Nouby M. Ghazaly

Simulation control of an active suspension system using fuzzy control & H ∞ control methods

The motor vehicles industry has shown a mechatronic system with intelligent and autonomous properties. The mechatronics system is integration of hardware components, implementation of advance control function characterize and information technology. Vehicle suspensions systems typically rated by its ability to provide good road handling and improve passenger comfort. Active suspension poses the ability to reduce the traditional design as a compromise between handling and comfort by directly controlling the suspensions force actuators. The mathematical model for the passive and active suspensions systems for quarter car model is proposed. This paper describes fuzzy and H∞ techniques for the automobile active suspension system. The design objective is to provide smooth vertical motion so as to achieve the road holding and riding comfort over a wide range of road profiles. The objective of the proposed control schemes is demonstrated via simulations. The simulation results of the different controllers are compared by using MATLAB /SIMULINK toolbox. Results demonstrate the effectiveness and usefulness of the proposed control method. The simulation results indicate that the proposed active suspension of fuzzy logic control is very effective than the other techniques.

Effect of wedge inclination angle on self-amplification action of a new adaptive wedge disc brake

Brake performance remains a topic of ongoing research despite much progress being made especially in the last decade. Many of the feasible mechanisms are far from being fully improved. In this work, a new adaptive wedge disc brake mechanism is designed and constructed to increase the brake performance. The effect of wedge inclination angle on the disc brake performance is investigated under different operation parameters using brake dynamometer. The experimental results indicated that the brake force generally fluctuates as a function of braking time due to the friction coefficient behaviour. The wedge inclination angle has a significant effect on improving the brake force. It is also observed that as the wedge inclination angle decreases the self-amplification action of the brake system increases and the brake force improves.