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A novel compound controller is developed for the vehicle active suspension with an electro-hydraulic actuator. The models of the actuator and the quarter vehicle are both first established. A compound controller is designed to utilize RBF neural network approximate the output of PID, and to combine PID algorithm with a RBF neural network output as its control laws. This controller synthesizes both...
A half-vehicle 4-DOF dynamic model was built up, as a non-linear, time-delay and uncertain system of vehicle suspension, the parameters of self-adjusting fuzzy PID controller was designed of semi-active suspension, which to achieve the functions of PID parameters on-line amendment, and the C-class road as an input signal. The use of Matlab/Simulink simulation software simulate the smoothness indicators...
In this paper we explore the dynamics of a single-track car model. We develop a model of a rigid car inspired to the well known bicycle model. The bicycle model is a planar rigid model that approximates the vehicle as a rigid body with two wheels. However, the bicycle model does not allow to describe the effect of load transfer, since it does not model the suspensions. Using an explicit formulation...
This paper describes the mathematical model and simulation of controller for active suspension with Linear Quadratic Regulator (LQR) controller and about the improvement in performance. In this work, a controller is designed for active suspension system and simulated for both passive and active suspension system using SIMULINK in MATLAB. Two controller design approaches, namely conventional method...
The suspension system plays a critical role in the dynamics of an automobile and active force actuators in the suspension can result in improved dynamics, be it ride comfort, better road holding or reduced body roll. In this paper, a control scheme has been developed for an electronically controlled pneumatic actuator that can be used in suspensions of commercial vehicles such as trucks, tractors-trailers...
Aimed at the effect of variable coefficients and the constant coefficients to the system, a quarter-car two degree freedom suspension vibration model is described, with the aid of matlab alternating senior programmable language, the algorithm is gained through function file, the simulation model of the road noise and the suspension system is obtained. Moreover, The one order standard sensitivity function...
Aiming at analysing influence of chassis torsional stiffness on handling performance, we build a four degrees of freedom vehicle model that includes chassis torsional degree to study chassis roll distortion. Influence of chassis torsional stiffness on steady-state roll angle of front/rear suspension and transient understeer gradient are simulated. Through changing chassis torsional stiffness, we find...
In this paper, six DOF model has been established for non-independent suspension vehicle with Robertson - Widenborg multi-body dynamics method. On this basis, Yaw velocity gain of a heavy vehicle was simulated by Matlab. The simulation results verified the model is reasonable. After further simulation, it indicates the model has theory significant for researching the handling and stability and designing...
In this paper, a six degree of freedom half body vehicle suspension system is developed and the road roughness intensity is modeled as a filtered white noise stochastic process. Based on control theory, the fuzzy control system of the active suspension is established. With the aid of software Matlab/simulink, simulation process is done. Simulation results indicate that the proposed active suspension...
In this paper, a new active suspension control scheme is proposed in which the tire deflections are not required. The controller has good property that we can specify a location where the ride comfort becomes best. To achieve this end, a combined ideal vehicle is designed. In the ideal vehicle, the location where ride comfort becomes best can be moved by setting only one design parameter. Next, to...
This paper investigates integrated vehicle dynamics control through coordinating active suspension system (ASS) and electronic stability program (ESP) in order to improve the overall vehicle performance including handling, stability, and comfort. A two-layer hierarchical control architecture is proposed to integrated control of the two chassis control systems. The upper layer controller is designed...
In this paper, a control strategy of active suspension based on the fuzzy logic control has been investigated. Using incorporating feedback from force sensor at front and rear active suspension system, the control system shows the improvement of the dynamic responses of the vehicle. A multi degree-of-freedom nonlinear model is co-simulated by MATLAB/Simulink and ADAMS/car. The simulation results indicate...
The paper is concerned with an active suspension system for vehicles using a LQG control. The model created here is described by a linear system with four degrees of freedom, subject to random excitation from road surface. The control is determined from the view-point of ride comfort, minimizing a given perform index. The simulation results indicate that the proposed active suspension system performs...
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