Restrain System Biomechanics

Question 1

Explain Process of developing Restraints.

Answer 1

Question 2

Explain the Circle of Life

Answer 2

Question 3

What happens in a Frontal Crash with an Unrestrained Occupant?

Answer 3

Question 4

Seat Belt Biomechanics – Fundamental Mechanical Concepts?

Answer 4

Seat Belt Biomechanics – Fundamental
Concepts
Restraint – Mechanical

• Maximize the time which the restraint force is applied
• Maximize the distance travelled over the ground by the occupant
• Maximize the force below injourious level

Question 5

Seat Belt Biomechanics – Fundamental Anatomical Concepts?

Answer 5

Restraint – Anatomical

• Minimize local deformation and rate of deformation
• Maximize the area of the restraining force
• The magnitude of the restraining forces should not exceed the force tolerance of that region

Question 6

What are the Fundamental Restraint Kinematics concerning seat belt.

Answer 6

Question 7

Principle of Buckle Pretensioner?

Answer 7

Question 8

What is a Pyrotube Retractor?

Answer 8

Question 9

Comparison of Belt System With and Without Pretensioner.

Answer 9

Question 10

Explain Shoulder Belt Force Limitor.

Answer 10

Question 11

What is the Effect of Belt Force Limitation?

Answer 11

Question 12

Adaptive Force Limiting?

Answer 12

Question 13

What is the Effect of Early Coupling?

Answer 13

Question 14

Ideal coupling?

Answer 14

Question 15

Effect of Pre-Pretensioning?

Answer 15

Question 16

Effect of slack on initial time of crash - 1.5 s prebrake.

Answer 16

Question 17

Inflatable Belt – Contact Pressure on Chest?

Answer 17

Question 18

Explain the geometry for Inflatable Belts.

Answer 18

Question 19

Chest Deflections with different dummies and belts.

Answer 19

Question 20

Impact of different belt geometires on Chest Excursions?

Answer 20

Question 21

What is IARV?

Answer 21

Injury Assessment Value (IARV) is a human response level below which
a specified significant injury is unlikely to occur for a given individual

Question 22

Explain The Negative Chest Deflections recorded in these tests areassociated with one of two
potential phenomena concerning 4-Point Belt.

Answer 22

4-Point Belt
The Negative Chest Deflections recorded in these tests are
associated with one of two
potential phenomena:
1) a straightening of the spine with a concomitant
change in rib angle causing expansion of the
ribcage (ribs angled down have a smaller depth
than ribs that are horizontal)
2) the inertial effect of the organs impacting the ribs
during the test, as the shoulders and pelvis

Question 23

Explain Integrated Booster Cushion.

Answer 23

Question 24

Explain Inflatable Restraint Biomechanics

Answer 24

Question 26

Explain the Inflatable Restraint Biomechanics Head and Face Contact Mitigation

Answer 26

Question 27

Explain Inflatable Restraint Biomechanics Load Sharing, Force Distribution, and Work

Answer 27