tailieunhanh - Báo cáo sinh học: " Research Article Flexible Riser Monitoring Using Hybrid Magnetic/Optical Strain Gage Techniques through RLS Adaptive Filtering"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Research Article Flexible Riser Monitoring Using Hybrid Magnetic/Optical Strain Gage Techniques through RLS Adaptive Filtering | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 176203 14 pages doi 2010 176203 Research Article Flexible Riser Monitoring Using Hybrid Magnetic Optical Strain Gage Techniques through RLS Adaptive Filtering Daniel Pipa Sergio Morikawa Gustavo Pires Claudio Camerini and Joao Marcio Santos Materials Equipments and Corrosion Department TMEC Petrobras Research and Development Center CENPES Av. Horacio Macedo 950. Cidade Universitaria 21941-915 Rio de Janeiro RJ Brazil Correspondence should be addressed to Daniel Pipa danielpipa@ Received 30 November 2009 Revised 5 April 2010 Accepted 7 May 2010 Academic Editor Joao Manuel R. S. Tavares Copyright 2010 Daniel Pipa et al. 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. Flexible riser is a class of flexible pipes which is used to connect subsea pipelines to floating offshore installations such as FPSOs floating production storage off-loading unit and SS semisubmersible platforms in oil and gas production. Flexible risers are multilayered pipes typically comprising an inner flexible metal carcass surrounded by polymer layers and spiral wound steel ligaments also referred to as armor wires. Since these armor wires are made of steel their magnetic properties are sensitive to the stress they are subjected to. By measuring their magnetic properties in a nonintrusive manner it is possible to compare the stress in the armor wires thus allowing the identification of damaged ones. However one encounters several sources of noise when measuring electromagnetic properties contactlessly such as movement between specimen and probe and magnetic noise. This paper describes the development of a new technique for automatic monitoring of armor layers of flexible risers. The proposed approach aims to minimize .