FRONTAL CRASH OF BIW MODEL

TITLE: FRONTAL CRASH OF BIW MODEL

OBJECTIVE: TO DETERMINE THE RESULTS OBTAINED DURING THE FRONTAL CRASH OF A BIW MODEL.

• Initailly I look for the conditions mentioned by the instructor.
• Unit sysytem used is [Kg mm ms].
• I have make sure that there is no penetrations.
• Created a rigid wall with 0.1 friction.
• Used time step control DT/NODA.
• Intial velocity is given 15.6mm/ms.
• I have made the correction in CG by adding masses.
• Now finally setting up the output request and then run the simulation.
• The following results are obtained.

• Total simulation time=43min.34s
• Total number of cycles=2614.12
• Some amount of mass error is seen i.e there is aadition of mass to reduce the time step.
• Some amount of energy error is seen i.e there will be little bit of hourglass energy.

1. SECTIONAL FORCE IN RAIL

A section is made to see the forces acting on the rail component .

• Approx from 8ms forces start fluctualting and maximum is around 60ms.

2. FORCE RECIVED ON RAILS FROM BUMPERS.

3. SHOT GUN CROSS SECTIONAL FORCE

• Here also similar kind of result is seen but the peaks are low i.e amount of external force is low compare to rail.

4.HINGED PILLAR CROSS SECTIONAL FORCE

• Here it can be seen that upto 10ms there is no force acting on the component but after that maximum force is being applied that can be hanled by the component.

5. A PILLAR CROSS SECTIONAL FORCE.

• Maximum forces are absorbed by the A pillar as it is fluctuating upto maximum.

6. ACCELERATION CURVE ON THE BASE OF B PILLAR.

• Maximum acceleration can be seen around 68ms.

7. INTRUSION NO.1 ON DASH.

• Maximum on 80ms.

Intrustion = 758-643=115 units.

8. INTRUSION NO.2 ON DASH

Intrusion=770-723=47units.

• Now I look for global variables.

1. INTERNAL ENERGY

• It seems to be normal as both are moving vise versa.

2. HOUR GLASS ENERGY

3. CONTACT ENERGY

4. TOTAL ENERGY

5. VELOCITY IN X DIRECTION.

RESULTS :

• THERE IS SOME ADDITION OF MASS DUE TO TIME STEP CONTROL.
• MAXIMUM FORCES ARE ABSORBED BY THE RAILS FROM BUMPER AND A PILLAR.
• INTRUSION 1 IS LESS THEN INTRUSION 2.

CONCULSION: THE FOLLOWING RESULTS CURVES ARE OBTAINED AND SEEMS TO BE NORMAL.

THE REFERENCE OF INTRUSION1 1 AND 2 ARE GIVE IN THE MODEL WHICH IS PROVIDED IN THE LINK GIVEN BELOW.

https://drive.google.com/drive/folders/1P6jxCxVaRt9h5E6SgrSRiI8PTO0JcnmZ?usp=sharing