Mechanical analysis method of wind turbine concrete tower under different wind speed and load conditions

Abstract

The present invention provides a mechanical analysis method for a wind power concrete tower under different wind speed and load conditions, S1: construct a schematic force system for a wind power concrete tower, and perform mechanical force analysis on the tower through a three-dimensional coordinate axis; S2: build a wind load calculation model for the wind power concrete tower body; S3: construct a wind load model for the top of a wind power concrete tower under different working conditions, determine the required working condition model, and use the wind load calculation model for the top of a wind power concrete tower to perform mechanical analysis simulation on the top of the wind power concrete tower under different wind speed and load conditions; S4: construct a load combination calculation model under different wind speed and load conditions, and use the load combination calculation model to construct a mechanical analysis model for a wind power concrete tower. The present invention comprehensively considers the performance of a wind power concrete tower under various design working conditions, comprehensively considers a variety of working conditions and dynamic response aspects, and provides a new method for the mechanical analysis method of a wind power concrete tower.

Description

Technical Field

[0001] The invention relates to the technical field of concrete tower structure engineering, and in particular to a mechanical analysis method for wind power concrete towers under different wind speed and load conditions. Background Art

[0002] As a green energy, wind energy is extremely important in the energy industry. As the supporting structure of wind turbines and impellers, the safety and reliability of the concrete tower structure are key factors in ensuring the normal operation of wind turbines. The design of the tower structure first involves the load effect. In addition to its own gravity, the tower is also subject to wind loads on the tower body and the top of the tower. The wind loads on the tower have special variations. At present, the relevant technical solutions lack a mechanical analysis method for wind power concrete towers under different wind speeds and load conditions. This application uses an isolation method to decompose the calculation of the wind power concrete tower, build a calculation model of the wind power concrete tower, build calculation models under various conditions for the top of the wind power concrete tower, and use a combination structure for different conditions to conduct a complete and comprehensive mechanical analysis of the wind power concrete tower. Summary of the invention

[0003] The present invention provides a mechanical analysis method for a wind power concrete tower under different wind speed and load conditions, and utilizes splitting, model building and load combination analysis under various conditions to analyze the mechanical structure of the wind power concrete tower.

[0004] The mechanical analysis method of wind turbine concrete tower under different wind speed and load conditions includes the following steps:

[0005] S1: Construct a schematic force diagram of the wind power concrete tower and conduct mechanical force analysis on the tower through three-dimensional coordinate axes;

[0006] S2: Build a wind load calculation model for the wind turbine concrete tower body, and use the wind load calculation model for the wind turbine concrete tower body to perform mechanical analysis and simulation on the wind turbine concrete tower body under different wind speeds and load conditions;

[0007] S3: Construct the wind load model of the top of the wind turbine concrete tower under different working conditions, determine the working condition model required for the top of the tower, and use the wind load calculation model of the top of the wind turbine concrete tower to perform mechanical analysis and simulation on the top of the wind turbine concrete tower under different wind speeds and load conditions;

[0008] S4: Construct a load combination calculation model under different wind speeds and load conditions, and use the load combination calculation model to construct a mechanical analysis model of the wind power concrete tower.

[0009] Preferably, S1 sets a coordinate system in three-dimensional space, with the center of the tower bottom as the origin, the tower axis along the Z axis as the positive direction, and the windward side vertically establishes the positive direction of the X axis, to analyze the distribution and action points of the wind power concrete tower in three-dimensional space under different wind speeds and load conditions.

[0010] Preferably, the comprehensive wind load force of the wind power concrete tower is nonlinearly distributed along the tower body, and a calculation formula for the comprehensive wind load force of the tower body is constructed: W wind,total (t) represents the comprehensive wind load, q z,nl (z) represents the wind load at height z, A(z) represents the cross-sectional area of ​​the tower at height z, and R(z,t) represents the response function of the tower at height z and time t; z,nl The calculation formula of (z) is: Where, ∈ is the nonlinear distribution coefficient, H is the total height of the tower, q z (t) is the dynamic wind load; z (t) is calculated as: V z (t) is the wind speed that varies with time, C z (t) is the wind load shape coefficient considering time variation, and ρ represents the air density.

