physics project on air bags in car

1. AIR BAGS IN CAR FOR
SAFETY
SUBMITTED BY:
SUHEL AHMED
K17TS ROLL:14

2. Introduction
Air bag system
Air bag system wiring diagram
Working
Physics of air bag during collision
Air bag testing
Benefits of air bags
References
Conclusion
INDEX

3. INTRODUCTION TO AIR BAGS
>An air bag is an inflatable cushion
designed to protect automobile
occupants from serious injury in the
case of a collision
>The air bag is also known as an air
cushion restraint system(ACRS) or
an air bag supplemental restraint system
(SRS)
>This is because the air bag is designed
to supplement the protection offered
by seat belts

4. AIR BAG SYSTEM
>An air bag module
>crash sensors
>A diagnostic monitoring
unit(ECU)
>A steering wheel
connecting coil
>Wiring and connectors
Crash sensorAir bag module
Diagnostic
monitoring unit
Steering wheel
connecting coil

5. AIR BAG SYSTEM WIRING
DIAGRAM

6. WORKING
>The crash sensor senses the impact
>The diagnosis unit decides
>an electric signal is transmitted to the inflator assembly
>An electrical signal then ignites the igniting agent
>The gas generating agent ignites and generate gas
>”Air bags” inflate , while the “seat belt pretensioner”
simultaneously fastens the seat belt and absorbs the
shock received by the passenger
Actions mentioned above occur within 50 milliseconds

7. AIR BAG DEPLOYMENT
The air bag system ignites a solid propellant (NAN3),which burns extreme rapidly
to create large volume of nitrogen gas to inflate the bag .The bag then literally
bursts from its storage site and a second later ,the gas quickly dissipates through
BEFORE DEPLOYEMENT AFTER DEPLOYEMENT
A SIDE AIR BAG DEPLOYEDA FRONT AIR BAG DEPLOYED

8. PHYSICS OF AIR BAG DURING
COLLISION
The Inertia Theory : If an object moving at a constant velocity
continue at the same velocity unless an external force acts
upon them. This law , known as the law of inertia , is
demonstrated in the car collision
BASED ON NEWTON’S LAW:
F=m(-v/delta t)
Where,
F=Force on the body
M=mass of the object(Body)
Vi=velocity of the moving object(after collision it will decrease)
a=(v/delta t)=acceleration (after collision it will decrease)

9. CONTINUE………
The injury can be avoided by reducing the force on the
body. This can be done by two ways as:
>By increasing the time interval(delta t) over the force being
applied

10. >By spreading the force over large area of the body
Distribution of force over body

11. AIR BAG TESTING
This is a test rig which is setup in the laboratory

12. CRASH TESTING
Front air bag crash testing Side air bag crash testing
The air bag systems are crash tested under various temperatures
with and without loadings on the bag.
The results of the test are then fed to the computers where the
results are analysed

13. BENEFITS OF AIR BAGS
>Air bag save lives
>They also reduce injuries
>By providing a carefully controlled
gradient of deceleration, the human
body comes through the crash relatively
unharmed.

14. REFERENCES
>http://www.madehow.com
>http://auto.howstuffworks.com
>www.slideshare.net

15. CONCLUSION
>Air bags are of greater importance in today’s vehicles
since safety of human life is of prior importance
>So far safe riding and for saving the precious life the
safety bags must be implemented
>let’s hope every automobile manufacturer implement the
same

16. THANK YOU…