Identification of the dynamic models of machine tool supporting systems. Part II: An example of application of the method

In this paper we present the results of the parameter identification of the spring-damping elements of the model of a real machine tool supporting system. The identification was carried out on the basis of the experimentally determined frequency response characteristics of the tested FWD-32J milling machine. We describe the experiments that were conducted in order to determine these characteristics and we give an example of how the identified model of this machine can be applied in simulation tests with a view to minimizing the relative vibrations between the tool and the workpiece. The model of the tested machine was created in the convention of the rigid finite element method complemented by the added option that allows us to model slideway joints. The frequency response characteristics that were used to identify, verify, and validate the model were determined by means of noise excitation. An originally elaborated computer program IDENT was used in the computations, and this has been described in detail in Part I of this paper. Very good consistency between the model and the object was achieved. The simulation tests that have been carried out made it possible to locate the weak points in the supporting system of the investigated machine tool.