Reduction of gear pair transmission error with tooth profile modification

Student: Mr. Rahulan Raul Tharmakulasingam

First supervisor: Dr. Giulio Alfano

Second Supervisor: Dr. Mark Atherton

Funded by: School of Engineering and Design

Project details: The gear noise problem that widely occurs in power transmission systems is typically characterised by one or more high amplitude acoustic signals. The noise originates from the vibration of the gear pair system caused by transmission error excitation that arises from tooth profile errors, misalignment and tooth deflections. In very severe cases, the gear vibrations can also reduce life and performance of the power transmission systems. The fundamental gear noise problem has been of interest to many researchers for a very long time. Research work carried out has been focused on shaping the gear tooth profiles to reduce stress and loading, adding vibration isolation to the gearbox to reduce vibration, and other such passive control methods. This project aims to further research the effect of tooth profile modifications on the transmission error of gear pairs, with the added impetus of reducing the noise and vibration caused by the meshing of gear pairs during operation.

In this project:

  1. A finite element model of a spur gear pair is presented for geometrically nonlinear analysis of the gear interactions and the resulting transmission error.
  2. The development of an automated process to change and remodel the spur gear pair to incorporate changes in geometry and function is also integrated into the process by the use of Python, which is a dynamic object-oriented programming language. A detailed parametric study, involving development of an optimisation algorithm to design the tooth modifications, will be performed to quantify the changes in the transmission error as a function of tooth profile modification parameters as compared to an unmodified gear pair baseline.

Page last updated: Monday 09 July 2012