[0011] Preferably, the R(z, t) represents the response function formula of the tower at height z and time t: R(z, t) = w1·R dis (z,t)+w2·R stress (z,t)+w3·R freq (z,t),R dis (z,t) represents the maximum displacement caused by wind load, R stress (z, t) represents the displacement caused by the stress of the tower, R freq (z, t) represents the displacement caused by tower vibration, w1, w2, w3 are weight coefficients; δ(z,τ) represents the tower displacement at height z and change time τ; stress (z,t)=σ max (z,t)-σ min (z,t),σ max (z,t) and σ min (z, t) are the maximum principal stress and the minimum principal stress at height z and time t, respectively; σ(z,ω) is the stress vibration at height z and frequency ω.

[0012] Preferably, the tower top wind load calculation model for building a wind power concrete tower includes a tower top wind load calculation model for the wind power concrete tower under rated wind speed conditions, a tower top wind load calculation model for the wind power concrete tower under cut-out wind speed conditions, a tower top wind load calculation model for the wind power concrete tower under extreme wind speed conditions, and a tower top wind load calculation model for the wind power concrete tower under startup and shutdown conditions.

[0013] Preferably, the calculation model of the wind load on the top of the wind power concrete tower under the rated wind speed condition is W E =k1·W basic-e +k2·W turb +k3·W shear +k4·W top , W E is the wind load on the top of the wind turbine concrete tower under rated wind speed conditions, where W basic-e is the basic wind load on the tower top area under basic wind pressure, W turb is the wind load due to turbulence, W shear Wind load due to wind shear effect, W top is the airflow wind load, k1 is the basic wind load coefficient, k2 is the turbulence influence coefficient, k3 is the wind shear coefficient, and k4 is the airflow influence coefficient;

[0014] The W basic-e is the rated basic wind load Where ρ is the air density, A is the windward area, C D is the drag coefficient, V top is the wind speed at the top of the tower;

[0015] The turbulent wind load W turb =k turb ·W basic , where k turb is the turbulence influence coefficient;

[0016] The wind shear load Among them C shear is the wind shear coefficient, V ref is the wind speed at the reference height, V is the wind speed at the tower top height;

[0017] The air flow wind load k top is the airflow coefficient in the tower top area, A top It is the wind-exposed area of ​​the tower top.

[0018] Preferably, the calculation model of the wind load on the top of the wind power concrete tower under the cut-out wind speed condition is W c =k1·W basic-c +k2·W turb +k3·W shear-c+k4·W top +k5W cut ;

[0019] Said

[0020] Said

[0021] The W cut =W baisc-c Aβ z μ z k cut-out , where β z is the tangential wind vibration coefficient, μ z is the coefficient of variation of wind pressure height;

[0022] The β z =k turb G JZ Z , g is the tangential peak factor, R is the wind vibration factor, B Z is the wind vibration coefficient at height Z.

[0023] Preferably, the calculation model of the wind load on the top of the wind power concrete tower under the extreme wind speed condition is W j =k1·W basic-j +k2·W turb +k3·W shear-j +k4·W top-j , the W j is the total wind load on the top of the tower under extreme wind speed conditions;

[0024] Said

[0025] Said

[0026] Said Where V ext The extreme wind speed.

[0027] Preferably, the tower top wind load calculation model of the wind power concrete tower under the startup and shutdown conditions includes the tower top wind load calculation model W of the wind power concrete tower under the startup and shutdown conditions. start Calculation model of wind load on top of wind turbine concrete tower under shutdown conditions W stop ; said W start =W basic-e ×(1+α start ), where α start is the aerodynamic damping coefficient under starting conditions;

[0028] The W stop =W basic-e ×β stop , where βstop is the aerodynamic damping coefficient under shutdown conditions.

[0029] Preferably, in S4, a load combination calculation model under different wind speed and load conditions is constructed, and by judging the wind speed condition of the tower top wind load calculation model of the wind power concrete tower, the tower top wind load wind speed condition model of the wind power concrete tower is combined with the comprehensive wind load force of the wind power concrete tower, thereby constructing a mechanical analysis model of the wind power concrete tower.

