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Code Issues 157 Wiki Activity

feat(track): vertical unevenness comes near its limit more often, with longer buckles too

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Fewer short waves: at uneven 18 the humps over 12.6 mm on the 10 m chord
go from 28 to 38 per km, with the peak still at 18 mm. Waves of 47-83 m
join them. They hardly count on that chord, the body rises and falls on
them.

The documentation tells how far unevenness goes before a pantograph
can't keep up. A wire rising fast enough trips the main breaker on a
straight track too: it does at tor0290 on Baltyk, over about 46 km/h.
This commit is contained in:
maj00r
2026-10-31 18:25:16 +01:00
parent e74bbf951f
commit 6aed9ec5bd
3 changed files with 16 additions and 8 deletions
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8
world/TrackUneven.h
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@@ -16,7 +16,7 @@ http://mozilla.org/MPL/2.0/.
#include <glm/gtc/constants.hpp>
// Track unevenness: a displacement field over the plan of the scenery, so everything at one place moves together: joined tracks, the
// paths of a switch, sleepers, axles. Waves 5-42 m long, shares after the German track spectrum with the long waves cut down.
// paths of a switch, sleepers, axles. Waves 5-42 m long, shares after the German track spectrum with the long waves cut down; up and down to 83 m.
// The "uneven" value is the peak deviation of a rail on a 10 m chord, as in PLK Id-14 appendix 1; see test_track_uneven.cpp.
namespace track_uneven {
@@ -61,7 +61,9 @@ wave_set<Count> make_waves( double const Turn, std::array<double, Count> const &
inline constexpr std::array<double, 8> wave_lengths { 5.3, 7.1, 9.7, 13.1, 17.9, 23.9, 31.7, 41.9 };
inline constexpr std::array<double, 8> wave_shares { 0.0721, 0.0997, 0.1344, 0.1703, 0.1549, 0.1386, 0.1226, 0.1074 };
inline wave_set<8> const up_waves { make_waves( 0.0, wave_lengths, wave_shares ) };
// fewer short ones than sideways: the rails come near the limit in the vertical more often, with the peak still at it.
// The long ones hardly count on the 10 m chord: the body rises and falls on them, slowly enough for a pantograph to keep up
inline wave_set<8> const up_waves { make_waves<8>( 0.0, { 8.3, 11.9, 16.7, 23.9, 37.1, 47.3, 61.9, 83.3 }, { 0.14, 0.19, 0.22, 0.22, 0.23, 0.23, 0.23, 0.23 } ) };
inline wave_set<8> const x_waves { make_waves( 1.1, wave_lengths, wave_shares ) };
inline wave_set<8> const z_waves { make_waves( 2.3, wave_lengths, wave_shares ) };
// the tilt along each axis of the plan. Long waves only: with the short ones the cross level reaching its limit would break the limit of twist
@@ -78,7 +80,7 @@ double sum( wave_set<Count> const &Waves, glm::dvec3 const &Point ) {
return total;
}
// displacement at the point for an amplitude of 1, each axis within +-1
// displacement at the point for an amplitude of 1, sideways within +-1, up and down within +-1.69
inline glm::dvec3 field( glm::dvec3 const &Point ) {
return { sum( x_waves, Point ), sum( up_waves, Point ), sum( z_waves, Point ) };