在考虑旋转软化效应的条件下,研究了风力发电机叶片在不同转动状态下的挥舞、摆振、扭转及耦合振动.结果表明:叶片各阶振动频率随转动速度的增大而增大,旋转软化导致振动频率相应降低;旋转软化对低频摆振的影响很大,对其他振动模态影响较小.随着旋转速度的变化,叶片各阶振动频率的变化幅度也不同,会导致相互之间的耦合振动.耦合振动时,扭转振动模态中含有挥舞振动模态,挥舞振动模态中又含有扭转振动模态.耦合振动具有更大的破坏性.%Taking account of the effect of spin softening, the shaking, swing, torsion and coupled vibration of the wind turbine blade were studied under different rotational conditions. Results show that the blade vibration frequencies increase with rising rotating velocity, while spin softening results in decrease of the vibration frequencies. Spin softening has great influence on low frequency swing, but has little influence on other vibrating mode. With the variation of rotating velocity, various order vibration frequencies of blade change at different rates, during which coupled vibration may occur. In coupled vibration, shaking mode is contained in the torsion mode, and torsion mode is also contained in the shaking mode. Coupled vibration is generally more destructive.
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