METHOD FOR DETERMINING THE MODAL PARAMETERS OF ROAD/RAIL VEHICLE SYSTEMS AND FOR THE INDIRECT CHARACTERIZATION OF ROAD/RAIL TRACK PROFILES

WIPO
International Application Number PCT/IT2015/000255

Abstract
Method for the identification of the poles and modal vectors of a road or rail vehicle provided with at least two wheels and in working condition, by means of the analysis of the movements or speeds or accelerations (output of the system) acquired in assigned measuring points of said vehicle, wherein said poles and modal vectors are determined by means of the fitting of the data relating to said outputs of the system on the basis of a mathematical model which describes the interaction between road or railway and said vehicle, characterized by hypothesizing that said vehicle moves at constant speed on a rectilinear trajectory or bend with constant radius,  hypothesizing that said vehicle moves on a homogeneous and ergodic surface, whose roughness has a Gaussian distribution and that said at least two wheels move on a profile or on a plurality of profiles parallel with respect to each other, hypothesizing that the inlets induced by the road or rail surface on said vehicle cannot be traced back to a sequence of white noises and are correlated with respect to each other in time and/or space.

Keywords
Operational modal analysis for vehicles, modal parameter estimation, structural identification, rail/road input excitation, surface roughness parameter estimation.

Inventors
Prof. Giovanni De Filippis, Prof. Luigi Mangialardi, Ing. Davide Palmieri, Prof. Leonardo Soria.

Contact person
Prof. Leonardo Soria
E-mail: leonardo.soria@poliba.it
Tel: +390805962813