Offshore Monopile Vulnerability Assessment via Dynamic Load Simulation
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Solution Overview
Problem
Existing methods for analyzing the vulnerability of mono-pile foundations of offshore wind turbines cannot accurately determine the failure probability during a designed service period, nor do they accurately reflect the dynamic response of these foundations, and they fail to consider the uncertainty of ocean soil properties.
Innovation Solution
A method involving the collection of offshore wind farm location data and wind-wave characteristic data to simulate a wind-wave time course, determining a wind-wave dynamic load, and using a 3D finite element model with lateral soil resistance data to generate a dynamic response result, thereby assessing the vulnerability of mono-pile foundations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a load resistance coefficient method based on approximate probability is used to design pile foundations, then the design process is simple, but it cannot give a failure probability of the pile foundation during a designed service period
Solution Approach 1:
The patent replaces the traditional mechanical load resistance coefficient method with a dynamic response-based vulnerability assessment method. This involves using dynamic analysis to calculate the vulnerability of pile foundations under wave and wind loads, providing a more accurate failure probability determination while maintaining practical applicability through standardized procedures and computational tools.
2Device complexity
If a quasi-static method is used to analyze the vulnerability of mono-pile foundations, then the analysis process is simpler, but it cannot accurately reflect an actual dynamic response of pile foundations
Solution Approach 1:
The patent applies dynamic analysis methods to model the time-dependent response of mono-pile foundations to wave and wind loads. This includes using dynamic response coefficients, time-history analysis, and computational fluid dynamics to accurately capture the dynamic behavior of the foundations, replacing simpler quasi-static methods while maintaining manageable complexity through standardized dynamic analysis procedures.
3Reliability
If reliability theory probability calculation method is used to analyze ocean soil uncertainty, then the analysis is comprehensive, but the calculation is cumbersome and difficult to apply in practice
Solution Approach 1:
The patent transforms the complex reliability theory probability calculations into a more practical framework by changing the approach to soil uncertainty analysis. This involves using standardized probability distribution parameters for soil properties, combining them with dynamic response calculations, and employing computational tools to simplify the overall calculation process while maintaining comprehensive uncertainty consideration.
Data Source
AI summary
A method and apparatus for evaluating vulnerability of monopile foundations of offshore wind turbines are provided. The method includes collecting offshore wind farm location data and wind-wave characteristic data, and simulating a wind-wave time course according to the offshore wind farm location data and the wind-wave characteristic data; determining a wind-wave dynamic load based on the wind-wave course; obtaining lateral soil resistance data of monopile foundations with a plurality of rock-soil strength parameters, and inputting the wind-wave dynamic load into a 3D finite element model; using the lateral soil resistance data of monopile foundations with a plurality of rock-soil strength parameters as boundary conditions of the 3D finite element model; and giving a limit state of monopile foundations, and determining vulnerability of monopile foundations on basis of the dynamic response result of the monopile foundations and the limit state of monopile foundations.