On the optimization of a hybrid tuned mass damper for impulse loading. (2nd July 2015)

• Record Type: Journal Article
• Authors: Salvi, J; Rizzi, E; Rustighi, E; Ferguson, N S
• Is Part Of: Smart materials and structures. Volume 24:Number 8(2015:Aug.)
• Publication Date: 2015-07-02
• Subjects: hybrid tuned mass damper (TMD) -- optimum tuning -- shock loading -- unit impulse excitation -- feedback closed-loop control; Smart materials -- Periodicals; Strucural design -- Periodicals; 620.11
• DOI: 10.1088/0964-1726/24/8/085010
• Languages: English
• ISSNs: 0964-1726

Abstract

Abstract: The present paper deals with the optimization of a hybrid tuned mass damper (TMD) in reducing the transient structural response due to impulse loading. In particular, a unit impulse excitation has been assumed, acting as base displacement, which is a situation that may occur in different real applications. The proposed hybrid TMD is composed of a previously optimized passive TMD and an added optimized active controller. Such configuration has been conceived in view of reducing both the global and the peak response. Especially on the latter task, the introduction of the active controller brings in a significant contribution. Prior, a bounded-input-bounded-output stability analysis on the control gains is developed. Different control laws have been investigated, assuming as primary structures, first a single-degree-of-freedom benchmark system and then a multi-degree-of-freedom building, in order to point out the most appropriate control law for the given structural context. In particular, a new control law, based on a linear combination of acceleration and velocity, allowed for remarkable peak response reduction. The achieved dynamic response exhibits a time settling weakly oscillating response, an indication of a stable behavior, and therefore represents a suitable option for the active controller, in view of various engineering applications.