Acoustic optimisation of the rail track by targeted variation of continuous superstructure parameters along the track

Open Access

Figure 2

Clarification of the objective function approaches for optimising the TDR and the MSV according to the defined optimisation criteria. The grey area indicates the frequency ranges not considered. (a) TDR with deviation from a defined reference value. The objective function is calculated using the mean deviation within a defined frequency range. (b) Absolute value of the second degree derivative of the MSV level ( $v_{0} = 5 \cdot 1 0^{- 5} \frac{m}{s}$ ${v}_0=5\cdot 1{0}^{-5}\frac{\mathrm{m}}{\mathrm{s}}$ ). The objective function is calculated using the mean value within a defined frequency range.

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