含聚酯缆绳锚泊系统疲劳分析及布置方位优化

Fatigue Life Analysis and Orientation Optimization of Mooring System with Polyester Cables

为更合理地布设兆瓦级波浪能发电装置及其锚泊系统,开展浅水域含聚酯缆绳锚泊系统的疲劳损伤分析及布置方位优化研究。首先,在ANSYS-AQWA软件中建立发电装置与锚泊系统的耦合分析模型,采用时域分析方法计算各锚泊线在不同短期海况下动态响应;其次,采用雨流计数法,计算得到相应的锚泊线的疲劳载荷谱;然后,考虑波浪玫瑰图,基于Miner疲劳累积损伤理论计算各锚泊线在长期海况条件下的疲劳损伤;最后,设计4种对能量捕获有利的波浪能装置布置方案。研究发现不同的布置方案中锚泊线疲劳寿命差异较大,故建议在工程中,除了要考虑能量捕获效率外,还应计算装置的布置对锚泊系统疲劳寿命的影响,从而得到相对最优设计。

To reasonably arrange the megawatt wave energy converter and its mooring system,this paper analyzes and studies the fatigue damage and orientation optimization of the mooring system with polyester cables.Firstly,it establishes the coupling analysis model between wave energy converter and the mooring system in ANSYS-AQWA software,and uses the the time-domain analysis method to calculate dynamic response of each mooring line under different short-term sea conditions.Secondly,it uses the rain-flow counting method to calculate the fatigue load spectrum of the mooring line.Then,considering wave rose diagram,the paper calculates the fatigue damage of each mooring line under long-term sea conditions based on Miner linear fatigue cumulative damage theory.Finally,it designs four kinds of wave energy converter schemes for capturing energy.It is found that the fatigue life of the mooring line is greatly affected by different layout schemes.Therefore,it is suggested that in the engineering,besides considering the energy capture efficiency,the influence of the layout on the fatigue life of the mooring system should be calculated to obtain the relative optimal design.