Reliability-based design optimization on mobility of deep-seabed test miner using censored data of current speed

Sanghyun Park, Su Gil Cho, Woochul Lim, Saekyeol Kim, Sung Sik Choi, Minuk Lee, Jong Su Choi, Hyung Woo Kim, Chang Ho Lee, Sup Hong, Tae Hee Lee

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Deep-seabed test miner operated by a self-propelled mining system moving on soft soil is an essential device to secure floating and towing performances. The performances of the tracked vehicle are seriously influenced by noise factors such as the shear strength of the seafloor, bottom current, seafloor slope, speed of tracked vehicle, reaction forces of flexible hose, steering ratio, etc. Due to uncertainties related to noise factors, the design of a deep-sea manganese nodules test miner that satisfies target reliabilities is difficult. Therefore, reliability-based design optimization (RBDO) is required to guarantee system reliability under circumstances where uncertainties related to noise factors prevail. Among noise factors, the bottom current, a bimodal distribution, is censored due to the observation limit of measurement devices. Therefore, estimated distribution of the bottom current is inaccurate without considering these characteristics and the result of RBDO cannot be guaranteed. In this paper, we define censored data as unknown values over the limit of observation. If this data is estimated by using Akaike information criterion (AIC) that cannot consider the characteristics of censored data, the distribution of estimated data cannot guarantee accurate reliability. Therefore, censored AIC that can consider the characteristics of data is used to estimate accurate distribution of the bottom current. Finally, RBDO, under circumstances where uncertainties related to noise factors combined censored data are present, is performed on the mobility of a deep-sea manganese nodules test miner.

Original languageEnglish
Pages (from-to)487-494
Number of pages8
JournalOcean and Polar Research
Volume36
Issue number4
DOIs
StatePublished - 2014 Dec 1

Keywords

  • Censored akaike information criterion (censored AIC)
  • Censored data
  • Deep-seabed test miner
  • Reliability-based design optimization

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    Park, S., Cho, S. G., Lim, W., Kim, S., Choi, S. S., Lee, M., Choi, J. S., Kim, H. W., Lee, C. H., Hong, S., & Lee, T. H. (2014). Reliability-based design optimization on mobility of deep-seabed test miner using censored data of current speed. Ocean and Polar Research, 36(4), 487-494. https://doi.org/10.4217/OPR.2014.36.4.487