Etienne Nitidem, Wittur Holding, Germany presented "MODELLING AND SIMULATION OF THE DYNAMIC BEHAVIOUR OF LIFT SYSTEMS WITH CANTILIVER CAR SLINGS". 

A case of “cantiliver” structure with “slings” (especially suitable for a car with two or three entrances) is specifically analyzed for its vibrations. An overview is offered of the various types of excitation (self-excitation and excitation from an external source). Starting from a single and defined structure and analyzing the vibrations and deformations. The calculation sequence is possible from a first schematic layout, from the relevant physical model (mass distribution, number and location of elastic and damping elements), resulting from the mathematical model, and then from the correct use of the chosen calculation code (MRM320). An essential role in these phenomena is provided by various types, installation s and performance of gears. Obviously practical steps have been made to verify the results of the mathematical models. The interesting conclusion is that the cantilever solution with three entrances meets the customer’s special requirements. This solution, however, requires a careful distribution of masses and dampers to prevent vibration phenomena which otherwise would undermine the ride comfort and reliability of the components.