A study on an improved stochastic design wave approach based on the probability model optimized for maximum structural responses

Zhou Daocheng; Jiang Liang; Wang Bin; Gao Shan

doi:10.12284/hyxb20250119

Volume 47 Issue 12

Dec. 2025

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Zhou Daocheng，Jiang Liang，Wang Bin, et al. A study on an improved stochastic design wave approach based on the probability model optimized for maximum structural responses[J]. Haiyang Xuebao，2025, 47(12)：60–69 doi: 10.12284/hyxb20250119

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A study on an improved stochastic design wave approach based on the probability model optimized for maximum structural responses

doi: 10.12284/hyxb20250119

1.
School of Civil Engineering and Transportation, Northeast Forestry University, Harbin 150040, China
2.
PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, China

Received Date: 2025-09-15
Rev Recd Date: 2025-11-24

Available Online: 2025-12-09

Publish Date: 2025-12-31

Abstract

Abstract

The stability and safety of floating offshore wind turbine (FOWT) platforms in deep-sea and far-sea environments are crucial for the entire system. Currently, the stochastic design wave method is the conventional approach for structural design; however, its assumption that the maximum structural response follows a Rayleigh distribution may not accurately reflect reality. To address this, this paper proposes an improved stochastic design wave method that reasonably considers the stochastic characteristics of extreme structural responses. Specifically, this method establishes a probability model for the local short-term maximum distribution using samples of the maximum structural response derived from the mean zero-crossing period. Subsequently, a global probability model for the maximum value over the total duration is derived to determine the design wave parameters. A 5 MW Braceless FOWT is selected as the case study for a comparative analysis of wave loads and stresses using both the conventional and improved methods. The results indicate that the improved method more accurately characterizes the stochastic characteristics of extreme responses, and thus the calculated structural stress aligns better with actual conditions. Notably, the conventional stochastic design wave method is found to underestimate the structural stress with a maximum error of 4.63%, which implies that structures designed with this approach may pose potential safety hazards. The findings of this study have significant implications for the structural design and safety assessment of similar FOWT platforms.
- floating offshore wind turbine platform,
- wave loads,
- design wave method,
- maximum structural response,
- extreme value distribution

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References

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