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Measurement Capabilities of Biofidelic 3.4 Kg Infant Dummy

Measurement Capabilities of Biofidelic 3.4 Kg Infant Dummy. N. Rangarajan, Y. Wang, T. Shams GESAC, Inc T. Fukuda, T. Yamada Aprica, Inc. Aprica 3.4 Kg Instrumented Dummy. Segmental Masses. List of Sensors - 1. 3-axis head angular velocity sensor 3-axis accelerometer at head CG

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Measurement Capabilities of Biofidelic 3.4 Kg Infant Dummy

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

  2. Aprica 3.4 Kg Instrumented Dummy GESAC, Inc

  3. Segmental Masses 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 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. GESAC, Inc

  6. Head Showing Instrumentation Cavity GESAC, Inc

  7. Neck Showing Bottom Load Cell GESAC, Inc

  8. Spine Layout GESAC, Inc

  9. Dummy Torso GESAC, Inc

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

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

  12. Head Impact Response GESAC, Inc

  13. Head Drop Test Setup GESAC, Inc

  14. Head Drop Test Response 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. GESAC, Inc

  16. Thorax Impact Setup GESAC, Inc

  17. Thorax Impact Response GESAC, Inc

  18. Abdomen Impact Setup GESAC, Inc

  19. Abdomen Impact Response GESAC, Inc

  20. Neck Pendulum Test Setup GESAC, Inc

  21. Neck Flexion and Extension Pulse GESAC, Inc

  22. Neck Flexion Test Response GESAC, Inc

  23. Neck Extension Test Response GESAC, Inc

  24. Neck Lateral Flexion Pulse GESAC, Inc

  25. Neck Lateral Test Response 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 GESAC, Inc

  27. Individual Sensor Response GESAC, Inc

  28. Total Sensor Response GESAC, Inc

  29. FlexForce on Dummy Abdomen GESAC, Inc

  30. Individual Sensor Response GESAC, Inc

  31. Combined Sensor Response 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. 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. 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. 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. 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. GESAC, Inc

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