Results 171 to 180 of about 4,477,022 (227)

Pressure chamber fault diagnosis model design based on segmented control and adaptive fuzzy neural network. [PDF]

Sci Rep
Zhang N, Ma Y.
europepmc   +1 more source

Electrochemical discharge etching of porous tungsten emitters for field emission electric propulsion applications. [PDF]

Sci Rep
Seo WG, Kuk JW, Kim H, Kang D, Huh J.
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Flying through an Eruption-associated Magnetic Reconnection Current Sheet in the Solar Corona

Patel R, Niembro T, Xie X, Seaton D, Badman S, Roy S, Rivera Y, Reeves K, Stenborg G, Hess P, West M, Feller A, Hirzberger J, Suarez DO, Solanki S, Strecker H, Valori G.   +16 more
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Spacecraft Formation Flying

, 2012
Spacecraft formation flying is an important application of networked dynamical systems. Attitude control of the spacecraft is an indispensable (many applications place strict requirements on it) and difficult (due to the nonlinear dynamics) problem being studied for decades.
Ziyang Meng, Tao Yang, Karl H. Johansson
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Dynamical Behaviors and Relative Trajectories of the Spacecraft Formation Flying

Aerospace Science and Technology, 2002
To describe relative motion of spacecraft formation flying, the paper presents a method based on relative orbital elements for arbitrary eccentricities. The long time flying conditions are theoretically derived from the relation between relative motion and relative orbital elements.
Yunfeng Gao
exaly   +3 more sources

Adaptive learning control for spacecraft formation flying

Proceedings of the 40th IEEE Conference on Decision and Control (Cat. No.01CH37228), 2002
Considers the problem of spacecraft formation flying in the presence of periodic disturbances. In particular, the nonlinear position dynamics of a follower spacecraft relative to a leader spacecraft are utilized to develop a learning controller which accounts for the periodic disturbances entering the system model.
Hong Wong, Haizhou Pan, Marcio S. de Queiroz, Vikram Kapila   +3 more
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Initialization of distributed spacecraft for precision formation flying

Proceedings of 2003 IEEE Conference on Control Applications, 2003. CCA 2003., 2004
In this paper we present a solution to the formation initialization (FI) problem for N distributed spacecraft located in deep space. Our solution to the FI problem is based on a three-stage sky search procedure that reduces the FI problem for N spacecraft to the simpler problem of initializing a set of sub-formations. We demonstrate our FI algorithm in
Hadaegh, Fred Y., Scharf, Daniel P., Ploen, Scott R.   +2 more
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Spacecraft Formation-Flying in Eccentric Orbits

AIAA Guidance, Navigation, and Control Conference and Exhibit, 2003
In this paper the value and possibility of eccentric orbits in formation flying mission are illustrated in detail. A new set of closed-form formulae that can be used in the formation design of eccentric orbits are derived by linearizing a general solution, which describes relative motion of two spacecraft in arbitrary elliptic orbits of 1 0 < ≤ e . The
Heng Zhang, Lan Sun
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Robust Control of Spacecraft Formation Flying

Journal of Aerospace Engineering, 2007
In this paper, a robust control scheme for two spacecraft in formation subjected to time-variant external disturbances in the space environment was developed. The proposed controller consists of two parts, the first part is for the nominal system without disturbances and the second part is to compensate for effects of system disturbances.
Yan-Ru Hu, Alfred Ng
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