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Title: The Effect of Environmental Contour Selection on Expected Wave Energy Converter Response

Abstract

A wave energy converter must be designed to both maximize power production and to ensure survivability, which requires the prediction of future sea states. It follows that precision in the prediction of those sea states should be important in determining a final WEC design. One common method used to estimate extreme conditions employs environmental contours of extreme conditions. This report compares five environmental contour methods and their repercussions on the response analysis of Reference Model 3 (RM3). The most extreme power take off (PTO) force is predicted for the RM3 via each contour and compared to identify the potential difference in WEC response due to contour selection. The analysis provides insight into the relative performance of each of the contour methods and demonstrates the importance of an environmental contour in predicting extreme response. Ideally, over-predictions should be avoided, as they can add to device cost. At the same time, any "exceedances," that is to say sea states that exceed predictions of the contour, should be avoided so that the device does not fail. For the extreme PTO force response studied here, relatively little sensitivity to the contour method is shown due to the collocation of the device's resonance with amore » region of agreement between the contours. However, looking at the level of observed exceedances for each contour may still give a higher level of confidence to some methods.« less

Authors:
 [1];  [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1477322
Report Number(s):
SAND-2018-10955J
Journal ID: ISSN 0892-7219; 668532
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Offshore Mechanics and Arctic Engineering
Additional Journal Information:
Journal Volume: 141; Journal Issue: 1; Journal ID: ISSN 0892-7219
Publisher:
ASME
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Edwards, Samuel J., and Coe, Ryan G. The Effect of Environmental Contour Selection on Expected Wave Energy Converter Response. United States: N. p., 2018. Web. doi:10.1115/1.4040834.
Edwards, Samuel J., & Coe, Ryan G. The Effect of Environmental Contour Selection on Expected Wave Energy Converter Response. United States. doi:10.1115/1.4040834.
Edwards, Samuel J., and Coe, Ryan G. Mon . "The Effect of Environmental Contour Selection on Expected Wave Energy Converter Response". United States. doi:10.1115/1.4040834. https://www.osti.gov/servlets/purl/1477322.
@article{osti_1477322,
title = {The Effect of Environmental Contour Selection on Expected Wave Energy Converter Response},
author = {Edwards, Samuel J. and Coe, Ryan G.},
abstractNote = {A wave energy converter must be designed to both maximize power production and to ensure survivability, which requires the prediction of future sea states. It follows that precision in the prediction of those sea states should be important in determining a final WEC design. One common method used to estimate extreme conditions employs environmental contours of extreme conditions. This report compares five environmental contour methods and their repercussions on the response analysis of Reference Model 3 (RM3). The most extreme power take off (PTO) force is predicted for the RM3 via each contour and compared to identify the potential difference in WEC response due to contour selection. The analysis provides insight into the relative performance of each of the contour methods and demonstrates the importance of an environmental contour in predicting extreme response. Ideally, over-predictions should be avoided, as they can add to device cost. At the same time, any "exceedances," that is to say sea states that exceed predictions of the contour, should be avoided so that the device does not fail. For the extreme PTO force response studied here, relatively little sensitivity to the contour method is shown due to the collocation of the device's resonance with a region of agreement between the contours. However, looking at the level of observed exceedances for each contour may still give a higher level of confidence to some methods.},
doi = {10.1115/1.4040834},
journal = {Journal of Offshore Mechanics and Arctic Engineering},
number = 1,
volume = 141,
place = {United States},
year = {2018},
month = {8}
}

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Works referenced in this record:

Validation of a lumped-mass mooring line model with DeepCwind semisubmersible model test data
journal, August 2015


Long-term performance estimation of the Spar–Torus-Combination (STC) system with different survival modes
journal, November 2015


A Survey of WEC Reliability, Survival and Design Practices
journal, December 2017

  • Coe, Ryan; Yu, Yi-Hsiang; van Rij, Jennifer
  • Energies, Vol. 11, Issue 1
  • DOI: 10.3390/en11010004