Abstract: An apparatus for simulating the acoustic performance of an automotive vehicle, the apparatus comprising: a processor configured to select an electrical input to be provided to the amplifier in dependence on one or more driving conditions for the vehicle, the electrical input indicating a desired acoustic output for a vehicle and being selected from a plurality of prestored electrical inputs; an amplifier configured to receive the electrical input from the processor and to generate amplified electrical signals of the acoustic output from the electrical input; a transducer configured to generate acoustic vibrations from electrical signals received from the amplifier; and a structural panel configured for placement on the body of the vehicle, wherein the transducer is mounted to the panel such that acoustic vibrations generated by the transducer are emitted from the panel to an environment within or surrounding the vehicle.

Abstract: A sound bypass device configured to transmit engine-generated sound pulses from an engine to a sound outlet whilst preventing flow of gases to the sound outlet, the sound bypass device comprising: an input tube configured to conduct the engine-generated sound pulses from the engine; and a sound transmission device connected to the input tube at a first end and to the sound outlet at a second end, the sound transmission device comprising: a first volume connected to the first end, a second volume connected to the second end, and a flexible diaphragm separating the first volume from the second volume and configured to transfer variations in pressure in the first volume to the second volume; wherein the first volume has a cross-sectional area that is greater at the diaphragm than at the first end and the second volume has a cross-sectional area that is greater at the diaphragm than at the second end.

Abstract: Method for the identification of poles (?n) and modal vectors (?n) 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, hypo -thesizing that the inlets induced by the road or rail surface on said vehicle cannot be traced back to a seque