CN106547963B - A method and device for checking the ultimate strength of a fan yaw brake disc - Google Patents
A method and device for checking the ultimate strength of a fan yaw brake disc Download PDFInfo
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- CN106547963B CN106547963B CN201610919339.0A CN201610919339A CN106547963B CN 106547963 B CN106547963 B CN 106547963B CN 201610919339 A CN201610919339 A CN 201610919339A CN 106547963 B CN106547963 B CN 106547963B
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Abstract
本发明涉及一种风机偏航制动盘极限强度的校核方法及装置，属于风力发电技术领域。本发明首先建立包含风机偏航制动载荷传递路径的几何模型，然后将该模型导入至有限元分析软件进行网格划分，设置连接结构载荷和边界条件，通过在塔顶法兰中心位置建立节点，将节点与主机架前端法兰通过刚性梁单元连接起来，在塔顶法兰中心位置施加极限工况载荷，通过刚性梁单元将载荷传递至主机架，经过偏航制动钳传递至偏航制动盘，以实现对偏航制动盘受力关系的准确模拟。通过上述方法，本发明得到的偏航制动盘的应力大小和危险位置准确度更高，符合偏航制动盘实际受力关系，能够实现风机偏航制动盘极限强度的准确校核。
The invention relates to a method and a device for checking the ultimate strength of a yaw brake disc of a fan, belonging to the technical field of wind power generation. The present invention first establishes a geometric model including the transmission path of the yaw braking load of the fan, then imports the model into finite element analysis software for mesh division, sets the connection structure load and boundary conditions, and establishes a node at the center of the tower top flange by establishing a node , connect the node and the front-end flange of the main frame through a rigid beam unit, apply the ultimate load at the center of the tower top flange, transfer the load to the main frame through the rigid beam unit, and transfer the load to the yaw through the yaw brake caliper Brake disc to achieve accurate simulation of the force relationship of the yaw brake disc. Through the above method, the yaw brake disc obtained by the present invention has higher stress magnitude and danger position accuracy, conforms to the actual force relationship of the yaw brake disc, and can accurately check the ultimate strength of the fan yaw brake disc.
Description
Technical Field
The invention relates to a method and a device for checking ultimate strength of a fan yaw brake disc, and belongs to the technical field of wind power generation.
Background
At present, a yaw brake disc of a large wind generating set is mainly calculated by adopting a finite element method, and a common node or binding method is mainly adopted in the boundary processing of a main frame and the yaw brake disc, so that only the load transmitted by the main frame through a yaw brake caliper is considered, the load transmitted by the main frame through a yaw driving motor is simplified, and the final calculation result of the yaw brake disc is larger. Meanwhile, because an integral joint-sharing method is generally adopted when a yaw bearing is simulated, the nonlinear relation that the bearing only bears pressure and does not bear pulling force when the bearing transmits force cannot be embodied, and the ultimate strength of the obtained yaw brake disc is also inaccurate.
Disclosure of Invention
The invention aims to provide a method and a device for checking the ultimate strength of a fan yaw brake disc, and aims to solve the problem that the ultimate strength of the fan yaw brake disc obtained by adopting a common node or binding method is not accurate enough at present.
The invention provides a method for checking the ultimate strength of a yaw brake disc of a fan to solve the technical problems, which comprises the following steps:
1) establishing a geometric model containing a fan yaw brake load transfer path, wherein the geometric model at least comprises a main frame, a yaw driving motor, a yaw bearing, a yaw brake caliper, a yaw brake disc, a tower top flange and a tower;
2) importing the geometric model into finite element analysis software for mesh division;
3) establishing a node at the center of a tower top flange, and connecting the node and a main frame front end flange through a rigid beam unit to simulate the main frame to transfer load, wherein the engagement of a yaw bearing ball and a gear between a yaw bearing and a yaw driving device is simulated by a rod unit only bearing pressure; the main frame, the yaw driving motor, the yaw bearing, the yaw brake caliper, the yaw brake disc and the joint surface between the tower top flanges are connected in a binding contact mode;
4) and applying loads of all limit working conditions at the center position of the tower top flange, carrying out nonlinear solution on the finite element model under all the limit working conditions, checking the stress magnitude and the dangerous position of the yaw brake disc, and comparing the value with the allowable stress value of the part to check the limit strength of the yaw brake disc.
