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Finite Element Analysis Demonstration

by Wenyu Zhao last modified 2010-01-28 15:33

 

 

Background 

Finite Element Method (FEM), which is "a numerical technique for finding approximate solution of partial differential equation" [1], is widely applied in automotive, biomechanical, and aeronautical industries for designing new products, as well as predicting the properties and finding the root causes of failure. Using FEM, the cost and time of R&D can be greatly reduced.

In this simulation on1.5MW Vertical Axis Wind Turbines, FEM helps tremendously in evaluating vibration mode, weakest parts, buckling failure load and also in optimizing operation conditions, materials, and costs.    


Important Results

The following results are achieved from FEM. They can be feedback to improve the future design and are also important for condition monitoring of wind turbine operations.

(1) Resonance is less likely to occur when the rotating speed of VAWT is 15r/min ~ 20r/min;

(2) The structural stiffness of blades is the weakest in the entire wind turbine;

(3)The excitation frequencies of wind turbine are close to the first-order, third-order and fourth-order natural frequencies;

(4)The first-order critical buckling load is 12376kN.

 

[1] Finite Element Method,http://en.wikipedia.org/wiki/Finite_element_method.


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