基于五点等效法的海上风机运行荷载识别研究

可靠的荷载时程是评估风机剩余生命周期和疲劳的关键因素,但长期的荷载监测不可行.本文针对海上风机结构振动特性和荷载特点,采用五点等效法识别风机运行荷载.该方法克服了初始值影响,降低误差传递和累计误差,提高荷载识别稳定性和鲁棒性.首先采用弹质阻尼模型验证识别荷载的准确性和精度,并讨论噪声对识别方法的影响;然后将识别方法应用...

Operational load identification for offshore wind turbines based on five points method

Reliable load information is a key factor in evaluating the fatigue and rest life cycle, but continual load monitoring is often difficult in engineering practice. Aimed at the dynamic characteristics and load features of offshore wind turbines, this paper presents a time-domain load identification technique, based on the five points method, which can eliminate the influence of initial value, suppress the influence of error transfer, and reduce accumulative errors so as to improve its stability and robustness. First, this method is verified via application to several validation cases using the spring-mass damping model; then, it is applied to a 5 MW monopile offshore wind turbine provided by Facility for Accelerated Service Testing (FAST). The results show that the method can identify turbine operational loads accurately and stably, with its results not influenced by wind speed or operation strategy control.