COBEM99

S22 Mecatrônica

Title:

SIMULATION OF THE ACTIVE CONTROL THROUGH FUZZY LOGIC IN A PULSE COMBUSTOR

Summary :

THE PRESENT WORK ANALYZES A CONTROL SYSTEM USING FUZZY LOGIC FOR A RIJKE TYPE PULSE COMBUSTOR. DURING SUCH DEVELOPMENT, A STUDY OF THE EXISTING CONTROL TYPES FOR PULSE COMBUSTION WAS CARRIED OUT AND A SIMULATION MODEL WAS PROPOSED TO BE USED WITH THE PACKAGE MATLAB AND SIMULINK. BLOCKS NOT AVAILABLE IN THE SIMULATOR LIBRARY WERE DEVELOPED. A CONTROL PLANT WAS USED FOR THE DEVELOPMENT OF THE SYSTEM. A FUZZY CONTROLLER WAS DEVELOPED AND ITS PERTINENCE FUNCTIONS AND INFERENCE RULES WERE ESTABLISHED. THE OBTAINED SIMULATION SHOWED THAT FUZZY LOGIC IS VIABLE IN THE CONTROL OF COMBUSTION INSTABILITIES. THROUGH THE OBTAINED RESULTS IT COULD BE INFERRED THAT THE CONTROL RESPONDED TO PULSES IN AN EFFICIENT WAY AND AS DESIRED. IT WAS VERIFIED THAT THE CONTROL NEEDED APPROXIMATELY 0.2 S TO INCREASE THE TUBE INTERNAL PRESSURE FROM 30 MBAR TO 90 MBAR, WITH AN ASSUMED TOTAL DELAY OF 2 MS. THE EFFECTS OF THE VARIATION OF THE DELAY WERE STUDIED AND IT WAS VERIFIED THAT, EVEN IF A LARGER TIME IS REQUIRED TO ACHIEVE CONVERGENCE, THIS HAPPENS, AND GENERAL PERFORMANCE IS NOT AFFECTED. THE CONTROLLER SENDS A PRESSURE SIGNAL IN PHASE WITH THE TUBE INTERNAL PRESSURE SIGNAL, THROUGH THE SPEAKERS, WHEN AN INCREASE THE OSCILLATION PRESSURE AMPLITUDE IS DESIRED. ON THE OTHER HAND, WHEN A DECREASE OF THE TUBE INTERNAL PRESSURE AMPLITUDE IS DESIRED, THE CONTROLLER SENDS A SIGNAL 180º OUT OF PHASE. KEY WORDS: FUZZY LOGIC, PULSE COMBUSTION, RIJKE TUBES.

Author :

Botura, Cesar Augusto
Botura Jr., Galdenoro 0
Carvalho Jr., João Andrade
Ferreira, Marco Aurélio

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