Analysis method of WEC sub-system for hybrid wind-wave energy system based on reconstructed displacements. (15th June 2023)

• Record Type: Journal Article
• Authors: Jiang, Chunyu; Cao, Feifei; Wang, Qi; Shi, Hongda
• Is Part Of: Ocean engineering. Volume 278(2023)
• Publication Date: 2023-06-15
• Subjects: Hybrid wind-wave energy system -- Modal analysis -- Displacement change -- Acceleration; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2023.114268
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: The structural response and modal information of hybrid wind-wave energy system are important evaluation indicators for its design and damage diagnosis, which are crucial for its development. In this paper, a displacement drift term removal method based on Chebyshev polynomials is developed based on the structural acceleration. The problem of difficult displacement measurement at sea is solved, and the displacement is used in the modal parameter identification of the structure, which improves the modal identification accuracy of the hybrid wind-wave energy system. The influence of the motion and number of buoys on the dynamic response and dynamic characteristics of the structure is discussed. The research results show that the identification results of modal parameters using displacement are more accurate than acceleration, and with the increase of the number of wave energy devices, the frequency of each order of the structure decreases. The displacement of the structure increases with the wave height, at a rate that depends on the number of buoys. The results show that the method developed in this paper can be applied to the impact analysis aspects of wave energy devices in hybrid wind-wave energy system, providing theoretical references for its design and development. Highlights: A displacement drift term removal method based on Chebyshev polynomials is proposed. Structural displacements are used in the modal parameter identification of hybrid wind-wave energy systems. A physical model test was conducted in a wave tank with a scale ratio of 1:8. The effect of the motion and number of oscillating buoys to structure is discussed.