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Effect of Optimal Fuzzy Models for Pneumatic Magnetorheological Suspension System on Ride Performance under Different Conditions
Journal Article
10-06-04-0028
ISSN: 2380-2162, e-ISSN: 2380-2170
Sector:
Topic:
Citation:
Shehata Gad, A. and El-Demerdash, S., "Effect of Optimal Fuzzy Models for Pneumatic Magnetorheological Suspension System on Ride Performance under Different Conditions," SAE Int. J. Veh. Dyn., Stab., and NVH 6(4):421-440, 2022, https://doi.org/10.4271/10-06-04-0028.
Language:
English
Abstract:
In this article, the nonlinear pneumatic magnetorheological (MR) suspension
system is designed to improve vehicle characteristics in both ride comfort and
dynamic stability. The four-degree-of-freedom (4-DOF) half-vehicle suspension
system that is described based on bounce and pitch motions is derived. Both
interval type-1 (T-1) and interval type-2 (T-2) of fuzzy models are applied as
alternative controllers for the pneumatic MR suspension system. Both a
controlled force of air spring and tracking ability of desired damping force are
generated for each wheel of alternative controllers. In order to apply voltages
for both the front and rear MR dampers, the tracks of desired damping forces are
incorporated with the front MR damper controller and rear MR damper controller,
respectively. The conventional damping case of the passive suspension system is
used as a baseline for comparisons. The control performance criteria are
presented in the frequency and time domains to quantify the suspension
effectiveness under bump and random road disturbances. The point contact tire
model is compared with the rigid tread band model based on fit for the proposed
suspension systems. The simulation results show that the pneumatic MR suspension
system integrated with the rigid tread band tire model is more effective in
improving vehicle characteristics than the passive suspension system. The
transmitted tire force based on the point contact tire model may be
overestimated, but it is underestimated with the fixed footprint model.
Especially at the resonance peaks, it can also be seen that the pneumatic MR
suspension system is capable to dissipate the vibration energy when compared
with the passive suspension system under different road conditions.
Significantly, this system can maintain the sprung mass height constantly with
the control vehicle body due to pitch motion.