TY - JOUR
TI - An efficient optimization method for structures with local non-linearity
AU - Zheng Zhao-Li
AU - Wang Yu-Qi
AU - Zhang Di
JN - Thermal Science
PY - 2016
VL - 20
IS - 13
SP - 879
EP - 886
PT - Article
AB - During the operation of turbines, one of the common accidents is due to the  structure failure of blades. The contact model with strong non-linearity and  time variation makes it difficult to be analyzed. In this paper, firstly, the  contact model is described by using fractal theory. Secondly, the new method  for the optimization of turbine blade is proposed, which is a kind of  structure with local nonlinearity and multi degree of freedom. The method  reduces the number of degrees of freedom by forming a new super element,  which makes the linear part of turbine blade without repeated calculation in  the non-linear iteration process. Therefore, it can shorten the calculation  time and reduce the demand for computing resources. Finally, an optimization  of the turbine blade is carried out, and the maximum equivalent stress  reduces by 13.19%, which proves the effectiveness of the new optimization  method.