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Abstract
Road humps are considered as one of the best design propositions to
control running vehicle speeds and provide a safe and calm traffic.
Although the traffic regulations and alertness of the driver are primary
important, hump designs and their configuration parameters are essential
from the point of view of vehicle dynamics. This thesis presents a
comparative theoretical analysis of the transient dynamic responses for
two different types of vehicles (passenger car and truck) when crossing
road humps with different profiles. The main objectives are the
evaluation of the ride comfort and road holding in terms of the vibration
acceleration of the vehicle in vertical and pitch modes, suspension
deflections, total tire loads and the dynamic ground clearance on standard
road hump shapes, vehicle speeds and wheel base considering the linear
and bilinear characteristics of dampers. Also, the Egyptian local road
humps have been measured and evaluated.
Genetic Algorithm (GA) has been used to find a new hump shape which
minimizes the ride comfort parameters up to the desired speed limit.
Also, the genetic algorithm has been used to design an active suspension
systems for both two types of vehicles for enhancement the ride dynamic
parameters and safety.
The results have been generated and presented in time domain and in
tables as root mean square values. The results showed that most of the
existing Egyptian road humps are not designed based on standard shapes
and the use of the new optimized humps improved safety of the vehicles
and traffic calming. Also, using an active suspension system significantly
improved the ride comfort and road holding requirement.