Fan tower inherent frequency analyzing method based on conservation of mechanical energy
A natural frequency, energy conservation technology, used in special data processing applications, instruments, electrical digital data processing, etc.
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[0070] An analysis method of the natural frequency of the tower based on the conservation of mechanical energy, see figure 1 , The tower of a megawatt wind turbine is generally a cone-shaped steel structure, the top is connected to the yaw system, and the bottom is fixed to the base. The tower is connected by a multi-section tower through flanges. The tower tube has a door hole. Neglecting the influence of flanges and door holes, the tower is regarded as a fixed end with a concentrated mass at the other end and moment of inertia The variable cross-section beam, and divide the fan tower into three sections, each section is represented by a beam of equal section; the three sections are equally divided; the stiffness of each beam is determined by the conventional equivalent stiffness method, and the center of mass at the top is the same as There is an offset distance between beam centers The specific parameters are: the height of the tower is 67.2m, the material is steel, t...
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