Document ID: chunk:federal_register_of_legislation:F2025L00028:front:0:p32
Version: federal_register_of_legislation:F2025L00028
Segment Type: other
Provision Reference: 
Character Range: 90012–93442

be used.

              6.2. Propulsion of the mobile deformable barrier

               At the moment of impact the mobile deformable barrier shall no longer be subject to the action of any additional steering or propelling device. It shall reach the obstacle on a course perpendicular to the front surface of the dynamometric wall. Impact alignment shall be accurate to within 10 mm.

              6.3. Measuring instruments

              6.3.1. Speed

               The impact speed shall be 35  0.5 km/h the instrument used to record the speed on impact shall be accurate to within 0.1 per cent.

              6.3.2. Loads

               Measuring instruments shall meet the specifications set forth in ISO 6487:1987

                CFC for all blocks:   60 Hz

                CAC for blocks 1 and 3: 200 kN

                CAC for blocks 4, 5 and 6: 100 kN

                CAC for block 2: 200 kN

              6.3.3.               Acceleration

              6.3.3.1.               The acceleration in the longitudinal direction shall be measured at three separate positions on the trolley, one centrally and one at each side, at places not subject to bending.

              6.3.3.2.  The central accelerometer shall be located within 500 mm of the location of the centre of gravity of the MDB and shall lie in a vertical longitudinal plane which is within ±10 mm of the centre of gravity of the MDB.

              6.3.3.3.               The side accelerometers shall be at the same height as each other ±10 mm and at the same distance from the front surface of the MDB ±20 mm

              6.3.3.4.               The instrumentation shall comply with ISO 6487:1987 with the following specifications:

                CFC 1,000 Hz (before integration)

                CAC 50 g

              6.4.               General specifications of barrier

              6.4.1. The individual characteristics of each barrier shall comply with paragraph 1. of this annex and shall be recorded.

              6.5. General specifications of the impactor

              6.5.1. The suitability of an impactor as regards the dynamic test requirements shall be confirmed when the outputs from the six load cell plates each produce signals complying with the requirements indicated in this annex.

              6.5.2. Impactors shall carry consecutive serial numbers which are stamped, etched or otherwise permanently attached, from which the batches for the individual blocks and the date of manufacture can be established.

              6.6.               Data processing procedure

              6.6.1.               Raw data: At time T = T0, all offsets should be removed from the data. The method by which offsets are removed shall be recorded in the test report.

              6.6.2.               Filtering

              6.6.2.1.               The raw data will be filtered prior to processing/calculations.

              6.6.2.2.               Accelerometer data for integration will be filtered to CFC 180, ISO 6487:1987.

              6.6.2.3.               Accelerometer data for impulse calculations will be filtered to CFC 60, ISO 6487:1987.

              6.6.2.4.               Load cell data will be filtered to CFC 60, ISO 6487:1987.

              6.6.3.               Calculation of MDB face deflection

              6.6.3.1.               Accelerometer data from all three accelerometers individually