Bogie & Car Characterization, Vibration and Fatigue System
Apply real or simulated rail car forces and moments to assembled bogies and complete rail cars to measure stiffness, moments of inertia and damping with exceptional precision and accuracy. The broad range of data generated by this high capacity, multi-purpose performance measurement system enables manufacturers to improve the reliability of advanced computer models.
Applications
Primary and secondary suspension stiffness and damping
Incorporates advanced sensors and instrumentation mounted directly at the specimen interface for extremely precise measurements of these complex mechanisms
Versatile
Multipurpose system combines characterization, durability and vibration testing capabilities to addresses a very wide application range, including components, subsystems, assembled bogies and complete vehicles
Accelerated Testing
Improves the accuracy and reliability of advanced computer models used to optimize bogie and rail car speed, stability, comfort, and efficiency
Energy Efficient
Static support system reduces hydraulic oil flow needs during dynamic operation
Technical Overview
For each bogie, there are two axle/wheelset 6DOF excitation tables with 6DOF load cells mounted in line with the wheel platform.
Specimen Interface
Longitudinal Actuator (x2)
Restraint Struts
Hydraulic Service Manifold
Static Support
Vertical Actuators (x4)
Module Base Plate
Lateral Actuator
6DOF Load Transducer (x2)
Loading Table
Force Capacity
Displacement
Vertical
800 kN
+/– 100 mm
Lateral
400 kN
+/– 114 mm
Longitudinal
400 kN
+/– 85 mm
Pitch single table
600 kN-m
+/– 5.7 deg
Net pitch dual tables 1700 mm
2040 kN-m
+/– 5.7 deg
Net pitch dual tables 3000 mm
3600 kN-m
+/– 3.0 deg
Roll
360 kN-m
+/– 8 deg
Yaw single table
400 kN-m
+/– 8 deg
Net yaw dual tables 1700 mm
510 kN-m
+/– 6.5 deg
Net yaw dual tables 3000 mm
900 kN-m
+/– 5.0 deg
Units
2-ton Payload
33-ton Payload
Acceleration
Vertical
g
10
1.7
Horizontal
g
5
1
Velocity
Vertical
mm/s
750
750
Lateral
mm/s
400
400
Longitudinal
mm/s
750
750
Units
Fx
Fy
Fz
Mx
My
Mz
Capacity
N or N-m
140000
140000
255000
60000
120000
30000
FS Calibrated Range
N or N-m
+/- 140000
+/- 140000
255000
+/-35500
+/-35500
+/-30000
Loaded Axis Accuracy (1)
%FS Cal
0.30
0.30
0.30
0.50
0.50
0.50
Span Shift (2)
% RDG
0.2
0.2
0.2
0.4
0.4
0.4
Non-linearity (3)
%FS Cal
0.1
0.1
0.1
0.1
0.1
0.1
Hysteresis (4)
%FS Cal
0.2
0.2
0.2
0.2
0.2
0.2
Non-Repeatability
%FS Cal
0.05
0.05
0.05
0.2
0.2
0.2
Cross-talk on Unloaded Axes (5)
%FS Cal
Applied Load
Fx
N/A
0.25
0.5
1
1
1
Fy
0.25
N/A
0.5
1
1
1
Fz
0.5
0.5
N/A
1
1
0.5
Mx
1
1
1
N/A
1
1
My
1
1
1
N/A
1
Mz
1
1
1
1
1
N/A
Note: These numbers are typical results of the full calibration of the sensors. They are not guaranteed specifications, but are to be used for uncertainty analyses, with appropriate use of coverage factors as needed. Errors may be higher than specified for moment loads above calibrated range
Root-sum-of-squares for Non-Linearity, Hysteresis, and Non-repeatability, and Estimated Span Shift
Estimated Span Shift from Fixture Boundary Condition Changes
Deviation from a straight line through zero
Deviation between equivalent load points for ascending and descending data on a single load cycle
6x6 or 6x8 linear cross-coupling matrix may be necessary to achieve these estimates
The 4DOF active loading/reaction frame simulates car body motion and load to the bogie, or it can be used as a fixed reaction for primary and secondary suspension tests.
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