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Satellite Tether Systems

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Satellite Tether Systems

Satellite Tether Systems Book
Author : Kalyan K. Mankala
Publisher : Unknown
Release : 2006
ISBN : 9780542720475
Language : En, Es, Fr & De

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Book Description :

Over the last few decades, researchers have realized many potential applications of tethered satellite systems that include atmospheric data collection, placing satellites from low earth orbits into higher orbits, capture of non-functional satellites for service and repair, satellite reboost and deorbiting. The deployment/retrieval dynamics of such systems due to gravity gradient forces is highly nonlinear in nature. Also, due to orbital motion, the longitudinal and transverse motions are coupled. With only boundary control, the tethered satellite system forms a highly underactuated system. In this thesis, we derive and validate the deployment dynamics of such a system following two different basic approaches---Newton's laws and Hamilton's principle. The complexity of the system is studied in an incremental nature using three different models. The problem of controlled deployment/retrieval is approached using a partial feedback linearizing controller. The problem of station keeping is tackled in a more novel way by developing a boundary controller based on the linearization of the infinite dimensional tether system around radial relative equilibrium configuration. Lyapunov function is used to study the stability of the controller on the linearized system. Effectiveness of controllers developed for deployment and station keeping are verified through simulations. We have also studied the dynamics of tethered satellite systems in the presence of electrodynamic forces due to the magnetic field of the earth. We propose a novel method to the control the tether configurations in the presence of electrodynamic forces.

Orbital Injection of the Sedsat Satellite

Orbital Injection of the Sedsat Satellite Book
Author : National Aeronautics and Space Adm Nasa
Publisher : Unknown
Release : 2018-11-17
ISBN : 9781731279316
Language : En, Es, Fr & De

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Book Description :

This report deals with the following topics which are all related to the orbital injection of the SEDSAT satellite: Dynamics and Stability of Tether Oscillations after the First Cut. The dynamics of the tether after the first cut (i.e., without the Shuttle attached to it) is investigated. The tether oscillations with the free end are analyzed in order to assess the stability of the rectilinear configuration in between the two tether cuts; analysis of Unstable Modes. The unstable modes that appear for high libration angles are further investigated in order to determine their occurrences and the possible transition from bound librations to rotations; Orbital Release Strategies for SEDSAT. A parametric analysis of the orbital decay rate of the SEDSAT satellite after the two tether cuts has been carried out as a function of the following free parameters: libration amplitude at the end of deployment, deviation angle from LV at the first cut, and orbital anomaly at the second cut. The values of these parameters that provide a minimum orbital decay rate of the satellite (after the two cuts) have been computed; and Dynamics and Control of SEDSAT. The deployment control law has been modified to cope with the new ejection velocity of the satellite from the Shuttle cargo bay. New reference profiles have been derived as well as new control parameters. Timing errors at the satellite release as a function of the variations of the initial conditions and the tension model parameters have been estimated for the modified control law. Lorenzini, Enrico C. and Gullahorn, Gordon E. and Cosmo, Mario L. and Ruiz, Manuel and Pelaez, Jesus Marshall Space Flight Center TETHERED SATELLITES; DEPLOYMENT; DYNAMIC CONTROL; SPACE SHUTTLE ORBITERS; STABILITY; CONTROL THEORY; LIBRATIONAL MOTION; OSCILLATIONS; ROTATION; DECAY RATES...

The Natural History of Medieval Women

The Natural History of Medieval Women Book
Author : David Herlihy
Publisher : Unknown
Release : 1978
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Dynamics of Tethered Satellite Systems

Dynamics of Tethered Satellite Systems Book
Author : Vladimir S Aslanov,Alexander S Ledkov
Publisher : Elsevier
Release : 2012-10-16
ISBN : 0857096001
Language : En, Es, Fr & De

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Book Description :

Aimed at engineering students and professionals working in the field of mechanics of space flight, this book examines space tether systems – one of the most forward-thinking directions of modern astronautics. The main advantage of this technology is the simplicity, profitability and ecological compatibility: space tethers allow the execution of various manoeuvers in orbit without costs of jet fuel due to the use of gravitational and electromagnetic fields of the Earth. This book will acquaint the reader with the modern state of the space tether’s dynamics, with specific attention on the research projects of the nearest decades. This book presents the most effective mathematical models and the methods used for the analysis and prediction of space tether systems’ motion; attention is also given to the influence of the tether on spacecraft’s motion, to emergencies and chaotic modes. Written by highly qualified experts with practical experience in both the fields of mechanics of space flight, and in the teaching Contains detailed descriptions of mathematical models and methods, and their features, that allow the application of the material of the book to the decision of concrete practical tasks New approaches to the decision of problems of space flight mechanics are offered, and new problems are posed

