Vladislav Rutkovsky

Nonexciting Control by Orientation of Flexible Space Vehicles

Abstract The interaction of the orientation control moment of a flexible vehicle (FV) with the elastic oscillations in the mechanical structure is considered. With fmite control actuator saturation limits, this interaction can be the cause of instability of the closed-loop system in which the elastic oscillations increase in amplitude to a point ultimately limited by non-linearities in the structure. An approach to circumvent the problem is presented here which is based upon consideration of the resonance interaction of the non-linear controller with the elastic oscillations. This enables the controller parameters to be optimised to minimise the modal excitation. Some digital simulation results are discussed.

Free-flying manipulation robot using for in-orbit assembly of large space structures

In this paper, it is considered a number of tasks that are pertained to control by free-flying space manipulation robot (SR) at the process of large space structures in-orbit assembly. It was introduced SR mathematical model with taking into account of the systems discrete character and using of self-braked drives of the manipulator. It is considered the problem of the SRs reconfiguration with the next recovery of the initial orientation that is necessary for a passage to the regime of payload transportation to the assembly place. The notion of SR configuration “cover” is formulated. Using this notion some conditions of SR safe moving near to a surface of the assembled construction are defined. Alternative approach to the SR control in the mode of handling functioning is suggested. This approach does not require the procedure of a gripper path planning. Efficiency of suggested approach is illustrated at computer simulation of an example.

Postgraduate Education and New Challenges on Stability and Adaptive-Robust Control in Aerospace

Abstract Traditions on postgraduate education in Russia and France are considered. New challenges on stability and adaptive-robust control in aerospace engineering are presented.

Attitude Guidance and Control of Mini-satellites and Free-flying Robots*

Abstract The information mini-satellites (for communication, geodesy, radio- and optoelectronic observation of the Earth et al.) and the space free-flying robots (used for service of manned orbital space stations and for assembling the large space structures) have some principle problems with respect to their spatial attitude guidance and control. In the paper these problems are considered and obtained results are presented.

New Adaptive Algorithm of Flexible Spacecraft Control

A new adaptative algorithm for the system with reference model is proposed. Its operation does not depend on the intensity and spectral composition of the input actions and its realization does not require external disturbances estimation. The proposed algorithm functioning is illustrated in the example of large space structure (LSS) control. It is a new type of large-size spacecraft (space energy stations and large orbiting reflectors). Such an object cannot be inserted into orbit in assembled condition because of its big size. LSS, therefore, is assembled in orbit and it is a discretely evolving structure. As the control object, it is a multi-frequency oscillating system with discretely time-varying parameters and a number of freedom degrees. In the case of large space structure control proposed algorithm was simplified. Nevertheless, the control system of LSS realizes high precision.