A unified approach to substructuring and structural modification problems

Issue title: Dedicated to Professor Bruno Piombo

Article type: Research Article

Authors: D'Ambrogio, Walter | Sestieri, Aldo

Affiliations: Universitè de L'Aquila, Dipartimento di Energetica, Località Monteluco, I-67040 Roio Poggio (AQ), Italy | Universit?di Roma "La Sapienza", Dipartimento di Meccanica e Aeronautica, Via Eudossiana 18, I-00184 Roma, Italy

Note: [] Corresponding author. E-mail: dambro@ing.univaq.it

Abstract: Substructures coupling is still an important tool in several applications of modal analysis, especially structural modification and structures assembling. The subject is particularly relevant in virtual prototyping of complex systems and responds to actual industrial needs. This paper analyzes the possibility of assembling together different substructures' models. The important role of rotational DoFs is highlighted, underlying the difficulty of assembling theoretical and experimental models, for which, usually, the rotational DoFs are not available. Expansion techniques can be used to provide this information as well as appropriate modelling of joints. With this information FRF models, modal models and FE models can be appropriately combined together and solutions for several cases of practical interest are presented. The analyzed procedures are tested on purpose-built benchmarks, showing limits and capabilities of each of them.

Journal: Shock and Vibration, vol. 11, no. 3-4, pp. 295-309, 2004