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A hybrid CMG-RW actuator for rapid retargeting and precision pointing of small satellites.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	A hybrid CMG-RW actuator for rapid retargeting and precision pointing of small satellites./
Author:	Patankar, Kunal Shrikant.
Description:	1 online resource (168 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 77-09(E), Section: B.
Contained By:	Dissertation Abstracts International77-09B(E).
Subject:	Mechanical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781339662237

A hybrid CMG-RW actuator for rapid retargeting and precision pointing of small satellites.
Patankar, Kunal Shrikant.

A hybrid CMG-RW actuator for rapid retargeting and precision pointing of small satellites. - 1 online resource (168 pages)

Source: Dissertation Abstracts International, Volume: 77-09(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

This item is not available from ProQuest Dissertations & Theses.

Spacecraft and spacecraft attitude control have evolved a long way from the dawn of the space era. Due to the miniaturization and advances in the electronics, many applications which were once possible only on larger spacecraft platforms are now possible on much smaller platforms. Many of these applications can benefit from an attitude control system (ACS) which is capable of rapid retargeting and precision pointing. Also, the use of commercial-off-the-shelf (COTS) components can greatly benefit small satellites as it reduces development cost and time. However, use of COTS introduces new challenges to spacecraft attitude control, and new control strategies are required to maximize their utility.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781339662237Subjects--Topical Terms:

557493
Mechanical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

A hybrid CMG-RW actuator for rapid retargeting and precision pointing of small satellites.
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245 1 2 $a A hybrid CMG-RW actuator for rapid retargeting and precision pointing of small satellites.
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500 $a Source: Dissertation Abstracts International, Volume: 77-09(E), Section: B.
500 $a Adviser: Norman Fitz-Coy.
502 $a Thesis (Ph.D.) $c University of Florida $d 2015.
504 $a Includes bibliographical references
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a Spacecraft and spacecraft attitude control have evolved a long way from the dawn of the space era. Due to the miniaturization and advances in the electronics, many applications which were once possible only on larger spacecraft platforms are now possible on much smaller platforms. Many of these applications can benefit from an attitude control system (ACS) which is capable of rapid retargeting and precision pointing. Also, the use of commercial-off-the-shelf (COTS) components can greatly benefit small satellites as it reduces development cost and time. However, use of COTS introduces new challenges to spacecraft attitude control, and new control strategies are required to maximize their utility.
520 $a COTS based control moment gyroscopes (CMGs) can provide significantly larger torque than the similarly sized COTS based reaction wheels (RWs). However, COTS components are typically not designed with the precision required for a CMG based attitude control system and thus it introduces larger torque errors which limits the precision pointing performance. COTS based RWs have better torque accuracy but lower maximum torque, thus limiting rapid reorientation performance. This dissertation addresses this problems by developing a novel hybrid CMG-RW ACS, which uses a cluster of COTS based hybrid control moment gyroscopes (HCMGs) and associated hybrid CMG-RW steering algorithm suitable for the COTS components.
520 $a The hybrid CMG-RW steering algorithm splits the reorientation maneuver into two phases, a rapid retargeting (R2) phase and a precision pointing (P2) phase. Torque amplification of the CMGs is used during R2 phase and direct torque of flywheel motors is used during P2 phase. This allows the use of relatively inaccurate COTS hardware to achieve significantly better pointing performance than traditional CMG based pointing using the same hardware.
520 $a A prototype COTS-based HCMG is also built and data gathered during experimental testing is used for simulations to show the effectiveness of this approach over traditional CMGs.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Mechanical engineering. $3 557493
650 4 $a Aerospace engineering. $3 686400
650 4 $a Robotics. $3 561941
655 7 $a Electronic books. $2 local $3 554714
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710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Florida. $3 845432
773 0 $t Dissertation Abstracts International $g 77-09B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10102519 $z click for full text (PQDT)