Error Analysis for a Proposed Moving Dynamic Deflection System for HighwayPavements

摘要

This report has conducted an error analysis of a system for dynamically measuringroad deflection. The system configuration has been proposed by Surface Dynamics, Inc., and consists of an instrumented tractor-trailer truck configuration that will permit road deflection measurements to be made at highway speeds. The proposed system utilizes a beam that is configured to carry laser distance measuring sensors. The sensors are positioned to maake reference measurements of undeflected surface as well as the deflected surface. Signal processing algorithms are proposed that give the system the potential to compensate for beam movement as well as the random surface texture features. This study has conducted a complete error analysis of the system beginning with suitable mathematical models for all components as well as all signal processing steps. A random and systematic error analysis was conducted of all components and of the complete system. This study was conducted analytically as well as in computer simulation. The error analysis has shown that the system total errors are within the allowed error bands for practical application provided all components function in accordance with manufacturers stated performance capability.