Method and device for checking vorticity-induced vibration of blade

Abstract

The present invention relates to the technical field of wind turbine units, and in particular, to a method and a device for checking the vortex-induced vibration of blades. The method for checking the vortex-induced vibration of blades includes: obtaining the transverse vibration load during blade hoisting; calculating the total load borne by the blade during hoisting; calculating the remaining service life of the blade according to the total load; determining whether the remaining service life of the blade is lower than the expected service life; if not, determining that the blade meets the hoisting requirements; if so, determining that the blade does not meet the hoisting requirements. The device for checking the vortex-induced vibration of blades can execute the above-mentioned checking method. The method and the device for checking the vortex-induced vibration of blades provided by the present invention can, before blade hoisting, realize the judgment of the influence degree of vortex-induced vibration on the blade, complete the simulation check of the remaining service life of the blade after hoisting, and thus, before blade hoisting, pre-treat the blades that cannot reach the expected service life, and can reduce the maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and in particular, to a method and a device for checking the vortex-induced vibration of blades. Background Art

[0002] A wind turbine is a device that uses natural wind to drive the rotation of blades to generate electricity and realizes the conversion of wind energy into electrical energy. With the continuous understanding of the wind resource characteristics in low-wind-speed regions by the wind power industry and the rapid development of wind resource assessment technology, the potential for the development and utilization of wind resources across the country has been continuously upgraded. Long blades and large wind wheels are an inevitable choice for the development of large-scale wind turbines.

[0003] In the existing wind turbines in the hoisting state, when air flows through the blades, vortices often appear at the rear side of the blades, and vortex-induced vibration may occur. Once vortex-induced vibration occurs, it will cause certain damage to the blades. When the vortex-induced vibration is relatively serious, it will seriously affect the service life of the blades, resulting in the blades being unable to reach the expected service life and increasing the maintenance cost.

[0004] In summary, how to overcome the above defects of the blades of the existing wind turbines is a technical problem that those skilled in the art need to solve urgently. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and a device for checking the vortex-induced vibration of blades to alleviate the technical problem of the relatively high blade maintenance cost in the existing wind turbines.

[0006] The method for checking the vortex-induced vibration of the blades provided by the present invention includes:

[0007] Obtaining the transverse vibration load during blade hoisting;

[0008] Calculating the total load borne by the blade during hoisting;

[0009] Calculating the remaining service life of the blade according to the total load;

[0010] Judging whether the remaining service life of the blade is lower than the expected service life;

[0011] If not, it is determined that the blade meets the hoisting requirements; if so, it is determined that the blade does not meet the hoisting requirements.

[0012] Preferably, as an implementable manner, the checking method further includes:

[0013] Judging whether it is necessary to perform a transverse vibration analysis on the blade;

[0014] If so, execute the step of obtaining the transverse vibration load during blade hoisting; if not, execute the step of determining that the blade meets the hoisting requirements.

[0015] Preferably, as an implementable manner, the step of determining whether transverse vibration analysis of the blade is required includes:

[0016] Obtain the wind speed of the hoisting environment and determine the critical wind speed;

[0017] Judge whether the ratio of the critical wind speed to the wind speed of the hoisting environment is less than or equal to a preset threshold;

[0018] If not, transverse vibration analysis of the blade is not required; if so, transverse vibration analysis of the blade is required.

[0019] Preferably, as an implementable manner, the checking method further includes:

[0020] Judge whether vortex-induced vibration may occur during blade hoisting;

[0021] If so, execute the step of determining whether transverse vibration analysis of the blade is required; if not, execute the step of determining that the blade meets the hoisting requirements.

[0022] Preferably, as an implementable manner, the step of judging whether vortex-induced vibration may occur during blade hoisting includes:

[0023] Obtain the wind speed of the hoisting environment and determine the windward area during blade hoisting;

[0024] Calculate the vortex shedding frequency of the blade according to the wind speed of the hoisting environment and the windward area;

[0025] Judge whether the ratio of the vortex shedding frequency to the frequency or multiple frequency of the closest blade is within a preset range;

[0026] If so, determine that vortex-induced vibration may occur during blade hoisting; if not, determine that vortex-induced vibration will not occur during blade hoisting.

[0027] Preferably, as an implementable manner, after the step of determining that the blade does not meet the hoisting requirements, the checking method further includes: installing a vortex-induced vibration suppressor on the blade.

