Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
DESIGN AND MANUFACTURE OF A TEST BENCH FOR INDUCING RESONANT REGIMES IN BEAMS OF ROTARY MACHINERY SUPPORT
Submission Author:
Alexandre de Macêdo Wahrhaftig , BA , Brazil
Co-Authors:
Alexandre de Macêdo Wahrhaftig, Reyolando Brasil, Gabriela Silva Correia Cordeiro
Presenter: Alexandre de Macêdo Wahrhaftig
doi://10.26678/ABCM.COBEM2021.COB2021-0026
Abstract
In this paper, a test bench projected to induce resonant regimes in a support beam is described and detailed in draws. The necessity of studying resonance effects comes up due to the fact that uncontrolled vibrations of base structures of equipment produce harmful aspects for assembly lines, beyond representing a danger to the workers. One way to study these effects is by altering the stiffness of the support by means of the geometric portion of the structural stiffness, which represents an introduction of a nonlinear geometric parameter on vibrations of rotating machinery support structures. That occurs because the dynamic characteristics of structural systems depend on their stiffness and mass. With these, the natural frequencies and modes of free vibrations can be determined. Nevertheless, the initial stiffness, computed in its unloaded state, can be affected by the applied forces, the so-called geometric stiffness. Compressive forces usually reduce the stiffness and, consequently, the frequencies of vibration, whereas tension forces elevate these same frequencies. In order to experimentally assess the previously mentioned hypothesis and induce resonant regimes, a test bench was projected and fabricated trying to approximate, at the maximum, the mathematic to the physic of the problem. In this sense, lies the biggest challenge for the project, which is to depart from the initial conception based on a determined use and goes until the materialization of the ideas. In this sense, to make possible the investigation, all parameters had to be defined in a preliminary stage of calculation for determining the weight of the engine, operation frequencies, dimensions of the cross-section, and the way by which the materialization of the boundary condition of the problem would be reached.
Keywords
project, As built, Engine Base, Beam Resonance, Geometric non-linearity
