Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : August 07, 2016 - August 10, 2016
An effective reduction technique is proposed for flexible multibody systems and the systems are meshed by spatial gradient-deficient beam elements of absolute nodal coordinate formulation (ANCF). The proposed reduction method can deal with both small and large deflection via enhanced Craig-Bampton method based on ANCF (ECB-ANCF). The enhanced Craig-Bampton (CB) method considers the effect of residual modes to construct the transformation matrix, such method obtains the natural frequencies and modes of the system more accurately in structural dynamics. To avoid using small deflection assumption, the proposed approach uses the initial bending stiffness matrices of the whole system to get the approximate modes of the flexible multibody system. Moreover, the nonlinear elastic force in reduced model is simplified by keeping some low-order nonlinear terms for a lower computational cost. Thus above two points result in a truncation error. Finally, one example which compare the reduced with full models in large deflection are presented to demonstrate the efficiency and accuracy of the proposed method ECB-ANCF.
