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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Silva, Marcelo A. [1] ; Wahrhaftig, Alexandre M. [2] ; Brasil, Reyolando M. L. R. F. [1]
Total Authors: 3
Affiliation:
[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
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL; v. 40, n. 2, p. 948-965, JUN 2021.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 05/02815-5 - Optimization of RC eolic towers based on experimental data
Grantee:Marcelo Araujo da Silva
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 06/04744-0 - Optimization of reinforced concrete towers to support eolic generators
Grantee:Marcelo Araujo da Silva
Support type: Scholarships abroad - Research
FAPESP's process: 18/11820-2 - The study of the reliability of pre-stressed steel beams, and the dynamic interaction between the tendon and the pre-stressed beam
Grantee:Marcelo Araujo da Silva
Support type: Scholarships abroad - Research