Commission Regulation (EC) No 631/2009Show full title

2. Upper legform impactor U.K.

2.1. The upper legform impactor shall be rigid, foam-covered at the impact side, and 350 ± 5 mm long and comply with Figure 2. U.K.

The length between the load transducer centre lines shall be 310 ± 1 mm and the front member diameter shall be 50 ± 1 mm.

2.2. The torque limiting joint shall be set so that the longitudinal axis of the front member is perpendicular to the axis of the guidance system, with a tolerance of ± 2°, with the joint friction torque set to 675 ± 25 Nm. U.K.

2.3. The centre of gravity of those parts of the impactor which are effectively forward of the torque limiting joint, including any weights fitted, shall lie on the longitudinal centre line of the impactor, with a tolerance of ±10 mm. U.K.

2.4. The total mass of the upper legform impactor, including those propulsion and guidance components which are effectively part of the impactor, shall be 9,5 kg ± 0,1 kg. U.K.

The total mass of the front member and other components in front of the load transducer assemblies, together with those parts of the load transducer assemblies in front of the active elements, but excluding the foam and skin, shall be 1,95 ± 0,05 kg.

2.5. Two load transducers shall be fitted to measure the individual forces applied at either end of the upper legform impactor front member. U.K.

2.6. Three strain gauges shall be located on the impactor to measure the bending moments of the front member, as shown in Figure 2, each using a separate channel. The two outer strain gauges are located 50 ± 1 mm from the impactor's symmetrical axis. The middle strain gauge is located on the symmetrical axis with a ± 1 mm tolerance. U.K.

2.7. The instrumentation response value channel frequency class (CFC), as defined in ISO 6487:2002, shall be 180 for all transducers. The channel amplitude class (CAC) response values, as defined in ISO 6487:2002, shall be 10 kN for the force transducers and 1000 Nm for the bending moment measurements. U.K.

2.8. The upper legform impactor shall meet the certification requirements specified in Section 3 of Appendix I, and shall be fitted with foam cut from the sheet of material used for the dynamic certification test. U.K.

2.9.

For each test the foam shall be two new sheets of 25 mm thick ConforTM foam type CF-45 or equivalent. The skin shall be a 1,5 mm thick fibre reinforced rubber sheet. The foam and rubber skin together shall weigh 0,6 ± 0,1 kg (this excludes any reinforcement, mountings, etc. which are used to attach the rear edges of the rubber skin to the rear member). U.K.

The foam and rubber skin shall be folded back towards the rear, with the rubber skin attached via spacers to the rear member so that the sides of the rubber skin are held parallel.

The foam shall be of such a size and shape that an adequate gap is maintained between the foam and components behind the front member, to avoid significant load paths between the foam and these components.

2.9.1. The test impactor or at least the foam flesh shall be stored during a period of at least four hours in a controlled storage area with a stabilised humidity of 35 percent ± 15 percent and a stabilised temperature of 20 ± 4 °C prior to impactor removal for calibration. After removal from the storage the impactor shall not be subjected to conditions other than those existing in the test area. U.K.

2.9.2. Each test shall be completed within two hours of when the impactor to be used is removed from the controlled storage area. U.K.

2.10. The certified impactor may be used for a maximum of 20 impacts before re-certification (this limit does not apply to propulsion or guidance components). U.K.

The impactor shall also be re-certified if more than one year has elapsed since the previous certification or if any impactor transducer output, in any impact, has exceeded the specified CAC.

Figure 2

Upper legform impactor