Comparative Study in the Structural and Modal Analysis of a Wind Turbine Planetary Gear Based on Material Reduction Criteria Using FEM

abdellah mohsine

Abstract


With the increasing demand for energy from the effective and smart materials, the need to minimize vibration impacts in the most engineered parts of the machine is becoming a more important factor.  Structures of high technology usually have severe expectations regarding structural dynamical requirements.  Removing Vibrations are fundamental to their performance. Passive damping can be used to eliminate vibrations by minimizing resonance response peaks. In this study, results of a numerical simulation on the influence of material cutting of the planet gear on vibration of a wind turbine planetary gear are presented using Finite element Method. The aim of this paper is to create through cuts on the face profile of the planet gear body with different size (four different angle values α and four different radius values R). A pilot model without removal material was modeled and submitted to simulation and serves as reference model for results comparison in terms of stress, deformation, frequency, Eigen-mode and harmonic response. 

The objective of this paper is to apply ANSYS software to determine and to compare the natural vibration modes and forced harmonic frequency responses for the planetary gear with different planet gear cut size in order to validate the best construction of the 16 studied cases.

The obtained result has shown that for the geometry with the material cutting parameter α =75°, R=16mm, the highest occurring stress is 43467 MPa for the frequencies between 4980 Hz and 5050 Hz. This stress value indicates the maximum value of the safety factor for the selected structure. So this chosen geometry represents the optimized design that makes it possible to economize the material and to reduce approximately 8.4% of the weight of the entire planetary gear of the wind turbine and so the vibrations of the entire planetary gear of the wind turbine could be reduced.


Keywords


vibration; material cut; frequency; planetary gear; harmonic response; Ansys

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DOI (PDF): https://doi.org/10.20508/ijrer.v9i2.9289.g7669

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