[0030] Compared with the prior art, the technical solution of the present application has the following advantages and effects:

[0031] 1. The present invention constructs a specific calculation formula through the tower body, takes into account the characteristics of wind load changing with height, accurately simulates and predicts the impact of wind load on the tower, and provides a more accurate means of mechanical behavior analysis under different wind speed and load conditions.

[0032] 2. The present invention takes into account the change of wind speed over time and the dynamic response of the tower. By introducing the response function and the weight coefficient, it can evaluate the maximum displacement caused by wind load, the displacement caused by stress and the displacement caused by tower vibration. The method of comprehensively considering the time change and dynamic response improves the prediction accuracy of the tower's stress conditions in the actual wind field, which helps to design a safer and more reliable wind power concrete tower.

[0033] 3. The present invention adopts tower top wind load calculation models under rated wind speed conditions, cut-out wind speed conditions, extreme wind speed conditions, and startup and shutdown conditions to comprehensively evaluate the force analysis model of the combined wind power concrete tower under various operating conditions, providing a more comprehensive mechanical analysis for tower design, helping to optimize the tower structure to adapt to different operating conditions, and enhancing the accuracy and comprehensiveness of tower analysis.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0035] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0037] Figure 1 The mechanical analysis method and steps of wind power concrete tower under different wind speed and load conditions;

[0038] Figure 2 Mechanical analysis of wind turbine concrete tower under different wind speed and load conditions;

[0039] Figure 3 Mechanical analysis of wind turbine concrete tower under different wind speed and load conditions;

[0040] Figure 4 This is a mechanical analysis structure of the top of a wind turbine concrete tower under different wind speeds and load conditions. Specific embodiments

[0041] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0042] It should be understood that the references to "one embodiment" or "this embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "one embodiment" or "this embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0043] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0044] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0045] The term "at least one" in this article is merely a description of the association relationship of associated objects, indicating that there may be three relationships. For example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0046] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0047] Example 1

[0048] This embodiment mainly introduces the specific steps of the mechanical analysis method of wind power concrete tower under different wind speed and load conditions:

[0049] S1: First, establish an accurate 3D model of the wind turbine concrete tower, such as Figure 2 As shown in the figure, the precise three-dimensional model includes the geometric dimensions, material properties and boundary conditions of the tower. The mechanical force analysis of the tower is carried out through the three-dimensional coordinate axis. The coordinate system is set as follows: the center of the bottom of the tower is taken as the origin (0,0,0), the tower axis extends along the positive direction of the Z axis, and the X axis and Y axis represent the horizontal and lateral directions respectively, which are perpendicular to the Z axis;

[0050] S2: Build a tower wind load calculation model, such as Figure 3 As shown in the figure, the model calculates the wind load at different heights based on the wind speed profile and wind body shape coefficient; the comprehensive wind load force of the wind turbine concrete tower is nonlinearly distributed along the tower body, and the calculation formula for the comprehensive wind load force of the tower body is constructed: W wind,total (t) represents the comprehensive wind load, q z,nl (z) represents the wind load at height z, A(z) represents the cross-sectional area of ​​the tower at height z, R(z,t) represents the response function of the tower at height z and time t, R(z,t)=w1·R dis (z,t)+w2·R stress (z,t)+w3·Rfreq (z,t),R dis (z,t) represents the maximum displacement caused by wind load, R stress (z, t) represents the displacement caused by the stress of the tower, R freq (z, t) represents the displacement caused by tower vibration, w1, w2, w3 are weight coefficients; δ(z,τ) represents the tower displacement at height z and change time τ; stress (z,t)=σ max (z,t)-σ min (z,t),σ max (z,t) and σ min (z, t) are the maximum principal stress and the minimum principal stress at height z and time t, respectively; σ(z,ω) is the stress vibration at height z and frequency ω; the q z,nl The calculation formula of (z) is: Where, ∈ is the nonlinear distribution coefficient, H is the total height of the tower, q z (t) is the dynamic wind load; z (t) is calculated as: V z (t) is the wind speed that varies with time, C z (t) is the wind load shape coefficient considering time variation, and ρ represents the air density;

[0051] S3: Construct the tower top wind load model, such as Figure 4 As shown in the figure, the model takes into account the rated wind speed, cut-out wind speed, limit wind speed, and startup and shutdown conditions. For each condition, the corresponding wind load is calculated and its impact on the tower top is evaluated.

