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Numerical, analytical and experimental studies on passive control of vibrations and energy harvesting


Since the structures are becoming lighter and slender, their dynamic behavior have been considered of great relevance in modern engineering applications. In a classical engineering approach, structural responses are undesired and methods for suppressing them are pursued. The dynamic loads can be either monochromatic or polychromatic. In the case of polychromatic excitations, it is well known that passive suppressors (e.g., those in which no input of energy is needed) whose function is based on linear dynamics have their efficiency greatly decreased. Aiming at circumventing this limitation, non-linear vibration absorbers appear as promising solutions. Even though potentially dangerous due to structural fatigue, oscillatory responses have been pursued in modern engineering applications associated with energy harvesting. In this research field, structural kinetic energy can be converted into another form such as electric energy. The electromechanical conversion can be by means of either piezoelectric of electromagnetic effects. This research proposal aims at investigating two problems related to the dynamics of structures by using three different and complementary approaches, namely, numerical, analytical and experimental. The first problem to be investigated is the development of a system for passive control of oscillations composed of a number of different non-linear vibration absorbers. In this case, a shear-building is the main structure that will be subjected to different support excitations. The second problem deals with the development of a family of solutions for simultaneous passive control of oscillations and energy harvesting from structural oscillations caused by different loads that will be defined during the project. The methodology based on the three complementary approaches for obtaining the solutions are innovative. Another novel aspect herein is the development of different solutions for the problems to be investigated, all tested in the laboratory scale. Patents may be achieved during the project. Concerning human resources, the project will directly fund two PhD scholarships and two undergraduate students. Videos that illustrate some of the dynamic phenomena that will be studied during the project will be produced for supporting didactic activities. The proposal of a new graduate course on experimental structural dynamics will be also made. The different data obtained during the project (for example, data from numerical simulations or from the laboratory tests) will be open to the scientific community according to a data management plan. (AU)

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(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FRANZINI, GUILHERME ROSA; MACIEL, VITOR SCHWENCK FRANCO; VERNIZZI, GUILHERME JORGE; ZULLI, DANIELE. Simultaneous passive suppression and energy harvesting from galloping using a bistable piezoelectric nonlinear energy sink. NONLINEAR DYNAMICS, v. N/A, p. 22-pg., . (21/04434-1, 22/12546-7, 22/00770-0, 22/02995-9)

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