[0028] Preferably, as an implementable manner, the step of obtaining the transverse vibration load during blade hoisting includes:

[0029] Obtain the Reynolds number during blade hoisting;

[0030] Calculate the transverse vibration load during blade hoisting according to the Reynolds number.

[0031] Preferably, as an implementable manner, the step of calculating the remaining service life of the blade according to the total load includes

[0032] Calculate the stress borne by the blade according to the total load;

[0033] Calculate the fatigue damage of the blade according to the stress;

[0034] Calculate the remaining service life of the blade based on the Miner's rule according to the fatigue damage.

[0035] Correspondingly, the present invention also provides a checking module, which includes:

[0036] An acquisition module for acquiring the transverse vibration load during the hoisting of the blade;

[0037] A calculation module for calculating the total load borne by the blade during hoisting, and calculating the remaining service life of the blade according to the total load;

[0038] A judgment module for judging whether the remaining service life of the blade is higher than the expected service life;

[0039] A determination module for determining that the blade meets the hoisting requirements when the remaining service life of the blade is equal to or higher than the expected service life; and for determining that the blade does not meet the hoisting requirements when the remaining service life of the blade is lower than the expected service life.

[0040] The present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is read and run by a processor, the above-mentioned checking method for blade vortex-induced vibration is realized.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0042] Before the blade is hoisted, the hoisting state of the blade is pre-simulated to obtain the transverse vibration load generated by the blade due to vortex-induced vibration during hoisting. The obtained transverse vibration load is superimposed with other loads of the blade (such as inertial load, gravitational load, aerodynamic load, icing load, etc.) to calculate the actual total load borne by the blade during hoisting. According to the actual total load borne by the blade during hoisting calculated, the remaining service life of the blade is calculated and evaluated to judge whether the remaining service life of the blade is lower than the expected service life. If the remaining service life of the blade is not lower than the expected service life, it indicates that the checked blade will be able to work normally until the expected service life after hoisting. At this time, it can be determined that the checked blade meets the hoisting requirements and can be hoisted normally. If the remaining service life of the blade is lower than the expected service life, it indicates that the checked blade will not be able to work normally until the expected service life after hoisting, that is, the checked blade needs to be repaired or replaced during the period when it should normally work. At this time, it can be determined that the checked blade does not meet the hoisting requirements.

[0043] Therefore, the method for checking the vortex-induced vibration of the blade provided by the present invention can judge the influence degree of the vortex-induced vibration on the blade before the blade is hoisted, complete the simulation check of the remaining service life of the blade after hoisting. Thus, before the blade is hoisted, the blade that cannot reach the expected service life can be pretreated so that the blade can work normally until the expected service life after hoisting, and the maintenance cost can be reduced.

[0044] For the checking device of the vortex-induced vibration of the blade provided by the present invention, the acquisition module, the calculation module, the judgment module and the determination module can execute the above-mentioned checking method, judge the influence degree of the vortex-induced vibration on the blade before the blade is hoisted, and complete the simulation check of the remaining service life of the blade after hoisting. Thus, before the blade is hoisted, the blade that cannot reach the expected service life can be pretreated so that the blade can work normally until the expected service life after hoisting, and the maintenance cost can be reduced.

[0045] The computer-readable storage medium provided by the present invention can run the above-mentioned checking method, judge the influence degree of the vortex-induced vibration on the blade before the blade is hoisted, and complete the simulation check of the remaining service life of the blade after hoisting. Thus, before the blade is hoisted, the blade that cannot reach the expected service life can be pretreated so that the blade can work normally until the expected service life after hoisting, and the maintenance cost can be reduced. Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0047] Figure 1 It is the first flow chart of the method for checking the vortex-induced vibration of the blade provided by the embodiment of the present invention;

[0048] Figure 2 It is the second flow chart of the method for checking the vortex-induced vibration of the blade provided by the embodiment of the present invention;

[0049] Figure 3 It is the structural schematic diagram of the checking device of the vortex-induced vibration of the blade provided by the embodiment of the present invention.

[0050] Description of the Reference Numerals:

[0051] 10 - Acquisition module; 20 - Calculation module; 30 - Judgment module; 40 - Determination module. Detailed Embodiments

[0052] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0053] The present invention will be further described in detail below through specific examples in conjunction with the accompanying drawings.

[0054] See Figure 1 , this embodiment provides a method for checking the vortex-induced vibration of blades, which includes:

[0055] S102, obtaining the transverse vibration load during blade hoisting.

