University of Colorado
1.
Chabot, Joshua A.
A Spherical Magnetic Dipole Actuator for Spacecraft Attitude Control.
Degree: MS, Aerospace Engineering Sciences, 2015, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/100 
► Spacecraft generally require multiple attitude control devices to achieve full attitude actuation because of the limited control authority a single, traditional device can provide.…
(more)
▼ Spacecraft generally require multiple attitude control devices to achieve full attitude actuation because of the limited control authority a single, traditional device can provide. This work presents a new momentum-exchange device that has the potential to replace traditional attitude control systems with a single
actuator, in turn providing mass, volume, and power savings. The proposed
actuator consists of a
spherical dipole magnet enclosed in an array of coils that are fixed to the spacecraft body. Excitation of the coils as prescribed by the control law accelerates the dipole magnet in such a manner as to produce a desired reaction torque for orienting the spacecraft. The coils also control the magnet's position inside the spacecraft body via a separate control law, which is necessary because of the non-contact nature of the device. Analytical force and torque models are developed and are used in an attitude regulation maneuver. Simulations conducted so far indicate that full attitude control is possible from a single device despite the axisymmetric field of the magnetic dipole rotor, which was anticipated to cause control issues. Finally, the single
actuator system is compared to a cluster of three reaction wheels, illustrating how this device can provide mass, volume, and power savings.
Advisors/Committee Members: Hanspeter Schaub, Brandon Jones, Jeffrey Parker.
Subjects/Keywords: attitude control; magetic dipole; magnetic bearing; reaction sphere; spherical actuator; Navigation, Guidance, Control and Dynamics; Space Vehicles
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APA (6th Edition):
Chabot, J. A. (2015). A Spherical Magnetic Dipole Actuator for Spacecraft Attitude Control. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/100
Chicago Manual of Style (16th Edition):
Chabot, Joshua A. “A Spherical Magnetic Dipole Actuator for Spacecraft Attitude Control.” 2015. Masters Thesis, University of Colorado. Accessed March 08, 2021.
https://scholar.colorado.edu/asen_gradetds/100.
MLA Handbook (7th Edition):
Chabot, Joshua A. “A Spherical Magnetic Dipole Actuator for Spacecraft Attitude Control.” 2015. Web. 08 Mar 2021.
Vancouver:
Chabot JA. A Spherical Magnetic Dipole Actuator for Spacecraft Attitude Control. [Internet] [Masters thesis]. University of Colorado; 2015. [cited 2021 Mar 08].
Available from: https://scholar.colorado.edu/asen_gradetds/100.
Council of Science Editors:
Chabot JA. A Spherical Magnetic Dipole Actuator for Spacecraft Attitude Control. [Masters Thesis]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/asen_gradetds/100
Université Catholique de Louvain
2.
Galary, Grzegorz.
Finite element modelingof spherical induction actuator.
Degree: 2005, Université Catholique de Louvain
URL: http://hdl.handle.net/2078.1/5027
► The thesis deals with finite element method simulations of the two-degree of freedom spherical induction actuator performed using the 2D and 3D models. In some…
(more)
▼ The thesis deals with finite element method simulations of the two-degree of freedom spherical induction actuator performed using the 2D
and 3D models. In some cases non-linear magnetization curves, rotor movement and existence of higher harmonics are taken into account.
The evolution of the model leading to its simplification is presented. Several rotor structures are tested, namely the one-layer, two-layers
and two-layers-with-teeth rotor. The study of some rotor parameters, i.e. teeth number and size, external and internal layer thickness, in order
to improve the actuator electromechanical conversion and reduce the torque ripple is performed. The influence of the rotor teeth geometrical
form on the electromechanical conversion is shown. General actuator parameters such as the airgap, source current and parameters of the
magnetic material are verified as well. Finally the superiority of the two-layers-with-teeth rotor structure over the one-layer and two-layers structures is confirmed.
(FSA 3) – UCL, 2005
Advisors/Committee Members: UCL - FSA/ELEC - Département d'électricité, Legat, Jean-Didier, Gyselinck, Johan, Dehez, Bruno, Grenier, Damien, Raucent, Benoit, Buyse, Hervé.
Subjects/Keywords: Teeth number; Rotor with teeth; Finite element method; Torque oscillations; Spherical actuator
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APA ·
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CSE |
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APA (6th Edition):
Galary, G. (2005). Finite element modelingof spherical induction actuator. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/5027
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Galary, Grzegorz. “Finite element modelingof spherical induction actuator.” 2005. Thesis, Université Catholique de Louvain. Accessed March 08, 2021.
http://hdl.handle.net/2078.1/5027.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Galary, Grzegorz. “Finite element modelingof spherical induction actuator.” 2005. Web. 08 Mar 2021.
