Research on 3D Modeling Method of Cobblestone Road Based on Geometric Characteristics

Jinhua Han,Huanliang Li,Ke Feng,Jing Chen,Hongxin Cui

doi:10.1155/2018/7246503

Jinhua Han, Huanliang Li + Show 3 more

Open Access

https://doi.org/10.1155/2018/7246503

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Abstract

Based on the analysis of the geometric characteristics, distribution characteristics, and constraints of the cobblestone road, a three-dimensional (3D) parametric road modeling method based on geometric characteristics is proposed. The cobblestone model is established by the exponential oval equation, and the cobblestones distribution is determined by Monte Carlo stochastic search method. Then the 3D theoretical model of cobblestone road is obtained. To veritably simulate the cobblestone road, a generated 3D random road is fusing with the 3D cobblestone road model by alternating values, and the comparison between the real and modeling cobblestone roads is done in space domain and PSD curves. Then based on the establishment of the standard vehicle vibration model, the influences of the key geometric parameters of the cobblestone road on the vehicle vibration are analyzed by using the evaluation indices of the IRI and the RMS of the vehicle body acceleration. The proposed method can be extended to the 3D modeling of almost all strengthened test roads such as Belgian road, fish-scale pits road, ripple tracks, and washboard road and provides a 3D road modeling method with adjustable parameters, authenticity, and accuracy for the comprehensive construction of vehicle virtual test field.

Highlights

With the rapid development and update of the vehicle, compared with the real vehicle driving test [1], the vehicle road simulation test [2] and virtual road test [3] have attracted more and more attention in automotive engineering field in recent years with the advantages of time-saving, low costs, high accuracy, repeatability, controllability, and so forth.Road profile [4] is the most important external excitation of the ground vehicle, which influences vehicle ride comfort, operational stability, driving reliability, fatigue life of components, and so forth
The International Roughness Index (IRI) is the cumulative value of the relative displacement between the sprung mass and the unsprung mass per kilometer when driving on the corresponding road with the excitation of road roughness, expressed by m/km
Corresponding to the road profile represented by IRI, the root mean square (RMS) of vehicle body acceleration is the important index of vehicle vibration intensity, and its value is directly related to vehicle reliability and ride comfort

Summary

Introduction

With the rapid development and update of the vehicle, compared with the real vehicle driving test [1], the vehicle road simulation test [2] and virtual road test [3] have attracted more and more attention in automotive engineering field in recent years with the advantages of time-saving, low costs, high accuracy, repeatability, controllability, and so forth.Road profile [4] is the most important external excitation of the ground vehicle, which influences vehicle ride comfort, operational stability, driving reliability, fatigue life of components, and so forth. Based on the establishment of the standard vehicle vibration model, the influences of the key geometric parameters of the cobblestone road on the vehicle vibration are analyzed by using the evaluation indices of the IRI and the RMS of the vehicle body acceleration.

Results

Conclusion