[0056] Before blade hoisting, the blade hoisting state is pre-simulated to obtain the transverse vibration load generated by vortex-induced vibration during blade hoisting.

[0057] S104, calculating the total load borne by the blade during hoisting.

[0058] The obtained transverse vibration load is superimposed with other loads of the blade (such as: inertial load, gravitational load, aerodynamic load, icing load, etc.) to calculate the actual total load borne by the blade during hoisting.

[0059] S106, calculating the remaining service life of the blade according to the total load.

[0060] S108, judging whether the remaining service life of the blade is lower than the expected service life.

[0061] S110, if not, it is determined that the blade meets the hoisting requirements.

[0062] If the remaining service life of the blade is not lower than the expected service life, it means that the checked blade will be able to work normally until the expected service life after hoisting. At this time, it can be determined that the checked blade meets the hoisting requirements and can be hoisted normally.

[0063] S112, if so, it is determined that the blade does not meet the hoisting requirements.

[0064] If the remaining service life of the blade is lower than the expected service life, it means that the checked blade will not be able to work normally until the expected service life after hoisting, that is, the checked blade needs to be repaired or replaced during the period when it should normally work. At this time, it can be determined that the checked blade does not meet the hoisting requirements, and pre-treatment (such as installing a spoiler device) can be carried out on it so that the blade can work normally until the expected service life after hoisting, which can reduce the maintenance cost.

[0065] In the verification method provided in this embodiment, step S114 may further be added: determine whether it is necessary to perform transverse vibration analysis on the blade. If the determination result is yes, it means that the influence of vortex-induced vibration on the blade is relatively large. In this case, it is necessary to execute the above step S102 to specifically analyze the influence degree of the transverse vibration load generated by vortex-induced vibration on the blade, so as to determine whether the blade still meets the hoisting requirements under the influence of vortex-induced vibration; correspondingly, if the determination result is no, it means that vortex-induced vibration has almost no influence on the blade. In this case, it is not necessary to specifically analyze the influence degree of the transverse vibration load generated by vortex-induced vibration, and the above step S110 can be executed to directly determine that the blade meets the hoisting requirements.

[0066] It should be noted that adding the judgment step of whether it is necessary to perform transverse vibration analysis on the blade can omit the steps of transverse vibration analysis on the blade (S102, S104, S106) when the blade meets the hoisting requirements, which is convenient for improving the verification efficiency of the blade.

[0067] The above step S114 may specifically include:

[0068] S1142, obtain the wind speed of the hoisting environment and determine the critical wind speed (i.e., the minimum wind speed that can cause vortex-induced vibration of the blade).

[0069] The wind speed of the hoisting environment can be collected by a wind speed collection device and input into the corresponding acquisition module.

[0070] S1144, judge whether the ratio of the critical wind speed to the wind speed of the hoisting environment is less than or equal to a preset threshold.

[0071] S1146, if not, it is not necessary to perform transverse vibration analysis on the blade.

[0072] When the wind speed of the hoisting environment is too small, resulting in the ratio of the critical wind speed to the wind speed of the hoisting environment being greater than the preset threshold, it means that the natural wind in the hoisting environment flows past the blade, generating very small vortex-induced vibration, that is, vortex-induced vibration has almost no influence on the blade. In this case, it can be determined that it is not necessary to perform transverse vibration analysis on the blade.

[0073] S1148, if so, it is necessary to perform transverse vibration analysis on the blade.

[0074] When the wind speed of the hoisting environment is relatively large, resulting in the ratio of the critical wind speed to the wind speed of the hoisting environment being less than or equal to the preset threshold, it means that the natural wind in the hoisting environment flows past the blade, generating relatively large vortex-induced vibration, that is, the influence of vortex-induced vibration on the blade is relatively serious. In this case, it can be determined that it is necessary to perform transverse vibration analysis on the blade.

[0075] Specifically, the above preset threshold can be set to 1.25.

[0076] In the checking method provided in this embodiment, step S116 may further be added: determine whether vortex-induced vibration may occur during blade hoisting. If the judgment result is yes, then execute the above-mentioned step S114 to specifically analyze the influence degree of vortex-induced vibration on the blade, so as to judge whether the blade still meets the hoisting requirements under the influence of vortex-induced vibration; if the judgment result is no, it means that vortex-induced vibration will not occur during blade hoisting, and naturally there is no need to analyze the influence degree of vortex-induced vibration on the blade, and the above-mentioned step S110 can be executed to directly determine that the blade meets the hoisting requirements.

