Eventos Anais de eventos
DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
THE USE OF A PNEUMATIC INERTER FOR VIBRATION ISOLATION
Submission Author:
Fernando de Haro Moraes , SP
Co-Authors:
Fernando de Haro Moraes, Paulo José Paupitz Gonçalves
Presenter: Fernando de Haro Moraes
doi://10.26678/ABCM.DINAME2017.DIN17-0118
Abstract
This article presents the analysis of a pneumatic vibration isolator due to harmonic base excitation and shock base excitation. Vibration isolators have a broad range of applications and they are found on most machines and vehicles. This vibration isolator Inerter or inertial isolator consists of a two terminal fixing mechanism that reacts to acceleration. Inerter devices can be mechanical with levers, bars, beams, masses, rack with flywheel or pneumatic with tubes, chambers, and bellows filled with fluid. The main advantage of an Inerter is that it presents a region where transmissibility is very small, almost zero, after passing the resonance frequency. On the other hand, the disadvantage is that, the mechanism stabilizes in a continuous value of transmissibility at high frequencies. It is analyzed a device proposed by Goodwin, consisting of a flexible bellow without stiffness, which supports the body suspended to be isolated. The flexible bellow communicates with a rigid chamber through a rigid metal duct that is closed and fully filled with a gaseous fluid (air). Thus, the article presents the viscous damper behavior (mass-spring-damper) relative to the vibration isolator Inerter (mass-spring-damper-Inerter) for the harmonic response, numerical simulations of shock response, frequency spectrum, transmissibility and time histories. The method of Shock Response Spectra (SRS-maximax) considers the higher displacements of the system. It will be analyzed the influence of the pneumatic system parameters (metal ducts and flexible bellow dimensions) in the stiffness, damping, and inertance relative to frequency. The Inerter has shown efficiency in performing the vibration isolation in the regions after the resonance frequency. The analysis of the pneumatic parameters has shown the influence of each one on the system behavior.
Keywords
Pneumatic Inerter, Vibration Isolator, Shock Response