[0052] The calculation model of wind load on the top of wind turbine concrete tower under rated wind speed condition is W E =k1·W basic-e +k2·W turb +k3·W shear +k4·W top , W E is the wind load on the top of the wind turbine concrete tower under rated wind speed conditions, where W basic-e is the basic wind load on the tower top area under basic wind pressure, W turb is the wind load due to turbulence, W shear Wind load due to wind shear effect, W top is the airflow wind load, k1 is the basic wind load coefficient, k2 is the turbulence influence coefficient, k3 is the wind shear coefficient, and k4 is the airflow influence coefficient;

[0053] The W basic-eis the rated basic wind load Where ρ is the air density, A is the windward area, C D is the drag coefficient, V top is the wind speed at the top of the tower;

[0054] The turbulent wind load W turb =k turb ·W basic , where k turb is the turbulence influence coefficient;

[0055] The wind shear load Among them C shear is the wind shear coefficient, V ref is the wind speed at the reference height, V is the wind speed at the tower top height;

[0056] The air flow wind load k top is the airflow coefficient in the tower top area, A top is the wind-exposed area of ​​the tower top;

[0057] The calculation model of wind load on the top of wind turbine concrete tower under cut-out wind speed condition is W c =k1·W basic-c +k2·W turb +k3·W shear-c +k4·W top +k5W cut ;

[0058] Said

[0059] Said

[0060] The W cut =W basic-c Aβ z μ z k cut-out , where β z is the tangential wind vibration coefficient, μ z is the coefficient of variation of wind pressure height;

[0061] The β z =k turb G JZ Z , g is the tangential peak factor, R is the wind vibration factor, B Z is the wind vibration coefficient at height Z;

[0062] The calculation model of wind load on the top of wind turbine concrete tower under extreme wind speed condition is W j =k1·W basic-j +k2·W turb +k3·W shear-j+k4·W top-j , the W j is the total wind load on the top of the tower under extreme wind speed conditions;

[0063] Said

[0064] Said

[0065] Said Where V ext The extreme wind speed.

[0066] The calculation model of wind load on the top of wind turbine concrete tower under startup and shutdown conditions includes the calculation model of wind load on the top of wind turbine concrete tower under startup and shutdown conditions W start Calculation model of wind load on top of wind turbine concrete tower under shutdown conditions W stop ; said W start =W basic-e ×(1+α start ), where α start is the aerodynamic damping coefficient under starting conditions;

[0067] The W stop =W basic-e ×β stop , where β stop is the aerodynamic damping coefficient under shutdown conditions.

[0068] S4: Construct a load combination calculation model under different wind speed and load conditions. By judging the wind speed condition of the wind load calculation model at the top of the wind turbine concrete tower, combine the wind speed condition model of the wind load at the top of the wind turbine concrete tower with the comprehensive wind load force of the wind turbine concrete tower, and then construct a mechanical analysis model of the wind turbine concrete tower.

[0069] The mechanical analysis method uses the steps of the above-mentioned calculation model to perform mechanical analysis simulation, simulates the stress, strain and displacement of the tower under different wind speeds and load conditions, can comprehensively evaluate the performance of the tower, and guide the design optimization to improve its performance under extreme conditions. At the same time, the tower structure can be optimized through the above-mentioned model parameters, including increasing the wall thickness, adjusting the steel bar layout or using high-performance materials. The optimized design can be verified again through the above-mentioned mechanical analysis method to ensure that all design requirements are met.

[0070] Example 2

[0071] This embodiment is mainly based on Embodiment 1, and mainly introduces how to determine the tower top wind load calculation model for building a wind power concrete tower, including the tower top wind load calculation model of the wind power concrete tower under rated wind speed conditions, the tower top wind load calculation model of the wind power concrete tower under cut-out wind speed conditions, the tower top wind load calculation model of the wind power concrete tower under extreme wind speed conditions, and the tower top wind load calculation model of the wind power concrete tower under startup and shutdown conditions.

[0072] The real-time wind speed data, average wind speed, maximum wind speed, and turbulence intensity of the wind turbine concrete tower site are collected, and statistical analysis is performed on the collected wind speed data to determine the frequency distribution of wind speed, using the Weibull distribution statistical distribution model.

