摘要：A reduced-order model is constructed to predict, for the low-frequency
range, the dynamical responses in the stiff parts
of an automobile constituted of stiff and flexible parts. The
vehicle has then many elastic modes in this range due to the
presence of many flexible parts and equipment. A nonusual
reduced-order model is introduced. The family of the elastic
modes is not used and is replaced by an adapted vector basis
of the admissible space of global displacements. Such
a construction requires a decomposition of the domain of
the structure in subdomains in order to control the spatial
wave length of the global displacements. The fast marching
method is used to carry out the subdomain decomposition.
A probabilistic model of uncertainties is introduced. The parameters
controlling the level of uncertainties are estimated
solving a statistical inverse problem. The methodology is
validated with a large computational model of an automobile.