Command Generation and Control of Momentum Exchange Electrodynamic Reboost Tethered Satellite

Command Generation and Control of Momentum Exchange Electrodynamic Reboost Tethered Satellite Book
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Release : 2018-06-24
ISBN : 9781721802104
Language : En, Es, Fr & De

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Book Description :

The research completed for this NASA Graduate Student Research Program Fellowship sought to enhance the current state-of-the-art dynamic models and control laws for Momentum Exchange Electrodynamic Reboost satellite systems by utilizing command generation, specifically Input Shaping. The precise control of tethered spacecraft with flexible appendages is extremely difficult. The complexity is magnified many times when the satellite must interact with other satellites as in a momentum exchange via a tether. The Momentum Exchange Electronic Reboost Tether (MXER) concept encapsulates all of these challenging tasks [l]. Input Shaping is a command generation technique that allows flexible spacecraft to move without inducing residual vibration [2], limit transient deflection [3] and utilize fuel-efficient actuation [4]. Input shaping is implemented by convolving a sequence of impulses, known as the input shaper, with a desired system command to produce a shaped input that is then used to drive the system. This process is demonstrated in Figure 1. The shaped command is then use to drive the system without residual vibration while meeting many other performance specifications. The completed work developed tether control algorithms for retrieval. A simple model of the tether response has been developed and command shaping was implemented to minimize unwanted dynamics. A model of a flexible electrodynamic tether has been developed to investigate the tether s response during reboost. Command shaping techniques have been developed to eliminate the tether oscillations and reduce the tether s deflection to pre-specified levels during reboost. Additionally, a model for the spin-up of a tethered system was developed. This model was used in determining the parameters for optimization the resulting angular velocity. Robertson, Michael J. Marshall Space Flight Center

The First Mission of the Tethered Satellite System

The First Mission of the Tethered Satellite System Book
Author : Anonim
Publisher : Unknown
Release : 1992
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Tethered Satellite System 2

Tethered Satellite System 2 Book
Author : Anonim
Publisher : Unknown
Release : 1989
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Dynamics of Space Tether Systems

Dynamics of Space Tether Systems Book
Author : Vladimir Vasilʹevich Belet︠s︡kiĭ,Evgeniĭ Mikhaĭlovich Levin,American Astronautical Society
Publisher : Univelt Incorporated
Release : 1993-01-01
ISBN : 9780877033707
Language : En, Es, Fr & De

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Download Dynamics of Space Tether Systems book written by Vladimir Vasilʹevich Belet︠s︡kiĭ,Evgeniĭ Mikhaĭlovich Levin,American Astronautical Society, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Z rich Landesmuseum LM 2799

Z  rich  Landesmuseum  LM 2799 Book
Author : Anonim
Publisher : Unknown
Release : 2021-12-05
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Technology for Large Space Systems

Technology for Large Space Systems Book
Author : Anonim
Publisher : Unknown
Release : 1990
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Space Station Systems

Space Station Systems Book
Author : Anonim
Publisher : Unknown
Release : 1986
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Dynamics of Tethered Space Systems

Dynamics of Tethered Space Systems Book
Author : Hans Troger,A.P. Alpatov,V.V. Beletsky,V.I. Dranovskii,V.S. Khoroshilov,A.V. Pirozhenko,A.E. Zakrzhevskii
Publisher : CRC Press
Release : 2010-04-29
ISBN : 9781439836866
Language : En, Es, Fr & De

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Book Description :

During many of the earliest American and Russian space missions, experiments were performed using cables to connect people and objects to spacecraft in orbit. These attempts generated considerable information about the formation of tethered systems and basic problems with tether orientation and gravity-gradient stabilization. During the 1970s, interest in tethered space systems (TSS) came to the forefront with an international project that involved the hanging of a probe from a low-orbit satellite to collect data on the Earth and its atmosphere. Since that time, TSS has grown to become its own area of research. Dynamics of Tethered Space Systems brings together the work of seven leading researchers working at the forefront of TSS. Together, they provide a brief yet thorough introduction to TSS. Then, combining theory with experimental approaches important to industry, they cover the dynamics of the mechanical, physical, and mathematical modeling approaches involved in tethered satellite deployment. They present several models from the literature, focusing on the simplest but most important system: two satellites in orbit around the Earth. Discussion then expands to cover more complex examples. Along the way, the authors consider a number of important topics, such as energy production resulting from interaction between the system and Earth’s magnetic field and momentum transfer in relation to satellites, microgravity laboratories, and futuristic applications such as the space elevator. They also look at a number of challenges, including those with deployment and energy dissipation. Providing approaches to theoretical models and experimental methods, the text includes a wealth of essential equations and detailed analyses of forces acting on tethered objects in motion. It provides both a starting point for further research and the tools needed to apply that research to the applications of tomorrow.

