Abstract: For the needs of studying the effect of joints on dynamic characteristics of a machine tool and dynamic parameters optimization design in the generalized stiffness field, a concept and identification method of dynamic stiffness participation factors of joints based on the generalized dynamic information model is proposed. The response surface method (RSM) is employed to establish generalized dynamic information models, which depict the relationship between the dynamic stiffness of the spindle nose and the dynamic parameters of joints in the generalized stiffness field. Unit changes of dynamic stiffness of joints are taken as the input vectors of the established response surface model to calculate the variation values of dynamic stiffness of the spindle nose, for the identification of the dynamic stiffness participation factors of joints. Taking a precision horizontal machining center as research objective, the method is applied on the dynamic stiffness participation factors identification and test verification of the linear guide and ball screw of the column-spindle system. Results show that key joints that have relatively significant influence on dynamic characteristics of the machine tool can be identified effectively, to provide technical support for quantitative design of dynamic parameters of joints by this method.

Key words: Dynamic stiffness participation factors, Generalized dynamic information model, Joints, Parameter identification, Response surface method