STRUCTURAL MODIFICATION BASED ON MEASURED FREQUENCY RESPONSE FUNCTIONS: AN EXACT EIGENPROPERTIES REALLOCATION

✍ Scribed by Y.-H. PARK; Y.-s. PARK

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 277 KB
• Volume: 237
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2000.3041

✦ Synopsis

A structural modi"cation method based on frequency response functions is presented in terms of an inverse eigenvalue problem. The design objective is to derive multiple lumped mass, damper and sti!ness modi"cations needed to reallocate eigenvalues and specify eigenvectors of an existing structure. A frequency response function-based substructure-coupling concept is used to get the system dynamic equations. A linear algebraic equation is "nally obtained to identify the necessary structural modi"cations. The exact structural modi"cations are determined. The existence and uniqueness of exact solutions are also investigated. The feasibility of structural modi"cation is examined under the restrictions of structural modi"cations in the case where in"nite many exact modi"cations can exist. The proposed method was applied to an example structure. Based on experiment data, the minimum sti!ness modi"cations were calculated. The result of application indicates that the suggested method can derive accurate structural changes just based on minimum number of measured frequency response functions.

2000 Academic Press