Euler C. M. Gonçalves Barbosa
Aeronautics and Space Institute (DCTA/IAE), São José dos Campos, São Paulo, Brazil
Luiz C. S. Góes
Technological Institute of Aeronautics (DCTA/ITA), São José dos Campos, São Paulo, Brazil
Thiago Scharlau Xavier
Technological Institute of Aeronautics (DCTA/ITA), São José dos Campos, São Paulo, Brazil
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http://dx.doi.org/10.3384/ecp181565Published in: WIEFP2018 – 4th Workshop on Innovative Engineering for Fluid Power, November 28-30, Sao Paulo, Brazil
Linköping Electronic Conference Proceedings 156:2, p. 5-10
Published: 2018-12-10
ISBN: 978-91-7685-136-4
ISSN: 1650-3686 (print), 1650-3740 (online)
This work presents the research and technological development of a hydraulic high Pressure Fed System (named PFS) using Nitrogen/Helium gas and a fast electro-hydraulic actuator (FEHA) applied to movable nozzles for Brazilian sounding rockets and microsatellite launchers. The preliminary control capability analysis to sounding rockets design requires a high performance FEHA, e. g. the bandwidth, to perform the attitude control using the Thrust Vector Control (TVC) strategy. The Thrust Vector Assembly (TVA) consist of the PFS mounted on the EHA that controls the nozzle angular movement, in closed-loop operation. Modeling and simulation results using AMEsim environment show the PFS performance compared to step-unit response obtained from experimental tests. Frequency Response Functions (FRF) are obtained from experimental data using sinusoidal signals of excitation with frequency from 1 to 10 Hz, and the bandwidth Bw is accessed. Equipment to the PFS includes a pressure regulator to the helium gas in order to pressurize the hydraulic fluid with a constant pressure of 200 bar. A high performance electro-valve controls the oil flow in the hydraulic cylinder and a real-time digital controller is implemented to stabilize the closed loop. The results are of very interest if compared to the European actuator flight model of the Brazilian satellite launcher vehicle VLS-1. Details and improvements are discussed in order to obtain best bandwidth in the next FEHA engineering model, e.g. the digital flow control technique to the servo-valve.
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