American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 86)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-81 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

Retarding force in lb, due to wind resistance, lead vehicle:

FR3 = 0.0024 AV2

Retarding force in lb, due to wind resistance, trailing vehicle:

FR4 = (N-1) (0.00034AV2)

Average train resistance in lb per vehicle:

FR =[N (116 + 1.3W + 0.045VW) + 0.0024AV2 + (N-

1)0.00034AV2]/N

Symbols:

W = Vehicle weight (ton)

V = Speed (mi/hr)

A = Vehicle frontal area = 98 ft

N = Number of vehicles in train consist (2 or 6)

For use in vehicle resistance factors, the acceleration resistance due to vehicle

inertia = 100 lb/ton/mi/hr/sec.

C. Distributed Force - Calculate the forces due to train resistance and track

geometry factors as either distributed point masses located at truck centers or

as a uniformly distributed line mass.

9.4.5.2.3 Speed Limits

A. Maximum Authorized Speed - MAS is the highest ATP speed limit that can be

transmitted in a block for the purpose of enforcing civil speed limits and station

run-through speed.

B. The MAS for approach to civil speed limit zones shall not exceed the SBD profile

to achieve the speed limit at the start of the restriction using all track geometry

and train resistance factors.

C. Station run-through speed shall not exceed 45 mi/hr for an ideal train.

D. Design Profile Speed - Design profile speed is the highest speed limit to be

given in a block and is equal to MAS, except as otherwise indicated. Use the

maximum design profile speed as indicated for each station-to-station zone to

provide the least runtime even when the train may not achieve that velocity. Use

the design profile speed for control line and headway requirements.

9.4.5.2.4 Block Boundaries

A. General - Locate block boundaries to ensure compliance with safety and

headway requirements in addition to those specified herein.

B. Impedance Bond Boundaries - Utilize impedance bonds to locate block

boundaries at Insulated joints defining interlockings.

C. Speed Restriction Zone Approach - Locate a block boundary in the normal

direction of traffic on the approach to the zone with a more restrictive civil speed

limit, in order to slow a worst-case train to the more restrictive speed when

entering the zone. Locate this boundary no farther from the more restrictive

zone than the SBD necessary to slow the train to the restricted speed plus 50 ft.

D. Speed Restriction Exit - Locate a block boundary at the normal direction exit end

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 86

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