风力机地震诱导机舱振动非线性特性分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (23) : 190-196.

论文

风力机地震诱导机舱振动非线性特性分析

刘中胜1，杨阳1，李春1,2，邹锦华1，袁全勇1

作者信息 +

Nonlinear characteristics of wind turbines’seismic induced nacelle vibration

LIU Zhongsheng1,YANG Yang1,LI Chun1,2,ZOU Jinhua1,YUAN Quanyong1

Author information +

文章历史 +

摘要

基于开源软件FAST和Wolf土-构耦合模型，通过自编程开发了风力机地震动力学仿真模块，与文献提出的Seismic工具进行比较，验证了所建立的风力机地震动力学仿真模型的可靠性。在此基础上，计算了5种地震运动下三台不同功率大小的风力机地震动力学响应，并基于分形和混沌理论分析了地震诱导振动特性。结果表明：地震诱导振动具有明显的非平稳特征，且大型风力机必须考虑风-震耦合效应。地震诱导振动时程曲线分形维数介于1.6~1.8之间，表现较高的自相似性和长程相关性。对于风-震耦合效应较弱的小型风力机，振动曲线分形维数与地震强度之间具有较高的关联性。地震诱导振动表现为明显的混沌特征，为非周期性和非完全随机的非平稳振动过程。风-震耦合效应较强的风力机，地震诱导振动时程曲线最大Lyapunov指数与地震强度之间存在较大的相关性，且风-震耦合效应越强，振动可预测时长越短，振动不稳定性越强。

Abstract

The seismic dynamic simulation module for wind turbines was developed with self-programming based on the open-source code FAST and Wolf soil-structure interaction model.Compared with the Seismic Tool published in reference,the reliability of the established wind turbines’seismic dynamic simulation model was verified.The seismic dynamic responses of 3 wind turbines with different powers under 5 earthquake excitations were computed.The fractal and chaos theories were employed to analyse their seismic induced vibrations’nonlinear characteristics.The results showed that wind turbines’seismic induced nacelle vibrations have obvious nonstationary features,the wind-earthquake interaction effect must be considered for large-scale wind turbines; the fractal dimensions of seismic induced vibration acceleration time history curves are within a range of 1.6 to 1.8 with higher self-similarity and long-range correlations; for small wind turbines with weaker wind-earthquake interaction effect,there is a higher relevance between the vibration curves’fractal dimensions and earthquake intensity; obvious chaotic characteristics can be observed from seismic induced nacelle vibrations; the seismic induced vibrations are aperiodic and non-completely-random non-stationary vibration processes; for wind turbines with strong wind-earthquake interaction effect,there is a larger relevance between the maximum Lyapunov exponents of seismic induced vibration time history curves and earthquake intensity; the stronger the wind-earthquake interaction effect,the shorter the time length to predict vibration,and the stronger the vibration instability.

导出引用

刘中胜1，杨阳1，李春1,2，邹锦华1，袁全勇1. 风力机地震诱导机舱振动非线性特性分析[J]. 振动与冲击, 2018, 37(23): 190-196

LIU Zhongsheng1,YANG Yang1,LI Chun1,2,ZOU Jinhua1,YUAN Quanyong1. Nonlinear characteristics of wind turbines’seismic induced nacelle vibration[J]. Journal of Vibration and Shock, 2018, 37(23): 190-196

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