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

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

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

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

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

Head Showing Instrumentation Cavity 11/22/2018 GESAC, Inc

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

Spine Layout 11/22/2018 GESAC, Inc

Dummy Torso 11/22/2018 GESAC, Inc

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

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

Head Impact Response 11/22/2018 GESAC, Inc

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

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

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

Thorax Impact Setup 11/22/2018 GESAC, Inc

Thorax Impact Response 11/22/2018 GESAC, Inc

Abdomen Impact Setup 11/22/2018 GESAC, Inc

Abdomen Impact Response 11/22/2018 GESAC, Inc

Neck Pendulum Test Setup 11/22/2018 GESAC, Inc

Neck Flexion and Extension Pulse 11/22/2018 GESAC, Inc

Neck Flexion Test Response 11/22/2018 GESAC, Inc

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

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

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

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

Individual Sensor Response 11/22/2018 GESAC, Inc

Total Sensor Response 11/22/2018 GESAC, Inc

FlexForce on Dummy Abdomen 11/22/2018 GESAC, Inc

Individual Sensor Response 11/22/2018 GESAC, Inc

Combined Sensor Response 11/22/2018 GESAC, Inc

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

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

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

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

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