Laser evenness measuring system and method based on acceleration compensation

Abstract

The invention provides a laser evenness measuring system and a method based on acceleration compensation. The method of the invention comprises the following steps: at regular time interval, measuring the vertical distance between a specific point on a road vertical section and a car body; at the moment of measuring the distance, synchronously measuring the acceleration of the car body in the vertical direction; according to the progression of the recorded vertical direction, fitting the distance progression of the road vertical section and the car body with the least square method; carrying out quadratic integral to the recorded acceleration value progression to obtain a car body bumping value; according to the bumping value, fitting the bumping progression of the car body in the vertical direction with the least square method; subtracting the car body and road surface distance progression from the vertical bumping progression of the car body to obtain a road surface undulate progression; re-sampling the road surface undulate progression at the interval of 25 cm; and calculating to obtain the road surface evenness value according to 1 / 4 vehicle model. The invention can realize the evenness measurement with wide variable speed, high precision and high reliability.

Description

technical field [0001] The invention belongs to the field of instruments and meters, in particular to the field of road engineering instruments. The invention relates to a laser flatness measurement system and method, in particular to a laser flatness measurement system and method using accelerometer acceleration compensation. Background technique [0002] The roughness of the road surface mainly reflects the flatness of the profile curve of the road surface profile. When the profile curve of the road surface profile is relatively smooth, it means that the road surface is relatively smooth, or the flatness is relatively good. Otherwise, it means that the flatness is relatively poor. A good road surface The smoothness of the road surface is also required. [0003] Pavement roughness is an important index in pavement evaluation and pavement construction acceptance. The smoothness directly reflects the driving comfort of the vehicle and the safety and service life of the road ...

AI Technical Summary

Problems solved by technology

[0029] The traditional flatness measurement equipment is mainly a spirit level, a three-meter ruler, and a continuous flatness meter. The test accuracy is low, the speed is slow, and the repeatability is poor. Generally, the measurement speed is less than 5 kilometers, which is time-consuming and labor-intensive. The highway in use is basically unusable

[0030] Some existing flatness measurement equipment based on inertia compensation, due to its simple inertia compensation algorithm, can only meet the flatness measurement under high-speed conditions (generally not less than 25 km / h running speed), while at lower speeds, Due to the drift of the inertia compensation, the correct measurement result cannot be output

Images