Minimizing the displacement of integrated system of wind and tidal turbines based on the soil types under cyclic loads

Navid Majdi Nasab; Alan Wang; Navid Majdi Nasab; Alan Wang

doi:10.3934/geosci.2023028

AIMS Geosciences

2023, Volume 9, Issue 3: 513-527. doi: 10.3934/geosci.2023028

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Minimizing the displacement of integrated system of wind and tidal turbines based on the soil types under cyclic loads

Navid Majdi Nasab ^{1
,
,},
Alan Wang ²

1.
Mechanical Engineering Department, School of Engineering, Manukau Institute of Technology, 2023 Auckland, New Zealand
2.
Auckland Bioengineering Institute, University of Auckland, New Zealand

Received: 11 April 2023 Revised: 21 June 2023 Accepted: 27 June 2023 Published: 17 July 2023

Hybrid offshore platforms are complex structures that need to tolerate cyclic loads. These loads occur when the turbine is working between cut-in and cut-out speeds and depend on the turbine's rotational speeds. However, selecting a proper soil for the structure to be secured in is very important for the stability of the hybrid system. This study aimed to calculate the displacement of an integrated offshore structure capable of supporting a hybrid assembly of one wind plus two tidal turbines under cyclic loads. The monopile has been found to be a suitable foundation type, as the most inexpensive solution in water depths less than 30 meters, for integrating both types of turbines. The deflection of the structure was compared for different types of soil with finite element analysis. Several simulations were conducted using OPTUM G3 software for calculating the stability of each type of soil in the rotational speed range of turbines. The results enable determining the amount of deflection for each soil type. The displacement range for soft clay is 0.0052 to 0.0098 m, and displacement is between 0.007 and 0.0158 m for medium sand. The minimum displacement of firm clay, which is 0.0115 meters at 5 rpm, is higher than all minima of other soil types. Thus, soft clay and medium sand show more stability, and firm clay is less stable in the rotational speed range of the turbines.
- wind,
- friction angle,
- tidal,
- deflection,
- tilt
Citation: Navid Majdi Nasab, Alan Wang. Minimizing the displacement of integrated system of wind and tidal turbines based on the soil types under cyclic loads[J]. AIMS Geosciences, 2023, 9(3): 513-527. doi: 10.3934/geosci.2023028

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Abstract

Hybrid offshore platforms are complex structures that need to tolerate cyclic loads. These loads occur when the turbine is working between cut-in and cut-out speeds and depend on the turbine's rotational speeds. However, selecting a proper soil for the structure to be secured in is very important for the stability of the hybrid system. This study aimed to calculate the displacement of an integrated offshore structure capable of supporting a hybrid assembly of one wind plus two tidal turbines under cyclic loads. The monopile has been found to be a suitable foundation type, as the most inexpensive solution in water depths less than 30 meters, for integrating both types of turbines. The deflection of the structure was compared for different types of soil with finite element analysis. Several simulations were conducted using OPTUM G3 software for calculating the stability of each type of soil in the rotational speed range of turbines. The results enable determining the amount of deflection for each soil type. The displacement range for soft clay is 0.0052 to 0.0098 m, and displacement is between 0.007 and 0.0158 m for medium sand. The minimum displacement of firm clay, which is 0.0115 meters at 5 rpm, is higher than all minima of other soil types. Thus, soft clay and medium sand show more stability, and firm clay is less stable in the rotational speed range of the turbines.

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