Estudo teórico e aplicações dos absorvedores dinâmicos de vibrações

• Autor(a) principal: Mollica, Guilherme Henrique Gonçalves [UNESP]
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156961; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-08-28/000906234.pdf
• topic: Vibração; Absorvedores; Dinâmica estrutural; Vibration

Undesired vibrations can lead to problems as structural damage and even affect human health. There are a great number of ways of controlling these vibrations. Dynamic vibration absorbers are devices that have a series of advantages when compared with other methods of control. They are fixed at the main structure, in which it is desired to neutralize excessive vibrations. DVAs devices can be classified into passive, adaptive and active ones. Passive DVAs are the simplest, cheapest and most practical type. Its utilization will take place when the frequency of excitation is not variable, since its frequency band of operation is relatively narrow. To avoid this problem new types of DVAs were introduced, known as adaptive DVA and active DVA. Physical parameters of adaptive DVAs, like stiffness, damping and mass can be varied so that the DVA can be tuned to a desired frequency. Active DVAs consist of an actuator parallel to a resilient element. This actuator is controlled by a control law. The applicability of each type of DVA varies according to external characteristics, like the frequency of excitation, the capacity of the system to provide energy to the DVA, the cost of implementation and the efficiency required. Passive DVAs are very practical and have a low-cost implementation, however, the range of frequency for which they are effective is very small. On the other hand, active DVAs require a large amount of energy to operate, although its operational range of frequency is very broad. Therefore, depending on the system where the control of the undesired vibrations is needed, a specific type of DVA will be recommended