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MAGNETIC BEARINGS TO REMOVE STICTION AND REDUCE VIBRATIONS IN MOMENTUM WHEELS

Award Information

Agency:
National Aeronautics and Space Administration
Branch:
N/A
Award ID:
16948
Program Year/Program:
1992 / SBIR
Agency Tracking Number:
16948
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
SATCON APPLIED TECHNOLOGY, INC.
1745A West Nursery Rd MS4018 Li, MD -
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 2
Fiscal Year: 1992
Title: MAGNETIC BEARINGS TO REMOVE STICTION AND REDUCE VIBRATIONS IN MOMENTUM WHEELS
Agency: NASA
Contract: N/A
Award Amount: $497,256.00
 

Abstract:

THIS PROJECT ADDRESSES MEANS TO IMPROVE THE OPERATIONAL PERFORMANCE AND LIFETIME OF EXISTING REACTION AND MOMENTUM WHEEL ASSEMBLIES ON SPACECRAFT. INSTRUMENTATION CARRIED ON SPACECRAFT IS BECOMING EVER MORE SENSITIVE AND INTOLERANT TO VIBRATIONS CAUSED BY MASS UNBALANCE ON REACTION-MOMENTUM WHEELS. RESONANT STRUCTURAL MODES OF THE SPACECRAFT CAN CAUSE UNEXPECTED AMPLIFICATION OF THE VIBRATIONS LEADING TO SERIOUS DEGRADATION IN INSTRUMENT PERFORMANCE. STICTION IN THE BALL BEARINGS OF REACTION WHEELS IS AN EVEN MORE SERIOUS PROBLEM ON EXTENDED MISSIONS. STICTION IN THE BEARINGS HAS BEEN SERIOUS ENOUGH TO COMPLETELY DISABLE SOME OF THE GPS SATELLITES. USE OF MAGNETIC BEARINGS ELIMINATES STICTION AND ALLOWS ACTIVE CONTROL IN ORDER TO MINIMIZE FORCES GENERATED BY THE MASS UNBALANCE. BOTH VIBRATION AND STICTION ISSUES ARE ADDRESSED AND A PHASE I PROGRAM IS OUTLINED FOR DESIGNING MAGNETIC BEARINGS AND A CONTROLLER TO ELIMINATE STICTION AND TO MINIMIZE VIBRATIONS IN REACTION/MOMENTUM WHEELS. PHASE II WILL BE TARGETED FOR PROTOTYPE DEVELOPMENT AND EVENTUALLY FLIGHT TESTING. THIS PROJECT ADDRESSES MEANS TO IMPROVE THE OPERATIONAL PERFORMANCE AND LIFETIME OF EXISTING REACTION AND MOMENTUM WHEEL ASSEMBLIES ON SPACECRAFT. INSTRUMENTATION CARRIED ON SPACECRAFT IS BECOMING EVER MORE SENSITIVE AND INTOLERANT TO VIBRATIONS CAUSED BY MASS UNBALANCE ON REACTION-MOMENTUM WHEELS. RESONANT STRUCTURAL MODES OF THE SPACECRAFT CAN CAUSE UNEXPECTED AMPLIFICATION OF THE VIBRATIONS LEADING TO SERIOUS DEGRADATION IN INSTRUMENT PERFORMANCE. STICTION IN THE BALL BEARINGS OF REACTION WHEELS IS AN EVEN MORE SERIOUS PROBLEM ON EXTENDED MISSIONS. STICTION IN THE BEARINGS HAS BEEN SERIOUS ENOUGH TO COMPLETELY DISABLE SOME OF THE GPS SATELLITES. USE OF MAGNETIC BEARINGS ELIMINATES STICTION AND ALLOWS ACTIVE CONTROL IN ORDER TO MINIMIZE FORCES GENERATED BY THE MASS UNBALANCE. BOTH VIBRATION AND STICTION ISSUES ARE ADDRESSED AND A PHASE I PROGRAM IS OUTLINED FOR DESIGNING MAGNETIC BEARINGS AND A CONTROLLER TO ELIMINATE STICTION AND TO MINIMIZE VIBRATIONS IN REACTION/MOMENTUM WHEELS. PHASE II WILL BE TARGETED FOR PROTOTYPE DEVELOPMENT AND EVENTUALLY FLIGHT TESTING.

Principal Investigator:


0

Business Contact:

Small Business Information at Submission:

Satcon Technology Corp.
12 Emily St Cambridge, MA 02139

EIN/Tax ID:
DUNS: N/A
Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No