Vancouver:
Galary G. Finite element modelingof spherical induction actuator. [Internet] [Thesis]. Université Catholique de Louvain; 2005. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/2078.1/5027.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Galary G. Finite element modelingof spherical induction actuator. [Thesis]. Université Catholique de Louvain; 2005. Available from: http://hdl.handle.net/2078.1/5027
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université Catholique de Louvain
3.
Dehez, Bruno.
Elaboration et application d'une approche multidisciplinaire pour la conception d'un actionneur électrique à rotor sphérique.
Degree: 2004, Université Catholique de Louvain
URL: http://hdl.handle.net/2078.1/5193
► Depuis ses débuts, la conception des convertisseurs électromécaniques se limitait à l'optimisation, par l'électrotechnicien, de la conversion d'énergie électrique en énergie mécanique. Cette énergie, alors…
(more)
▼ Depuis ses débuts, la conception des convertisseurs électromécaniques se limitait à l'optimisation, par l'électrotechnicien, de la conversion d'énergie électrique en énergie mécanique. Cette énergie, alors fournie sous la forme quasi exclusive d'un mouvement à un seul degré de liberté, le plus souvent rotatif, devait ensuite être adaptée, par les mécaniciens, aux besoins du système à actionner. Aujourd'hui, grâce aux évolutions récentes dans des domaines aussi variés que l'électronique de puissance, l'informatique ou encore la conception et la fabrication assistées par ordinateur, il est devenu possible de concevoir de nouveaux actionneurs directement en fonction des besoins des applications auxquelles ils sont destinés. Ainsi, des actionneurs pouvant posséder plusieurs degrés de liberté, tant en rotation qu'en translation, ont été développés. Dans ce contexte, cette thèse poursuit deux objectifs. Le premier est de proposer une démarche de conception intégrant au mieux les aspects électriques et mécaniques de systèmes électromécaniques tels que ces nouveaux actionneurs. Plus largement, elle a pour vocation de s'appliquer à tous types de problèmes multidisciplinaires où la prise en compte des différentes disciplines et de leurs interactions est indispensable pour assurer les performances globales du produit final. Plus particulièrement, elle est adaptée aux cas de recherches qui, contrairement aux cas de développements, font parfois intervenir des concepts mal maîtrisés. Le second objectif est d'appliquer cette démarche à la conception d'un actionneur électrique dont le rotor, de forme sphérique, est actionné avec un débattement illimit?? selon deux des trois degrés de libertéqu'il possède en rotation. Suivant les différentes étapes constituant cette démarche, divers concepts de solution sont d'abord générés, tant pour les aspects électriques d'actionnement que pour les aspects mécaniques de guidage. Ces concepts sont ensuite caractérisés, via une série de modélisations et d'expérimentations, avant d'être combinés en vue de produire une solution globale, dimensionnée, fabriquée et validée sur un banc d'essai.
From the outset, the design of electromechanical converters was limited to the optimization, by electrical engineers, of the conversion of electrical energy to mechanical energy.
The latter was at that time nearly exclusively provided under the form of single degree of freedom motion, more often rotary, and had to be adapted, by mechanical engineers, to the needs of the system to be actuated.
Today, thanks to recent evolutions in fields as various as power electronics, computer capabilities or computer-aided design and manufacturing (CAD-CAM), it has become possible to design new actuators by taking directly into account the needs of the applications they are intended for. As a result, actuators with several degrees of freedom, both in rotation and in translation, have been developed.
Within this context, this thesis pursues two objectives. The first consists in proposing a new design method integrating as…
Advisors/Committee Members: UCL - FSA/MECA - D??partement de mécanique, Multon, Bernard, Vanhoenacker-Janvier, Danielle, Raucent, Benoît, Grenier, Damien, Legat, Jean-Didier, De Schutter, Joris.
Subjects/Keywords: Conception électromécanique; Electromechanical design; Asynchrone; Asynchronous; Induction; Multi-degree-of-freedom actuator; Spherical rotor
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Dehez, B. (2004). Elaboration et application d'une approche multidisciplinaire pour la conception d'un actionneur électrique à rotor sphérique. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/5193
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dehez, Bruno. “Elaboration et application d'une approche multidisciplinaire pour la conception d'un actionneur électrique à rotor sphérique.” 2004. Thesis, Université Catholique de Louvain. Accessed March 08, 2021.
http://hdl.handle.net/2078.1/5193.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dehez, Bruno. “Elaboration et application d'une approche multidisciplinaire pour la conception d'un actionneur électrique à rotor sphérique.” 2004. Web. 08 Mar 2021.
Vancouver:
Dehez B. Elaboration et application d'une approche multidisciplinaire pour la conception d'un actionneur électrique à rotor sphérique. [Internet] [Thesis]. Université Catholique de Louvain; 2004. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/2078.1/5193.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dehez B. Elaboration et application d'une approche multidisciplinaire pour la conception d'un actionneur électrique à rotor sphérique. [Thesis]. Université Catholique de Louvain; 2004. Available from: http://hdl.handle.net/2078.1/5193
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
4.
