Road Surface Profile Synthesis: Assessment of Suitability for Simulation

Abstract

Vibration analysis plays an essential role to enhance the design of the vehicle, related to its comfort and safety level. It is useful to determine the relations between the road profile or its characteristics to the particular properties of vehicles and evaluate the dynamic response to the applied road profile. During the design stage, the simulation of vehicle suspension requires an input of road surface for the initial dynamic load. Therefore, an artificial road profile, created according to a specific methodology, is a key to overall research success. It is possible to generate an artificial road profile using several mathematical methods. This paper is dedicated to analyzing and comparing the usability and ISO-compatibility of three methods: White noise filtration, sinusoidal approximation, and moving average of white noise. Furthermore, we modified the sinusoidal approximation, additionally using a windowing function, thus removing sharp jumps in a generated road profile. Each analyzed method has its advantages and disadvantages, therefore, proper choice in profile generation was a goal of the provided analysis. We defined that the moving average of white noise filtration method has the highest implementation perspectives due to the best compliance to the desired ISO-defined road profile shape and independence from simulation velocity.

Semi-Active System of Vehicle Vibration Damping

“…This paper presents studies where the vehicle vibrations were excited by a harmonic function. In order to relate the simulation results to road conditions, tests with random function excitation will be conducted [32,33].…”

“…In the presented paper, harmonic excitation was used. In this type of research, excitation based on the road profile in accordance with ISO 8608 [32,33] is often used. Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.…”

Optimization of Damping in a Semi-Active Car Suspension System with Various Locations of Masses

“…The reference frequency Ω 0 = 1 rad/m, the lower break frequency Ω 1 = 0.21 × 2π rad/m, and the higher break frequency Ω 2 = 1.22 × 2π rad/m produced a minimal error for the Swedish road network [63]. Additionally, a Welch-type windowing function with the value of the exponent equal to 10 was used to minimize the appearance of abrupt shifts at the connections between profile segments [64]. The profile generated in this way applied to the left side, and the profile for the right side was formed by randomly increasing or decreasing it by 20%.…”

Road Profile Modelling Based on Measurement for Fire Truck Simulation

“…There are several approaches to generate random road profiles based on the standard, which are white noise filtration, moving average of white noise, sinusoidal approximation, Gaussian white noise, hybrid approach, Laplace processes and Gaussian random field. 17 Lenkutis et al (2021) compares the white noise filtration, the sinusoidal approach and the moving average of white noise. In case of the white noise filtration, a white noise signal is transformed into a road profile through a first-order linear shape filter.…”