Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Analysis of fuzzy compensators applied in the intelligent control of electro-hydraulic systems
Submission Author:
Maria Carolina Albuquerque de Souza Santos , MG
Co-Authors:
Maria Carolina Albuquerque de Souza Santos, Marcelo Costa Tanaka
Presenter: Maria Carolina Albuquerque de Souza Santos
doi://10.26678/ABCM.COBEM2023.COB2023-1590
Abstract
Electro-hydraulic actuators are widely used in applications that require high power to size ratio, as well as high force and torque, such as precision machines and aerospace systems. They stand out for their quick response time and their greater energy savings when compared to electrical and non-hydraulic systems. However, this system has a high degree of nonlinearity present in its dynamics, such as the dead zone - which degrades the performance of the controlled system and generates instability in the closed loop system. This phenomenon occurs when there is an overlap between the flow control valve spool and the fluid passage hole, which prevents its flow for minimal displacements of the spool, impairing the efficiency of the actuators. Controllers based on conventional linear techniques have their performance compromised when facing such phenomena, therefore it is essential to implement more efficient techniques capable of guaranteeing security, control, and system performance. To ensure the application of these actuators in practice, in recent years, specialized literature in the field has been seeking the application of non-linear control techniques in the design of controllers, such as feedback linearization (FL) and sliding modes (SM), along with compensations based on artificial intelligence techniques such as fuzzy logic and neural networks. Previous publications demonstrate the robustness and performance of controllers using FL and SM techniques with fuzzy compensation against uncertainties and different trajectories using a single heuristically determined membership function, proving its efficiency in controlling electro-hydraulic actuators. This research seeks to improve the projects already created, making a comparative analysis of the performance of the fuzzy compensator when configured with triangular membership functions, which are equally spaced or spaced in a heuristic way. Results obtained from numerical simulations demonstrate the differences between each compensation strategy, as well as the efficiency and stability of the controller.
Keywords
Electrohydraulic servosystem, fuzzy control, Sliding mode control, feedback linearization
