Research on Vibration Suppression of a Wind Mill

风车减振研究

基本信息

批准号：
16560208
负责人：
ISHIDA Yukio
金额：
$ 2.69万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

As the development of wind mil generation, vibrations and sounds became a serious problem. However, most of the research on wind mills are those related to the generation of the electric power, such as, the shape of blade, number of blades, etc. Recently, the size of the blade becomes large. Some wind mills has a long blade of almost 50 meters. Therefore, very unique vibration problems which are not observed in the ordinary rotating machinery occur. For example, the wind forces at the top position and the bottom position of the blade are different and this difference makes a periodic excitation force. When a blade passes near the pole, a pressure impulse works. Such excitation forces may cause various kinds of vibrations of the blades. We clarified the followings.(1) Due to the periodic excitation force, a harmonic resonance occurs. (2) Since the restoring forces at the top position and the bottom position are different, this system becomes a periodically-excited system. (3) The coexistence of the parametric excitation due to the gravity and the periodic excitation due to wind force causes various kinds of superharmonic resonances. (4) As the stiffness of the blade decreases, the effect of parametric excitation increases. (5) Unstable zone appears when the stiffness of the blades becomes smaller than a certain value due to the periodic excitation.From this research, it became clear that wind turbines has a potential to cause vibrations even if they are made without manufacturing errors.

随着风的发展，振动和声音的发展成为一个严重的问题。但是，关于风厂的大多数研究都是与电力产生有关的研究，例如刀片的形状，叶片的数量等。最近，刀片的大小变大。一些风厂的刀片长近50米。因此，在普通旋转机械中未观察到的非常独特的振动问题。例如，顶部位置和叶片底部位置的风力不同，这种差异使周期性激发力。当刀片在杆附近通过时，压力冲动起作用。这种激发力可能会引起各种叶片的振动。我们阐明了以下内容。（1）由于周期性激发力，会发生谐波共振。（2）由于最高位置和底部位置的恢复力是不同的，因此该系统成为一个定期激发的系统。（3）由于重力和风力引起的周期性激发引起的参数激发的共存会引起各种超锤子共振。（4）随着刀片的刚度降低，参数激发的效果会增加。（5）由于周期性的激发，叶片的刚度变得小于某个值时，就会出现不稳定的区域。从这项研究中，很明显，即使没有制造错误的情况下，风力涡轮机也有可能引起振动。