To improve the fixed joint interfaces' modeling precision and versatility, considering the different characteristics of the fixed joint interfaces in normal and tangential directions, the dynamics parametric modeling method of fixed joint interfaces based on equivalent transversely isotropic virtual material is proposed. The micro contact portion of two contact surfaces in fixed joint interfaces is regarded as a virtual transversely isotropic material with a unchanged section, which is rigidly linked with two components situated at both sides of the fixed joint interfaces. Based on contact fractal theory and contact stiffness fractal model, according to the definition of transversely isotropic material's elastic constants, the theoretical calculation models of equivalent virtual material's elastic constants and density are put forward. On above basis, finite element modeling and modal analysis of one experimental model that has fixed joint interface are conducted, and then, the theoretical modals are compared with the experimental modals. The results show that the theoretical modals' first six order vibration shapes are in excellent coherence with the experimental modals', and the absolute values of the relative errors of corresponding natural frequency are less than 10%, which shows the correctness and effectiveness of the modeling method. This method provides a new method for CNC machine tools' fixed joint interfaces dynamic modeling, and the seamless integration of fixed joint interfaces dynamic modeling and finite element analysis software is achieved.
ZHANG Xueliang
,
FAN Shirong
,
WEN Shuhua
,
WANG Yusong
,
CHEN Yonghui
,
LAN Guosheng
. Modeling Method of Fixed Joint Interfaces Based on Equivalent Transversely Isotropic Virtual Material[J]. Journal of Mechanical Engineering, 2017
, 53(15)
: 141
-147
.
DOI: 10.3901/JME.2017.15.141
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