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Vehicle NVH is one of the key parameters in defining the perception quality of a vehicle. Interior noise refinement is necessary from comfort point of view whereas exterior noise should also be controlled to meet the environmental legislations. The paper focuses on the NVH development of a new air intake system. The new air intake system is designed keeping in mind the targets for fuel efficiency, torque, power output and cost. For the said improvements, significant changes are incorporated in the air tank structure, runner and plenum designs. These changes are bound to impact the NVH performance. The air intake noise can broadly be classified into structural radiation and orifice noise. In the current scope of study, the radiated noise from the air intake system is investigated. To trouble shoot the structural radiation, techniques like Experimental Modal Analysis (EMA) and Finite element normal mode / frequency response analysis have been carried out.

Three-cylinder Engine without balancer shaft is a recent trend towards development of lightweight and fuel-efficient powertrain for passenger car. In addition, customer's expectation of superior NVH inside vehicle cabin is increasing day by day. Engine mounts address majority of the NVH issues related to transfer of vibration from engine to passenger cabin. Idle vibration isolation for a three-cylinder engine is a challenging task due to possibility of overlapping of Powertrain's rigid body modes with engine's firing frequency. This Overlapping of rigid body can be avoided either by modifying mount characteristic or by changing the position of mounts based on multi-body-dynamics (MBD) simulation. This paper explains about two types of engine mounting system for a front-wheel drive transversely mounted three-cylinder engine. The base vehicle was having three-point mounting system i.e. all three engine mounts were pre-loaded.