Papers by Keyword: Dynamics Characteristics Analysis

Abstract: Due to having the features of high accuracy, high stiffness, high load capacity and longer service life, the hybrid bearing spindle system is widely used in grinding. This paper presents an analysis method of hybrid bearing spindle dynamic characteristics. The method uses CFD method to solve the oil film pressure field, instead of Reynolds equation, in order to obtain the oil film stiffness and damping. With the obtained oil film stiffness and damping to build the appropriate constraints, 3D finite element model of the hybrid bearing spindle system is established, and the modal analysis of the spindle system is carried out. Compared the analysis results with the theoretical calculation results, the feasibility and correction of the method are proved.

Abstract: A 2.5MW wind turbine blade is modeled. The maximum static stress obtaining by the finite element method is compared with the theoretical analysis’s. The results acquired by both of them are same with each other, which validate the rationality of the finite element computational modeling. We find out the weakness regions of the blade by modal analysis on blade. This parper studies the effects of the axial of the fibrous layer, the proportion of axial fiber and the number of layers on the blade dynamic characteristic, respectively, and designs an optimization scheme to improve the blade dynamic characteristic. The research shows that adopting multiaxial, the rational fiber layers' proportion and increasing the layer number can be used to enhance the blade strength; the optimization scheme of the blade layer design in this way can improve the blade dynamic characteristic effectively and apparently.