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Automotive Product Finder Magazine | How to reduce cabin noise of an automotive
How to reduce cabin noise of an automotive
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The amount of noise entering an automotive cabin is one of the key factors deciding an occupant’s comfort. With increased customer buying power, and strong customer preference towards ride quality and comfort, limiting cabin noise will be an important aspect for automobiles of the future, says Sathyajith TK.
The amount of noise entering an automotive cabin is one of the key factors deciding an occupant’s comfort. Though cabin noise should never be completely insulated, the comfort can be increased by reducing cabin noise levels. The three major sources of noise in an automobile are the tires, the wind and the mechanical components/structural noise.
Cabin noise originating outside the compartment can be reduced by adding layers of materials having acoustic properties to damp, absorb or insulate vibrations. Depending on the case, the acoustic material can be applied over the floorboard, boot surfaces, inside of the doors, roof, bonnet, etc. These materials are generally quite effective in reducing the overall noise level by suppressing, reflecting or absorbing sound waves. Deadening pads on floors are one of the most economical ways to control cabin noise as the floor generally acts as an amplifier of noises coming into the cabin from underneath the car. Quieter tires are also found to be an effective solution. Sound transmitted through airborne paths can be effectively blocked using sound insulating materials. However adding acoustic materials does not eliminate drumming, droning or noises caused due to resonance.
Depending on the origin of the noise and the path, a noise path analysis can be conducted and adequate measures can be taken to minimise the sound that reaches the vehicle interior. For example, engine noises transmitted structurally can be minimised by better vibration-isolating mounts, treating resonant surfaces, etc. Plugging gaps and sound-absorbing treatments can be used to control airborne engine noises.
Many of the cabin noise problems are also design problems that engineers have to take care of during the design of the automobile. This is done by an NVH analysis, which dictates the design factors resulting in a comfortable experience while driving a vehicle. Various tools are used to measure force, impact, vibration, etc., and also scans that can observe movements of any surface. NVH (Noise, vibration, and harshness) forms a large part of the automotive design and impacts all areas of the vehicle design.
With the market going towards Electrical Vehicles (BEV), there will be new challenges in NVH due to battery cooling noises, motor noises, and other noises becoming prominent due to the absence of standard noises created by the internal combustion engine. Due to the presence of more high-frequency noises in a typical BEV, and lower overall weight of the vehicle, the specific acoustic design would be needed to achieve the required NVH levels.
With increased customer buying power, and strong customer preference towards ride quality and comfort, limiting cabin noise will be an important aspect for automobiles of the future.
About the author:
Sathyajith TK is the Vice President at AXISCADES Engineering Technologies Ltd - a leading, end-to-end engineering solutions and product company that delivers business value across the entire engineering life-cycle.
Plugging Gaps And Sound Absorbing Treatments
AXISCADES Engineering Technologies
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