Further, when the step 4) applies the limit working condition load to the center position of the tower top flange, the load is transmitted to the main frame through the rigid beam unit and is transmitted to the yaw brake disc through the yaw brake caliper, so that the stress condition of the yaw brake disc is simulated.
Further, in the step 2), when grid division is performed, the yaw driving gear is simulated by adopting a pipe unit and a beam unit, and the yaw driving gear and the yaw driving motor are connected through a rigid beam unit; the main frame, the yaw driving motor and the yaw brake disc adopt tetrahedral units to divide grids; and the yaw bearing, the yaw brake caliper, the tower top flange and the tower cylinder adopt hexahedral units to divide grids.
Furthermore, the size of the adopted grids of the tetrahedral unit and the hexahedral unit is 30-100 mm.
Furthermore, the number of the divided parts of the pipe unit and the beam unit is 10-20.
The invention also provides a checking device for the ultimate strength of the fan yaw brake disc, which comprises a geometric model establishing module, a grid dividing module, a load and boundary condition setting module and a calculation checking module;
the geometric model establishing module is used for establishing a geometric model containing a fan yaw brake load transfer path, and the geometric model at least comprises a main frame, a yaw driving motor, a yaw bearing, a yaw brake caliper, a yaw brake disc, a tower top flange and a tower;
the meshing module is used for importing the geometric model into finite element analysis software for meshing;
the load and boundary condition setting module is used for establishing a node at the center of a tower top flange, and connecting the node with a flange at the front end of a main frame through a rigid beam unit so as to simulate the main frame to transfer load, wherein the engagement of a yaw bearing ball and a gear between a yaw bearing and a yaw driving device is simulated by a rod unit only bearing pressure; the main frame, the yaw driving motor, the yaw bearing, the yaw brake caliper, the yaw brake disc and the joint surface between the tower top flanges are connected in a binding contact mode;
and the calculation and check module is used for applying loads of all limit working conditions to the center position of the tower top flange, carrying out nonlinear solution on the finite element model under all limit working conditions, checking the stress magnitude and the dangerous position of the yaw brake disc, and comparing the value with the allowable stress value of the part to check the limit strength of the yaw brake disc.
Further, when the calculation and check module applies the limit working condition load at the center position of the tower top flange, the load is transmitted to the main frame through the rigid beam unit and is transmitted to the yaw brake disc through the yaw brake caliper so as to simulate the stress condition of the yaw brake disc.
Furthermore, when the grid division module carries out grid division, the yaw driving gear adopts a pipe unit and a beam unit for simulation, and the yaw driving gear is connected with the yaw driving motor through a rigid beam unit; the main frame, the yaw driving motor and the yaw brake disc adopt tetrahedral units to divide grids; and the yaw bearing, the yaw brake caliper, the tower top flange and the tower cylinder adopt hexahedral units to divide grids.
Furthermore, the size of the adopted grids of the tetrahedral unit and the hexahedral unit is 30-100 mm.
Furthermore, the number of the divided parts of the pipe unit and the beam unit is 10-20.
The invention has the beneficial effects that: the method comprises the steps of firstly establishing a geometric model containing a fan yaw braking load transfer path, then guiding the model into finite element analysis software for grid division, setting connecting structure loads and boundary conditions, establishing a node at the center of a tower top flange, connecting the node with a main frame front end flange through a rigid beam unit, applying limit working condition loads at the center of the tower top flange, transferring the loads to the main frame through the rigid beam unit, and transferring the loads to a yaw brake disc through a yaw brake caliper so as to realize accurate simulation of the stress relationship of the yaw brake disc, and embody the nonlinear force transfer relationship between a yaw bearing and a yaw driving gear and a yaw bearing outer gear ring. By the method, the stress magnitude and the dangerous position accuracy of the obtained yaw brake disc are higher, the actual stress relation of the yaw brake disc is met, and the ultimate strength of the fan yaw brake disc can be accurately checked.
