scholarly journals Adaptive Neuro Fuzzy Inference Controller for Full Vehicle Nonlinear Active Suspension Systems

2010 ◽  
Vol 6 (2) ◽  
pp. 97-106
Author(s):  
A. Aldair ◽  
W. J. Wang
Keyword(s):  
Fuzzy Inference ◽  
Active Suspension ◽  
Suspension System ◽  
The Body ◽  
Full Vehicle ◽  
Road Roughness ◽  
Neuro Fuzzy ◽  
Control Forces ◽  
Vehicle Suspension System ◽  
The Cost

The main objective of designed the controller for a vehicle suspension system is to reduce the discomfort sensed by passengers which arises from road roughness and to increase the ride handling associated with the pitching and rolling movements. This necessitates a very fast and accurate controller to meet as much control objectives, as possible. Therefore, this paper deals with an artificial intelligence Neuro-Fuzzy (NF) technique to design a robust controller to meet the control objectives. The advantage of this controller is that it can handle the nonlinearities faster than other conventional controllers. The approach of the proposed controller is to minimize the vibrations on each corner of vehicle by supplying control forces to suspension system when travelling on rough road. The other purpose for using the NF controller for vehicle model is to reduce the body inclinations that are made during intensive manoeuvres including braking and cornering. A full vehicle nonlinear active suspension system is introduced and tested. The robustness of the proposed controller is being assessed by comparing with an optimal Fractional Order PIλDμ (FOPID) controller. The results show that the intelligent NF controller has improved the dynamic response measured by decreasing the cost function.

Modelling and Simulation of Full Vehicle Model with Variable Damper Controlled Semi-Active Suspension System

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
P. Sathishkumar ◽  
S. Rajeshkumar ◽  
T.S. Rajalakshmi ◽  
J. Thiyagarajan ◽  
J. Arivarasan
Keyword(s):  
Numerical Simulations ◽  
Suspension System ◽  
Modelling And Simulation ◽  
Vehicle Suspension ◽  
Vehicle Model ◽  
Full Vehicle ◽  
Road Roughness ◽  
Control Forces ◽  
Suspension Model ◽  
Vehicle Suspension System

The main objective of the variable damper controlled vehicle suspension system is to reduce the discomfort identified by passengers which arises from road roughness and to increase the ride handling related with the rolling, pitching and heave movements. This imposes a very fast and accurate variable damper to meet as much control objectives, as possible. The method of the proposed damper is to reduce the vibrations on each corner of vehicle by providing control forces to suspension system while travelling on uneven road. Numerical simulations on a full vehicle suspension model are performed in the Matlab Simulink toolboxes to evaluate the effectiveness of the proposed approach. The obtained results show that the proposed system provides better results than the conventional suspension system.

Implementations of PID Controller and its Transient Behaviour in Active Suspension System

2014 ◽  
Vol 895 ◽  
pp. 490-499 ◽  
Author(s):  
Noor Hafizah Amer ◽  
Rahizar Ramli ◽  
Wan Nor Liza Wan Mahadi ◽  
Mohd Azman Zainul Abidin ◽  
Zainab Rasol
Keyword(s):  
Pid Controller ◽  
Ride Comfort ◽  
Research Effort ◽  
Active Suspension ◽  
Suspension System ◽  
The Body ◽  
Pid Controllers ◽  
Active Force ◽  
Transient Behaviour ◽  
Vehicle Suspension System

Advancement in computational technologies has accelerated the research effort in exploring the possibility of semi-active and active suspension. Computational simulations were used widely in the studies of the controller strategies. Among them are PID controllers. Studies from previous work suggested that PID controllers are capable of improving ride comfort and road holding capability. However, very little emphasis is given to examine the whole state of the vehicle suspension system resulted from this implementation. Therefore this study will examine the application of a basic PID controller to an active suspension system (ASS) to determine the requirement of active force that should be delivered in stabilizing the whole system. Two different configurations of electromagnetic suspension system (EMS) will be considered. One variable in the vehicle system will be selected to be the controlled output of PID controller and its effect to overall vehicle state will be observed. In the cases that the PID was able to stabilize the body responses, deterioration was noticed in the wheel responses. While it stabilizes the controlled output, the active force from controller was channelled into deteriorating other vehicle parameters.

Active Suspension Systems With Optimal Jerk Control

2006 ◽  
Author(s):  
M. Taghipour ◽  
D. Shahriari ◽  
A. Shahsavari
Keyword(s):  
Performance Index ◽  
Active Suspension ◽  
Suspension System ◽  
The Body ◽  
Ride Quality ◽  
Suspension Systems ◽  
Car Model ◽  
Active Suspension Systems ◽  
Ricatti Equation ◽  
The Cost

An active suspension system should be designed/optimized in conjunction with the tradeoff between ride and handling. In recent years, jerk as a measure of ride quality is considered in performance index. In this paper, effects of jerk in active suspension system for a 1/4 car model is investigated. In contrast to the previous papers, the body acceleration and jerk are derived directly from the system Hamiltonian instead of solving Ricatti Equation. The result shows that a reduction of jerk and acceleration is obtained against a higher rattle space and tire deflection. The compromise/tradeoff can be managed by setting appropriate weights in the cost function.

An Energy-Regenerative Suspension System

2018 ◽  
Author(s):  
Thomas Lato ◽  
Huiyong Zhao ◽  
Lin Zhao ◽  
Yuping He
Keyword(s):  
Fuel Economy ◽  
Pressure Gauge ◽  
Suspension System ◽  
Operating Conditions ◽  
Dissipated Energy ◽  
Stroke Length ◽  
Shock Absorbers ◽  
Road Roughness ◽  
Vehicle Suspension System ◽  
Variable Speed Motor

This paper presents an energy-regenerative suspension device that is able to harvest some of the wasted energy that is generated in a suspension system. For a traditional road vehicle suspension system, shock absorbers are mainly dissipating energy to reduce vibration. The dissipated energy may be collected to improve the fuel economy of road vehicles. In this research, CarSim and Simulink are used to simulate and determine the harvestable energy in a conventional shock absorber under different operating conditions. A conceptual energy-regenerative absorber is designed and tested using a fabricated prototype. A variable speed motor is implemented to adapt the change of stroke length of a mechanism due to the various road roughness. Instruments, e.g., laser tachometer, pressure gauge, ammeter, voltmeter, and stopwatch, are used to collect data. The simulation and prototype testing results indicate that the proposed energy-regenerative suspension device could harvest dissipated energy to improve vehicle fuel economy.

Servovalve-Controlled Pneumatic Suspensions

1979 ◽  
Vol 21 (1) ◽  
pp. 7-18 ◽  
Author(s):  
E. Esmailzadeh
Keyword(s):  
Relative Displacement ◽  
Suspension System ◽  
The Body ◽  
Analogue Computer ◽  
Surge Tank ◽  
Low Frequencies ◽  
Ground Vehicle ◽  
Pneumatic Suspension ◽  
Vehicle Suspension System ◽  
Made In

A linear analytical model of a ground-vehicle suspension system employing a pneumatic isolator and a three-way servovalve is developed. Damping is provided by connecting the pneumatic spring to a constant-volume surge tank through capillary resistances. Non-dimensional dynamic equations for the valve-controlled, self-damped, pneumatic isolator are derived and the effects of various feedback and feedforward controls on the performance of the closed-loop system are pointed out. Experiments are conducted to verify the validity of the assumptions made in deriving the absolute and relative displacement transmissibilities and the vehicle model is simulated on an analogue computer. It is shown that a servovalve-controlled pneumatic suspension system not only considerably reduces the body transmissibility at very low frequencies, but is also capable of very good isolation throughout the broad frequency range.

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