RESEARCH ON LAPLACE DOMAIN METHOD FOR DYNAMIC RESPONSE PREDICTION OF OFFSHORE SUBSTATION

Sun Zhenzhou; Chen Jiefeng; Cui Ying; Lu Hongchao

doi:10.19912/j.0254-0096.tynxb.2020-0998

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (5) : 270-277. DOI: 10.19912/j.0254-0096.tynxb.2020-0998

RESEARCH ON LAPLACE DOMAIN METHOD FOR DYNAMIC RESPONSE PREDICTION OF OFFSHORE SUBSTATION

Sun Zhenzhou^1,2, Chen Jiefeng², Cui Ying³, Lu Hongchao⁴

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Abstract

The vibration response analysis and prediction of offshore substation are of great significance to its safe operation. The accuracy of traditional time domain dynamic response analysis method depends on the calculation time step, and frequency domain method can only obtain the steady-state response of the structure. A novel dynamic response prediction method based on Laplace transform is proposed to analyze the dynamic response in this paper. The method decouples the vibrating differential equation to obtain the corresponding decoupled vibrating equations, and implements Laplace transform to those equations. Meanwhile, the modal force is decomposed using complex exponential decomposition method to obtain the corresponding poles and residues. Then, the poles and residues of response can be calculated using limit operation. The dynamic response of offshore substation can be obtained by implementing inverse Laplace transform. The method can consider the initial conditions of offshore substation and avoid the error caused by time domain integration. A cantilever beam model and a jacket type offshore substation model are used to survey the performance of the proposed method, which show the correctness of dynamic response prediction.

Key words

offshore wind power / offshore substation / vibration analysis / Laplace transforms / complex exponential decomposition / dynamic response prediction

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Sun Zhenzhou, Chen Jiefeng, Cui Ying, Lu Hongchao. RESEARCH ON LAPLACE DOMAIN METHOD FOR DYNAMIC RESPONSE PREDICTION OF OFFSHORE SUBSTATION[J]. Acta Energiae Solaris Sinica. 2022, 43(5): 270-277 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0998

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