| The yaw brake system is an indispensable key component of the wind turbine,which ensures that wind turbines can stabilize yaw and precision wind to avoid wind energy loss.The yaw brake is the main actuator of the yaw system,and its braking performance directly determines the operational safety of the yaw system and the entire fan.Under the frequent yaw and braking of wind turbines,it is easy to cause yaw vibration instability and yaw brake cracking,which seriously affect the service life of each component.Therefore,it is important to carry out the yaw brake braking stability and fatigue resistance.Based on the analysis and discussion of the yaw brake system,this paper uses the theoretical analysis,numerical simulation and other methods,combined with the SCADA system related data,to carry out the study of the stability of yaw brake and the fatigue resistance of yaw brake.The main research contents are as follows:(1)Analyze the force transmission path of the yaw brake system according to the working principle of the yaw system,and clarify the working characteristics of the yaw brake;Taking a typical mountain wind field as an example,the actual monitoring and operation data of yaw brake in SCADA system is extracted,and the relationship between yaw operation and yaw braking times of 24 wind turbines in 2017 is analyzed,and then nonparametric estimation method is used to obtain Yaw operating cycle.(2)According to the engineering drawing of the relevant components of the yaw brake system,the model is modeled by Solidworks 3D software,imported into ABAQUS finite element software for assembly,and combined with the data of SCADA system,the finite element contact model of yaw brake system is established;According to the GL specification,the yaw brake cylinder is checked for strength;The contact pressure distribution of the friction lining and the brake disc and the force analysis of the contact surfaces of the yaw brake cylinder are carried out.(3)Establish finite element model for yaw brake stability,and use finite element complex eigenvalue analysis technology to carry out yaw braking stability research;Combined with the instability tendency coefficient,the influence of relevant braking parameters and structural parameters and physical performance parameters of important components on braking stability during yaw braking process is discussed.(4)Establish a finite element model of the yaw brake cylinder unit load,and formulate the load spectrum of the yaw brake cylinder;Based on the n Code Design-Life fatigue analysis software,the SN curve of the yaw brake cylinder is established,and the fatigue life analysis of the yaw brake cylinder is carried out.The effects of yaw time,material and wall thickness of two adjacent cylinders on the fatigue life of the yaw brake cylinder are discussed. |
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