Results 31 to 40 of about 4,185,262 (226)
Advances in Astronomy, 2017 Keeping the flying formation of spacecraft is a key problem which needs to be solved in deep space exploration missions. In this paper, the nonlinear dynamic model of formation flying is established and a series of transformations are carried out on this
He Zhenqi, Zhang Ke, Lv Meibai
doaj +1 more source
IET Control Theory & Applications, 2023 This paper investigates the coordinated attitude control problem with fractional order sliding mode control theory for spacecraft formation flying by considering of unknown disturbance, inertia uncertainty, partial loss of actuators, and communication ...
Fan Wu, Ming Liu, Zhenyu Feng, Xibin Cao
doaj +1 more source
Finite-Time Synchronization Control of Spacecraft Formation With Network-Induced Communication Delay
IEEE Access, 2017 This paper addresses the distributed orbit synchronization control of spacecraft formation flying under an undirected connected graph and in the presence of unknown external disturbances and communication time-delay.
Ruixia Liu, Xibin Cao, Ming Liu
doaj +1 more source
Spacecraft Formation Flying in Eccentric Orbits
JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 2008 Formation flight of spacecraft in eccentric orbits is considered in this paper. Symmetry of the eccentric orbits is assumed in a relative formation orbit, and under this assumption, relations of initial conditions in formation flight are derived. Some characteristic orbits are obtained from these relations, such as an orbit where a deputy spacecraft ...
Yamada, Katsuhiko +3 more
openaire +2 more sources
A robust control approach for the formation flying of multiple spacecraft [PDF]
1999 European Control Conference (ECC), 1999 We present a disturbance rejection mechanism for the formation flying of multiple spacecraft based on a robust control approach in terms of an H ∞ control problem. The corresponding H ∞ control problem is then solved numerically using linear matrix inequalities.
Mehran Mesbahi, Fred Y. Hadaegh
openaire +1 more source
Advanced Materials Technologies, EarlyView.The article overviews past and current efforts on caloric materials and systems, highlighting the contributions of Ames National Laboratory to the field. Solid‐state caloric heat pumping is an innovative method that can be implemented in a wide range of cooling and heating applications.
Agata Czernuszewicz +5 more
wiley +1 more source
Satellite Navigation, 2021 Ionospheric irregularities can adversely affect the performance of Global Navigation Satellite System (GNSS). However, this opens the possibility of using GNSS as an effective ionospheric remote sensing tool.
YuXiang Peng +4 more
doaj +1 more source
Advanced Science, EarlyView.The WTP is a key component of static drainage PEMFCs, enabling cathode water removal and gas sealing through capillary forces. This work investigates the mechanisms governing WTP drainage and sealing performance and develops predictive approaches for WTP design optimization.
Mengdi Guo +3 more
wiley +1 more source
On Novel Adaptive Coordinated Control for Spacecraft Formation: An Adjustable Performance Approach
IEEE Access, 2021 This paper investigates an adaptive coordinated control problem of spacecraft formation flying (SFF) system subject to uncertain mass and external perturbations.
Dangjun Zhao, Kai Jin, Caisheng Wei
doaj +1 more source
Cooperative control with adaptive graph Laplacians for spacecraft formation flying [PDF]
49th IEEE Conference on Decision and Control (CDC), 2010 This paper investigates exact nonlinear dynamics and cooperative control for spacecraft formation flying with Earth oblateness (J 2 perturbation) and atmospheric drag effects. The nonlinear dynamics for chief and deputy motions are derived by using Gauss' variational equation and the Euler-Lagrangian formulation, respectively. The proposed cooperative
Insu Chang +2 more
openaire +3 more sources