摘要
为研究风力机在湍流风与地震联合作用下的动力学特性,本文基于开源软件FAST和Wolf理论建立风力机地震动力学仿真模型.通过考虑正常运行、一直停机和地震诱导停机三种不同的运行方式,以及150种不同强度地震运动,从而分析气动阻尼及地震强度对结构响应的影响。结果表明:塔顶位移在低强度地震工况受气动阻尼影响较大,此时结构变形量是造成塔顶位移发生变化的主要原因。塔顶振动加速度最大值及塔顶最大位移与设计地震加速度峰值之间均为明显的线性关系,且与系统地震响应系数成正比。基于地震响应系数提出了一种非线性的地震载荷预估模型,通过与相关认证机构提出的标准比较,发现本文提出的模型预估精度更高,可更精确地反映地震强度与风力机结构动力学响应之间的关系。本文结果可为相关标准的完善提供较高的参考价值。
In order to analyse the dynamic characteristics of wind turbine on turbulent wind coupled with earthquake. The seismic simulation system for wind turbine is established by open-source code FAST and Wolf theory. Running, parked and emergency shutdown triggered by strong earthquake scenarios are considered to analyse the impact of aerodynamic damping. For the analysis of influence of earthquake intensity, 150 different intensities seismic motion are synthesised. The results show that aerodynamic damping has a great influence on tower-top displacement under low intensity seismic excitation. The key participation of displacement is structural deformation. The maxima of displacement and acceleration of tower-top increase linearly with the peak of design ground acceleration. These are proportional to the coefficient of wind turbine system for seismic excitation. This paper provide an improved formulation for evaluating seismic load based on that coefficient. With comparing to the guidelines of relative standards, this formulation can more accurately evaluate the actual seismic load. The relation between earthquake intensity and wind turbine seismic behaviour can be revealed more clearly. These new findings would of relative specifications. provide valuable reference for the improvement
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2017年第12期2588-2594,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51676131
No.11402148)
上海市科委资助项目(No.13DZ2260900)
关键词
风力机
气动阻尼
地震强度
动力学特性
wind turbine
aerodynamic damping
earthquake intensity
dynamic behaviour