Drawings
FIG. 1 is a schematic cross-sectional view of a finite element model of an arrangement of the present invention;
FIG. 2 is a schematic view of a yaw drive connection;
in the figure: 1-main frame, 2-yaw brake caliper, 3-yaw bearing inner ring, 4-yaw bearing ball, 5-yaw bearing outer ring, 6-yaw brake, 7-tower 8-tower top flange, 9-rigid beam unit, 10-yaw drive motor, 11-yaw drive shaft and 12-yaw drive gear.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Embodiment of method for checking ultimate strength of yaw brake disc of fan
The checking method adopts ANSYS (finite element analysis software) as an implementation tool, and the method for checking the ultimate strength of the yaw brake disc of the fan is specifically explained in the embodiment, and comprises the following steps:
1. and establishing a geometric model containing a fan yaw brake load transfer path.
In the embodiment, a geometric model including a fan yaw brake load transfer path, a geometric model of a main frame 1, a yaw drive motor 10, a yaw bearing, a yaw brake caliper 2, a yaw bearing inner ring 3, a yaw bearing ball 4, a yaw bearing outer ring 5, a yaw brake disc 6, a tower top flange 8 and a tower 7 is established in three-dimensional software, as shown in fig. 1, a yaw drive device is shown in fig. 2 and comprises a yaw drive motor 10, a yaw drive shaft 11 and a yaw drive gear 12.
2. And importing the model into finite element analysis software for meshing.
Importing the geometric models of the yaw brake disc 6 and the adjacent parts into ANSYS software for grid division, wherein the specific division process is as follows: in the finite element analysis software, a yaw driving gear 12 is simulated by adopting a pipe unit and a beam unit, the yaw driving gear 12 is connected with a yaw driving motor 10 through a rigid beam unit, a main frame 1, the yaw driving motor 10 and a yaw brake disc 6 are meshed by adopting tetrahedral units, and a yaw bearing, a yaw brake caliper 2, a tower top flange 8 and a tower 7 are meshed by adopting hexahedral units. The arrangement condition of each component unit is detailed in table 1; carrying out mesh division on the introduced three-dimensional geometric model by adopting tetrahedral or hexahedral units, and setting the unit mesh size to be 30-100 mm; simulating the yaw driving gear shaft by adopting a pipe unit, wherein the size of the cross section of the yaw driving gear shaft is consistent with that of the gear shaft, and the number of units is 10-20; the connection between the meshing point of the yaw driving gear and the yaw driving shaft 11 is simulated by adopting a three-dimensional beam unit, and the number of beam units is 10-20. The finite element model element set-up is shown in table 1 in detail.
TABLE 1
3. Connecting structure loads and boundary conditions are set.
A node is established in the center of the tower top flange, and the node and a main frame front end flange are connected through a rigid beam unit 9 to simulate the main frame to transfer load. Wherein the joint surfaces of the components are connected through binding contact arrangement; the meshing between the yaw driving gear and the yaw bearing outer gear ring is simulated through a rod unit only bearing pressure; at the same time, the yaw bearing balls were also simulated using rod units that were only under pressure.
4. And (5) carrying out calculation solution on the finite element model and checking the result.
And applying loads of all limit working conditions at the center of the tower top flange, carrying out nonlinear solution on the finite element model under all limit working conditions, and comparing the value with the allowable stress value of the part to check the limit strength of the yaw brake disc.
In this embodiment, a newton-raphson algorithm of ANSYS software is used to perform nonlinear analysis and solution on finite element models under various limit conditions, the finite element model calculation and solution is performed by a nonlinear solution calculation method, and nonlinear factors in calculation are simulated by a rod unit, specifically: the yaw bearing and the non-linear force transfer relationship between the yaw drive motor gear and the yaw bearing are simulated by the rod unit which is only subjected to pressure. And checking the stress magnitude and the dangerous position of the yaw brake disc through a cloud chart after calculation, and comparing the value with the allowable stress value of the part to check the ultimate strength of the yaw brake disc.
