Accession Number : ADP004719

Title :   Design Evaluation and Field Qualification of a Damping System for an Auxiliary Power Unit,

Corporate Author : DAYTON UNIV OH RESEARCH INST

Personal Author(s) : Drake,M. L.

Report Date : NOV 1984

Pagination or Media Count : 18

Abstract : A turbine engines used to operate an auxiliary power unit was incurring resonant vibration induced fatigue failures in the inlet guide vanes (IGV). Field test data from the IGV's revealed high stress levels at frequencies corresponding to the second bending and second torisional resonances. The operational environment required a damping system to be functional over the temperature range of -50 F and 150 F. The damping system had to survive the high airflow and erosion environment associated with the inlet of the engine and also had to be field installable. A computer aided design procedure was used to develop the required damping design. The final design was proof tested in the laboratory and demonstrated an 86 percent stress reduction. Engine test stress reductions agreed well with the laboratory results. After successful engine test evaluations, a one year field evaluation successfully demonstrated the field installation procedures and the durability of the damping system.

Descriptors :   *DAMPING, *AUXILIARY POWER PLANTS, *INLET GUIDE VANES, GAS TURBINES, COMPUTER AIDED DESIGN, TEST AND EVALUATION, ROOM TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE