Positive position feedback (PPF) controller applied toa quarter car active Suspension systems

This paper presents the effect of the suspension working space, body displacement, body acceleration and wheel displacement for the non-controlled suspension system (passive system) and the controlled suspension system of a quarter car model (semi-active system), and comparison between them. The quarter car passive and semi-active suspension systems are modelled using Simulink. Proportional Integral Derivative controllers are incorporated in the design scheme of semi-active models. In the experimental work, the influence of switchable damper in a suspension system is compared with the passive and semi-active suspension systems.

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The Influence of Tire Damping in Quarter Car Active Suspension Models

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.2896339 ◽

1991 ◽

Vol 113 (1) ◽

pp. 134-137 ◽

Cited By ~ 34

Author(s):

J. A. Levitt ◽

N. G. Zorka

Keyword(s):

Damping Ratio ◽

Active Suspension ◽

Vertical Acceleration ◽

Body Acceleration ◽

Suspension Systems ◽

Active Suspension Systems ◽

Quarter Car ◽

Control Forces ◽

And Control ◽

Suspension Models

Setting tire damping to zero when modeling automotive active suspension systems compels the misleading conclusions that, at the wheelhop frequency, no matter what forces are exerted between sprung and unsprung masses, their motion are uncoupled, and the vertical acceleration of the sprung mass will be unaffected. Alternatively, taking tire damping to be small but nonzero, the motions of the sprung and unsprung masses are coupled at all frequencies, and control forces can be used to reduce the sprung mass vertical acceleration at the wheelhop frequency. The effect of introducing tire damping can be quite large. In the case of a force law chosen to enhance ride along a straight smooth road, where road holding is not a major concern, setting the tire damping ratio to 0.02 reduces rms body acceleration by 30 percent.

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H∞ Control of Active Suspension System for a Quarter Car Model

International Journal of Vehicle Structures and Systems ◽

10.4273/ijvss.8.1.07 ◽

2016 ◽

Vol 8 (1) ◽

Cited By ~ 7

Author(s):

N.M. Ghazaly ◽

A.S Ahmed ◽

A.S Ali ◽

G.T Abd El- Jaber

Keyword(s):

Ride Comfort ◽

Active Suspension ◽

Suspension System ◽

Passive Suspension ◽

Quarter Car Model ◽

Suspension Systems ◽

Car Model ◽

Active Suspension Systems ◽

Passive Suspension System ◽

Quarter Car

In recent years, the use of active control mechanisms in active suspension systems has attracted considerable attention. The main objective of this research is to develop a mathematical model of an active suspension system that is subjected to excitation from different road profiles and control it using H∞ technique for a quarter car model to improve the ride comfort and road handling. Comparison between passive and active suspension systems is performed using step, sinusoidal and random road profiles. The performance of the H∞ controller is compared with the passive suspension system. It is found that the car body acceleration, suspension deflection and tyre deflection using active suspension system with H∞ technique is better than the passive suspension system.

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