Abstract
The paper does research on top flange fatigue damage of large-scale wind turbine generator. It establishes finite element model of top flange connection system with finite element analysis software MSC. Marc/Mentat, analyzes its fatigue strain, implements load simulation of flange fatigue working condition with Bladed software, acquires flange fatigue load spectrum with rain-flow counting method, finally, it realizes fatigue analysis of top flange with fatigue analysis software MSC. Fatigue and Palmgren-Miner linear cumulative damage theory. The analysis result indicates that its result provides new thinking for flange fatigue analysis of large-scale wind turbine generator, and possesses some practical engineering value.
Highlights
Top flange of wind turbine generator is a key component connecting tower and main frame, it bears various alternating load from the top of wind turbine generator including wind load, dead-weight of generator etc., and fatigue damage occurs, flange fatigue damage directly influences on performance of entire WTGS, fatigue analysis of top flange plays a significant role of WTGS structure design
The paper takes top flange of some MW-level wind power generator as example, and firstly establishes finite element model of top flange connection system with finite element analysis software MSC.Marc/Mentat, analyzes fatigue strain of top flange, corrects S-N curve line 1 of flange materials based on GL norm, realizes simulation of flange fatigue working condition with WTGS design software Bladed, and obtains flange fatigue load spectrum in connection with rain-flow counting method, at last, it analyzes flange fatigue damage with fatigue analysis software MSC.Fatigue and Palmgren-Miner linear cumulative damage law
The paper builds up top flange connection system in touch with finite element model by MSC.Marc/Mentat, model division adopts 8 nodes, hexahedron and No.7 unit, total units are 35,648, and total nodes are 389,788
Summary
Top flange of wind turbine generator is a key component connecting tower and main frame, it bears various alternating load from the top of wind turbine generator including wind load, dead-weight of generator etc., and fatigue damage occurs, flange fatigue damage directly influences on performance of entire WTGS, fatigue analysis of top flange plays a significant role of WTGS structure design. Domestic and foreign wind power manufacturing enterprises firstly establish simulation model of components with common fatigue analysis method during design process of WTGS, ensure fatigue life of component in combination of engineering experience, this requires design staffs to utilize simulation software effectively, and possess rich and practical engineering experience, the advantages of certification authority embodies as well [1]. The paper takes top flange of some MW-level wind power generator as example, and firstly establishes finite element model of top flange connection system with finite element analysis software MSC.Marc/Mentat, analyzes fatigue strain of top flange, corrects S-N curve line 1 of flange materials based on GL norm, realizes simulation of flange fatigue working condition with WTGS design software Bladed, and obtains flange fatigue load spectrum in. Connection with rain-flow counting method, at last, it analyzes flange fatigue damage with fatigue analysis software MSC.Fatigue and Palmgren-Miner linear cumulative damage law
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