NPACS Dummy Design

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NPACS Dummy Design
N. Rangarajan, B. Seck GESAC, Inc H.
Goerlitz Stiftung Warentest S. Kerbl ÖAMTC
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Presentation Outline

• Project organisation
• Project objectives
• Design of small 3-year old dummy

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Project Organisation
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Project Organisation

• Project sponsored by NPACS committee
• Development contract monitored by ÖAMTC
• Funded by customers

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Project Objectives
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Project Objectives

• NPACS needs to develop a unique and consistent
  methodology to test and report on child
  restraints
• The prototypes initially designed by Kiel
  university need improvement in mass, and
  manageability
• Henry, Stefan please put in a couple of slides
  here

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Project Objectives

• Design six sizes of child manikins for evaluating
  and testing child restraint systems
• Meet European anthropometric shape requirements
  for each size

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Project Objectives

• Deliver small 3-year old dummy in December, 2006
  for comments by customers
• Customer evaluation to be coordinated by ÖAMTC
• Deliver all other dummies by 1st quarter, 2007

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Dummy Sizes
Age Group Body Height (mm) Body Weight (Kg)
12 Year old 1500 25
6 year old 1265 20
3 year old (big) 1085 18
3 year old (small) 850 15
1.5 year old 900 13
18 month old 708 9
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Family Photo
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Design Requirements

• Use commercially available, standard fasteners
• Design scalable dummies
• Allow for simple assembly and disassembly
• Dummies should be robust and easy to handle

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Design Requirements

• Dummies to have anthropometrically correct shapes
  and masses, including segment masses
• Dummies to have human-like range of motion
• Weight of the 150 cm dummy to be limited to 20 kg

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Design Requirements

• Allow for simple assembly and disassembly
• Dummies should be robust and easy to handle

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Design of small 3-year old dummy
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Sources of Data

1. Biomechanical bases for CRABI and Hybrid III
   child dummies. 41st Stapp conference.
2. Anthropometry of US infants and children. SAE
   publication SP 394.

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Small 3 Year Old Dummy anthropometry
Item Target Measured Source
Body Ht mm 935 935.3 Kiel data
Wt kg 15 15.1 NPACS
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Small 3 Year Old Dummy anthropometry - Head
Item Target Measured Source
Circum. 470 471 H-3 scaled
Height N/A 173
Breadth N/A 125
Depth N/A 164 NPACS
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Small 3 Year Old Dummy anthropometry - Torso
Item Target Measured Source
Hor. Dist Shldr Jts 182 182 Kiel data
Hor. Dist Hip jt 100 100 Kiel
Vert. Shldr-Hip jt 290 290 Kiel
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Small 3 Year Old Dummy anthropometry - Torso
Item Target Measured Source
Chest depth 115 123 Scaled H-3
Chest breadth 150 148 Scaled H-3
Waist breadth 178 180 "
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Small 3 Year Old Dummy anthropometry - Torso
Item Target Measured Source
Waist Circ. 547 566 Scaled H-3
Hip Circ. 500 518 Scaled H-3
Hip breadth 180 178 "
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Small 3 Year Old Dummy anthropometry - Legs
Item Target Measured Source
Upr leg length 200 200 Kiel
Lwr leg length 230 230 Kiel
Hip breadth 180 192 "
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Small 3 Year Old Dummy anthropometry - Arms
Item Target Measured Source
Upr arm length 150 150 Kiel
Lwr arm length 230 230 Kiel
Upr arm circ. 150 150 "
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Small 3 Year Old Dummy anthropometry - Arms
Item Target Measured Source
Lwr arm circ. 140 137 Kiel
Hand length 90 92 Kiel
Hand breadth 55 56 "
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Small 3 Year Old Dummy Range of Motion
Item Value
Knee ROM 125 Deg
Elbow ROM 120 Deg
Hip abduction 25
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Assembled Dummy
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Skeletal Assembly
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Material Specifications

• Vinyl and foam flesh.
• Flesh feels human like.
• Skeleton fabricated out of commercially available
  parts.

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Degrees of Freedom at Major Joints
3

• Shoulder joint (3 degrees of
  freedom).
• Hinge abduction, adduction.
• Pivot flexion, extension.
• Pivot lateral and medial rotations.

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2
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Degrees of Freedom at Major Joints (Continued)

• Knee and elbow joints (1 degree of freedom).
• Hinge flexion, extension.

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Degrees of Freedom at Major Joints (Continued)

• Hip joint (2 degrees of
  freedom).
• Hinge abduction, adduction.
• Pivot flexion, extension.

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2
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Head Insert
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Cervical Spine Assembly
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Clavicle shoulder assembly
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Shoulder Assembly
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Thoracic Spine Assembly
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Pelvis Assembly
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Hip Joint Assembly
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Shoulder Lateral and Medial Rotation Capability
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Shoulder Lateral and Medial Rotation Capability
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Upper Arm Bone Assembly