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16 August 2001 Performance of a launch and on-orbit isolator
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A recently qualified Honeywell vibration isolation system does two things well. It supports and protects its payload during launch environments, and subsequently provides micro-inch level jitter reduction on-orbit. An elliptical hexapod provides six-degree-of-freedom support and isolation. The fluid-damped D-Strut isolation system maintains its payload optical alignment after vibration and thermal exposure. Vibration tests at one micro-inch input and at one- tenth of an inch input show almost identical damping and isolation responses. The 70-lb test payload was made from wood with an aluminum backbone. The payload provided accurate mounting geometries for the six isolator struts, and precision locations for ten accelerometers and an optical cube. Shock testing, launch-level random vibration, and launch sine vibration were imposed. The system was also subjected to thermal cycling. Functional transmissibility tests were performed before, midway, and after launch environments, at 0.25-g and 2.5-g sine input levels. Honeywell's Matlab Isolator Design Tool predicted transmissibility between 6 degrees-of-freedom inputs and the six rigid body outputs. Another analysis code took these 36 transmissibilities and used optical element transfer functions to calculate an overall jitter number. Finally, 18 measured transmissibility curves from functional tests were fed through the optical jitter code.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jim Boyd, T. Tupper Hyde, Dave Osterberg, and Torey Davis "Performance of a launch and on-orbit isolator", Proc. SPIE 4327, Smart Structures and Materials 2001: Smart Structures and Integrated Systems, (16 August 2001);


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