1. Measurement Capabilities of Biofidelic 3.4 Kg Infant Dummy
N. Rangarajan, Y. Wang, T. Shams
GESAC, Inc
T. Fukuda, T. Yamada
Aprica, Inc
11/22/2018
GESAC, Inc

2. Aprica 3.4 Kg Instrumented Dummy
11/22/2018
GESAC, Inc

3. Segmental Masses Segment Mass Target Actual Head 1067 999 Neck 168 79
Torso
1229
1204
Upper arm 77 83
Lwr Arm& Hand 59 92
Upper leg
206
192
Lwr leg & foot
126
152
Total Mass
3400
3320
11/22/2018
GESAC, Inc

4. List of Sensors - 1 3-axis head angular velocity sensor
3-axis accelerometer at head CG
3-axis accelerometer at top of neck
3-axis accelerometer at neck bottom
1-axis Fz load cell at neck bottom
3-axis accelerometer at chest CG
11/22/2018
GESAC, Inc

5. List of Sensors - 2 3-axis accelerometer at pelvis.
1-axis Fz load cell at lumbar/pelvis.
String potentiometer on rib to measure rib deflection.
Pressure mat on abdomen to measure abdominal loads at 5 locations.
Total of 26 channels.
11/22/2018
GESAC, Inc

6. Head Showing Instrumentation Cavity
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GESAC, Inc

7. Neck Showing Bottom Load Cell
11/22/2018
GESAC, Inc

8. Spine Layout
11/22/2018
GESAC, Inc

9. Dummy Torso
11/22/2018
GESAC, Inc

10. Rib Construction Dummy has a single rib made of Polycarbonate.
Damping is provided by damping material used in adult dummies.
11/22/2018
GESAC, Inc

11. Head Impact Test Setup Corridors scaled from adult.
Corridors and results shown in next slide.
11/22/2018
GESAC, Inc

12. Head Impact Response
11/22/2018
GESAC, Inc

13. Head Drop Test Setup
11/22/2018
GESAC, Inc

14. Head Drop Test Response
11/22/2018
GESAC, Inc

15. Biofidelity of Head Response
After the dummy was designed and tested, we realised that the head response in drop tests are higher than the response of cadaver heads in similar tests which is around 60g. The head can be tuned to that response if the customer requests it.
11/22/2018
GESAC, Inc

16. Thorax Impact Setup
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GESAC, Inc

17. Thorax Impact Response
11/22/2018
GESAC, Inc

18. Abdomen Impact Setup
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GESAC, Inc

19. Abdomen Impact Response
11/22/2018
GESAC, Inc

20. Neck Pendulum Test Setup
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GESAC, Inc

21. Neck Flexion and Extension Pulse
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GESAC, Inc

22. Neck Flexion Test Response
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GESAC, Inc

23. Neck Extension Test Response
11/22/2018
GESAC, Inc

24. Neck Lateral Flexion Pulse
11/22/2018
GESAC, Inc

25. Neck Lateral Test Response
11/22/2018
GESAC, Inc

26. Flexiforce Evaluation
Preliminary evaluation by 4 m/s impact on 2” thick structural foam
Foam back supported rigidly
Compare Flexforce with pendulum load cell
11/22/2018
GESAC, Inc

27. Individual Sensor Response
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GESAC, Inc

28. Total Sensor Response
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GESAC, Inc

29. FlexForce on Dummy Abdomen
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GESAC, Inc

30. Individual Sensor Response
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GESAC, Inc

31. Combined Sensor Response
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GESAC, Inc

32. Summary - 1
A 3.4 kg infant biofidelic, instrumented dummy has been developed.
Anthropometric specifications were developed from direct measurements and scaling.
Impact response corridors were scaled from adult impact response corridors. Impact tests show that dummy either meets or is very close to desired corridors.
11/22/2018
GESAC, Inc

33. Summary - 2
The dummy is instrumented to measure accelerations at the upper and lower neck, chest CG, head CG, and pelvis.
A damped rib structure allows the chest impact response to exhibit realistic hysteresis.
11/22/2018
GESAC, Inc

34. Summary - 3
String potentiometer on the rib allows measurement of chest compression.
Angular velocity sensors in the head allow direct measurement of head angular velocity.
11/22/2018
GESAC, Inc

35. Summary - 4
Load cells at the bottom of the neck and on the lumbar spine enable measurement of axial forces on the cervical and lumbar spines.
Packaged FlexiForce sensors shows promise as an impact load measurement device when tested on blocks of foam supported in the back.
11/22/2018
GESAC, Inc

36. Summary - 5
FlexForce sensors show about 80% of the load levels shown by load cell on impactor.
FlexForce package on the abdomen shows a low level of force when compared to the impactor load cell.
This phenomenon will be investigated in future.
11/22/2018
GESAC, Inc