Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Vibration Attenuation Analysis in a Structural System Applying Pendulum Dynamic Absorber (DVA) with SMA Superelastic Wire and Rod
Submission Author:
Yuri José Oliveira Moraes , MG
Co-Authors:
Yuri José Oliveira Moraes, Antonio Almeida Silva
Presenter: Yuri José Oliveira Moraes
doi://10.26678/ABCM.COBEM2023.COB2023-0657
Abstract
Mechanical vibrations are important phenomena in the physical world. Generally, such oscillations can become undesirable, causing temporary damage or collapse of mechanical and structural systems. To contain these effects, techniques have been researched that come to control or minimize the implications this phenomenon. Among the available vibrational control methods, passive control stands out for different types of excitations, such as permanents in the machines operation, or transient ones, such as those resulting from natural weather, earthquakes and wind loads. Its main feature is low cost, no need for an electrical power source and little maintenance. Thus, the objective of this work was to dynamically characterize a Dynamic Vibration Absorber (DVA) of an alloy SMA superelastic (SE-NiTi). The studied device consists of a pendulum attached to a one-story structure (1DOF), with the pendulum (wire and rod) being made steel or SMA. Initially, the structural design was developed in a computational model to estimate geometric dimensions of the primary system. The length pendulum rod was dimensioned so that the natural frequency of the absorber was tuned to the primary system. In the experimental analysis for structure without/with incorporation of passive controller, it was concluding the need for changes in important structural parameters, such as increasing the amplitude excitation and stiffness of pendulum in order to optimize the performance of DVA, allowing a greater pseudoelastic deformation material and generation of mechanical hysteresis. As a result, greater energy dissipation and increased damping can lead to a reduction in the system response amplitudes in subsequent works.
Keywords
dynamic vibration absorber, Shape Memory Alloys, structural dynamics, Passive Vibration Control