[0073] The maximum wind speed at which wind power concrete can operate continuously is determined by the Weibull distribution statistical distribution model, and the wind speed is determined to be the rated wind speed condition, and the calculation model of the wind load on the top of the wind power concrete tower under the rated wind speed condition is built as W E =k1·W basic-e +k2·W turb +k3·W shear +k4·W top , W E ;

[0074] The Weibull distribution statistical distribution model is used to determine the wind speed at which the wind turbine of the wind power concrete unit starts to reduce power output or completely cut out of the grid, and the wind speed is higher than the rated wind speed. This wind speed is determined as the cut-out wind speed condition, and the calculation model of the wind load on the top of the wind power concrete tower under the cut-out wind speed condition is W c =k1·W basic-c +k2·W turb +k3·W shear-c +k4·W top +k5W cut ;

[0075] The Weibull distribution statistical distribution model is used to determine that the wind speed is much greater than the wind speed under the cut-out wind speed condition, and it is determined to be an extreme wind speed condition. A calculation model W for the top wind load of the wind turbine concrete tower under the extreme wind speed condition is then built. j =k1·W basic-j +k2·W turb +k3·W shear-j +k4·W top-j At the same time, under the extreme wind speed conditions, the wind turbine and the concrete tower take into account the maximum wind speed. The calculation formula for the comprehensive wind load force of the tower is: V z (t) then select the extreme wind speed;

[0076] The starting wind speed is the minimum wind speed at which the wind turbine starts to operate. The calculation model W of the wind load on the top of the wind turbine concrete tower under the starting condition is constructed. start =W basic-e ×(1+α start );

[0077] The shutdown wind speed is lower than the startup wind speed, and the calculation model W of the wind load on the top of the wind turbine concrete tower under shutdown conditions is built. stop =W basic-e ×β stop .

[0078] This embodiment comprehensively considers the mechanical analysis method of wind loads on the top of a wind turbine concrete tower under dynamic changes. Through the mechanical analysis method of the tower top, the mechanical analysis method model of the wind turbine concrete tower top is combined with the mechanical analysis method model of the wind turbine concrete tower body to perform real-time and comprehensive mechanical analysis of the wind turbine concrete tower, thereby improving the accuracy of the mechanical analysis.

[0079] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. The mechanical analysis method of wind power concrete tower under different wind speed and load conditions includes the following steps: S1: Construct a schematic force diagram of the wind power concrete tower and conduct mechanical force analysis on the tower through three-dimensional coordinate axes; S2: Build a wind load calculation model for the wind turbine concrete tower body, and use the wind load calculation model for the wind turbine concrete tower body to perform mechanical analysis and simulation on the wind turbine concrete tower body under different wind speeds and load conditions; S3: Construct the wind load model of the top of the wind turbine concrete tower under different working conditions, determine the working condition model required for the top of the tower, and use the wind load calculation model of the top of the wind turbine concrete tower to perform mechanical analysis and simulation on the top of the wind turbine concrete tower under different wind speeds and load conditions; S4: Construct a load combination calculation model under different wind speeds and load conditions, and use the load combination calculation model to construct a mechanical analysis model of the wind power concrete tower; The tower top wind load calculation model of the wind power concrete tower constructed in S3 includes the tower top wind load calculation model of the wind power concrete tower under rated wind speed conditions, the tower top wind load calculation model of the wind power concrete tower under cut-out wind speed conditions, the tower top wind load calculation model of the wind power concrete tower under extreme wind speed conditions, and the tower top wind load calculation model of the wind power concrete tower under startup and shutdown conditions; The calculation model of wind load on the top of wind turbine concrete tower under rated wind speed condition is W E =k1·W basic-e +k2·W turb +k3·W shear +k4·W top , W E is the wind load on the top of the wind turbine concrete tower under rated wind speed conditions, where W basic-e is the basic wind load on the tower top area under basic wind pressure, W turb is the wind load due to turbulence, W shear Wind load due to wind shear effect, W top is the airflow wind load, k1 is the basic wind load coefficient, k2 is the turbulence influence coefficient, k3 is the wind shear coefficient, and k4 is the airflow influence coefficient; The W basic-e is the rated basic wind load Where ρ is the air density, A is the windward area, C D is the drag coefficient, V top is the wind speed at the top of the tower; The turbulent wind load W turb =k turb ·W basic , where k turb is the turbulence influence coefficient; The wind shear load Among them C shear is the wind shear coefficient, V ref is the wind speed at the reference height, V is the wind speed at the tower top height; The air flow wind load k top is the airflow coefficient in the tower top area, A top is the wind-exposed area of ​​the tower top; The calculation model of wind load on the top of the wind turbine concrete tower under the cut-out wind speed condition is W c =k1·W basic-c +k2·W turb +k3·W shear-c +k4·W top +k5W cut ; Said Said The W cut =W basic-c Aβ z μ z k cut-out , where β z is the tangential wind vibration coefficient, μ z is the coefficient of variation of wind pressure height; The β z =k turbg RB Z , g is the tangential peak factor, R is the wind vibration factor, B Z is the wind vibration coefficient at height Z; The calculation model of wind load on the top of wind turbine concrete tower under extreme wind speed condition is W j =k1·W basic-j +k2·W turb +k3·W shear-j +k4·W top-j , the W j is the total wind load on the top of the tower under extreme wind speed conditions; Said Said Said Where V ext is the extreme wind speed; The tower top wind load calculation model of the wind power concrete tower under the startup and shutdown conditions includes the tower top wind load calculation model W of the wind power concrete tower under the startup condition. start Calculation model of wind load on top of wind turbine concrete tower under shutdown conditions W stop ; The W start =W basic-e ×(1+α start ), where α start is the aerodynamic damping coefficient under starting conditions; The W stop =W basic-e ×β stop , where β stop is the aerodynamic damping coefficient under shutdown conditions.

