Neck assembly for anthropomorphic test device
A neck assembly for an anthropomorphic test device (ATD) includes a plurality of vertebra discs, a plurality of ligament joints each having a joint element disposed between the vertebra discs, and a torsion assembly coupled to one of the vertebra discs to allow rotation about an axis of the one of the vertebra discs to simulate torsion response of a human neck.
1. A neck assembly for an anthropomorphic test device (ATD) comprising:
a plurality of vertebra discs; and
a joint element disposed between each respective pair of said vertebra discs; and
a torsion assembly including:
a bottom member coupled to one of said vertebra discs and having a protrusion;
a top member cooperating with and rotatable relative to said bottom member to allow rotation about an axis of said one of said vertebra discs to simulate torsion response of a human neck, and
a torsion element disposed between said bottom member and said top member, wherein said torsion element includes:
a first ring portion disposed about said protrusion of said bottom member, and
a second ring portion interconnected to and spaced radially from said first ring portion.
2. A neck assembly as set forth in claim 1 , wherein said first and second ring portions are interconnected by a plurality of spoke portions spaced circumferentially and extending radially between said first ring portion and said second ring portion.
3. A neck assembly as set forth in claim 1 , wherein said torsion assembly further includes a plurality of rollers disposed between said bottom and top member.
4. A neck assembly as set forth in claim 1 ,
wherein each of said bottom member and said top member have a cavity extending respectively axially therein,
wherein said bottom member includes a groove extending axially therein and circumferentially thereabout a bottom of said cavity of said bottom member to form a bottom race,
wherein said top member includes a groove extending axially therein and circumferentially thereabout a top of said cavity of said top member to form a top race, and
wherein said torsion assembly includes a plurality of rollers disposed in said bottom race and said top race between said bottom member and said top member.
5. A neck assembly as set forth in claim 1 , wherein said first ring portion is bonded to said bottom member.
6. A neck assembly as set forth in claim 1 , wherein said first ring portion is bonded to said protrusion.
7. A neck assembly as set forth in claim 1 , wherein said torsion element is coupled to said top member by a plurality of pins.
8. A neck assembly as set forth in claim 1 , wherein said torsion assembly further includes a plurality of torsion stops to limit a range of rotation of said neck assembly.
9. A neck assembly as set forth in claim 8 , wherein said range of rotation is up to approximately fifty (50) degrees.
10. A neck assembly as set forth in claim 1 , wherein said torsion element is made of a flexible material.
11. An anthropomorphic test device (ATD) comprising:
a body;
a neck assembly connected to said body, said neck assembly comprising:
a plurality of vertebra discs; and
a joint element disposed between each respective pair of said vertebra discs; and
a torsion assembly including:
a bottom member coupled to one of said vertebra discs and having a protrusion;
a top member cooperating with and rotatable relative to said bottom member to allow rotation about an axis of said one of said vertebra discs to simulate torsion response of a human neck, and
a torsion element disposed between said bottom member and said top member, wherein said torsion element includes:
a first ring portion disposed about said protrusion of said bottom member, and
a second ring portion interconnected to and spaced radially from said first ring portion.
12. An anthropomorphic test device (ATD) as set forth in claim 11 , wherein said first and second ring portions are interconnected by a plurality of spoke portions spaced circumferentially and extending radially between said first ring portion and said second ring portion.
13. An anthropomorphic test device (ATD) as set forth in claim 11 , wherein said torsion assembly further includes a plurality of rollers disposed between said bottom and top member.
14. An anthropomorphic test device (ATD) as set forth in claim 11 ,
wherein each of said bottom member and said top member have a cavity extending respectively axially therein,
wherein said bottom member includes a groove extending axially therein and circumferentially thereabout a bottom of said cavity of said bottom member to form a bottom race,
wherein said top member includes a groove extending axially therein and circumferentially thereabout a top of said cavity of said top member to form a top race, and
wherein said torsion assembly includes a plurality of rollers disposed in said bottom race and said top race between said bottom member and said top member.
15. An anthropomorphic test device (ATD) as set forth in claim 11 , wherein said first ring portion is bonded to said bottom member.
16. An anthropomorphic test device (ATD) as set forth in claim 11 , wherein said first ring portion is bonded to said protrusion.
17. An anthropomorphic test device (ATD) as set forth in claim 11 , wherein said torsion element is coupled to said top member by a plurality of pins.
18. An anthropomorphic test device (ATD) as set forth in claim 11 , wherein said torsion assembly further includes a plurality of torsion stops to limit a range of rotation of said neck assembly.
19. An anthropomorphic test device (ATD) as set forth in claim 18 , wherein said range of rotation is up to approximately fifty (50) degrees.
20. A neck assembly as set forth in claim 11 , wherein said torsion element is made of a flexible material.