Browse Publications Technical Papers 2009-01-1614
2009-05-13

Performance of Active Suspension with Fuzzy Control 2009-01-1614

Vehicle suspension along with tires and steering linkages is designed for safe vehicle control and to be free of irritating vibrations. Therefore the suspension system designs are a compromise between ride softness and handing ability. However, this work is concerned with a theoretical investigation into the ride behavior of actively suspended vehicles. It is based on using fuzzy logic control (FLC) to implement a new sort of active suspension system. Comparisons between the behavior of active suspension system with FLC with those obtained from active systems with linear control theory (LQR), ideal skyhook system and the conventional passive suspension systems. Results are introduced in such a way to predict the benefits that could be achieved from fuzzy logic system over other competing systems. Furthermore, a controller is designed and made by using results of FLC system, theoretical inputs are used to examine the validity of this controller. Moreover, comparison between actual outputs from this controller with those obtained theoretical is made to judge the validity of the controller. The results indicate that the controller has a good capability in simulation of the theoretical model.

NOMENCLATURE

A
Road input amplitude, m 0.05
BA
Body acceleration, m/s2 -
C
Coefficient of power spectral density 5
C2
Suspension damping coefficient, Ns/m 1300
C3
Skyhook damping coefficient, Ns/m 20000
DTD
Dynamic tire deflection, m -
K1
Tire stiffness, N/m 192000
K2
Suspension stiffness, N/m 20000
M1
Unsprung mass, kg 45
M2
Sprung mass, kg 310
Rc
Road roughness coefficient 4 × 10−4
SWS
Suspension work space, m -
ts
Sampling time, s 0.01
V
Vehicle velocity, m/s -
y1
Body acceleration as an output, m/s2 -
y2
Suspension working space as an output, m -
y3
Dynamic tire loading as an output, m -
λ
Road wave length, m 10.46
ωc
Sprung mass natural frequency, rad/s 7

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