Reducing Reliability Uncertainties for Marine Renewable Energy
Abstract
:1. Introduction
2. Reliability Assessment within the DTOcean Tool
2.1. DTOcean Design Tool Overview
2.2. Assessment Method
2.3. Data Provision
Environment | Factor | Description |
---|---|---|
Ground, benign | 1.0 | Non-mobile, temperature and humidity controlled environment, readily maintainable |
Naval, sheltered | 5.0 | Sheltered or below deck conditions |
Naval, unsheltered | 16.0 | Unprotected, surface equipment exposed to weather conditions and salt water immersion |
2.4. Uncertainty
Application Area | Technology Status | ||
---|---|---|---|
1 (Proven) | 2 (Limited Field History) | 3 (New or Unproven) | |
1 (known) | 1 | 2 | 3 |
2 (new) | 2 | 3 | 4 |
3. Improving Reliability Predictions through Component Reliability Testing
3.1. Testing Facilities: The South West Mooring Test Facility (SWMTF) and Dynamic Marine Component Test Facility (DMAC)
3.2. Reliability Assessment: A Case Study to Review Safety Factors in Mooring Design
- Numerical modelling using finite element software
- Accelerated testing using DMaC
- Field trials at the SWMTF.
Shackle | Exposure Level | Failure Location and Type | Log10 Load Cycles |
---|---|---|---|
10 | Low | None | 3.70 |
11 | Low | None | 3.70 |
4 | Medium | None | 4.29 |
5 | Medium | None | 4.29 |
6 | Medium | Break (bow) | 4.29 |
7 | High | Fatigue crack (pin) | 4.39 |
8 | High | Fatigue crack (pin) | 4.39 |
9 | High | Break (centre of pin) | 4.39 |
3.3. Synthetic Rope Yarn Durability Assessment
Yarn Condition | Mean Load (g/dTex) | Log10 Cycles to Failure | ||
---|---|---|---|---|
Minimum | Maximum | Average | ||
New | 0.12 | 4.69 | 5.09 | 4.87 |
0.21 | 3.62 | 4.26 | 4.06 | |
0.31 | 3.24 | 3.71 | 3.45 | |
0.40 | 2.61 | 3.04 | 2.81 | |
Aged | 0.12 | 3.4 | 4.95 | 4.07 |
0.21 | 1.48 | 3.22 | 2.17 | |
0.31 | 1.30 | 2.79 | 1.79 | |
0.41 | 1.34 | 2.15 | 1.74 |
Yarn Condition | Log10 Cycles to Failure | R2 |
---|---|---|
New | −7.2396T + 5.6824 | 0.9345 |
Aged | −7.7221T + 4.479 | 0.5542 |
Cordage Institute [33] | - |
3.4. The Value of Physical Component Test Data to Reliability Prediction
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Weller, S.D.; Thies, P.R.; Gordelier, T.; Johanning, L. Reducing Reliability Uncertainties for Marine Renewable Energy. J. Mar. Sci. Eng. 2015, 3, 1349-1361. https://doi.org/10.3390/jmse3041349
Weller SD, Thies PR, Gordelier T, Johanning L. Reducing Reliability Uncertainties for Marine Renewable Energy. Journal of Marine Science and Engineering. 2015; 3(4):1349-1361. https://doi.org/10.3390/jmse3041349
Chicago/Turabian StyleWeller, Sam D., Philipp R. Thies, Tessa Gordelier, and Lars Johanning. 2015. "Reducing Reliability Uncertainties for Marine Renewable Energy" Journal of Marine Science and Engineering 3, no. 4: 1349-1361. https://doi.org/10.3390/jmse3041349
APA StyleWeller, S. D., Thies, P. R., Gordelier, T., & Johanning, L. (2015). Reducing Reliability Uncertainties for Marine Renewable Energy. Journal of Marine Science and Engineering, 3(4), 1349-1361. https://doi.org/10.3390/jmse3041349