现过渡型（Type Ⅱ）、严酷型（Type Ⅲ）和渐匀型（Type Ⅳ）压力分布。平板上分叉型和过渡型的压力最大值仅为4.3 ~ 7.2p∞（p∞为来流静压），但V字形钝化前缘处的流场品质恶劣；严酷型的压力最大值，随着射流对撞强度的增强而增大，最高可达19p∞；渐匀型的压力最大值，随着射流对撞强度的减弱，逐渐趋近于二维钝前缘平板产生的压力最大值4p∞。