Research of the dynamical characteristics of "spindle unit" mechanical system
Mathematical model of spindle unit has been developed. Spindle unit is considered to be complex mechanical vibratory system that influenced by polyharmonic excitation. “Spindle unit” system consist of three partial subsystems: tool/workpiece, spindle and quill, elastically mounted on machine bed. Joints of subsystems are: connection of mandrel with spindle and bearing supports of spindle. For making equilibrium equations in points of subsystems disconnection method of dynamical compliances is used. Dynamical compliances of subsystems are defined by using of initial parameters method in matrix form. Calculated and experimental results of natural vibration frequencies of grinding spindle unit ВСЗ 27-65.250 А, mounted on machine table, are given.