[Weter]

Hello, my mates.
First, I have to say "sorry" to PGS for incorrect answer (too much time have passed, but worse - I didn't verify, before posting)
Second - my Thanks to Cesar and Ged for correcting me - I'm feeling myself delighted, having friendly backup from you.
My post is corrected now.

[darwins]

Thoughts

( 1 ) OR currently only models automatic steam driven compressors and automatic electrically driven compressors. We do not yet have either manually controlled compressors (found on some steam locos) or compressors mechanically driven by the diesel engine crankshaft.
( 2 ) It can be quite difficult to get compressor and main reservoir size information, particularly for British locos so it would be good if anyone who has relevant information could share it.
( 3 ) Related to ( 2 ) it would be good to see a few example OR files with the compressor and air brake system correctly set up using OR parameters (rather than MSTS parameters).

[Laci1959]

Hello.

My problem is that the compressors used on Hungarian railways specify the power requirement and the amount of transported air. The latter in liters per minute. The OR does not know any of the quantities, in fact the amount of transported air cannot be converted to the value of the ORTSMainResChargingRate used by the OR. Of course, many other data can also be found in the table.
I think the delivered air can be measured more quantitatively than the speed of the pressure change. In addition, the same air compressor is also used for overhead tanks of different sizes. So the rate of change of pressure can be different for the same pressure regulator.

Regards, Laci1959

[hroch]

Laci1959
Give it a try if it's what you're looking for
 rychlost kompresoru.zip (5.94K)
Number of downloads: 26

[Weter]

Quote

We do not yet have ... compressors mechanically driven by the diesel engine crankshaft.

I thought, we do (dependency on diesel's rotation speed was implemented, wasn't it?).

Quote

compressors, used on Hungarian railways specify the power requirement and the amount of transported air

Not there only; that's typycal characteristics set: power consumption (kW) and performance in L/min or m³/hour
But pressure growth will be exponent. So it seems, MSTS compressor power rating was closer to truth...or no?

[Laci1959]

hroch, on 15 March 2024 - 01:55 AM, said:

Laci1959
Give it a try if it's what you're looking for
rychlost kompresoru.zip

Hello.

Thank you very much. This excel formula is perfect.

Sincerely, Laci 1959

[pgs]

Thank you all very much for responding and allowing us to learn a little more every day.
After much reading here and other websites, the wrong .eng parameter is: AirBrakesAirCompressor PowerRating (x)
Making the substitution for:
ORTSMainResChargingRate ( x ) all issues are fixed.

hroch, on 15 March 2024 - 01:55 AM, said:

Laci1959
Give it a try if it's what you're looking for
rychlost kompresoru.zip

Very interesting to make a more realistic adjustment of the compressor load.

Weter, on 15 March 2024 - 07:01 AM, said:

I thought, we do (dependency on diesel's rotation speed was implemented, wasn't it?).

Not there only; that's typycal characteristics set: power consumption (kW) and performance in L/min or m³/hour
But pressure growth will be exponent. So it seems, MSTS compressor power rating was closer to truth...or no?

A few days ago, I found a very complete American locomotive for OR and I was doing some tests, and I think that the compressor load varied depending on the RPM of the engine.