This section provides description for some common terms that will be used throughout the document
H Point: The theoretical location of the occupant’s hip. This is the pivot point of both the torso and the upper leg. Many dimensions will be relative to this.
5 Point / 6 Point Harness: A seatbelt with 5 or 6 belts in total. It restrains the movement of the occupant more than a 3 Point Seatbelt and is safer
5 Point Harness
1 & 2: Shoulder Belts
3 & 4: Lab Lap Belts
5: Anti Sub Belt
6 Point Harness
Similar setup to 5 Point Harness however Antisub Belt is two separate belts
Passthroughs: Cutouts in the seat to allow the belts of a 5 or 6 Point Harness to pass through the seat uninterrupted (as shown by the red circles in the image below)
Seatback: The portion of the seat which supports the back and shoulders of the occupant
Headrest: The portion of the seat which supports the head and/or neck of the occupant
In race/bucket seats this will be the area above the shoulder belt passthroughs
Seatpan: The portion of the seat which supports the buttock and upper leg of the occupant
Bolsters: Protrusions/barriers typically found on the seatback or seatpan of the seat (shown by the red circles in the image below) They keep the occupant centered in the seat during cornering.
Undepressed Seat Contour: The shape of the seat cushioning (typically viewed from the side) when no occupant has sat in it
Depressed Seat Contour: The shape of the seat cushioning (typically viewed from the side) when an occupant is sitting in the seat - causing the cushioning to compress
ILD/IFD: Acronym for Indentation Load Deflection or Indentation Force Deflection. A test to determine the stiffness of a foam. Manufacturers will typically specify the stiffness of their foam in ILD/IFD
In this test a circular flat indenter is pressed against a foam sample of standardized width, length and height. 60 seconds after the indenter has achieved 25% or 50% compression, the force is measuredÂ
Higher ILD/IFD values = stiffer foam
25% ILD/IFD is for a 25% compression
50% ILD/IFD is for a 50% compression
US measurements are in pound-force
European measurements are in newtons
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Temperature Regulation [6]
If bare skin will be touching the cover material, the material should not go above33°C +/- 1.4°C during operation
Minimum surface heat flux of cover material: 75W/m^2
Perforating the cover material in specific areas can greatly increase its surface heat flux value
