A Method of Measuring Pavement Profile Curve by Cholesky Decomposition

Abstract

The invention discloses a method for measuring a pavement profile curve through Cholesky decomposition. The method comprises the steps that the starting point pavement elevation q(0) and the terminalpoint pavement elevation q(n) are collected, and the midpoint vector distance v(i) between a starting point and a terminal point is measured, wherein i=1,..., n-1; a midpoint vector distance sequence{v(i)|i=1,..., n-1} is taken as input, a path line {tilde{q}(i)|i=1,..., n-1} is calculated through a root-squaring method; the starting point elevation q(0) and the terminal point elevation q(n) aresubstituted, and the pavement profile curve {q(i)|i=1,..., n-1} is calculated. According to the method, the pavement profile curve is calculated through the starting point elevation, the terminal point elevation and the midpoint vector distance between the starting point and the terminal point, the problem of low efficiency of a level gauge elevation measuring method and the problem of trend termof a pavement unevenness laser measuring method based on inertial reference are avoided, and a measuring device is simple in structure and good in environmental adaptability.

Description

technical field [0001] The invention relates to the technical field of road traffic, in particular to a method for measuring the profile curve of a road surface through Cholesky decomposition. Background technique [0002] The height q of the road surface relative to the datum plane and the change q(I) along the length I of the road are called the road surface profile curve or roughness function. Pavement profile curves have numerical characteristics that affect vehicle dynamics, ride quality, and road dynamic loads. Since the pavement profile curve is a random signal, a definite mathematical relationship cannot be given, so the pavement roughness is often described by statistical features. The road roughness power spectrum method (power spectral density, PSD method) and the international roughness index (international roughness index, IRI) are currently the main methods for evaluating road surface roughness. Among them, the PSD method is mostly used in the field of vehicle...

AI Technical Summary

Problems solved by technology

Level height measurement method, the measurement process is simple, the measurement result is stable, but the measurement speed is low

The measurement speed of the 3-meter ruler measurement method is faster than that of the level measurement method, but the wavelength range is small

The laser measurement method of road surface roughness based on inertial reference has high measurement accuracy and fast measurement speed, but it is difficult to avoid the existence of trend items due to the random walk in dead reckoning

[0004] Using the follow-up reference, the distance from the straight beam to the road can be measured through three distance measuring sensors, and the vector distance can be calculated, which can get rid of the troubles of zero point, gain drift and vehicle-wheel-road coupling, but it is limited by the structural size, so it is not easy to directly Estimated Pavement Profile Curve

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