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LASER-INDUCED ROUGHNESS-INDEX ANOMALIES IN LONGITUDINAL BOXCAR AND DRAG CONFIGURATIONS

LASER-INDUCED ROUGHNESS-INDEX ANOMALIES IN LONGITUDINAL BOXCAR AND DRAG CONFIGURATIONS. Bernard Igbafen Izevbekhai P.E. Bernard.izevbekhai@state.mn.us Minnesota Department of Transportation Transportation Research Board Conference January 2012. TEXTURES INVESTIGATED.

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LASER-INDUCED ROUGHNESS-INDEX ANOMALIES IN LONGITUDINAL BOXCAR AND DRAG CONFIGURATIONS

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  1. LASER-INDUCED ROUGHNESS-INDEX ANOMALIES IN LONGITUDINAL BOXCAR AND DRAG CONFIGURATIONS Bernard Igbafen Izevbekhai P.E. Bernard.izevbekhai@state.mn.us Minnesota Department of Transportation Transportation Research Board Conference January 2012

  2. TEXTURES INVESTIGATED

  3. TRIPLE LASER AND LINE (ROLINE) LASER

  4. LATERAL WANDER IN BOX-CAR CONFIGURATIONS

  5. LATERAL WANDER IN BOX-CAR CONFIGURATIONS

  6. LATERAL WANDER IN BOX-CAR CONFIGURATIONS

  7. VARIOUS OBSERVATIONS

  8. VARIOUS OBSERVATIONS

  9. VARIOUS OBSERVATIONS

  10. VARIOUS OBSERVATIONS

  11. VARIOUS OBSERVATIONS Adjacent Lanes of the Same Cell

  12. STATISTICAL ANALYSIS Mann-Whitney Wilcoxon Method of Data Comparison

  13. STATISTICAL ANALYSIS Mann-Whitney Wilcoxon Method of Data Comparison

  14. CONCLUSION &RECOMMENDATION • The innovative grind and most recently the ultimate grind • configurations are widely accepted, sought after and used • because of excellent acoustic properties. • To a 95% confidence level, Innovative/ Ultimate grind • line and triple laser data are different • The different lasers may not be used interchangeably because of sensitive textures • Use line laser for acceptance testing of all Innovative grinds • .

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