RS:vehicleBrake

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vehicleBrake
 


Scheme description / Schemenbeschreibung / Description du schéma

Position of vehicleBrake in the XML-Tree / Position von vehicleBrake im XML-Baum / position de vehicleBrake dans l’aborescence XML

Multiplicity / Anzahl / Multiplicité

[1..∞]

Semantics / Bedeutung / Sémantique

The element <vehicleBrake> contains the data for each brake system or brake setting result in a particular brake effort.

Das Element <vehicleBrake> beinhaltet jeweils die Daten zu einer Fahrzeugbremse bzw. Bremsstellung, welche die Bremswirkung ergibt. Eine "Bremswirkung" wird

  • entweder durch eine Bremsmasse regularBrakeMass/emergencyBrakeMass (unphysikalischer, historisch gewachsener Ersatzwert für mittlere Bremsverzögerung)
  • oder durch einen Bremshundertstelwert autoBrakePercentage (entspricht Bremsmasse, jedoch abhängig von aktueller Beladung/Masse des Fahrzeugs)
  • oder durch eine mittlere Bremsverzögerung maxDeceleration/meanDeceleration (eigentlich richtige physikalische Werte)

repräsentiert.

Diese drei Werte-Gruppen sind also äquivalent / alternativ anzusehen; mindestens eine der drei Wertegruppen soll angegeben sein, es kann aber z. B. auch "regularBrakeMass/emergencyBrakeMass" und "maxDeceleration/meanDeceleration" angegeben sein. Letzteres ist wiederum die Vereinfachung zur Angabe von der Bremskraft (mechanicalBrakeEffort) über die Geschwindigkeit und des "bruttoWeight/nettoWeight" des Fahrzeugs (vehicle).

Attributes of vehicleBrake / Attribute von vehicleBrake / Attributs de vehicleBrake

  • brakeType: This names the type of brake producing the brake effort. According to the way of controlling the brake application one of the following values should be selected:
  • none no brake at all
  • compressedAir (pneumatic) brake system using compressed air to press the brake shoes onto the wheels or brake discs.
    "Druckluftbremse"
  • vacuum brake system using vacuum in the control pipe. The brake shoes are pressed onto the wheels by means of athmospheric air pressure.
    "Saugluftbremse"
  • handBrake manually applied brake by turning a handle or a lever which operates a gear/rod assembly with brake shoes
    "Handbremse"
  • parkingBrake mainly spring applied brake used to keep a parking vehicle stationary
    "Feststellbremse"
  • cableBrake brake applied by a cable running along the train
    "Seilzugbremse", z. B. Bauart Heberlein
  • other:anything Any value that does not fit any value from the previous enumeration list, fulfilling the constraint: at minimum two characters, whitespace is not allowed.
    brake applied by any other mechanism
  • airBrakeApplicationPosition: This is the setting for the air brake application defining the time span for activation. Possible values are:
  • N/A not applicable as brakeType is not compressedAir
  • G slow activation, typical for freight trains or Merchandises
  • P fast activation, typical for passenger trains with speed up to 120 km/h
  • R rapid activation, typical for passenger trains with higher speed
  • regularBrakeMass: This is the brake mass in metrical tons for normal brake operations of none-automatic brakes.
  • emergencyBrakeMass: This is the brake mass in metrical tons for emergency brake operations of none-automatic brakes. It differs from regular brake mass depending on auxiliary brakes.
  • maxDeceleration: This is the alternative specification of maximum possible momentary deceleration in metres per square second. Typically this value is achieved near standstill.
  • meanDeceleration: This is the alternative specification of effective mean deceleration of a whole brake operation in metres per square second.
  • loadSwitch: This gives the optional information for vehicles fitted with a load switch for adjusting brake application. Possible values are:

Missinginformation.png In this article there is information missing with respect to the semantics of the enumeration items. Please help improving the railML® wiki by filling the gaps. Possibly, you will find further details on the discussion pageFerri Leberl (talk) 16:06, 25 April 2018 (CEST)
  • full
  • empty
  • autoBrakePercentage: This gives the automatically regulated brake percentages depending on actual load of vehicle. The brake percentage is the ratio between the mass a vehicle can decelerate from a given speed to standstill within a given distance and the vehicle mass including payload multiplied with 100.
    "Bremshundertstel" (external link, German flag.png)]
  • maxAutoBrakeMass: This is the maximum brake mass of the automatic brake in metric tons.

Syntactic Constraints / Syntaktische Beschränkungen / Contraintes syntactiques

  • maxDeceleration: xs:decimal, 3 fraction digits, acceleration value measured in m/s², optional
  • meanDeceleration: xs:decimal, 3 fraction digits, acceleration value measured in m/s², optional
  • loadSwitch optional
  • autoBrakePercentage xs:integer, within the range of 6 and 225, brake percentage as value of braking performance in relation to vehicle weight, optional

An unlimited number of <vehicleBrake> can be used. However, there is at least one such element mandatory, if its parent <vehicleBrakes> is used.

