My presentation is all about the handling of external and internal noise in vehicles which helps in increasing vehicle class by providing high customer satisfaction.The materials installed also helps in controlling of heat and vibration passenger cabin.The most common methods used in automobile are discussed.

1. National Conference on
Emerging Trends of Research in Applied Sciences,
Experimental & Computational Techniques
Organized By: Jodhpur institute Of Engineering & Technology
Changing Vehicle Class Using
Acoustical Engineering
Presented By:Ravina Dadhich

2. Inside This Presentation
Introduction
What is Acoustic?
Why we need to reduce Acoustic?
How to handle Acoustic Problems?
Damping Materials
Sound Absorbers
Conclusion

3. Introduction
Over last few years we have seen diversified advancements in
automobile industry which helps out in increasing the vehicle’s
class by providing extraordinary comfort to passengers. To
provide better comfort the acoustic performance is gaining a very
much importance. In order to fulfil the high customer
expectations the industry designers are spending a large amount
of money to control the noise ,heat and vibration problems in
passenger cabin.
This reduction of noise can be achieved with the combined effort
of both acoustical and automobile engineers.

4. What is Acoustic?
Acoustic is branch of physics that deals with problems
related to noise.

5. Why We Need to Reduce Acoustic?
• It reduces the vehicle’s efficiency.
• It directly affects the atmospheric noise.
• Causes irritation in passenger cabin.
• To as to give high customer satisfaction.

6. How to Reduced Acoustic Problems
The combined efforts of industry engineer give
rise several methods out of which two main are
discussed here:
1) Use of Damping Materials
2) Installation of Sound Absorbers

7. Damping Materials
 Damping is a physical term that refers to the
changing of energy.
 It takes energy from sound waves and converts
it into a silent energy.
 They acts as a shock absorber for sound waves.
 They are installed in the doors, in the roof,
under the carpet and behind the rear seat and
fire wall.

8. Types of Damping Material
1. Formable Floor Barrier Material:-
They are used to at irregular areas of floor plane.
They are light-weighted.
They contain neoprene material which also helps in
controlling the vibration problems.

9. 2. Moldable Road Noise Barrier:-
They are used to control the low frequency road
noise.
They are installed near wheel arches.
It contains the neoprene layer which creates the ‘air
spring’ which prevents the sound energy from
passing through the dense layer.

10. 3) Flexible Floor Barrier:
They are loaded with vinyl bass material.
They are installed on the floor base of
passenger cabin.
They are light-weighted.

11. 3)Flexible Road Noise Barrier:
 They are used to control high frequency noise.
 It consists mainly of neoprene material but a small
fraction of vinyl material gives it a great benefit and it
is most preferred damping material.
 They are installed on flat areas of the floor pan.

12. Sound-absorbing materials absorb most of
the sound energy.
They are used in a variety of locations and
have been used increasingly in the
construction of automobiles because of their
low weight
Some of the best materials are discussed
below which fits best in handling automobile
acoustic.
Sound Absorbers

13. Sound Absorbing Materials
1) Porous Asphalt:
 They are used in passenger cabin.
They not only used to reduce tire/road noise
but and reduce the splash up behind vehicles
during heavy rainfall.

14. 2) Smart Absorbing Materials
 The absorber is made of melamine foam
(made of melamine resin, a thermo set
polymer).
 The main advantage of material is that it is
lightweight, thin, efficient which gives out
promising results.

15. Conclusion
Sound and vibration parameters must be considered as
important elements regarding comfort and perceived
quality. These two parameters are one of the important
aspects for providing higher customer satisfaction. In
this presentation two most commonly used techniques
are discussed. These new advancement in ongoing
methods are helpful in handling acoustic problems due
to low frequencies. There is a need for an innovative
high- performance measurement technology to meet
increasing requirements with respect to increasing
customer expectations and shortened development
cycles.

16. Thank you!