American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 49

  • Herunterladen
  • Zu meinen Handbüchern hinzufügen
  • Drucken
  • Seite
    / 191
  • Inhaltsverzeichnis
  • LESEZEICHEN
  • Bewertet. / 5. Basierend auf Kundenbewertungen
Seitenansicht 48
METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-44 Revision 4 : 05/09/12
Metro Baseline Re-Baseline: 04/29/10
CSO = Allowable exceedance of cab signal speed as detected by the carborne cab signal
system, which shall be as follows:
CSS
55
45
35
25
15
10
0
CSO
2
2
3
3
3
3
2.5
AA = An allowance to account for instantaneous acceleration of the vehicle for the time
delay between the decoding of the speed code by the carborne equipment, and removal of
propulsion power. The allowance shall also include for jerk-limited removal of power and
application of braking.
For SBD calculations, S = CSS + CST + CSO + AA
For CBD calculations, S = CSS + CST + CSO
9.4.2.2.3 Safe Braking Distance Calculation
SBD = D
r
+ D
b
+ D
o
, where:
D
r
= Reaction distance in feet = S x R x 1.467
D
b
= Braking Distance in feet = 0.733 x S
2
/ (B 0.2G)
D
o
= Overhang distance of two vehicles = 30 feet
S = Initial entry speed (mph) prior to braking.
R = Reaction time in seconds (includes operator, cab signal delays and brake build-up) =
9.8 seconds for a change in speed code and 7.2 seconds for code-to-no code.
B = Safe Braking rate = 2.0 mphps
G = Alignment grade as a decimal fraction
For safe braking calculations to bumping posts, the overhang distance of one vehicle (15
feet) can be used for distance D
o
.
9.4.2.2.4 Civil Braking Distance Calculation
CBD = D
r
+ D
b
, where:
D
r
= Reaction distance in feet = (CSS-V) x R x 1.467
D
b
= Braking Distance in feet = 0.733 x (CSS
2
-V
2
) / (B 0.2G)
CSS =Cab Signal Speed (mph) prior to braking.
V = Target speed at speed restriction
Seitenansicht 48
1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 190 191

Kommentare zu diesen Handbüchern

Keine Kommentare