The Huntsman Automotive team gave Urethanes Technology International an overview of some of the issues driving change in the way that polyurethane can be used to reduce the noise, vibration and ride harshness (NVH) which passengers experience in a modern car.
Noise and vibrations come from a number of different sources said Andy Walton, business manager, automotive & flexible foam, EAIME (Europe, Africa, India and Middle East) in a telephone interview with Huntsman.
Peters, market sector manager automotive acoustics, Huntsman added, “There are a number of potential noise sources; road surface and vehicle construction leads to structure-borne noise, the engine and transmission generate airborne noise That noise needs to be attenuated or tuned to meet the OEM’s demands and branding rules. OEMs use inner dash and under carpet insulation to combat structure-borne noise and engine bay absorbers to reduce airborne noise. They also use engine bay absorbers for both in-car noise as well as environmental pass-by noise.”
Walton said: “Polyurethanes play important roles in minimising the effects of NVH in the cab, passenger compartment or cockpit of modern cars”
Inside the cab
Polyurethane foam can be found in a number of places inside the cab. Some areas, such as carpet backing are similar to non-automotive uses but the formulations are very different, as are the tasks the backing is asked to perform.
Residential carpet underlay has to provide comfort…