E' stata sufficiente l'autorizzazione del Direttore di Dipartimento poichè non era prevista attività didattica nel mese di agosto 2002.

The proposed research has focused theoretically and experimentally on devising nonlinear strategies to control resonant vibrations in distributed-parameter systems. The specific objective was to design intelligent strategies to control systems when linear theories cannot be applied and recourse to appropriate nonlinear techniques is unavoidable. Emphasis was placed on closed-loop control techniques because these techniques are more robust and are model-independent. The main research objectives can be summarized as follows. (i) Modeling and Analysis Use of reliable and accurate models of shallow arches and shells were made to develop, via nonlinear normal mode approach, first, intuition as to the proper feedback control laws for each system and, then, to construct the steady-state dynamics of the controlled and uncontrolled system. Subsequently, the range of effectiveness for each control law was determined. (ii) Experimental Implementation and Investigation The effectiveness of the nonlinear control strategies numerically and analitically validated were also investigated experimentally. The research objectives have been implemented via a combination of analytical, numerical, and experimental techniques. Namely, (i) application of higher-order direct perturbation techniques (i.e., the method of multiple scales) directly to the governing integral-partial-differential equations of motion and associated boundary conditions (also known as nonlinear normal mode approach); (ii) use of the normal form of the system dynamics for the relevant external/internal resonance conditions as a basis for the design of the control laws; (iii) systematic bifurcation analysis, via path-following techniques, of the modulation equations governing the dominant dynamics of the system (with controls and without controls) and subsequent determination of stable operating regimes for the controlled systems; (iv) use of discretized multiple-degree-of-freedom versions of the systems as set of ordinary-differential equations obtained via Galerkin or rectified Galerkin methods to further corroborate the outcomes of the approximate direct analytical results; (v) design and implementation of an experimental apparatus to validate experimentally the designed nonlinear control strategies.

A theoretical and experimental investigation of nonlinear resonance-cancellation strategies / Lacarbonara, Walter; H., Yabuno. - (2002).

A theoretical and experimental investigation of nonlinear resonance-cancellation strategies

LACARBONARA, Walter;
2002

Abstract

E' stata sufficiente l'autorizzazione del Direttore di Dipartimento poichè non era prevista attività didattica nel mese di agosto 2002.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/422521
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