Best practice & Examples / Empfohlene Anwendung & Beispiele / Bonnes pratiques & exemples

An engine with several brake application positions:

<vehicle id='veh_ME26' axleSequence='Co&apos;Co&apos; de' numberDrivenAxles='6' length='20.960' speed='160' bruttoWeight='122' nettoAdhesionWeight='122'>
  <vehicleBrakes>
    <vehicleBrake brakeType='parkingBrake' regularBrakeMass='24'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='G'
			regularBrakeMass='103'
			emergencyBrakeMass='103'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='P'
			regularBrakeMass='129'
			emergencyBrakeMass='129'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='R'
			regularBrakeMass='154'
			emergencyBrakeMass='154'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='R'
			regularBrakeMass='215'
			emergencyBrakeMass='215'>
      <auxiliaryBrakes brakeUse='both' E='true'/>
    <vehicleBrake/>
  </vehicleBrakes>
</vehicle>

A carriage with several brake application positions:

<vehicle id='veh_DABpza785.2' name='DABpza785.2' numberNonDrivenAxles='4' track-Gauge='1.435' length='26.800' speed='160' bruttoWeight='55.000' net-toWeight='49.000'>
  <wagon>
    <passenger>
      <places category='class1' count='5'/>
      <places category='class2' count='89'/>
    </passenger>
  </wagon>
  <vehicleBrakes>
    <vehicleBrake brakeType='parkingBrake' regularBrakeMass='5'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='P'
			regularBrakeMass='68'
			emergencyBrakeMass='68'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='R'
			regularBrakeMass='89'
			emergencyBrakeMass='89'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='R'
			regularBrakeMass='95'
			emergencyBrakeMass='95'/>
      <auxiliaryBrakes brakeUse='both' ep='true'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='R'
			regularBrakeMass='95'
			emergencyBrakeMass='127'>
      <auxiliaryBrakes brakeUse='both' ep='true'/>
      <auxiliaryBrakes brakeUse='emergency' Mg='true'/>
    <vehicleBrake/>
  </vehicleBrakes>
</vehicle>

A freight wagon with automatic brake ("2 KE-GP-A", brake mass max. 92 t, own mass 34.8 t):

<vehicle id='veh_Sdggmrs31' name='Sdggmrs31' numberNonDrivenAxles='6' trackGauge='1.435' length='34.200' speed='120' bruttoWeight='135.000' nettoWeight='34.800'>
  <wagon kinematicEnvelope='UIC.EN15273'/>
  <vehicleBrakes>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='G'
			maxAutoBrakeMass='92'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='P'
			maxAutoBrakeMass='92'/>
  </vehicleBrakes>
</vehicle>

A freight wagon with "traditional" (non-automatic) brake with load-switch:

<vehicle id='veh_Sfins1' name='Sfins1' numberNonDrivenAxles='4' trackGauge='1.435' length='20.760' speed='120' bruttoWeight='90.000' nettoWeight='26.000'>
  <wagon kinematicEnvelope='UIC.EN15273'/>
  <vehicleBrakes>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='P'
			regularBrakeMass='31'
			emergencyBrakeMass='31'
			laodSwitch='empty'/>
    <vehicleBrake brakeType='compressedAir'
			airBrakeApplicationPosition='P'
			regularBrakeMass='59'
			emergencyBrakeMass='59'
			laodSwitch='full'/>
  </vehicleBrakes>
</vehicle>

A vehicle with vacuum and cable brake (Kö/Hb):

<vehicle id='veh_IVK' name='DRG.99.15-16' axleSequence='B&apos;B&apos; n4vt' numberDrivenAxles='4' trackGauge='0.750' numberNonDrivenAxles='0' length='9.000' speed='30' bruttoWeight='29.600' nettoAdhesionWeight='26.500'>
  <vehicleBrakes>
    <vehicleBrake brakeType='vacuum'
			regularBrakeMass='7.8'
			emergencyBrakeMass='7.8'/>
    <vehicleBrake brakeType='cableBrake'
			regularBrakeMass='7'
			emergencyBrakeMass='7'/>
  </vehicleBrakes>
</vehicle>

Notes / Anmerkungen / Notes

Ein Fahrzeug hat in der Regel mehrere Bremswirkungen, weil

  1. mehrere unabhängige Bremssysteme eingebaut sind und/oder
  2. ein Bremssystem mehrere "Betriebsarten" ("Bremsstellungen") haben kann.

Dabei wird es bei den meisten heutigen Eisenbahnfahrzeugen darauf hinauslaufen, dass mehrere Bremsstellungen aus dem Sammelsurium [G, P, R, P+Mg, R+Mg, P+E, R+E, P+H, R+H...] angegeben sind. Es kann aber auch Wagen geben (und die gibt es wirklich!), die mehrere Bremssystembauformen haben, also Druckluftbremse und Saugluftbremse oder Druckluftbremse und Seilbremse oder so. Je nachdem, was das Triebfahrzeug hat, ist dann entweder die eine oder die andere Bremsbauform benutzt. Außerdem hat jedes Fahrzeug noch eine Handbremse / Feststellbremse, die hier als eigene Bremsbauform zu betrachten ist und daher als eigene Instanz von <vehicleBrake> angegeben werden soll.

Open issues / Offene Punkte/Pedenzen / Questions ouvertes

Not yet described. / Noch nicht beschrieben. / Pas encore décrit.