Load Modal Analysis Of 300W Wind Turbine Blade Under Different Working Conditions

The impeller is a component of the wind turbine that receives wind energy.Its structural dynamic characteristics directly affect the operation of the wind turbine,and the modal parameters are the parameters that best reflect the quality of the structural dynamic characteristics.During the operation of the wind turbine,the external load such as centrifugal force load and aerodynamic load will change its modal parameters with the load.In this paper,two methods of finite element and experiment are used to study the influence of load on the blade modal parameters under different working conditions,which provides a reference for the next working mode of the blade.First,the theoretical calculation is used to obtain the centrifugal force load and the aerodynamic load,and then the correspondence between the wind speed,the rotation speed and the load is obtained by analyzing the vehicle test data and the generator power test data.The finite element and modal test methods were used to analyze the blade modal respectively to simulate the actual working state of the blade and obtain the modal parameters of the blade under different working conditions.From the test and finite element results,we can see that centrifugal force and aerodynamic force have no effect on the first-and second-order swing modes of 300W blades.The centrifugal force of the blade under different working conditions will increase the first-order natural frequency of the blade,and the aerodynamic force has no effect on the natural frequency.The centrifugal force increases from 0N to 735.075N,the first-order natural frequency increases from 31 Hz to 42 Hz,and the second-order natural frequency increases from 102 Hz to 123 Hz.The centrifugal force continues to increase from 735.075N to 1460.349N,the first-order natural frequency increases from 42Hz to 45Hz,the second-order natural frequency increases from 123Hz to 144Hz;the aerodynamic force increases from 0N to 1N,and the first-second natural frequency of the blade does not occur change.