The rolling noise calculations each generate a collection of output files, which are used in plotting data in Train Noise Expert, and also as input data for external noise calculations. Some of this data may be of interest to users, and a description of the data contents for some of the most useful files is provided here.
The following files can be found in: [ProjectFolder]/Results/[Date]/Rolling/[Situation]/[Wheelset]
Sound power results are provided for a single wheel, and in the case of rail/sleeper, this is evaluated over the median Vehicle length in the Situation.
n.b. Files with a ‘_1’ suffix indicate that they contain values for unit roughness (dB re 10-6m), but otherwise have the same structure as the corresponding file without the ‘_1’ suffix.
| File: | roll_total_SWL.csv |
|---|---|
| Description: | Total rolling sound power level, in dB re 10-12W. |
| Data: | Column 1: 1⁄3 octave frequency bands (Hz) Column 2: total power |
| File: | roll_wheel_SWL.csv |
|---|---|
| Description: | Sound power levels from the wheel, in dB re 10-12W. |
| Data: | Column 1: 1⁄3 octave frequency bands (Hz) Column 2: total power Column 3: power from axial motion Column 4: power from radial motion Column 5: power from torsional motion |
| File: | roll_rail_SWL.csv |
|---|---|
| Description: | Sound power levels from the rail, in dB re 10-12W. |
| Data: | Column 1: 1⁄3 octave frequency bands (Hz) Column 2: total power Column 3: power from vertical propagating wave Column 4: power from vertical decaying wave Column 5: power from lateral propagating wave Column 6: power from lateral decaying wave |
| File: | roll_sleeper_SWL.csv |
|---|---|
| Description: | Sound power levels from the sleeper, in dB re 10-12W. (This is for vertical excitation only.) |
| Data: | Column 1: 1⁄3 octave frequency bands (Hz) Column 2: total power |
The following files can be found in: [ProjectFolder]/Results/[Date]/Rolling/[Situation]/[Wheelset]/[Receiver]
Sound pressure results are provided on the basis of the median number of Wheelsets of that type per Vehicle in the Situation, and is evaluated over the median Vehicle length.
Whether the sound pressure includes sound from the left side only or from both sides, is dependent on your Situation settings.
| File: | roll_total.csv |
|---|---|
| Description: | Total rolling sound pressure level, in dB re 2x10-5Pa. |
| Data: | Column 1: 1⁄3 octave frequency bands (Hz) Column 2: total sound pressure level |
| File: | roll_wheel.csv |
|---|---|
| Description: | Sound pressure levels from the wheel(s), in dB re 2x10-5Pa. |
| Data: | Column 1: 1⁄3 octave frequency bands (Hz) Column 2: sound pressure level |
| File: | roll_rail.csv |
|---|---|
| Description: | Sound pressure levels from the rail(s), in dB re 2x10-5Pa. |
| Data: | Column 1: 1⁄3 octave frequency bands (Hz) Column 2: sound pressure level |
| File: | roll_sleep.csv |
|---|---|
| Description: | Sound pressure levels from the sleepers, in dB re 2x10-5Pa. |
| Data: | Column 1: 1⁄3 octave frequency bands (Hz) Column 2: sound pressure level |
The following files can be found in: [ProjectFolder]/Results/[Date]/Rolling/[Situation]/[Wheelset]
| File: | roll_wfrs.csv |
|---|---|
| Description: | Wheel mobility, in m/s/N. These are provided as complex numbers. |
| Data: | Column 1: frequencies (Hz) Column 2: vertical mobility Column 3: cross mobility Column 4: lateral mobility |
| File: | roll_cfrs.csv |
|---|---|
| Description: | Contact mobility, in m/s/N. These are provided as complex numbers. |
| Data: | Column 1: frequencies (Hz) Column 2: vertical mobility Column 3: lateral mobility |
| File: | roll_rfrs.csv |
|---|---|
| Description: | Rail mobility, in m/s/N. These are provided as complex numbers. |
| Data: | Column 1: frequencies (Hz) Column 2: vertical mobility Column 3: cross mobility Column 4: lateral mobility |
| File: | roll_contactFilter.csv |
|---|---|
| Description: | The contact filter used in the calculations, in dB. |
| Data: | Column 1: 1⁄3 octave frequency bands (Hz) Column 2: contact filter |
| File: | roll_TDRcalc.csv |
|---|---|
| Description: | The calculated track decay rate, in dB/m. (Calculated from track parameters.) |
| Data: | Column 1: frequency (Hz) Column 2: vertical TDR Column 3: lateral TDR |
| File: | roll_rail_vib.csv |
|---|---|
| Description: | The rail velocity response, in m/s. |
| Data: | Column 1: frequency (Hz) Column 2: vertical velocity Column 3: lateral velocity |
| File: | roll_sleeper_vib.csv |
|---|---|
| Description: | The sleeper velocity response, in m/s. |
| Data: | Column 1: frequency (Hz) Column 2: vertical velocity |