Patent ID: 8731878

Claim:
A method for predicting noise comfort performance corresponding to an acoustic level or vibratory level or both in a cabin of a vehicle with a body-shell and a suspension system linked to the body-shell by at least one point of attachment, the vehicle rolling at a given speed V on a rolling device that includes on its rolling surface at least one irregularity of a predetermined dimension, the method comprising: determining, using a computer, a global transfer function (T body-shell ) of the body-shell for a point of attachment to the cabin; determining a global admittance (Y body-shell ) of the body-shell for a point of attachment of the suspension system to the body-shell; determining a global impedance (Z S ) of the suspension system for the point of attachment to the body-shell; determining, while rolling, lockup loads (F S b )of the suspension system at the point of attachment to the body-shell; and combining together the global transfer function of the body-shell, the global admittance of the body-shell, the global impedance of the suspension system, and the lockup loads of the suspension system to obtain a prediction of a noise comfort performance (P) inside the cabin, wherein, to predict the noise comfort performance of the vehicle equipped with the suspension system, a formula of: P=T body-shell *[I+Z S*Y body-shell ] −1 *F S b is calculated, in which, for each frequency studied: P is a comfort performance of the vehicle in the cabin, and is a matrix of dimensions m, 1, with m being a number of measurement points in the cabin; T body-shell is the global transfer function of the body-shell, and is a matrix of dimensions m, n; I is a unit matrix of dimensions n, n, n being a number of predetermined directions of excitation of the point of attachment; Y body-shell is the global admittance of the body-shell, and is a square matrix of dimensions n, n; Z S is the global impedance of the suspension system, and is a square matrix of dimensions n, n; and S b corresponds to the lockup loads of the suspension system, and is a matrix of dimensions n, 1.