tailieunhanh - Báo cáo sinh học: " Research Article Adaptive Wavelet Transform Method to Identify Cracks in Gears"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Research Article Adaptive Wavelet Transform Method to Identify Cracks in Gears | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 879875 8 pages doi 2010 879875 Research Article Adaptive Wavelet Transform Method to Identify Cracks in Gears Ales Belsak and Joze Flasker Laboratory for Computer Aided Engineering Faculty of Mechanical Engineering University ofMaribor Smetanova ulica 17 2000 Maribor Slovenia Correspondence should be addressed to Ales Belsak Received 20 January 2010 Revised 18 May 2010 Accepted 21 June 2010 Academic Editor Ling Shao Copyright 2010 A. Belsak and J. Flasker. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Many damages and faults can cause problems in gear unit operation. A crack in the tooth root is probably the least desirable among them. It often leads to failure of gear unit operation. By monitoring vibrations it is possible to determine the presence of a crack. Signals are however very noisy. This makes it difficult to define properties of individual components. Wavelet analysis is an effective tool for analysing signals and for defining properties. In this paper a denoising method based on wavelet analysis which takes prior information about impulse probability density into consideration is used to identify transient information from vibration signals of a gear unit with a fatigue crack in the tooth root. 1. Introduction The aim of maintenance is to keep a technical system gear unit in the most suitable working condition and its purpose is to discover to diagnose to foresee to prevent and to eliminate damages. The purpose of modern maintenance however is not only to eliminate failures but also to define the stage of a potential danger of a sudden failure of system operation. The aim of diagnostics is to define the current condition of the system and the location shape and