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http://dx.doi.org/10.3744/SNAK.2012.49.4.350

Study on Applicability of Frequency Domain-Based Fatigue Analysis for Wide Band Gaussian Process I : Rayleigh PDF  

Choung, Joon-Mo (Dep't of Naval Architecture and Ocean Engineering, Inha University)
Kim, Kyung-Su (Dep't of Naval Architecture and Ocean Engineering, Inha University)
Nam, Ji-Myung (Dep't of Naval Architecture and Ocean Engineering, Inha University)
Koo, Jeong-Bon (Marine Research Institute, Samsung Heavy Industries Co., Ltd.)
Kim, Min-Soo (Lloyd's Register Asia)
Shim, Yong-Lae (American Bureau of Shipping)
Urm, Hang-Sub (Det Norske Veritas)
Publication Information
Journal of the Society of Naval Architects of Korea / v.49, no.4, 2012 , pp. 350-358 More about this Journal
Abstract
This paper deals with accuracy of accumulated fatigue damage estimation using stochastic fatigue analysis method based on Rayleigh PDF. From full scale measurement data on an 8100TEU container vessel, zero-order spectral moments for wave- and vibration-induced energy spectral densities are determined on the probability level of 99%. 80 simulation cases in total are prepared according to the variation of ratio of zero-order spectral moments and center frequency of vibration ESD. By using inverse Fourier transformation and rainflow cycle counting for the combined ESD of wave and vibration, exact fatigue damages are derived. Fatigue damages in frequency domain based on Rayleigh PDF show large conservativeness compared to exact fatigue damages in times domain. The main cause of the excessive conservativeness is analyzed by two aspects: ratio of zero crossing and peak frequencies and ratio of initial zero order spectral moments and zero order spectral moments from rainflow stress range distributions. Finally, a guideline of applicability of Rayleigh PDF is proposed for wide band processes.
Keywords
Rayleigh probability density function(PDF); Energy spectral density(ESD); Rainflow cycle counting(RFC); Invserse fourier transformation; Wave process; Vibration process; Combined process; Wide band process; Narrow band process;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Park, J.B. Kang, C.H. Kim, K.S. Choung, J. & Yoo, C.H., 2011. A Study on Frequency Domain Fatigue Damage Prediction Models for Wide-Banded Bimodal Stress Range Spectra. Journal of the Society of Naval Architects of Korea, 48(4), pp.299-307.   DOI   ScienceOn
2 Storhaug, G. et al., 2010a. Consequence of Whipping and Springing on Fatigue and Extreme Loading for a 13000TEU Container Vessel Based on Model Tests. 11th International Symposium on Practical Design of Ships and Other Floating Structures, Rio de Janeiro, Brazil, pp.19-24.
3 Storhaug, G. Choi, B.K. Moan, T. & Hermundstad. O.A., 2010b. Consequence of Whipping and Springing on Fatigue for a 8600TEU Container Vessel in Different Trades Based on Model Tests. 11th International Symposium on Practical Design of Ships and Other Floating Structures, Rio de Janeiro, Brazil, pp.19-24.
4 Vanmarcke, E.H., 1972. Properties of spectral moments with applications to random vibration. Journal of the Engineering Mechanics Division, 98(2), pp.425-446.
5 API, 2008. API Recommended practice 2SK Design and Analysis of Stationkeeping Systems for Floating Structures, American Petroleum Institute.
6 ASTM, 1997. ASTM E 1049-85 Standard Practices for Cycle Counting in Fatigue Analysis, American Society for Testing and Materials.
7 Choung, J. & Yoon, K.Y., 2008. Fully Stochastic Fatigue Analysis for FPSO Based on Shipyard Practices. International Journal of Offshore and Polar Engineering, 18(2), pp.142-148.
8 Bakkers, N. Tong, J. & Park, J.B., 2011. Full Scale Measurements and Fatigue Damage Assessment on a Large Container Ship. Proceedings of the Annual Autumn Meeting, Mokpo, Korea, November 2011, pp.204-208.
9 Benasciutti, D. & Tovo, R., 2007. On Fatigue Damage Assessment in Bimodal Random Processes. International Journal of Fatigue, 29(2), pp.232-244.   DOI   ScienceOn
10 Choung, J. Joung, J.H. Choo, M.H. & Yoon, K.Y., 2007. Development of Fully Stochastic Fatigue Analysis Program for Offshore Floaters. Journal of the Society of Naval Architects of Korea, 44(4), pp.299-307.
11 DNV, 2010a. Classification Notes No. 30.7 Fatigue Assessment of Ship Structures, Det Norske Veritas.
12 DNV, 2010b. Recommended practice DNV-RP-C206 Fatigue Methodology of Offshore Ships, Det Norske Veritas.
13 Heggelund, S.E. Storhaug, G. & Choi, B.K., 2011. OMAE2011-49378: Full scale measurements of fatigue and extreme loading including whipping on an 8600TEU post panamax container vessel in the Asia to Europe trade. Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering, Rotterdam, The Netherlands, pp.19-24.
14 Koo, J.B. et al., 2011. Fatigue Damage Assessment Based on Full Scale Measurement Data for a Large Container Carrier. Proceedings of the 21th International Offshore and Polar Engineering Conference, Maui, Hawaii, USA, pp.19-24.