Method for determining short-wave track geometry and rail subsidence under load

摘要

A method for distortion-free separation form faithful track geometry in short-wave and long-wave components without loss of information, a locally equidistant, true to form, vertical track position signal in a short-wave component corresponding to the geometry without load, and a long-wave component, corresponding to the depression of the rail under load with long-wave track deviations decomposed and for the distortion-free separation filter in the local area are used and in the first step, a filter is designed with known filter design techniques, characterized in that the characteristic filter cutoff frequency and the filter slope are previously determined from the measured track signals containing long-wave and short-wave track deviations, this is preferably carried out by means of spectral analyzes in the local frequency range and depending on the selected filter type, as well as the phase response of the filter, the distribution of ortsäquidistan When using a linear phase-locked FIR filter, the second filter also has linear phase response and the same filter order as the first filter and is calculated from the filter coefficients of the first filter and by using the two filters locally equidistant, true to form, vertical track position signal without loss of information in a short-wave and a long-wave component is divided or when using a FIR filter with non-linear phase response or IIR filter for the distortion-free separation of the equidistant, faithful, vertical track position signal in a short-wave and a long-wave component the track position signal is filtered and a phase distortion is completely compensated by a second filtering with the same filter and reverse signal order, the characteristic filter cutoff frequency and the filter slope previously from the measured track position design which are preferably carried out by means of spectral analyzes in the local frequency range and, depending on the choice of the filter, the long-wave or short-wave component of the track position signal is determined, the associated second short-wave or long-wave Proportion is determined by subtracting the double filtered track signal from the original track.