Abstract: A method of forecasting the comfort performance in a vehicle equipped with a test mounted assembly in a selected position, traveling at speed V over smooth ground, with a maximum speed Vmax, by establishing a vehicle transfer function where the assembly has a tire with N substantially identical irregularities on its circumference, regularly distributed to excite the vehicle in a range of frequencies, measuring the forces at the wheel center, and multiplying the forces by the vehicle transfer function to forecast the noise and vibrations.

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.

Abstract: A method for predicting the comfort performance (noise, vibrations) in the cabin of a vehicle fitted with a prototype suspension system when the vehicle is rolling at a given speed on a rolling apparatus made of at least one obstacle, consisting of obtaining an overall transfer function for the vehicle fitted with a reference suspension system, measuring the forces that act at the attachment points of a prototype system, and calculating the noise and vibration outputs by multiplying the overall transfer function by the forces acting at the attachment points of a prototype system.

Abstract: Method for predicting the comfort performance (noise, vibrations) in the cabin of a vehicle 1 fitted with a prototype suspension system, when the said vehicle is rolling at a given speed V on rolling means 3 comprising at least one obstacle 4 of predetermined size, the said determination method consisting:

Abstract: A regenerative oxygen trap which uses an oxygen absorbing material formed of a solid solution of metal oxides having both an ionic conductivity through 0.sup.2.sup.- ions and a nonzero electrical conductivity, the material forming part of a circuit which also includes a source of electricity. The material is converted in an inert gas to its reduced form by the passage of a current therethrough, in which form it is effective for the absorption of gaseous oxygen.