Remarks on optimization of impact damping for a non-ideal and nonlinear structural system

Autor(es)

Silva, Marcelo A. ^[1] ; Wahrhaftig, Alexandre M. ^[2] ; Brasil, Reyolando M. L. R. F. ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ ABC UFABC, Ctr Engn Modeling & Appl Social Sci, Santo Andre, SP - Brazil

^[2] Fed Univ Bahia UFBA, Polytech Sch, Dept Construct & Struct, Rua Aristides Novis 02, 5 Andar, BR-40210910 Salvador, BA - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL; v. 40, n. 2, p. 948-965, JUN 2021.
• Citações Web of Science: 0

Resumo

It is intended, in this work, to present some research results on the optimization of an impact damper for a structural system excited by a non-ideal power source. In the model, the impact vibration absorber is, basically, a small free mass inside a box carved in the structure that undergoes undamped linear motions colliding against the walls of the box. Whenever the mass shocks against the walls of the box, an exchange of kinetic energy between the mass and the structure may be used to control the amplitude of the dynamic response of the structure. In this work, the structure is excited by a non-ideal power source, a DC electric motor installed on it, which may present the Sommerfeld effect. A non-ideal power source is one that interacts with the motion of the structure as opposed to an ideal source whose amplitude and frequency are fixed, independent of the displacements of the structure. Here, the dynamic response of the system is computed using step-by-step numerical integration of the equations of motion derived via a Lagrangian formulation. The optimization problem is defined considering as the objective function the maximum amplitude of the structure displacement, while the design variables are the weight of the free mass and the width of the carved box. Using the augmented Lagrangian method, several optimization problems are formulated, and, solving them, the best design to maximize the efficiency of the impact damper is obtained. (AU)

• Processo FAPESP: 05/02815-5 - Otimização de torres eólicas em concreto armado baseada em resultados experimentais
• Beneficiário: Marcelo Araujo da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 06/04744-0 - Otimização de torres em concreto armado para suporte de geradores eólicos
• Beneficiário: Marcelo Araujo da Silva
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 18/11820-2 - Determinação da Confiabilidade Estrutural em Vigas Metálicas Protendidas Sob Carregamento Dinâmico e a Análise da Interação Dinâmica entre o Cabo de Protensão e a Viga Protendida
• Beneficiário: Marcelo Araujo da Silva
• Modalidade de apoio: Bolsas no Exterior - Pesquisa