This paper presents an application of modal analysis, focused on the estimation of the impedance function of a mechanical system. In particular, the analyses aim to evaluate the forces transmission of a railway braking resistor to be mounted on the floor of a train carbody. The breaking resistor contains two cooling fans which force the air flow through the electrical resistances that dissipate the breaking energy by Joule effect: the high speed rotation of these fans represents a remarkable source of excitation which affects the system and passengers’ comfort. Previous tests showed that the structure were not adequate to filter the vibrations, thus the transmitted forces to the train carbody were not negligible. A proper reduction of the fans mechanical imbalance, achieved by new technology, leads to extremely good results which are now reported in this paper.
Influence of Fan Balancing in Vibration Reduction of a Braking Resistor
BRAGHIN, FRANCESCO;PORTENTOSO, MICHELE;SABBIONI, EDOARDO
2014-01-01
Abstract
This paper presents an application of modal analysis, focused on the estimation of the impedance function of a mechanical system. In particular, the analyses aim to evaluate the forces transmission of a railway braking resistor to be mounted on the floor of a train carbody. The breaking resistor contains two cooling fans which force the air flow through the electrical resistances that dissipate the breaking energy by Joule effect: the high speed rotation of these fans represents a remarkable source of excitation which affects the system and passengers’ comfort. Previous tests showed that the structure were not adequate to filter the vibrations, thus the transmitted forces to the train carbody were not negligible. A proper reduction of the fans mechanical imbalance, achieved by new technology, leads to extremely good results which are now reported in this paper.File | Dimensione | Formato | |
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