Performance-Based Track Geometry, Phase 1 (2012) / Chapter Skim
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6 3.0 VEHICLE CHARACTERIZATION AND ON-TRACK TESTS All testing was performed on DART property located in Dallas, Texas. DART's operating conditions provided a variety of track structures and a wide range of operating speeds.
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7 DART's Super Light Rail Vehicle (SLRV) was used for testing.
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8 3.1 Vehicle Characterization Tests TTCI has often found that actual vehicle characteristics as assembled can vary considerably from the published design and measured individual components. In order to ensure an accurate NUCARS model of the DART SLRV, tests were conducted to measure suspension characteristics and carbody inertial and resonance characteristics.
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9 Bounce (All bodies in phase) Upper and Lower Center Roll (All Bodies in Phase)
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10 Figure 4. Location of Carbody Resonance Test Instrumentation (plan view)
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11 Figure 5. Using a Crowbar to Excite Carbody Yaw Vibration Mode 3.1.2 Bogie Resonance Bogie and primary suspension resonance tests were performed using a load cell hammer and accelerometers placed on the bogie frame.
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12 Figure 6. Hammer Test and SLRV Motor Truck Figure 7.
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13 3.1.3 Suspension Stiffness In the suspension stiffness test, the longitudinal, lateral, and vertical stiffnesses of the primary and secondary suspension were measured. A force was applied across the suspension.
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14 The vertical suspension was measured utilizing the lifts at DART. Load cells were placed under the wheels of the truck being measured.
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15 3.2 Track Inspection and Track Geometry Measurements A track inspection was done on the DART Red Line. Miniprof™5 Figures 11 and 12 show examples of Miniprof profiles taken in a curve and on tangent track.
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16 Figure 11b. Curve Rail Profiles Low Rail Figure 12.
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17 Figure 13. Track Geometry Issues Track geometry measurements were taken by Holland August 13 and 14, 2010, on DART Red Line in both directions.
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18 Figure 14. Holland's TrackSTAR Vehicle The data provided by Holland was in space curve format.
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19 Figure 16. Required Track Geometry Information 3.3 Ride Quality Test A ride quality test was conducted on DART's Red Line.
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20 Figure 17. Ride Quality Instrumentation Figure 18.
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