The dynamic behaviour of a gearbox is usually simulated with lumped parameter models. However, with this approach, it is difficult to take into account the flexibility ofthe components of the transmission system with sufficient accuracy. Moreover, in the case of light structures as in aircraft applications, the casing flexibility is not negligible and affects the whole transmission system. In this work, to overcome these limitations, the CMS (Component Modal Synthesis) technique was applied. A model of a sample transmission system with two shafts, two simplified gears and a flexible casing was modeled in a FEM environment. Afterwards, the condensed dynamical characteristics of the structure were exported into a MATLAB procedure to perform a transient analysis taking into account the non linear phenomena associated with the gear meshing (in particular the effect of the periodicity of the meshing stiffness). Virtual accelerometers measured the acceleration of some nodes and the virtual signals were processed applying standard diagnostic techniques. With this approach simulations of a virtual test bench for diagnostic applications were carried out, monitoring virtual accelerometer signals in case of a damaged tooth (i.e. incipient bending crack) and observing the effects due to the casing flexibility. Moreover, a sensitivity analysis on the virtual accelerometer location was performed.

Component modal synthesis modeling of a gearbox for vibration monitoring simulation

CARMIGNANI, COSTANTINO;FORTE, PAOLA;
2009-01-01

Abstract

The dynamic behaviour of a gearbox is usually simulated with lumped parameter models. However, with this approach, it is difficult to take into account the flexibility ofthe components of the transmission system with sufficient accuracy. Moreover, in the case of light structures as in aircraft applications, the casing flexibility is not negligible and affects the whole transmission system. In this work, to overcome these limitations, the CMS (Component Modal Synthesis) technique was applied. A model of a sample transmission system with two shafts, two simplified gears and a flexible casing was modeled in a FEM environment. Afterwards, the condensed dynamical characteristics of the structure were exported into a MATLAB procedure to perform a transient analysis taking into account the non linear phenomena associated with the gear meshing (in particular the effect of the periodicity of the meshing stiffness). Virtual accelerometers measured the acceleration of some nodes and the virtual signals were processed applying standard diagnostic techniques. With this approach simulations of a virtual test bench for diagnostic applications were carried out, monitoring virtual accelerometer signals in case of a damaged tooth (i.e. incipient bending crack) and observing the effects due to the casing flexibility. Moreover, a sensitivity analysis on the virtual accelerometer location was performed.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/134642
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? ND
social impact