Embodiment of checking device for ultimate strength of yaw brake disc of fan
The checking device in the embodiment comprises a geometric model establishing module, a grid dividing module, a load and boundary condition setting module and a calculation checking module; the geometric model establishing module is used for establishing a geometric model containing a fan yaw brake load transfer path, and the geometric model at least comprises a main frame, a yaw driving motor, a yaw bearing, a yaw brake caliper, a yaw brake disc, a tower top flange and a tower; the meshing module is used for importing the geometric model into finite element analysis software for meshing; the load and boundary condition setting module is used for establishing a node at the center of a tower top flange and connecting the node and a flange at the front end of a main frame through a rigid beam unit so as to simulate the main frame to transfer load, wherein the engagement of a yaw bearing ball and a gear between a yaw bearing and a yaw driving device is simulated by a rod unit only bearing pressure; the main frame, the yaw driving motor, the yaw bearing, the yaw brake caliper, the yaw brake disc and the joint surface between the tower top flanges are connected in a binding contact mode; and the calculation checking module is used for applying loads of all limit working conditions to the center position of the tower top flange, carrying out nonlinear solution on the finite element model under all limit working conditions, checking the stress magnitude and the dangerous position of the yaw brake disc, and comparing the value with the allowable stress value of the part to check the limit strength of the yaw brake disc. The specific implementation means of each module has been described in detail in the embodiment of the method, and is not described herein again.
Claims (10)
1. A method for checking the ultimate strength of a yaw brake disc of a fan is characterized by comprising the following steps:
1) establishing a geometric model containing a fan yaw brake load transfer path, wherein the geometric model at least comprises a main frame, a yaw driving motor, a yaw bearing, a yaw brake caliper, a yaw brake disc, a tower top flange and a tower;
2) importing the geometric model into finite element analysis software for mesh division;
3) establishing a node at the center of a tower top flange, and connecting the node and a main frame front end flange through a rigid beam unit to simulate the main frame to transfer load, wherein the engagement of a yaw bearing ball and a gear between a yaw bearing and a yaw driving device is simulated by a rod unit only bearing pressure; the main frame, the yaw driving motor, the yaw bearing, the yaw brake caliper, the yaw brake disc and the joint surface between the tower top flanges are connected in a binding contact mode;
4) and applying loads of all limit working conditions at the center position of the tower top flange, carrying out nonlinear solution on the finite element model under all the limit working conditions, checking the stress magnitude and the dangerous position of the yaw brake disc, and comparing the value with the allowable stress value of the part to check the limit strength of the yaw brake disc.
2. The method for checking the ultimate strength of the yaw brake disc of the wind turbine according to claim 1, wherein in the step 4), when an ultimate working condition load is applied to the center position of the tower top flange, the load is transmitted to the main frame through the rigid beam unit and is transmitted to the yaw brake disc through the yaw brake caliper so as to simulate the stress condition of the yaw brake disc.
3. The method for checking the ultimate strength of a fan yaw brake disc according to claim 1, wherein in the step 2), during grid division, a yaw driving gear is simulated by adopting a pipe unit and a beam unit, and the yaw driving gear is connected with a yaw driving motor through a rigid beam unit; the main frame, the yaw driving motor and the yaw brake disc adopt tetrahedral units to divide grids; and the yaw bearing, the yaw brake caliper, the tower top flange and the tower cylinder adopt hexahedral units to divide grids.
4. The method for checking the ultimate strength of the yaw brake disc of the fan according to claim 3, wherein the size of the adopted grids of the tetrahedral unit and the hexahedral unit is 30-100 mm.
5. The method for checking the ultimate strength of the fan yaw brake disc according to claim 3, wherein the number of the divided pipe units and the number of the divided beam units are 10-20.
