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In today’s market for commercial vehicles, customer expectations for NVH requirements are stringent and market demand for quieter vehicles are growing day by day. Also the NVH requirements of vehicles are becoming a part of mandatory legislative requirements. These are the big challenges faced by automotive manufacturers and various techniques are used to meet them. In addition to sound reducing components such as silencer, resonator and dampers, acoustic materials are widely used in commercial vehicles for sound attenuation. They play a vital role in improving the NVH levels and human comfort of vehicles. Foam based materials such as polyethylene, poly-urethane and melamine possess good sound absorbing characteristics and attenuate sound. They are used around high noise sources such as powertrain, under bonnet, cabin etc. Interestingly if additives are added to them, their sound absorbing characteristics improve based on the proportion and type of additives. This paper discusses the preparation, testing and analysis of effects on acoustic properties of foams with ceramic additives such as alumina, silica etc. The acoustic improvement using additives in various frequency ranges are compared and at system level and vehicle level in detail.
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