THE STUDY OF THE AUTOMATIC SYSTEM FOR THE SEALED COCKPITS AIRFLOW REGULATION USING INDIRECTLY ACTION AIRFLOW REGULATORS
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
The paper presents the mathematical model of an automatic system for the sealed cabin airflow regulation using indirectly action airflow regulator. The goal of this Automatic Regulation System (ARS) is to constantly provide a certain pressure in the cabin, accordingly to the altitude. After deducing the equations of the system and the state equations that characterize it, the authors of the paper have simulated the system in Matlab/Simulink medium in order to analyze the ARS’s dynamic characteristics; thus, using a Matlab/Simulink model and a Matlab program, time characteristics representing the time variation of the non-dimensional cabin pressure, time variations of the non-dimensional displacement of the sensitive element and time variation of the non-dimensional regulator surface have been obtained. One highlights the disturbances that act on the system and the transfer functions which express the response of this system to these disturbances and one makes assessments regarding these disturbances’ influence upon stabilization of the cabin pressure. The originality of this work is the obtaining of the system’s mathematical model and the analysis of its dynamic behavior (the obtaining of the transfer functions, poles, zeros, stability’s analysis, response of the system to one or two inputs and so on). The duration of the transient regime is about 18 seconds. In general this transient regime isn’t a good one, but, in this case, this transient regime’s duration is good because the system of pressure’s regulation is a slow system (the pressure’s regulation must not be done very quickly). The system is stable (the step responses of it proves this fact).
Authors and Affiliations
Romulus LUNGU, Mihai LUNGU
Keywords
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