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Data Acquisition of Time Series from Stationary Ergodic Random Process Spectrums
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 Title & Authors
Data Acquisition of Time Series from Stationary Ergodic Random Process Spectrums
Park, Jun-Bum; Kim, Kyung-Su; Choung, Joon-Mo; Kim, Jae-Woo; Yoo, Chang-Hyuk; Ha, Yeong-Su;
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The fatigue damages in structural details of offshore plants can be accumulated due to various environmental loadings such as swell, wave, wind and current. It is known that load histories acting on mooring and riser systems show stationary and ergodic bimodal wide-banded process. This paper provides refined approach to obtain time signals representing stress range histories from wide-banded bimodal spectrum which consists of ideally narrow-banded and fully separated two spectrums. Variations of the probabilistic characteristics for time signals according to frequency and sampling time increments are compared with the reference data to be the probabilistic characteristics such as zero-crossing period, peak period, and irregularity factor obtained from an assumed ideal spectrum. It is proved that the sampling time increment more affects on the probabilistic characteristics than frequency increment. The fatigue damages according to the frequency and sampling time increments are also compared with the ones with minimum increment condition which are thought to be exact fatigue damage. It is concluded that the maximum sampling time increment to obtain reliable time signals should be determined that ratio of applied maximum sampling time increment and minimum period is less than approximately 0.08.
Stationary ergodic random Process;Spectrum;Zero-crossing period;Peak period;Irregularity factor;Sampling time increment;Frequency increment;
 Cited by
사봉형 스펙트럼을 이용한 라이저 피로해석 연구,김상우;이승재;최솔미;

대한조선학회논문집, 2016. vol.53. 6, pp.514-520 crossref(new window)
부유식 해양플랜트 다점 계류라인의 피로손상모델 비교,박준범;김국현;김경수;고대은;

한국해양공학회지, 2013. vol.27. 5, pp.63-69 crossref(new window)
Comparison of Fatigue Damage Models of Spread Mooring Line for Floating Type Offshore Plant, Journal of Ocean Engineering and Technology, 2013, 27, 5, 63  crossref(new windwow)
Fatigue Damage Model Comparison with Tri-modal Spectrum under Stationary Gaussian Random Processes, Journal of Ocean Engineering and Technology, 2014, 28, 3, 185  crossref(new windwow)
A Study on the Riser Fatigue Analysis Using a Quarter-modal Spectrum, Journal of the Society of Naval Architects of Korea, 2016, 53, 6, 514  crossref(new windwow)
API - American Petroleum Institute (2005). Design and Analysis of Stationkeeping Systems for Floating Structures, RP-2SK, 3rd Edition.

Benasciutti, D. and Tovo, R. (2005). "Spectral Methods for Lifetime Prediction under Wide-Band Stationary Random Processes", International Journal of Fatigue, Vol 27, No 8, pp 867-877. crossref(new window)

Choung, J.M., Joung, J.H., Choo, M.H. and Yoon, K.Y. (2007). "Development of Fully Stochastic Fatigue Analysis Program for Offshore Floaters", Journal of the Society of Naval Architects of Korea, Vol 44, No 4, pp 425-438. crossref(new window)

Dirlik, T. (1985). Application of Computers in Fatigue Analysis, PhD thesis, University of Warwick.

Hino, M. (2000). Spectrum Analysis, Translated by Kim, N.H. and Shim, K.S., Sciencebook Press: Seoul.

Lim, Y.C., Kim, K.S. and Choung, J.M. (2011). "Fatigue Damage Combination for Spread Mooring System under Stationary Random Process with Bimodal Spectrum Characteristics", Journal of the Society of Naval Architects of Korea, Vol 47, No 6, pp 813-820. crossref(new window)

Matsuishi, M. and Endo, T. (1968). Fatigue of Metals Subjected to Varying Stress, Japan Society of Mechanical Engineers.

Miner, M.A. (1945). "Cumulative Damage in Fatigue", Trans. ASME, J. Applied Mechanics, Vol 67, pp A159-A164.

Rychlik, I. (1987). "A New Definition of the Rainflow Cycle Counting Method", International Journal of Fatigue, Vol 9, No 2, pp 119-121. crossref(new window)

Wirsching, P.H. and Light, C.L. (1980). "Fatigue under Wide Band Random Stresses", Journal of the Structural Division, Vol 106, No 7, pp 1593-1607.