Figure 40. Force-deflection histories calculated from bogie nodal accelerations depend significantly on the bogie type and output sampling frequency. Graph.

This graph shows five distinct lines. The first is solid yellow and is labeled Grade 1 Southern Yellow Pine Test 657. The second line is solid blue and is labeled Rigid Bogie, 10000 Samples per second while the third line is solid red and is labeled Rigid Bogie, 3200 Samples per second. The fourth line is solid aqua and is labeled Elastic Bogie, Accelerometer Node, 3200 Samples per second. Finally, the fifth and final line is solid green and is labeled elastic Bogie, Cylinder Node, 3200 Samples per second. The vertical axis of this graph ranges from –50 to 150 and represents force (kilonewtons) while the horizontal axis of this graph ranges from 0 to 200 and represents Deflection (millimeters). All five lines begin at the points of zero on both the vertical and horizontal axes. The solid yellow line slopes upward gradually to the points of 50 on the vertical axis and 80 on the horizontal axis where it then slopes downward and off the graph at the points of –20 on the vertical axis and 200 on the horizontal axis. The solid blue line moves across the graph in minute waves. It first peaks at the points of 50 on the vertical axis and 40 on the horizontal axis and then slopes back down to the points of 40 on the vertical axis and 60 on the horizontal axis. From there the blue line slopes up ever so slightly again to the points of 45 on the vertical axis and 80 on the horizontal axis where it then slopes back down and off the graph at the points of zero on the vertical axis and 200 on the horizontal axis. The solid red line slopes up significantly to the points of 120 on the vertical axis and 40 on the horizontal axis. It then slopes down steeply and runs off the graph at the points of –10 on the vertical axis and 200 on the horizontal axis. The solid aqua line runs across the graph in pronounced waves. The first peak the aqua line reaches is at the points of 70 on the vertical axis and 40 on the horizontal axis where it then slopes down to the points of 10 on the vertical axis and 65 on the horizontal axis. From there it slopes upward to the points of 55 on the vertical axis and 90 on the horizontal axis where it slopes down steeply to the points of –25 on the vertical axis and 110 on the horizontal axis. At this point, the aqua line slopes upward to the points of 45 on the vertical axis and 135 on the horizontal axis where it slopes down one last time to the points of-15 on the vertical axis and 155 on the horizontal axis. The aqua line slopes upward on more time to the points of 50 on the vertical axis and 200 on the horizontal axis where it ends. The solid green line first peaks at the points of 50 on the vertical axis and 40 on the horizontal axis. From there it wavers down to the points of 25 on the vertical axis and 120 on the horizontal where it continues to waver until it falls off the graph at the points of zero on the vertical axis and 200 on the horizontal axis.

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FHWA-HRT-05-096