Analysis on dynamic characteristics of guided projectile body based on CS-FEM
When the conventional finite-element method uses the hexahedral element to explore the dynamic characteristics,the calculation error is large and the element distortion can't be avoided because of the numerical model's large stiffness.There-fore,in this article,based on the conventional finite-element method,the gradient smoothing technology is introduced,and the element-based smooth finite-element method(CS-FEM)is used to explore the guided projectile's dynamic characteristics.This method can effectively reduce the numerical model's stiffness without coordinate transformation and shape function derivation,so as to avoid the accuracy reduction and the difficulty in solution caused by the element distortion.The calculation results show that with the same number of elements,CS-FEM effectively enhances the accuracy in solving the projectile's natural frequency and vi-bration mode,and at the same time a high convergence speed is ensured.It will be widely applied in the analysis on the dynamic characteristics of guided projectiles.
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