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Reliability Assessment of Water Hydraulic-Drive Wave-Energy Converters

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  • Hua Liu

    (Department of Military Facilities, Army Logistics University of PLA, Chongqing 401331, China)

  • Weijun Wang

    (Institution of systems engineering, Academy of Military Sciences of PLA, Beijing 100141, China)

  • Shuai Tang

    (Institution of systems engineering, Academy of Military Sciences of PLA, Beijing 100141, China)

  • Longbo Mao

    (Institution of systems engineering, Academy of Military Sciences of PLA, Beijing 100141, China)

  • Hongju Mi

    (Department of Military Facilities, Army Logistics University of PLA, Chongqing 401331, China)

  • Guoping Zhang

    (Department of Military Facilities, Army Logistics University of PLA, Chongqing 401331, China)

  • Jun Liu

    (Department of Military Facilities, Army Logistics University of PLA, Chongqing 401331, China)

Abstract

The main objective of the current paper is to determine fatigue critical details of wave-energy converters (WECs) and to evaluate their reliability. For this purpose, a new model of a water-hydraulic drive WEC is designed based on the IPS (company Interproject Service) buoy working principle, and the hydrodynamic frequency domain analysis method is carried out accordingly. A reliability assessment method, which combines the stress-number (SN) curves approach and linear damage cumulative theory, has been developed specifically for the proposed WEC. In order to obtain the stochastic wave load spectrum, 22 years of wave data of the intended deployment site (South China Sea), covering the span of 1988–2009, were analyzed, discussed and processed. A finite element analysis model is also established to calculate the maximum Von Mises stress of the fatigue critical component. The reliability indices and configuration parameters of the water hydraulic-drive WEC are obtained by applying first order reliability method, considering the uncertainty of the model parameters and the fatigue limit state. Optimization of configuration parameters is also developed based on the reliability method for the sake of approaching the expected service life. The results show that the fatigue life of the water turbine can reach the design service life of 20 years as the configuration parameters meet the specific condition. The cumulative reliability index and annual reliability index are recommended as 2.1 and 3.5, respectively.

Suggested Citation

  • Hua Liu & Weijun Wang & Shuai Tang & Longbo Mao & Hongju Mi & Guoping Zhang & Jun Liu, 2019. "Reliability Assessment of Water Hydraulic-Drive Wave-Energy Converters," Energies, MDPI, vol. 12(21), pages 1-21, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4189-:d:282981
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    References listed on IDEAS

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