SPACE SHUTTLE MAIN ENGINE HIGH-PRESSURE FUEL TURBOPUMP ROTORDYNAMIC INSTABILITY PROBLEM.
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The SSME (Space Shuttle Main Engine) HPFTP (High-Pressure Fuel Turbopump) has been subject to a rotordynamic instability problem, characterized by large and damaging subsynchronous whirling motion. The original design of the HPFTP (from a rotordynamic viewpoint) and the evolution of the HPFTP subsynchronous whirl problem are reviewed. The models and analysis which have been developed and utilized to explain the HPFTP instability and improve its stability performance are also reviewed. Elements of the rotordynamic model which are discussed in detail include the following: hydrodynamic forces due to seals, internal rotor damping, bearing and casing support stiffness asymmetry, and casing dynamics.
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