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Saturday, July 11, 2020 | History

2 edition of Decoupled control of a long flexible beam in orbit found in the catalog.

Decoupled control of a long flexible beam in orbit

Harold A. Hamer

Decoupled control of a long flexible beam in orbit

by Harold A. Hamer

  • 158 Want to read
  • 27 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

    Subjects:
  • Avionics.,
  • Amplitude modulation.,
  • Artificial satellites -- Orbits.

  • Edition Notes

    StatementHarold A. Hamer and Katherine G. Johnson.
    SeriesNASA technical paper -- 1740.
    ContributionsJohnson, Katherine G., United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., Langley Research Center.
    The Physical Object
    Pagination74 p. :
    Number of Pages74
    ID Numbers
    Open LibraryOL17823249M

    Summary of Orbit Analysis Harmonics OR Sub Harmonics: 1. When you have multi mark on the orbit this mean that the loops are sub harmonics. 2. when it is only one mark and there are many loops then these loops are Harmonics How many harmonic or sub we have: 1. If we have internal loops then the no of harmonics equal N +1 (N is the No of Loops) 2. A so called Diode Orbit (DOR) subsystem, based on novel compensated diode detector technique, was designed to perform beam orbit measurements. This thesis describes the analogue processing channels followed by the digital signal processing of the turn-by-turn data and real-time algorithms. The.

    The status and some recent developments in computational modeling of flexible multibody systems are summarized. Discussion focuses on a number of aspects of flexible multibody dynamics including: modeling of the flexible components, constraint modeling, solution techniques, control strategies, coupled problems, design, and experimental by: This paper presents a finite-element (FE) model of a manipulator with a flexible link and flexible joint as well as embedded PZT actuators and proposes a corrected rebuilt reduced model (CRRM) to make its dynamic characteristics more consistent with reality and facilitate control design. The CRRM considers the holding torque of the manipulator driving motor and eliminates the response Author: Minqiang Shao, Minqiang Shao, Yuming Huang, Vadim V. Silberschmidt.

    Longitudinal beam emittance and space charge References 6 Applications and examples Periodic-envelope FODO matching Betatron resonances Examples of linacs Examples of rings References Appendix Computer resources and their use A-1 A Practical Introduction to Beam Physics and Particle. centre line of the beam. Flexible end-plates Typical flexible end-plate connections about the major and minor axis of a column are shown in Figure These connections consist of a single plate fillet welded to the end of the beam and site bolted to either a supporting column or beam. This connection is relatively inexpensive but has theFile Size: KB.


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Decoupled control of a long flexible beam in orbit by Harold A. Hamer Download PDF EPUB FB2

A study to develop procedures for applying decoupling theory in the control of a long, flexible beam in low Earth orbit was performed. Control involved commanding changes in pitch attitude as well as nulling initial disturbances in the pitch and flexible modes. Control-force requirements as.

Decoupled control of a long flexible beam in orbit (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: Harold A Hamer; Katherine G Johnson; United States.

National Aeronautics and Space Administration. Scientific and Technical Information Branch.; Langley. Johnson, Katherine G.: Decoupled control of a long flexible beam in orbit / (Washington, D.C.: National Aeronautics and Space Administration, Scientific and. Control involved commanding changes in pitch attitude as well as nulling initial disturbances in the pitch and flexible modes.

Control force requirements were analyzed. Also, the effects of parameter uncertainties on the decoupling process were analyzed and were found to be small.

Control involved commanding changes in pitch attitude as well as nulling initial disturbances in the pitch and flexible modes.

Control force requirements were analyzed. Also, the effects of parameter uncertainties on the decoupling process were analyzed and were found to be : K. Johnson and H. Hamer. Decoupled control of a long flexible beam in orbit / By Harold A. Hamer, Katherine G.

Johnson, Langley Research Center. and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch. Abstract. Dec. "Langley Research Center."Includes bibliographical of access: Internet. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Cited by: 1.

The equations of motion of an arbitrary flexible body in orbit were derived. The model includes the effects of gravity with all its higher harmonics.

As a specific example, the motion of a long, slender, uniform beam in circular orbit was modelled. The example considers both the inplane and three dimensional motion of the beam in by: 9. select article Modal control of the planar motion of a long flexible beam in orbit.

In this paper, the three axes maneuver control and vibration suppression of a smart flexible satellite moving in a circular orbit are studied. Active Vibration Control of a Flexible Beam Using a Buckling-Type End Force 25 March | Journal of Dynamic Systems, Measurement, and Control, Vol.No.

2 Equivalent constitutive model-based design of wave-absorbing material system and controllerCited by: control of the on-orbit maneuvering of large and highly flexible structures by free-flying robots. An approach is The approach which is called here a “decoupled Large flexible module Fig.4 Beam-like truss structure module.

Math models were developed for various types of large flexible structures. These models were used to study the uncontrolled dynamic characteristics of the structures in orbit and to devise control concepts in order to control their orientation and geometrical shape.

Reduced order decoupled control of the meter long free free beam were studied. The established rigid-flexible-thermal coupled simulation is performed on a modified generalized-α integrator which solves the set of multidisciplinary governing equations synchronously. For revealing the nonlinear behavior of the rigid-flexible-thermal coupled system, the observed thermally induced vibration and perturbation on the pointing Author: Yaqi Cui, Peng Lan, Haitao Zhou, Zuqing Yu.

observation and control spillover effects caused by residual modes, which could result in poor performance or an unstable system. The present analysis presents techniques which use decoupling theory and state-variable feedback to control the pitch attitude and the flexible-mode amplitudes of a long, thin beam.

The GIOTTO attitude and orbit control and measurement system has a blowdown hydrazine reaction control system with eight thrusters, a star mapper, X beam sun sensors, pencil beam infrared earth sensors operating with a microprocessor based attitude and orbit control electronics.

A new approach to decoupled control of large-scale nonlinear. The control of a dextrous manipulator mounted on a flexible structure is discussed. Using the concept of reaction null space, the manipulator dynamics is decoupled from the base dynamics.

Orbit Air Beams Technology - robust and tough inflatable beams that does not puncture. the beam vibrations. Fig. 4 shows a simulated slew maneuver, in which two kg robots grasp either end of a m long flexible structure.

The robots transport the center of the beam m in the X and Y direction while rotating the structure by 90 degrees. The objective is to transport the structureFile Size: KB. critical dimensions. The flexible stamp presented here is de- signed to deform outside patterned areas and the patterns will be replicated without distortion.

The principle of the flexible stamp is to have imprint ar- eas which are weakly coupled, ideally decoupled, from each other in the direction perpendicular to the wafer plane, but.

powerful, and convenient tool for studying beam dynamics in high-intensity rings. INTRODUCTION High-intensity proton ring beams are characterized by low energy, high intensity, and low loss requirements.

Satisfying the beam-loss requirements necessitates a detailed understanding of beam .beam is described in a referential (x,y,z)-coordinate system with base unit vectors{i,j,k}, the origin O placed on the left end-section, and thex-axis parallel with the cylinder and orientated into the beam File Size: KB.

A review of the control strategy for rigid-flexible macro-micro manipulators is presented. This type of manipulators has great potential applications due to the advantages of high ratio of workspace and volume and fast : Xuan Gao, Zhenyu Hong, Dongsheng Zhang.