Application of Hilbert Huang Transformation to Analyze Pavement Texture-Friction Relationship

Open Access
Cho, Choongwoo
Graduate Program:
Civil Engineering
Master of Science
Document Type:
Master Thesis
Date of Defense:
July 23, 2010
Committee Members:
  • Dr Stoffel, Thesis Advisor
  • Shelley Marie Stoffels, Thesis Advisor
  • Zoltan Ivan Rado, Thesis Advisor
  • Mansour Solaimanian, Thesis Advisor
  • Hilbert Huang Transform
ABSTRACT For road geometries and areas where vehicle maneuvers require the utilization of friction, traffic safety depends considerably on available surface friction. Investigation discovered that several of Pennsylvania’s roads, constructed according to standard design and construction techniques and paved with Portland cement concrete, showed unpredicted, rapid friction (skid resistance) deterioration well before the expected time frame and these roads reached dangerously low levels of frictional characteristics. The objective of the PennDOT project’s study was evaluation of the effect of blending Vanport limestone and other aggregates. The study evaluated the performance of different mortar fractions and aggregate concentrations to determine the effect of using coarse aggregate in the top mortar layer on pavement friction performance, as well as the effect of the substitution of different aggregates in place of Vanport limestone. Ten slabs, cast for the PennDOT research project and for wear processing, underwent testing used Model Mobile Load Simulator (MMLS 3) with incremental test cycles, ranging from 15,000 to 360,000 cycles. Measurements collected from the conduced texture profile using the Circular Track Meter (CTM) formed the basis for a database for the Hilbert Huang Transform method to analyze the texture profile data. A Dynamic Friction Tester measured the coefficient of friction parameters at various speeds. The Hilbert Huang Transform (HHT) mathematical approach, created by Huang (2005) is a unique tool for processing surface texture profiles. The HHT method allows measured texture profiles to be analyzed without an underlying set of assumptions that confine the analysis to a finite set of basic functions. Based on the database gained from CTM in PennDOT’s Vanport limestone project, the Hilbert Huang Transform method analyzed the texture-friction relationship. This method calculated Intrinsic Mode Functions. The amount of decomposed components, however, was sometimes inconsistent among test data. To adequately and uniformly describe the texture profile, this study selected four Base Intrinsic Mode Functions (BIMFs). Analysis of the new database obtained from the Hilbert Huang Transform method used regression statistics methodology with the values from the Dynamic Friction Tester (DFT). Additional investigation analyzed the correlation between BIMF and DFT parameters for each cycle. The analysis for the correlation between all BIMFs and DFT peak values use a 65km/h standard, and analyses included considering a correlation for BIMFs. As shown in the analysis results, a strong relationship exists among BIMF functions and DFT coefficient of friction values. The correlation between BIMF and DFT parameters for each cycle is more significant than previous analysis results, and the best correlation appeared at 360,000 cycles. DFT peak values at 65km/h strongly relate to 4 BIMF parameters. BIMFs and Speed Number (Sp) values displayed a significant correlation with each other, as did Sp values significantly relate to one BIMF parameter. Three BIMF parameters were significantly correlated to F 60 values. Having observed stronger correlations among data than previous studies’ data results, the HHT method might be a suitable alternative to conventional techniques.