are to be identified in that case the frequency responses of the model are compared with the measured frequency responses with the help of an algorithm for optimization of functions with numerous variables the estimated model parameters are changed to achieve the greatest possible agreement the model with the identified parameters forms the basis for design of an optimum regulator for active vibration damping at the elevator car application_number US 4900505 A description the mbs model has to reproduce the significant characteristics of the elevator car with respect to travel comfort since in the case of identification of the parameters it is possible to operate only with linear models all non linear effects have to be disregarded the first natural frequencies of the elastic elevator car are so low that they can overlap with the so termed solid body natural frequencies of the entire car as shown in fig1 at least two rigid bodies are required for modeling an elastic elevator car 1 namely a car body 2 and a car frame 3 the car body 2 and the car frame 3 are connected by means of elastomeric springs 4 1 to 4 6 forming a so termed car insulation 4 this reduces the transmission of solid borne sound from the frame to the car body for modeling a rigid elevator car 1 it is sufficient to consider the car body and.