2. The mechanical analysis method of wind power concrete tower under different wind speed and load conditions according to claim 1 is characterized in that: The S1 sets a coordinate system in three-dimensional space, with the center of the tower bottom as the origin, the tower axis along the Z axis as the positive direction, and the windward side perpendicularly establishes the positive direction of the X axis, to analyze the distribution and action points of the wind power concrete tower in three-dimensional space under different wind speeds and load conditions.

3. The mechanical analysis method of wind power concrete tower under different wind speed and load conditions according to claim 1 is characterized in that: The comprehensive wind load force of the S2 wind power concrete tower is nonlinearly distributed along the tower body, and the calculation formula for the comprehensive wind load force of the tower body is constructed: W wind,total (t) represents the comprehensive wind load, q z,nl (z) represents the wind load at height z, A(z) represents the cross-sectional area of ​​the tower at height z, and R(z,t) represents the response function of the tower at height z and time t; z,nl The calculation formula of (z) is: Where, ∈ is the nonlinear distribution coefficient, H is the total height of the tower, q z (t) is the dynamic wind load; z (t) is calculated as: V z (t) is the wind speed that varies with time, C z (t) is the wind load shape coefficient considering time variation, and ρ represents the air density.

4. The mechanical analysis method of wind power concrete tower under different wind speed and load conditions according to claim 3 is characterized in that: The formula for the tower response function R(z,t) at height z and time t is: R(z,t)=w1·R dis (z,t)+w2·R stress (z,t)+w3·R freq (z,t),R dis (z,t) represents the maximum displacement caused by wind load, R stress (z, t) represents the displacement caused by the stress of the tower, R freq (z, t) represents the displacement caused by tower vibration, w1, w2, w3 are weight coefficients; δ(z,τ) represents the tower displacement at height z and change time τ; stress (z,t)=σ max (z,t)-σ min (z,t),σ max (z,t) and σ min (z, t) are the maximum principal stress and the minimum principal stress at height z and time t, respectively; σ(z,ω) is the stress vibration at height z and frequency ω.

5. The mechanical analysis method of wind power concrete tower under different wind speed and load conditions according to claim 1 is characterized in that: In the S4, a load combination calculation model under different wind speed and load conditions is constructed. By judging the wind speed condition of the tower top wind load calculation model of the wind power concrete tower, the tower top wind load wind speed condition model of the wind power concrete tower is combined with the comprehensive wind load force of the wind power concrete tower, and then a mechanical analysis model of the wind power concrete tower is constructed.

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