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.

CN103399971AInactive Publication Date: 2013-11-20CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-11-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

Provided is a fan tower inherent frequency analyzing method based on conservation of mechanical energy. According to the method, a tower is regarded as a beam of a variable cross-section with one end fixed and the other end having concentrated mass and inertia moment, the fan tower is divided into a few sections, each section is signified by a constant-section beam, the rigidity of the beam is determined by adopting an equivalent rigidity method, a certain offset distance exists between a top mass center and the center of the beam, the mentioned parameters are regarded as the analyzing basis of the fan tower, and influences of relative parameters on the inherent frequency of the tower are determined by determining a first stage bending inherent frequency analyzing model and a first stage torsional inherent frequency analyzing model respectively.
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Description

technical field

[0001] The invention relates to a method for analyzing the performance of a fan, in particular to a method for predicting the first-order natural frequency of a large-scale fan tower, which is mainly used for the analysis and calculation of the first-order natural frequency of a large-scale fan tower. Background technique

[0002] In the development and design of large-scale wind turbines, it is very necessary to study the natural frequency of the unit including the tower. The tower is mainly used to support the mechanical parts and power generation system of the wind turbine, and bear the force of the wind wheel and the force of the wind on the tower. Since the rotation of the wind wheel will generate a periodic excitation force within a certain frequency range on the tower, it is necessary to calculate and analyze the inherent characteristics of the tower to determine whether it is possible to avoid the resonant frequency region and to perform a calculation...

Examples

Embodiment 1

[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...