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Fuzzy Skyhook Surface Sliding Mode Control for Semi-active Suspension system

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Fuzzy Skyhook Surface Sliding Mode Control for Semi-active Suspension system

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Sliding Mode Control, Skyhook Damper, Fuzzy Logic Control, Semi-Active Suspension System

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Description

A skyhook surface sliding mode control method was proposed and applied to the control on the semi-active vehicle suspension system for its ride comfort enhancement. A two degree of freedom dynamic model of a vehicle semi-active suspension system was given, which focused on the passenger’s ride comfort perform-ance. A simulation with the given initial conditions has been devised in MATLAB/SIMULINK. The simula-tion results were showing that there was an enhanced level of ride comfort for the vehicle semi-active sus-pension system with the skyhook surface sliding mode controller.

Acknowledgements

Sgalab 1003 Beta 5.0.0.8( Matrix Varaible Inputs ) inspired this file.

This file inspired Simple Econometrics And Computational Finance Laboratory Toolbox.

MATLAB release MATLAB 7.7 (R2008b)
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Comments and Ratings (3)
07 Jun 2012 Santhosh Vasudevan

the model seems to be good but when i run it gives me this error. why is that so?
Error in 'SGA__suspension_flc_quarter/2-in-1-out FLC' while executing MATLAB S-function 'SGA__suspension_flc_std_2in1out_sfunction', flag = 2 (update), at time 0.0.

05 Apr 2012 Olexander Zhytenko  
25 Mar 2010 Koldo

There is a fundamental problem with this Simulink scheme: there is an algebraic loop since the value of "ecc" is being computed through a derivative block. This makes the simulation result sensitive to the selected integration step-size. To fix this issue just compute the value of this signal directly from the state variables of the plant. It is easy and solves the problem. I did it and everything works perfectly for any integration step-size!

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