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1

Robustness study of the road profile estimation technique under uncertainty

Ben Jdidia Anoire, Ben Hassen Dorra, Hentati Taissir, Abbes Slim, Haddar Mohamed

Journal of Theoretical and Applied Mechanics

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2022

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Vol. 60 nr 3

521--533

EN

This paper studies profile estimation a road. The prediction has been achieved using the Independent Component Analysis Method (ICA). The vehicle dynamic responses were cal- culated for different road profiles which were defined using an ISO norm. The robustness of this method was proven by implementing the stochastic Monte Carlo (MC) technique in the presence of inevitable uncertainty parameters simultaneously associated with the vehicle mass, spring stiffness and damping for different vehicle speeds and wind values. Convergence was assessed when comparing real profiles to simulated ones. The obtained results prove the efficiency of the ICA in estimating the profile variabilities under uncertainties.

2

H∞ active control of a vehicle suspension system exited by harmonic and random roads

Marzbanrad J., Zahabi N.

Mechanics and Mechanical Engineering

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2017

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Vol. 21, nr 1

171--180

EN

This paper proposes a controller based upon H∞ control approach in order to improve the vehicle performance under two different road profiles. In this study, there are two control targets that they are car body travel and suspension deflection. In fact, H∞ controller is responsible for minimizing the infinity norm of two subsystems. The first one is from car body travel to road disturbance and second is from suspension deflection to road disturbance. These two control targets must be improved by a logical control input that is determined by H∞ control approach. In order to improve the performance of the quarter-car, weighting functions are also defined. Disturbance that is the system input is considered as two types of road profiles, harmonic and random. The results show that the H∞ controller is able to improve the quarter-car performance for both roads. In addition, the sensitivity analysis is done to show that the active suspension system is able to work when sprung mass changes as may be occurred when passengers added.

3

Quarter car model to evaluate behaviour under road and body excitation

Niculescu A. I., Jankowski A., Kowalski M., Sireteanu T.

Journal of KONES

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2017

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Vol. 24, No. 1

265--273

EN

The paper presents a quarter car model two degrees of freedom (wheel and body), with vertical guiding system, the model being equipped with suspension stroke limiters and with excitation by wheel and/ or by body. The model reproduces elastic and damping characteristics of wheel and of rebound and compression stopper bumpers, the spring elastic characteristic and the shock absorber damping characteristic on rebound and compression, function piston speed. The road profile is generated with simple or summation of harmonic functions, or by reproducing real roads. The forces acting on full vehicle body e.g. aerodynamic and inertial forces are reproduced in the proposed quarter model by vertical forces reduced to the analysed quarter part. Thus, the model can be used for evaluation the vertical and horizontal stability at acceleration, deceleration, pitch and roll, at aerial forces, the body ground clearance and the comfort. The model can evaluate the influence of the damping and elastic characteristics of suspension and wheel, of the static position, of the vehicle load state, of the road profile and of the external forces, to the vehicle behaviour

4

Design and development of a semi-active suspension system for a quarter car model using PI controller

Siswoyo H., Mir-Nasiri N., Ali M. H.

Journal of Automation Mobile Robotics and Intelligent Systems

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2017

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Vol. 11, No. 4

26--33

EN

This paper presents the design and development of a semi-active suspension system for a vehicle. The main idea is to develop a system that is able to damp vibration of the vehicle body while crossing the bumps on the road. This system is modeled for a single wheel assembly and then the laboratory prototype of the complete system has been manufactured. It is used to physically simulate the spring-mass-damper system in vehicle and observe the frequency response to the external disturbances. The developed low-cost smart experimental equipment consists of a motor with offset mass which works as an oscillator to induce vibration, a spring-mass-damper system where the variable damper works as a pneumatic cylinder that allows varying the damping constant (c). Proportional-Integral (PI) controller is used to control the damping properties of the semi-active suspension system automatically. The system is designed in contrast to the most of the available suspension systems in the market that have only passive damping properties. The results of this research demonstrate the efficiency of the developed variable damper-based control system for the vehicle suspension system.