Digital Satellite Communications Systems and Technologies

Digital Satellite Communications Systems and Technologies Book
Author : A. Nejat Ince
Publisher : Springer Science & Business Media
Release : 2012-12-06
ISBN : 1461535786
Language : En, Es, Fr & De

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Book Description :

Among the space activities of the last three decades satellite communications (SATCOM) has found the widest application in meeting both civil and military communications requirements. Several international, regional and national SATCOM systems of increasing capacity, capability and complexity have been and are being implemented over the years. The latest versions are utilizing such concepts as spot beams, processing transponders in SS-TDMA and operations in different frequency bands including the EHF band. On the military side, the United States of America, the United Kingdom, France and NATO (the North Atlantic Treaty Organisation) have been the only owners and operators of military SATCOM systems in the West. The systems in being and under development use satellites and ground terminals with characteristics which differ from the civilian ones with respect to frequency bands utilised and survivability and interoperability. The SATCOM has given the military users the potential of having much-needed mobility, flexibility and survivability in strategic and tactical communications for land, sea and air operations. It must, however, be said particularly for the military SATCOM systems that they have been evolved in big jumps, both in time and capability, each jump involving the deployment of two or three often specially designed large satellites, large expenses and rather traumatic transition between jumps. Despite these undesirable features these systems did not have the required degree of suevivability and flexibility.

Satellites Tethered Satellite System TSS

Satellites  Tethered Satellite System  TSS  Book
Author : Italy
Publisher : Unknown
Release : 1996
ISBN : 0987650XXX
Language : En, Es, Fr & De

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The First Mission of the Tethered Satellite System

The First Mission of the Tethered Satellite System Book
Author : Anonim
Publisher : Unknown
Release : 1992
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Large Space Structures Systems in the Space Station Era

Large Space Structures   Systems in the Space Station Era Book
Author : Anonim
Publisher : Unknown
Release : 1991
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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Dynamics and Control of Tethered Satellite System

Dynamics and Control of Tethered Satellite System Book
Author : Royce L. Abel
Publisher : Unknown
Release : 2005
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

"Tethered Satellite Systems (TSS) has been an ongoing project around the world for many decades. This study examined the dynamics an dcontrols of tethered satellites. The equations of motion were developed and simulated with no control and small eccentric orbits. A control law was derived by associating the Hamiltonian of the system to a Lyapunov Funciton. This control law was then simulated to demonstrate ability and robustness. The tethered system can be retrieved and deployed in a small number of orbits, and return from a perturbation quickly. Examination of a non thruster controlled system resulted in asymptotic convergence in retrieval and station keeping, but the inplane angle, orbital plane, converged during deployment. Time to complete the phases was similar to out of plane thruster controlled. The maximum eccentricities were found for retrieval and deployment when the system started at the perihelion of the orbit with a 100Km tether. Drag was added to the model because it effects the dynamics when the subsatellite is very close to earth. Most of the effects are seen in the inplane angle. At fully deployed the inplane angle was small. A Lyapunov controller for tether satellites works very well under ideal conditions. Once aerodynamics are included into the model, offsets and oscillations occur because of the new forces that unbalance the system compared to the model without drag"--Abstract.

Technology for Large Space Systems

Technology for Large Space Systems Book
Author : Anonim
Publisher : Unknown
Release : 1984
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Tethered Space Robot

Tethered Space Robot Book
Author : Panfeng Huang,Zhongjie Meng,Jian Guo,Fan Zhang
Publisher : Academic Press
Release : 2017-11-06
ISBN : 0128123109
Language : En, Es, Fr & De

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Book Description :

Tethered Space Robot: Dynamics, Measurement, and Control discusses a novel tethered space robot (TSR) system that contains the space platform, flexible tether and gripper. TSR can capture and remove non-cooperative targets such as space debris. It is the first time the concept has been described in a book, which describes the system and mission design of TSR and then introduces the latest research on pose measurement, dynamics and control. The book covers the TSR system, from principle to applications, including a complete implementing scheme. A useful reference for researchers, engineers and students interested in space robots, OOS and debris removal. Provides for the first time comprehensive coverage of various aspects of tethered space robots (TSR) Presents both fundamental principles and application technologies including pose measurement, dynamics and control Describes some new control techniques, including a coordinated control method for tracking optimal trajectory, coordinated coupling control and coordinated approaching control using mobile tether attachment points

Dynamic Analysis of Space Tether Missions

Dynamic Analysis of Space Tether Missions Book
Author : Evgeniĭ Mikhaĭlovich Levin
Publisher : Univelt Incorporated
Release : 2007-01-01
ISBN : 9780877035374
Language : En, Es, Fr & De

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Book Description :

Download Dynamic Analysis of Space Tether Missions book written by Evgeniĭ Mikhaĭlovich Levin, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.