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CLEPA presentation supporting justification of working document

Informal document No . GRB-49-08 (49th GRB, 16-18 February 2009, agenda item 4.). CLEPA presentation supporting justification of working document GRB 2008/5r1, proposing amendments to R59. Content. New driving-by test of R51 in R59 Measurement accuracy 2. Stationary noise test

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CLEPA presentation supporting justification of working document

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  1. Informal document No. GRB-49-08 (49th GRB, 16-18 February 2009, agenda item 4.) CLEPA presentation supporting justification of working document GRB 2008/5r1, proposing amendments to R59.

  2. Content • New driving-by test of R51 in R59 Measurement accuracy 2. Stationary noise test Paragraph 6.2.2.

  3. Conditions of measurement • Measurement accuracy • The current R59 regulation results in some practical inconsistensies and confusions with regard to the measurement accuracy and rounding off practice to the nearest integer dB(A) value. CLEPA proposes a simplified and uniform rule, taking into account the 1 dB(A) measurement inaccuracy.

  4. Reference noise level of vehicle type approval : Running vehicleParagraph 6.2.2.1.(a).

  5. Paragraph 6.2.2.2 (a) Back to back test : Running vehicle Tolerance 1 dB(A) after rounding off to the nearest integer

  6. 2. Justification for the CLEPA amendment proposal of the stationary noise test procedure in R59.

  7. Static noise test Deceleration vehicle 1 Prox. 50cm / 45°

  8. Static noise test Deceleration vehicle 2 Prox. 50cm / 45°

  9. Static noise test Deceleration vehicle 3 Prox. 50cm / 45°

  10. Stationary noise test • Further to the test results presented by CLEPA during last GRB, the previous graphs illustrate the poor reproducebility of the current stationary noise test. CLEPA proposes to take into account this poor reproducebility by introducing a 2 dB(A) uniform tolerance on the comparison. The current test procedure however will not be modified.

  11. Reference noise level of vehicle type approval : Stationary vehicleParagraph 6.2.2.1.(b)

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