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Dynamics Of Tethered Satellite Systems

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Dynamics of Tethered Satellite Systems

Dynamics of Tethered Satellite Systems Book
Author : Anonim
Publisher : Unknown
Release : 2012
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Dynamics of tethered satellite systems

Dynamics of tethered satellite systems Book
Author : James William Woodburn
Publisher : Unknown
Release : 1989
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

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.

Development of a Ground based Test Facility for Studying Reel in Dynamics of Tethered Satellite Systems

Development of a Ground based Test Facility for Studying Reel in Dynamics of Tethered Satellite Systems Book
Author : Anonim
Publisher : Unknown
Release : 2004
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Tethered Satellites offer benefits for the space industry. Several applications are being found which utilize their unique dynamics; from sensing characteristics of the atmosphere to providing a propellantless mode of propulsion. Ground-based experimentation is useful as a cost effective means to develop a thorough understanding of tether dynamics. A number of experiments are required to fully investigate the behavior. After examining a number of experiments previously conducted, a new experiment is devised and tested. The experiment consists of designing a low friction representation of a satellite, the design of a stationary post to be tethered to the satellite representation, choosing an adequate test facility, and developing a means of acquiring data from the experiment. In order to check that the experiment is a useful tool for tether analysis, a mathematical model for the system is developed and then the experimental and mathematical results are compared.

Nonlinear Dynamics and Chaos of Tethered Satellite Systems

Nonlinear Dynamics and Chaos of Tethered Satellite Systems Book
Author : Anonim
Publisher : Unknown
Release : 1997
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Dynamics and Control of Multi body Tethered Satellite Systems microform

Dynamics and Control of Multi body Tethered Satellite Systems  microform  Book
Author : Mehdi Keshmiri
Publisher : National Library of Canada = Bibliothèque nationale du Canada
Release : 1995
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Download Dynamics and Control of Multi body Tethered Satellite Systems microform book written by Mehdi Keshmiri, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Dynamics and Control of Multi body Tethered Satellite Systems

Dynamics and Control of Multi body Tethered Satellite Systems Book
Author : Mehdi Keshmiri
Publisher : Unknown
Release : 1995
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

"Among the external forces, the aerodynamic forces and their effects on the dynamics and stability of the system are given more attention. The free molecular flow model is used to calculate the aerodynamic forces resulting from the material damping of the tethers are considered in this investigation. These forces, which are very difficult to model accurately, are modelled using a viscous damping model." --

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.

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

Free Dynamics of the Shuttle tethered satellite System

Free Dynamics of the Shuttle tethered satellite System Book
Author : Monica Pasca,Università degli studi di Roma "La Sapienza." Dipartimento di ingegneria strutturale e geotecnica
Publisher : Unknown
Release : 1987
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Free Dynamics of the Shuttle tethered satellite System book written by Monica Pasca,Università degli studi di Roma "La Sapienza." Dipartimento di ingegneria strutturale e geotecnica, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Dynamics of a Tethered Satellite System with Two Rigid End bodies

Dynamics of a Tethered Satellite System with Two Rigid End bodies Book
Author : A. Kuhn
Publisher : Unknown
Release : 1994
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Download Dynamics of a Tethered Satellite System with Two Rigid End bodies book written by A. Kuhn, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

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...

Three dimensional Librational Dynamics and Control of Multi body Tethered Satellite Systems

Three dimensional Librational Dynamics and Control of Multi body Tethered Satellite Systems Book
Author : Nasrollah Monshi
Publisher : Unknown
Release : 1992
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

"The first analytical method that is used for the development of reel rate laws is the Liapunov's second method. In this work it is shown that the Hamiltonian can be used as a Liapunov function. A reel rate law is devised that stabilizes the in-plane and out-of-plane librations at the same time, for two-body systems. However, since the resulting motion has some deficiencies, this reel rate law is not extended to multi-body systems." --

Tethered Satellite System Tss Dynamics Assessments and Analysis Tss 1r Post Flight Data Evaluation

Tethered Satellite System  Tss  Dynamics Assessments and Analysis  Tss 1r Post Flight Data Evaluation Book
Author : National Aeronautics and Space Adm Nasa
Publisher : Unknown
Release : 2018-11-06
ISBN : 9781730888588
Language : En, Es, Fr & De

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Book Description :

The purpose of this report is to document the analysis performed on the TSS-1R telemetry data after the flight. These analysis addressed the tether dynamics of TSS-1r. The telemetry data was provided in a CD-ROM format. The data contained on the CD-ROM was selected from available Satellite and orbiter MSID's. Glaese, John R. Unspecified Center...

Nullcline Analysis as a Tethered Satellite Mission Design Tool

Nullcline Analysis as a Tethered Satellite Mission Design Tool Book
Author : Anonim
Publisher : Unknown
Release : 2002
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Tethered satellite systems have been proposed for many space mission applications due to the useful dynamics that can be generated in such systems. For instance, tethered satellite systems can be used to increase the orbital radius of low Earth orbit payloads using angular momentum transfer; another tethered satellite system proposal involves the use of a variable length, spinning tethered system to produce specific levels of artificial gravity in low Earth orbit. Increasing interest in tethered satellite systems necessitates a fundamental understanding of the dynamics of such systems. An analytic method of qualitatively describing the possible dynamics of a tethered satellite system is presented. This analysis is centered on the study of the sets of states at which at least one of the nondimensional time derivatives of the state variables is zero; these sets are known as the nullclines of a system and they bound regions of the phase plane in which tethered satellite behavior is similar. The qualitative analysis of the nullclines provides an explanation for, and suggests the controllability of, many types of tethered satellite behavior. A Tethered Artificial Gravity (TAG) satellite system is used as a canonical tethered system and the results derived are applied to this system. The utility of the described analytical method is demonstrated by using the method to characterize two different tethered satellite missions.

Dynamics of a Multi tethered Satellite System Near the Sun earth Lagrangian Point

Dynamics of a Multi tethered Satellite System Near the Sun earth Lagrangian Point Book
Author : Brian Wong
Publisher : Unknown
Release : 2003
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

"This paper examines the dynamics of a tether connected multi-spacecraft system, arranged in a wheel-spoke configuration, in the vicinity of the L 2 Lagrangian point of the Sun-Earth system. First, the equations of motion of a N-body system are obtained and equilibrium configurations of the system are determined and small motions about one of these configurations are analyzed. Then, a numerical analysis of the free tether libration is carried out for a three-mass case when the system is near L2 and the parent mass is assumed to be in a halo orbit of different sizes. Finally, a set of control goals are defined and a time domain state feedback control system is integrated into the numerical model. The performance of the control system is tested under different conditions." --

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.

The Investigation of Tethered Satellite System Dynamics

The Investigation of Tethered Satellite System Dynamics Book
Author : Anonim
Publisher : Unknown
Release : 1985
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Download The Investigation of Tethered Satellite System Dynamics book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.