Improvement of the compression ratio of vibratory signals by double pass DWHT

Aim eacute  Joseph Oyobe Okassa; Jean Pierre Ngantcha; Auguste Ndtoungou; Pierre Ele    nbsp

doi:10.17485/IJST/v13i30.924

Article

Improvement of the compression ratio of vibratory signals by double pass DWHT

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Indian Journal of Science and Technology

DOI: 10.17485/IJST/v13i30.924

Year: 2020, Volume: 13, Issue: 30, Pages: 3051-3058

Original Article

Improvement of the compression ratio of vibratory signals by double pass DWHT

Aimé Joseph Oyobe Okassa¹*, Jean Pierre Ngantcha¹, Auguste Ndtoungou¹,Pierre Ele²

¹EPM of Masuku, Franceville, Gabon. Tel.: +241-77 32 81 29
²ENSP of UYdé & IUT of UDla Yaoundé & Douala, Cameroon

*Corresponding Author

Tel: +241-77 32 81 29
Email: [email protected]

Received Date:14 June 2020, Accepted Date:10 July 2020, Published Date:19 August 2020

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Background/Objectives: The vibratory signals delivered by rotating machines are very important in the maintenance of these machines. For maintenance purposes they are stored or transmitted. The storage and transmission of these signals pose problems of space and bandwidth. To solve this problem compression is a solution. Methods/Statistical analysis: In this work, we compress and decompress the vibration signals formed by variations of the amplitudes vibration of a ball bearing. We used an algorithm based on the Walsh-Hadamard Transform (WHT) in two passes. The coefficients obtained are coded according to Huffman’s coding. An evaluation of performances of this algorithm is made on the basis of the measurements of SNR, MFD,MSE, PRD and CR. Findings: Compression ratios are high when we consider that the reconstruction is almost perfect. Usually, compression methods by transformation have a nonzero reconstructed error. However, this bleaching of vibratory signals both in the temporal and frequency domain, followed by good quantization precision, allowed to cancel this error. In view of these qualitative and quantitative evaluation parameters of the method result, it can be said that the method gives very good results. Novelty/Applications: Improved of Compression Ratio of vibratory signals for maintenance purposes.

Keywords: WHT; compression; vibratory signals; storage; bandwidth; rotating machines

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Copyright

© 2020 Oyobe Okassa et al.This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Published By Indian Society for Education and Environment (iSee).