[0077] The above-mentioned step S116 may specifically include:

[0078] S1161, obtain the wind speed of the hoisting environment and determine the windward area when the blade is hoisted.

[0079] The wind speed of the hoisting environment can be collected by a wind speed collection device and input into the corresponding acquisition module.

[0080] S1162, calculate the vortex shedding frequency of the blade according to the wind speed of the hoisting environment and the windward area of the blade.

[0081] S1163, judge whether the ratio of the calculated vortex shedding frequency of the blade to the closest frequency or multiple frequency of the blade is within a preset range.

[0082] First judge which frequency value in the frequency or multiple frequency of the blade is closest to the vortex shedding frequency of the blade calculated in the above-mentioned step S1162, then calculate the ratio of the vortex shedding frequency of the blade to this frequency value, and judge whether this ratio is within the preset range, that is, judge whether the vortex shedding frequency of the blade is close to the frequency or multiple frequency of the blade.

[0083] S1164, if so, determine that vortex-induced vibration may occur during blade hoisting.

[0084] When the vortex shedding frequency of the blade is close to the frequency or multiple frequency of the blade, the blade may be prone to vortex-induced vibration.

[0085] S1165, if not, determine that vortex-induced vibration will not occur during blade hoisting.

[0086] When the vortex shedding frequency of the blade is quite different from the frequency and any multiple frequency of the blade, the blade will not be prone to vortex-induced vibration.

[0087] Specifically, the above-mentioned preset range may be selected as 95% - 105%.

[0088] In addition, after the step of determining that the blade does not meet the hoisting requirements, a step S118 can be additionally provided: installing a vortex-induced vibration suppressor on the blade, so as to reduce the vortex-induced vibration generated on the blade by using the vortex-induced vibration suppressor, and further reduce the damage to the blade caused by the vortex-induced vibration, extend the service life of the blade, enable the blade to reach the expected service life as much as possible, and reduce the maintenance cost.

[0089] The above-mentioned step S102 may specifically include: obtaining the Reynolds number during blade hoisting, and calculating the transverse vibration load during blade hoisting according to the obtained Reynolds number.

[0090] The above-mentioned step S106 may specifically include:

[0091] S1062, calculating the stress borne by the blade according to the calculated total load;

[0092] S1064, calculating the fatigue damage of the blade according to the calculated stress borne by the blade;

[0093] S1066, calculating the remaining service life of the blade based on the Miner's rule according to the calculated fatigue damage of the blade.

[0094] See Figure 2 , in order to further illustrate the present invention more specifically, a specific example is listed as follows:

[0095] S202, judging whether vortex-induced vibration may occur during blade hoisting;

[0096] S204, if so, judging whether the ratio of the critical wind speed to the wind speed of the hoisting environment is less than or equal to 1.25;

[0097] S206, if so, performing a transverse vibration analysis on the blade;

[0098] S208, obtaining the transverse vibration load during blade hoisting;

[0099] S210, calculating the total load borne by the blade during hoisting;

[0100] S212, calculating the stress borne by the blade;

[0101] S214, calculating the fatigue damage of the blade;

[0102] S216, calculating the remaining service life of the blade based on the Miner's rule;

[0103] S218, judging whether the remaining service life of the blade is lower than the expected service life;

[0104] S220, if so, installing a vortex-induced vibration suppressor on the blade;

[0105] S222. If not, it is determined that the blade meets the hoisting requirements.

[0106] See Figure 3 , this embodiment also provides a device for checking the vortex-induced vibration of a blade, which includes: an acquisition module 10, a calculation module 20, a judgment module 30, and a determination module 40. The acquisition module 10 can acquire the transverse vibration load during the hoisting of the blade; the calculation module 20 can calculate the total load borne by the blade during hoisting and calculate the remaining service life of the blade based on the total load; the judgment module 30 can judge whether the remaining service life of the blade is higher than the expected service life; the determination module 40 can determine that the blade meets the hoisting requirements when the remaining service life of the blade is equal to or higher than the expected service life, and can determine that the blade does not meet the hoisting requirements when the remaining service life of the blade is lower than the expected service life.

