Document ID: chunk:federal_register_of_legislation:F2025L00028:reg:3:p1
Version: federal_register_of_legislation:F2025L00028
Segment Type: reg
Provision Reference: reg 3 (pt 1/11)
Character Range: 122267–125164

3              459                36.0                  40.0

5.10. Lumbar spine
5.10.1. The lumbar spine is mounted to the special certification head-form with a mass of 3.9 ± 0.05 kg (see Figure 6), with the help of a 12 mm thick interface plate with a mass of 0.205 ± 0.05 kg.
5.10.2. The head-form and lumbar spine are mounted upside-down to the bottom of a neck-pendulum[5] allowing a lateral motion of the system.
5.10.3. The neck-pendulum is equipped with an uni-axial accelerometer according to the neck-pendulum specification (see Figure 5).
5.10.4. The neck-pendulum should be allowed to fall freely from a height chosen to achieve an impact velocity of 6.05 ± 0.1 m/s measured at the pendulum accelerometer location.
5.10.5. The neck-pendulum is decelerated from impact velocity to zero by an appropriate device,[6] as described in the neck pendulum specification (see Figure 5), resulting in a velocity change - time history inside the corridor specified in Figure 8 and Table 6 of this annex. All channels have to be recorded according to the ISO 6487-2000 or SAE J211 (March 1995) data channel recording specification and filtered digitally using ISO 6487:2000 CFC 180 or SAE J211:1995 CFC 180. The pendulum deceleration has to be filtered using ISO 6487:2000 CFC 60 or SAE J211:1995 CFC 60.

       Table 6
       Pendulum Velocity Change - Time Corridor for Lumbar Spine Certification Test

Upper boundary                  Lower boundary
time [s]        Velocity [m/s]  time [s]        Velocity [m/s]
0.001           0.0             0               -0.05

0.0037          -0.2397         0.0027          -0.425

0.027           -5.8            0.0245          -6.5

                                0.03            -6.5

 The maximum head-form flexion angle relative to the pendulum
(Angle dθA + dθC in Figure 6)) should be between and including 45.0 and 55.0° and should occur between and including 39.0 and 53.0 m/s.
5.10.7.  The maximum head-form centre of gravity displacements measured in angle dθA and dθB (see Figure 6) should be: Fore pendulum base angle dθA between and including 31.0 and 35.0° occurring between and including 44.0 and 52.0 m/s and aft pendulum base angle dθB between and including 0.8*(angle dθA) + 2.00 and 0.8* (angle dθA) + 4.50° occurring between and including 44.0 and 52.0 m/s.
5.10.8. The performance of the lumbar spine can be adjusted by changing tension in the spine cable.
5.11. Abdomen
5.11.1. The dummy is seated on a flat, horizontal, rigid surface with no back support. The thorax is positioned vertically, while the arms and legs are positioned horizontally.
5.11.2.  The impactor is a pendulum with a mass of 23.4 ± 0.2 kg and diameter of 152.4 ± 0.25 mm with an edge radius of 12.7 mm.[7] The impactor is suspended from rigid hinges by eight wires with the centre line of the impactor at least 3.5 m below the rigid hinges (see Figure