Method for Determining Natural Frequency of Reinforced Concrete-Steel Composite Fan Tower
A technology of reinforced concrete and wind turbine towers, which is applied in the monitoring of wind turbines, the configuration of installation/supporting wind turbines, wind turbines, etc., and can solve the problems of high computer requirements and low modeling efficiency
Active Publication Date: 2020-05-12
SHANGHAI ELECTRIC POWER DESIGN INST
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[0004] In view of the above-mentioned defects of the prior art, the technical purpose of the present invention is to provide a method for determining the natural frequency of the reinforced concrete-steel composite fan tower, to solve the problem of low modeling efficiency of the finite element method and high requirements for the computer
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[0035] The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.
[0036] Taking a reinforced concrete-steel composite cylindrical tower as an example, determine its natural frequency value f: the reinforced concrete tower 2 at the lower part of the composite fan tower, the height h 1 = 60m, the upper part is steel tower 1, height h 2 = 58.5m. The section of reinforced concrete tower 2 decreases linearly along the height, and the outer radius of the ring at the bottom is r 1 =4m, the outer radius of the top ring r 2 =2.18m, reinforced concrete tower 2 has uniform wall thickness, thickness t=0.3m, C60 concrete is used, elastic modulus E c =3.6×10 10 Pa; the upper part of the combined fan tower is a steel tower 1, the height h 2 =58.5m, the section decreases gradually along the height, and the ...
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The invention discloses a method for determining the inherent frequency of a reinforced concrete-steel combined fan tower frame. The method comprises the steps that 1, the bottom cylinder wall outer circle radius r1, the top cylinder wall outer circle radius r2 and the total height h1 of a reinforced concrete tower frame are determined; 2, the bottom cylinder wall outer circle radius r3, the top cylinder wall outer circle radius r4 and the total height h2 of a steel tower frame are determined; 3, the equivalent wall thickness t of the tower frame or the equivalent wall thickness t1 of the reinforced concrete tower frame and the equivalent wall thickness t2 of the steel tower frame are calculated; 4, the total mass m of fan equipment on the top of the combined fan tower frame is determined;5, when the reinforced concrete tower frame is made of reinforced concrete, the elasticity modulus of the material is determined as Ec, and when the steel tower frame is made of steel, the elasticitymodulus of the material is determined as Es; and 6, the inherent frequency of the reinforced concrete-steel combined fan tower frame is calculated. According to the method for determining the inherent frequency of the reinforced concrete-steel combined fan tower frame, the inherent frequency of a fan combined tower frame system can be quickly determined without needing modeling, and a certain precision is achieved.
Description
technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for determining the natural frequency of a reinforced concrete-steel combined fan tower. Background technique [0002] At present, there is a contradiction between wind resource areas and consumption areas in my country's wind power development: in areas with abundant wind resources, their own power demand is small, and the generated energy is difficult to send or consume locally; while in the central and eastern regions with large power demand, wind The resources are poor and belong to low wind speed areas. In low-altitude areas, the general wind speed increases with the increase of the height from the ground. If you want to develop wind power in low-wind speed areas, you can raise the wind turbine tower to allow the wind turbine to obtain more wind energy and increase the power generation of the wind turbine. The reinforced concrete-steel tower is one of ...
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IPC IPC(8): F03D13/20F03D17/00
CPCY02E10/72Y02E10/728
Inventor 文锋杨帆吴守城
Owner SHANGHAI ELECTRIC POWER DESIGN INST