[0107] For the device for checking the vortex-induced vibration of the blade provided in this embodiment, the acquisition module 10, the calculation module 20, the judgment module 30, and the determination module 40 can execute the above-mentioned checking method. Before the blade is hoisted, it can realize the judgment of the influence degree of vortex-induced vibration on the blade and complete the simulation check of the remaining service life of the blade after hoisting. Thus, before the blade is hoisted, the blades that cannot reach the expected service life can be pre-treated so that the blades can work normally until the expected service life after hoisting, and the maintenance cost can be reduced.

[0108] This embodiment also provides a computer-readable storage medium, which stores a computer program. When the computer program is read and run by a processor, it realizes the above-mentioned method for checking the vortex-induced vibration of the blade.

[0109] The computer-readable storage medium provided in this embodiment can run the above-mentioned checking method. Before the blade is hoisted, it can realize the judgment of the influence degree of vortex-induced vibration on the blade and complete the simulation check of the remaining service life of the blade after hoisting. Thus, before the blade is hoisted, the blades that cannot reach the expected service life can be pre-treated so that the blades can work normally until the expected service life after hoisting, and the maintenance cost can be reduced.

[0110] In summary, the embodiments of the present invention disclose a method, a device, and a computer-readable storage medium for checking the vortex-induced vibration of a blade, which overcome the technical defect of the high maintenance cost of the blades of traditional wind turbines. The method, the device, and the computer-readable storage medium for checking the vortex-induced vibration of the blade provided in the embodiments of the present invention can realize the judgment of the influence degree of vortex-induced vibration on the blade before the blade is hoisted and complete the simulation check of the remaining service life of the blade after hoisting. Thus, before the blade is hoisted, the blades that cannot reach the expected service life can be pre-treated so that the blades can work normally until the expected service life after hoisting, and the maintenance cost can be reduced.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for checking the vortex-induced vibration of a blade, characterized in that, the checking method includes: Obtaining the transverse vibration load during blade hoisting; Calculating the total load borne by the blade during hoisting; Calculating the remaining service life of the blade according to the total load; Judging whether the remaining service life of the blade is lower than the expected service life; If not, it is determined that the blade meets the hoisting requirements; if so, it is determined that the blade does not meet the hoisting requirements; The checking method further includes: Judging whether it is necessary to perform a transverse vibration analysis on the blade; if so, performing the step of obtaining the transverse vibration load during blade hoisting; if not, performing the step of determining that the blade meets the hoisting requirements; The step of judging whether it is necessary to perform a transverse vibration analysis on the blade includes: Obtaining the wind speed of the hoisting environment and determining the critical wind speed; Judging whether the ratio of the critical wind speed to the wind speed of the hoisting environment is less than or equal to a preset threshold; if not, it is not necessary to perform a transverse vibration analysis on the blade; if so, it is necessary to perform a transverse vibration analysis on the blade; The checking method further includes: Judging whether vortex-induced vibration may occur during blade hoisting; If so, performing the step of judging whether it is necessary to perform a transverse vibration analysis on the blade; if not, performing the step of determining that the blade meets the hoisting requirements; The step of judging whether vortex-induced vibration may occur during blade hoisting includes: Obtaining the wind speed of the hoisting environment and determining the windward area during blade hoisting; Calculating the vortex shedding frequency of the blade according to the wind speed of the hoisting environment and the windward area; Judging whether the ratio of the vortex shedding frequency to the frequency or multiple frequency of the closest blade is within a preset range; If so, it is determined that vortex-induced vibration may occur during blade hoisting; if not, it is determined that vortex-induced vibration will not occur during blade hoisting.

2. The checking method according to claim 1, characterized in that, after the step of determining that the blade does not meet the hoisting requirements, the checking method further includes: Installing a vortex-induced vibration suppressor on the blade.

3. The checking method according to claim 1, characterized in that, the step of obtaining the transverse vibration load during blade hoisting includes: Obtaining the Reynolds number during blade hoisting; Calculating the transverse vibration load during blade hoisting according to the Reynolds number.

4. The checking method according to claim 1, characterized in that, the step of calculating the remaining service life of the blade according to the total load includes Calculating the stress borne by the blade according to the total load; Calculating the fatigue damage of the blade according to the stress; Calculating the remaining service life of the blade based on the Miner's rule according to the fatigue damage.

5. A computer-readable storage medium, characterized in that, the computer-readable storage medium stores a computer program, and when the computer program is read and run by a processor, it implements the method for checking the vortex-induced vibration of a blade according to any one of claims 1-4.

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