Perkins, David A.
Synthesis Techniques for Coupler-Driven Planar and Spherical
Single Degree of Freedom Mechanisms.
Degree: PhD, Mechanical Engineering, 2011, University of Dayton
URL: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1317739251
► This dissertation presents the foundation for the synthesis of coupler-driven single degree of freedom (DOF) planar and spherical mechanisms. A coupler-driver is a kinematic…
(more)
▼ This dissertation presents the foundation for
the synthesis of coupler-driven single degree of freedom (DOF)
planar and
spherical mechanisms. A coupler-driver is a kinematic
chain connected between the fixed link and any floating link of the
mechanism which can be actuated to move the mechanism through the
desired motion. For the scope of this work, the coupler-driver is
arevolute-prismatic-revolute (RPR) chain for planar mechanisms and
a
spherical-prismatic-
spherical (SPS) chain for
spherical and
spatial mechanisms. Coupler-drivers are a little investigated class
of actuation that offer several benefits as alternates to
traditionally operated mechanisms, which are driven by one of their
constituent joints. Although many of the results discussed apply to
general 1 DOF planar and
spherical mechanisms, the planar four-bar
(4R) and
spherical four-bar (s4R) are presented in detail due to
their use as fundamental machine elements. Coupler-drivers are
shown to have several advantages in both the synthesis and
operation of a mechanism. This work seeks to identify these
benefits and demonstrate that coupler-driven mechanisms are a
viable alternative. The coupler-driver may be
synthesized to reduce either the internal loading of the mechanism
or the actuation loads. The former reduces friction in the joints
and the buckling and twisting moments of the links and the latter
allows for a motor with reduced output loads. Secondly, actuation
via an input torque at one of the joints of the mechanism requires
that the associated link continually rotate in one direction over
the motion. If this condition is not met, the mechanism suffers
from a branching defect. As the branch defects of the mechanism do
not affect the coupler-driver, the set of potential solution
mechanisms may increase to include those that were previously
excluded due to this defect. Furthermore, as the use of the
coupler-driver decouples the kinematic synthesis from the
actuator
design, the designer can synthesize a mechanism with a more
desirable kinematic profile and then design an optimized
actuator
for that mechanism. Comparisons of coupler-driven four-bar
mechanisms to traditional four-bars driven by a torque at one of
the joints are conducted for both the
spherical and planar
cases. Finally, a completely general formulation
for the kinematic synthesis of the coupler-driver is presented as
are general concepts for the static analysis and comparison between
coupler- and noncoupler-driven mechanisms. These formulations work
for any single parameter planar or
spherical motion, including
those motions generated by four-bar mechanisms. The set of fixed
and moving pivots of the coupler-driver that may be paired to drive
a moving frame along any given motion are derived, as well as a set
of conditions under which the motion has no potential driving
chains.
Advisors/Committee Members: Murray, Andrew (Committee Chair).
Subjects/Keywords: Mechanical Engineering; Coupler-driver; kinematics; prismatic actuator design; spherical mechanisms; mechanism optimization
…Planar N Position Task . . . . .
2.1.5 The Planar Four-Bar . . . . . . . . .
Spherical… …Instantaneous Axis of Rotation .
2.2.3 Design of Spherical RR Dyads . . .
2.2.4 The Spherical N… …DRIVERS . . . . . . . . . . . . . . . . . . . . .
30
3.1
III.
The Spherical Four-Bar… …3.1.1 The Poles, Instantaneous Centers of Rotation and Actuator Singularity
Points… …Driver . . . . . . . . . . . . . .
Spherical Motions…
Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Perkins, D. A. (2011). Synthesis Techniques for Coupler-Driven Planar and Spherical
Single Degree of Freedom Mechanisms. (Doctoral Dissertation). University of Dayton. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=dayton1317739251
Chicago Manual of Style (16th Edition):
Perkins, David A. “Synthesis Techniques for Coupler-Driven Planar and Spherical
Single Degree of Freedom Mechanisms.” 2011. Doctoral Dissertation, University of Dayton. Accessed March 08, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1317739251.
MLA Handbook (7th Edition):
Perkins, David A. “Synthesis Techniques for Coupler-Driven Planar and Spherical
Single Degree of Freedom Mechanisms.” 2011. Web. 08 Mar 2021.
Vancouver:
Perkins DA. Synthesis Techniques for Coupler-Driven Planar and Spherical
Single Degree of Freedom Mechanisms. [Internet] [Doctoral dissertation]. University of Dayton; 2011. [cited 2021 Mar 08].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1317739251.
Council of Science Editors:
Perkins DA. Synthesis Techniques for Coupler-Driven Planar and Spherical
Single Degree of Freedom Mechanisms. [Doctoral Dissertation]. University of Dayton; 2011. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1317739251
Open Access Theses and Dissertations
