Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
INFLUENCE OF MESH STIFFNESS MODELING ON THE DYNAMIC RESPONSE OF GEARED ROTORS
Submission Author:
Laís Bittencourt Visnadi , DF
Co-Authors:
Laís Bittencourt Visnadi, Helio Fiori de Castro
Presenter: Laís Bittencourt Visnadi
doi://10.26678/ABCM.COBEM2021.COB2021-0791
Abstract
Gear pair dynamics is widely studied and recent researches present complex models to this purpose. When considering rotor dynamics, the mesh stiffness is usually approximated, although this is an important source of vibration on the rotating system. This paper intends to evaluate the influence of different methods for estimating mesh stiffness on the rotor response. The considered methods were API, step function, sinusoidal function and variable cross section beam. Of these, the beam method is the most detailed and was considered the reference. The mean value of step and sinusoidal functions was the value provided by API method, although it was lower than the mean value of mesh stiffness calculated by beam method. Sinusoidal function tends to underestimate response and step function tends to overestimate it, especially for a helical gear pair and at response high frequencies. For constant rotational speed problems, computational cost does not justify using approximations and beam method is recommended. For variable rotational speed problems, considering a sinusoidal function with API mean value is an option for spur gear pairs and with beam method mean value is better for helical gear pairs.
Keywords
mesh stiffness, spur gear, helical gear, gear pair dynamics
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