Abstracts of the Papers Published in Journal of the Japan Society for Aeronautical and Space Sciences (Vol. 70, No. 1, Feb. 2022)

To improve the aerodynamic performance at take-oﬀ and landing ﬂight and coexist with the natural laminar ﬂow wing geom-etry, the capability of the Krueger ﬂap and its ﬂow mechanism were investigated on a JAXA-QSST conﬁguration. Parametric studies using numerical analysis are conducted on variation of the mutual locations between Krueger ﬂap and main wing, and the ﬂap deﬂection angles. The lift-to-drag ratio characteristics are strongly inﬂuenced by the mutual locations and deﬂection angles by eﬀectively controlling the vortex ﬂow over the ﬂaps and main wing. Comparing with the conventional leading-edge ﬂaps, higher lift-to-drag ratio is obtained by the Krueger ﬂap. Because, the vortex lift at the ﬂap and suppression of ﬂow separation at main wing improve the lift-to-drag ratio by the Krueger ﬂap deploying. We applied the LPV (Linear Parameter-Varying) control theory to attitude control for spacecraft. With this method, control stability and control performance can be considered at the same time. This method was applied to attitude tracking problems. In this paper, a method to apply the LPV control theory to the tracking problem of the attitude as well as the angular velocity. We focus on spacecraft with multiple RWs (Reaction Wheels). Using the re-dundancy, an unloading method for the RWs is also described. Numerical simulations assumed a spacecraft with four