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Title |
Damage Estimation Method for Wind Turbine Tower Using Modal Properties
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Keywords |
타워 ; 풍력발전기 ; 손상추정 ; 고유진동수 ; 모드형상 Tower ; Wind Turbine ; Damage Estimation ; Natural Frequency ; Mode Shape |
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Abstract |
A damage estimation method of wind turbine tower using natural frequency and mode shape is presented for effective condition monitoring. Dynamic analysis for a wind turbine was carried out to obtain the response of tower from which modal properties were identified. A neural network was learned based on training patterns generated by the changes of natural frequency and mode shape due to various damages. The changes of modal property were calculated using a program for modal parameter estimation. Damage locations and severities could be successfully estimated for 10 damage cases including multi-damage cases using the trained neural network. The damage severities for very small damages generally tends to be slightly under-estimated however, the identified damage locations agreed reasonably well with the accurate locations. Enhancement of the estimation result for very small damage and verification of the proposed method through experiment will be carried out by further study.
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