Method for forecasting comfort inside a vehicle

Abstract

A method of forecasting the comfort performance (noise and vibrations) in a vehicle equipped with a test mounted assembly in a selected position, the said vehicle travelling at a given speed V on a travel medium of the smooth ground type, allowing an equivalent maximum speed Vmax of the vehicle to be attained (Vmax being greater than the given speed V), this method consisting in establishing an overall transfer function of the vehicle equipped in the same position with a reference mounted assembly comprising a tire and its mounting wheel, the said tire having N irregularities which are substantially identical and regularly distributed over the circumference of the assembly, these irregularities being selected to excite the vehicle in a range of frequencies from a minimum frequency Fmin to a maximum frequency Fmax in the course of travel over smooth ground. After measuring the forces resulting at the wheel center of the test mounted assembly travelling on the same travel medium, these forces are multiplied by the transfer function obtained with the reference mounted assembly to obtain a forecast of the noise and vibrations in the vehicle travelling at speed V, the said vehicle being equipped with a test mounted assembly in the selected position.

Description

technical field [0001] The invention relates to a method of predicting the level of noise and vibrations generated inside a vehicle running on a slippery surface, the vehicle being equipped with a mounting assembly consisting of tires mounted on its fitted wheels. Background technique [0002] Although great care is taken in the production and assembly of the different components that make up an assembly (tires and wheels) before it is installed on a vehicle, it is well known that any installed assembly has more or less Fewer irregularities or non-uniformities. When the vehicle is running, if the vehicle is equipped with the components, these irregularities or non-uniformities cause vibrations of different parts of the vehicle, which vibrations are different and variable according to the speed at which the vehicle is running. [0003] Non-uniformities of a mounted or rotating component are irregularities related to: [0004] - one or more defects or irregularities in the d...

AI Technical Summary

Problems solved by technology

However, this method requires the vehicle to be available and can only be done in good weather conditions, which can sometimes make the immobilisation period too long and thus increase the cost

Furthermore, the method is time-consuming and laborious for the operator, the measurement results are highly variable, and the method is expensive in the stage of implementation for a given vehicle tire

Images