NVH challenges of modern automotive powertrains English Free

The ‘ecological conscience’ of consumer, the CO2 reduction imposed by legislation and the low consumption tax policy adopted by majority of countries, motivate car manufacturers to develop new generation of low CO2 emission cars. The reduction of rolling friction (low resistance pneumatics), of air resistance and of overall mass is the design imperative for low consumption vehicles.
Still, the most important reduction of fuel consumption and CO2 emission is to be achieved by new generation of powertrain. This implies different new technologies which can represent a marked impact on NVH-behavior of engines.
In the past, NVH was considered as a secondary performance. However, the rise of high quality products made car manufacturers change their point of view. NVH has become a selective performance, allowing the positioning a car in the upper commercial product range, which generates the best profits. Therefore, in actual highly competitive automotive market, the acoustic comfort of vehicle is a major issue, particularly when power train noise and vibration are concerned...