AS NZS 3629.11:2013 – Methods of testing child restraints Method 11: Measuring energy attenuation
AS NZS 3629.11:2013 – Methods of testing child restraints Method 11: Measuring energy attenuation.
6 VERIFICATION OF TEST APPARATUS
The velocity of impact shall no differ by more than 3% from the velocity of impac theoretically obtainable in free fall in vacuum, within 50 mm of the point of impact from the specified drop height.
NOTE: Increasing the drop height abosc the tolerance specified in the product Standard is not acceptable.
7 TEST SPECIMEN
The following apply:
(a) The test specimen shall not have been previously tested and sampled from a
Ib) The child restraint shall be sectioned ensuring to maintain the structural integrity of the head restraint or side wing within the region of the test site, in accordance with Clause X(b)(k).
This test method is based on testing helmets as the helmet test methods may assist in conducting this test procedure.
The procedure shall be as follows:
(a) Determination of test sites:
(i) Position the child restraint on the test seat as specified in Clause 7(a) of AS/NZS 3629.1:2013 and shown in Figure 1 of ASINZS 3629.1:2013.
(ii) Select the largest appropriate test dummy, specified in the requirements of ASINZS 1754:2013, Table 5.1, Sideways with door, for dynamic testing. Record the test dummy selected.
‘iii) Install the child restraint on the test seat, as specified in the manufacturer’s instructions, and correctly position the appropriate test dummy into the restraint.
(iv) Move the test dummy’s head in the direction of a Q0 sideways impact and determine the contact between the head and head restraint and mark the centre of the position of the head to create the impact point.
NOTh: If the eNact location cannot bc determined the laboratory may estimate the contact site.
(b) Impact energy attenuation:
(I) Position the headiorni such that the impact point with the test site corresponds within a 15 mm radius from the intersection of the mid sagittal and transverse planes at the crown of the headform. See Figure 3.
(ii) Using the test headform and drop assembly, verify that the apparatus functions in accordance with Clause 6.
(iii) Ensure that the laboratory conditions are as specified in AS[NZS 2512.2.
(iv) Prepare the child restraint so that the headform can strike the surface required. This will mean removing the opposite side structure, in sectioning the child restraint, as much as possible of the backrest shall remain unmodified.
(v) Position the specimen on the test anvil in a position where the back of the structure sits on the anvil and the headform aligns with the dummy’s head position identified in Step )a)(iv). Secure the sectioned child restraint so that it is stable preventing it from moving during the set-up and dropping of the hcadlorm. Tape or EPS supports may bc used Ia secure thy sectioned test specimen in place, bLit shall not interfere with the drop assembly Figure 3 shows esamples of positioning the test specimen on the test anvil and shows the alignment of the head form in order to contact the impact location determined in Step X(aKiv).
(vi) Raise the lowest part of the hcadform to a height of 1500 3O, —5 mm from the upper surface of the side of the specimen that the headform rested on in Step (aNiv).
(vii) Drop the headform and ensure the strike is not atTeclcd by the hack of the specimen
(viii) Measure the headform acceleration at intervals specified in ASNZS 1754.
For child restraints incorporating more than one type designation, repeat Steps (a) and (b) for each type designation.
The report shall include the following:
(a) Identity of the child restraint under test.
)b) lleadfimi acceleration.
(c) A reference to this test method. i.e. ASINZS 3629.11.