Division 4.2.8.3 Calculation of the adjusted average peak braking force coefficientF1
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The average peak braking force coefficient of the reference tyre used for the calculation of its braking force coefficient is adjusted according to the positioning of each candidate tyre in a given test cycle.
This adjusted average peak braking force coefficient of the reference tyre ( Ra ) is calculated in accordance with table 3 where R 1 is the average peak tyre braking coefficient in the first test of the reference tyre (R) and R 2 is the average peak tyre braking coefficient in the second test of the same reference tyre (R).
Table 3
| Number of candidate tyre(s) within one test cycle | Candidate tyre | Ra |
|---|---|---|
| 1 ( R 1 -T1- R 2 ) | T1 | Ra = 1/2 ( R 1 + R 2 ) |
| 2 ( R 1 -T1-T2- R 2 ) | T1 | Ra = 2/3 R 1 + 1/3 R 2 |
| T2 | Ra = 1/3 R 1 + 2/3 R 2 | |
| 3 ( R 1 -T1-T2-T3- R 2 ) | T1 | Ra = 3/4 R 1 + 1/4 R 2 |
| T2 | Ra = 1/2 ( R 1 + R 2 ) | |
| T3 | Ra = 1/4 R 1 + 3/4 R 2 |