Dynamic analysis of a pre-and-post ice impacted bladeThe dynamic characteristics of an engine blade are evaluated under pre-and-post ice impact conditions using the NASA in-house computer code BLASIM. The ice impacts the leading edge of the blade causing severe local damage. The local structural response of the blade due to the ice impact is predicted via a transient response analysis by modeling only a local patch around the impact region. After ice impact, the global geometry of the blade is updated using deformations of the local patch and a free vibration analysis is performed. The effects of ice impact location, ice size and ice velocity on the blade mode shapes and natural frequencies are investigated. The results indicate that basic nature of the mode shapes remains unchanged after impact and that the maximum variation in natural frequencies occurs for the twisting mode of the blade.
Document ID
19930029336
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Abumeri, G. H. (NASA Lewis Research Center Cleveland, OH, United States)
Reddy, E. S. (Sverdrup Technology, Inc., Brook Park; NASA, Lewis Research Center Cleveland, OH, United States)
Murthy, P. L. N. (NASA Lewis Research Center Cleveland, OH, United States)
Chamis, C. C. (NASA Lewis Research Center Cleveland, OH, United States)