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Title: A lightweight high performance dual-axis gimbal for space applications

Abstract

This paper describes the design, development and performance of a lightweight precision gimbal with dual-axis slew capability to be used in a closed-loop optical tracking system at Lawrence Livermore National Laboratory-LLNL. The motivation for the development of this gimbal originates from the need to acquire and accurately localize warm objects (T{approximately}500 K) in a cluttered background. The design of the gimbal is centered around meeting the following performance requirements: pointing accuracy with control < 35 {mu}rad-(1-{omega}); slew capability > 0.2 rad/sec; mechanical weight < 5 kg. These performance requirements are derived by attempting to track a single target from multiple satellites in low Earth orbit using a mid-wave infrared camera. Key components in the gimbal hardware that are essential to meeting the performance objectives include a nickel plated beryllium mirro, an accurate lightweight capacitive pickoff device for angular measurement about the elevation axis, a 16-bit coarse/fine resolver for angular measurement about the azimuth axis, a toroidally wound motor with low hysteresis for providing torque about the azimuth axis, and the selection of beryllium parts to insure high stiffness to weight ratios and more efficient thermal conductivity. Each of these elements are discussed in detail to illustrate the design trades performedmore » to meet the tracking and slewing requirements demanded. Preliminary experimental results are also given for various commanded tracking maneuvers.« less

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
82389
Report Number(s):
UCRL-JC-120745; CONF-950472-8
ON: DE95014395; TRN: 95:005234
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: SPIE international symposium on aerospace/defense sensing and dual-use photonics, Orlando, FL (United States), 17-21 Apr 1995; Other Information: PBD: 5 May 1995
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; OPTICAL EQUIPMENT; ACCURACY; AERIAL MONITORING; BEARINGS; DESIGN; MECHANICAL SHAFTS

Citation Formats

Pines, D J, Hakala, D B, and Malueg, R. A lightweight high performance dual-axis gimbal for space applications. United States: N. p., 1995. Web.
Pines, D J, Hakala, D B, & Malueg, R. A lightweight high performance dual-axis gimbal for space applications. United States.
Pines, D J, Hakala, D B, and Malueg, R. 1995. "A lightweight high performance dual-axis gimbal for space applications". United States. https://www.osti.gov/servlets/purl/82389.
@article{osti_82389,
title = {A lightweight high performance dual-axis gimbal for space applications},
author = {Pines, D J and Hakala, D B and Malueg, R},
abstractNote = {This paper describes the design, development and performance of a lightweight precision gimbal with dual-axis slew capability to be used in a closed-loop optical tracking system at Lawrence Livermore National Laboratory-LLNL. The motivation for the development of this gimbal originates from the need to acquire and accurately localize warm objects (T{approximately}500 K) in a cluttered background. The design of the gimbal is centered around meeting the following performance requirements: pointing accuracy with control < 35 {mu}rad-(1-{omega}); slew capability > 0.2 rad/sec; mechanical weight < 5 kg. These performance requirements are derived by attempting to track a single target from multiple satellites in low Earth orbit using a mid-wave infrared camera. Key components in the gimbal hardware that are essential to meeting the performance objectives include a nickel plated beryllium mirro, an accurate lightweight capacitive pickoff device for angular measurement about the elevation axis, a 16-bit coarse/fine resolver for angular measurement about the azimuth axis, a toroidally wound motor with low hysteresis for providing torque about the azimuth axis, and the selection of beryllium parts to insure high stiffness to weight ratios and more efficient thermal conductivity. Each of these elements are discussed in detail to illustrate the design trades performed to meet the tracking and slewing requirements demanded. Preliminary experimental results are also given for various commanded tracking maneuvers.},
doi = {},
url = {https://www.osti.gov/biblio/82389}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri May 05 00:00:00 EDT 1995},
month = {Fri May 05 00:00:00 EDT 1995}
}

Conference:
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