SPACE SHUTTLE MAIN ENGINE TURBOPUMP TRANSDUCER

Abstract

The Space Shuttle Main Engines were required to meet the reusability criteria set by the Space Shuttle program. During development tests, excessive bearing wear was observed in one of the Main Engines Oxygen Turbopumps. A means to monitor the bearing load was devised using the Turbopump’s Bearing Support Cartridge. Strain Gages were bonded to the Cartridge and calibrated for loads up to 3000 lbs. The Strain Gages were then covered with a coating called Refset for operation in a Liquid Oxygen environment. The Turbopump, with the Strain Gaged Cartridge, was installed in a Main Engine and “hot fire” tested twenty-two times. Test data showed excessive bearing loads but with minor changes to the Main Engines, bearing loads were deduced. Use of the Strain Gaged Bearing Cartridge will help the Space Shuttle Main Engines meet the Space Shuttle programs reusability criteria.