6. A checking device for fan yaw brake disc ultimate strength is characterized by comprising a geometric model establishing module, a grid dividing module, a load and boundary condition setting module and a calculation checking module;
the geometric model establishing module is used for establishing a geometric model containing a fan yaw brake load transfer path, and the geometric model at least comprises a main frame, a yaw driving motor, a yaw bearing, a yaw brake caliper, a yaw brake disc, a tower top flange and a tower;
the meshing module is used for importing the geometric model into finite element analysis software for meshing;
the load and boundary condition setting module is used for establishing a node at the center of a tower top flange, and connecting the node with a flange at the front end of a main frame through a rigid beam unit so as to simulate the main frame to transfer load, wherein the engagement of a yaw bearing ball and a gear between a yaw bearing and a yaw driving device is simulated by a rod unit only bearing pressure; the main frame, the yaw driving motor, the yaw bearing, the yaw brake caliper, the yaw brake disc and the joint surface between the tower top flanges are connected in a binding contact mode;
and the calculation and check module is used for applying loads of all limit working conditions to the center position of the tower top flange, carrying out nonlinear solution on the finite element model under all limit working conditions, checking the stress magnitude and the dangerous position of the yaw brake disc, and comparing the value with the allowable stress value of the part to check the limit strength of the yaw brake disc.
7. The wind turbine yaw brake disc ultimate strength checking device according to claim 6, wherein when the calculation checking module applies an ultimate working condition load to the center position of the tower top flange, the load is transmitted to the main frame through the rigid beam unit and is transmitted to the yaw brake disc through the yaw brake caliper so as to simulate the stress condition of the yaw brake disc.
8. The wind turbine yaw brake disc ultimate strength checking device according to claim 6, wherein when the meshing module performs meshing, a yaw driving gear is simulated by adopting a pipe unit and a beam unit, and the yaw driving gear is connected with a yaw driving motor through a rigid beam unit; the main frame, the yaw driving motor and the yaw brake disc adopt tetrahedral units to divide grids; and the yaw bearing, the yaw brake caliper, the tower top flange and the tower cylinder adopt hexahedral units to divide grids.
9. The checking device for the ultimate strength of the yaw brake disc of the fan according to claim 8, wherein the size of the adopted grids of the tetrahedral unit and the hexahedral unit is 30-100 mm.
10. The checking device for the ultimate strength of the fan yaw brake disc according to claim 8, wherein the number of the divided pipe units and the number of the divided beam units are 10-20.
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| CN201610919339.0A CN106547963B (en) | 2016-10-21 | 2016-10-21 | A method and device for checking the ultimate strength of a fan yaw brake disc |
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| CN201610919339.0A CN106547963B (en) | 2016-10-21 | 2016-10-21 | A method and device for checking the ultimate strength of a fan yaw brake disc |
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| CN107729597B (en) * | 2017-08-29 | 2021-07-30 | 明阳智慧能源集团股份公司 | A spindle bearing raceway checking tool |
| CN109726410B (en) * | 2017-10-31 | 2022-12-27 | 广东省风力发电有限公司 | Calculation method for checking strength of yaw connecting bolt of wind turbine |
| CN108547740A (en) * | 2018-03-21 | 2018-09-18 | 内蒙古久和能源装备有限公司 | A kind of main frame of wind turbine generator system limited strength member computational methods |
| CN109299532B (en) * | 2018-09-17 | 2022-12-13 | 许继集团有限公司 | Method and system for checking strength of connecting bolt of main frame and rear frame of fan |
| CN109543241B (en) * | 2018-10-30 | 2023-07-14 | 浙江万向系统有限公司 | Automatic identification method for standard normal mode of brake disc |
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| EP3073109A1 (en) * | 2015-03-23 | 2016-09-28 | ALSTOM Renewable Technologies | Obtaining dynamic properties of a part of wind turbine |
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| CN103324805A (en) * | 2013-07-04 | 2013-09-25 | 沈阳华创风能有限公司 | Calculation method for checking ultimate strength of fan underframe |
| CN105069223A (en) * | 2015-08-05 | 2015-11-18 | 许继集团有限公司 | Method for checking ultimate strength and fatigue strength of wind turbine tower drum door opening |
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