| With the continuous development of the wind power industry,it constantly puts forward higher requirements on the stability and reliability of wind turbines to reduce the failure rate of products.As an important part of wind power equipment,the yaw brake system plays a vital role in the operation of the entire wind turbine.However,some problems often occur during the yaw braking process of wind turbines.In order to study the cooperative relationship between the components of the yaw brake system,and also to study and solve the various problems existing in the actual yaw brake process of the wind turbine.According to the requirements of partners,the topic takes the 2MW wind turbine yaw braking system as the study object.A friction tester for the yaw brake system of the fan was designed to make the yaw brake system conduct friction brake test under the actual working conditions.The relevant physical parameters of the yaw braking system are measured directly or indirectly through the yaw braking friction test,which provides data support for studying and solving the problems of the yaw braking system in the actual yaw braking process and further revealing the failure mechanism of yaw brake system.The overall design idea is: the structural design work is based on the relevant components of the yaw braking system.Considering that the difference between the rotating part of the test machine and the actual fan during braking will cause the gap of the inertia moment,the inertia moment compensation is designed.In the scheme,the hydraulic loading system and the measurement and control system are designed at the same time so that the testing machine can normally carry out the relevant test work of the yaw braking system.This paper analyzes the principle of friction braking,deduces the calculation formula of the resistance torque generated by friction resistance.The structure and working method of the yaw system are introduced,and the design difficulties of the two test machines for the inertia moment compensation scheme and the loading scheme are introduced in detail.Using the structural modular design method to design the overall design scheme of the friction testing machine.Under the overall design scheme of the testing machine,the mechanical structure design of each module of the testing machine is carried out,and the structural optimization design of some structural parts is carried out under the premise of meeting the requirements,and the overall assembly drawing,component drawing and part drawing of the testing machine are drawn;The key components are established model simply by using software of Solidworks,using the finite element analysis software Ansys to analyze the relationship between the yaw brake disc shape variable and the load size.Calculating the specific range of the load value when the brake disc shape variable meets the requirements,the structural strength of key parts is checked.According to the test requirements,the driving system and hydraulic system of the testing machine are designed.The relevant standard parts such as drive motor,hydraulic cylinder and hydraulic pump are determined,and the schematic diagram of loading hydraulic system is drawn according to the selected hydraulic control components.The measurement and control system of the testing machine is designed and various sensors required for the measurement system were selected,the control system of the test machine was designed based on PLC,and the PLC program was written.The yaw brake system friction test machine studied in this project belongs to a joint research and development project with a domestic wind power research institute.The yaw brake system friction test machine program meets the requirements and the design drawings have been reviewed.The machine could carry out friction brake test of the yaw brake system effectively. |
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