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Chattering-free sliding mode control with a fuzzy model for structural applications
Keyvan Aghabalaei Baghaei,Hosein Ghaffarzadeh,S. Ali Hadigheh,Daniel Dias-da-Costa 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.3
This paper proposes a chattering-free sliding mode control (CFSMC) method for seismically excited structures. The method is based on a fuzzy logic (FL) model applied to smooth the control force and eliminate chattering, where the switching part of the control law is replaced by an FL output. The CFSMC is robust and keeps the advantages of the conventional sliding mode control (SMC), whilst removing the chattering and avoiding the time-consuming process of generating fuzzy rule basis. The proposed method is tested on an 8-story shear frame equipped with an active tendon system. Results indicate that the new method not only can effectively enhance the seismic performance of the structural system compared to the SMC, but also ensure system stability and high accuracy with less computational cost. The CFSMC also requires less amount of energy from the active tendon system to produce the desired structural dynamic response.
Leila Vafajoo,Houman Savoji,Roozbeh Fayal,Ali Baghaei 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.8
A tanks-in-series model was applied for mathematical modeling of the unsteady state performance of 70and 100 liters airlift bioreactor for the production of lactic acid by fermentation. A set of first-order differential equations for the material balances of micro-organism, substrate, product, and dissolved oxygen around hypothetically well mixed stages was solved simultaneously utilizing computer program in MATLAB. The kinetic model utilized considered the effect of two substrates (glucose and dissolved oxygen) on the growth rate. The effect of air velocity on the lactic acid production was investigated. Results of this model have been validated with experimental data.