Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
PROJECT OF A VIBRATION PASSIVE CONTROL SYSTEM FOR THE MAIN NOISE SOURCE OF A SMALL TRACTOR WITHOUT CAB
Submission Author:
Roberta Tempski Leite Elias , PR
Co-Authors:
Roberta Tempski Leite Elias, Carlos Alberto Bavastri
Presenter: Roberta Tempski Leite Elias
doi://10.26678/ABCM.COBEM2019.COB2019-0177
Abstract
The increasing concern about worker well-being with increased productivity has led to studies in the area of ergonomics and causes of occupational diseases. The present work studies one of the critical factors in the insalubrity of operation of agricultural tractors, the noise. A previous study of a small agricultural tractor performed to characterize the behavior of noise at the tractor operator's ears showed that the roof causes a considerable increase in the sound pressure level. This has been proven through road test measurements and numerical simulations. Thus, this work proposes to design a vibrations passive control system, through constrained layers with metallic and viscoelastic materials, in order to reduce the noise coming exclusively from this source. Simulations by finite element method and measurements in the field and laboratory, with and without the presence of these control devices were done. The proposed solution with constrained layers has shown to be an effective solution to control the vibration of a large plate with a high number of natural frequencies in the frequency range of interest (1000 Hz to 1200 Hz). This solution reduced the vibration significantly, up to 18 dB.
Keywords
Passive control, Vibrations, noise, tractor
