APPLICATIONS OF THE MODALLY ENHANCED DYNAMIC ABSORBER (MEDA)

摘要

Tuned absorbers are attached substructures that are often used to reduce undesired responses in many dynamic applications. Typically, these tuned absorbers are only applied to affect one resonant frequency at a time. They are usually designed as a quick fix after production of the structure has begun and the problem of undesired response has occurred. A new concept, referred to as the Modally Enhanced Dynamic Absorber (MEDA), develops a substructure to de-tune a set of resonant frequencies and mode shapes over a target bandwidth. The de-tuning substructure is designed to have the same frequencies and mode shapes as the primary structure; this can usually be achieved with standard optimization techniques. The MEDA substructure has a tuned absorber effect on the modes used in the optimization of the MEDA. This concept therefore presents an improvement in multiple mode de-tuning with a single structure over a single mode tuned absorber approach. Several simple structural cases are presented to show the advantages of the Modally Enhanced Dynamic Absorber.