Effect of Proportional Valves and Cylinders on the Behavior of Hydraulic Positioning Systems

Muraro, Irving; Teixeira, Paulo L. B.; Negri, Victor Juliano De

doi:10.1115/fpmc2013-4496

Cited by 4 publications

(3 citation statements)

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“…In this paper, step response (x rp ) of, 50 mm, a setting time (t s ) of 1 s and a maximum force (F t ) of 20 kN at 210 bar in regenerative mode, were considered. Using the methodology present in [24] and [25] the maximum actuator velocity was obtained [v max ], resulting in 0.111 m/s. The areas of the linear actuator used in the system are 1544, 1102, 707 and 1344 mm 2 , for the chambers A, B C and D, respectively.…”

Section: Digital Hydraulic Actuator Proposedmentioning

confidence: 99%

Multi-Chamber Actuator Using Digital Pump for Position and Velocity Control Applied in Aircraft

Nostrani

Raduenz

Dell’Amico

et al. 2023

TJFP

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This paper presents a multi-chamber hydraulic actuator controlled by digital pumps and on/off valves, in order to improve the efficiency of hydraulic systems applied in aircraft for flight control. Hydraulic positioning systems are used in many different applications, such as mobile machinery, industry and aerospace. In aircraft, the hydraulic actuators are used at flight control surfaces, cargo doors, steering, landing gear and so one. However, the massive use of resistive control techniques, which throttles the passages of the hydraulic fluid, associated with internal leakage of the hydraulic components, make these systems low energy efficient. In order to improve their energy efficiency, digital hydraulics emerges as a promising solution mainly for mobile applications. In this paper a hydraulic positioning system for aircraft control surfaces using a multi-chamber actuator controlled by on/off valves and a digital pump is proposed. The use of a digital pump with three fixed displacement pumps can provide eight different volumetric displacement outputs. The multi-chamber actuator with four areas can operate in two different modes, normal or regenerative, resulting in six different equivalent areas. The regenerative mode allows the actuator to achieve higher actuation velocity values with smaller pumps. These equivalent areas combined with the different supplied flow rates can deliver 43 different discrete output velocity values for the actuator, in steady-state. For the system dynamic analyses, three mathematical simulation models were developed using MATLAB/Simulink and Hopsan, one for the digital system, and two for the conventional solutions applied in aircraft (Servo Hydraulic Actuators (SHA) and Electro Hydrostatic Actuator (EHA)). The simulation results demonstrate that the digital actuator can achieve, for position control, a maximum position error, in a steady-state, of 0.7 mm. From the energy consumption point of view, the digital circuit consumes 31 times less energy when compared with the SHA and 1.7 when compared to the EHA, resulting in an energy efficiency of 54%.

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Section: Digital Hydraulic Actuator Proposedmentioning

confidence: 99%

Multi-Chamber Actuator Using Digital Pump for Position and Velocity Control Applied in Aircraft

Nostrani

Raduenz

Dell’Amico

et al. 2023

TJFP

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“…Many researchers are interested in the modeling, control, and development of hydraulic system components and in obtaining their characteristics. Several control techniques, from classical to intelligent, are applied to control the position, force or speed of these systems [3,6,10,14,[18][19][20]23,[25][26][27]29,30,32,33,[35][36][37][38]40]. Thus, understanding of these subjects, both theoretically and experimentally, plays an important role in engineering education.…”

Section: Introductionmentioning

confidence: 99%

PC‐based control and simulation of an electro‐hydraulic system

Topçu

2017

Comp Applic In Engineering

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This article addresses the development of a control system design methodology to make control courses easier to understand. The methodology can be handled in four stages: Modeling, controller design and tuning of the controller gains, simulation, and experimental studies. A PC‐based control system environment is chosen to help students/researchers understand the control system both theoretically and experimentally. An electro‐hydraulic system is used for training. Such fluid power systems are widely used in the industrial area and combine different engineering system properties. First, a system is defined by a mathematical model and simulated using the MATLAB/Simulink environment. An easy to use toolbox, Simscape/Simhydraulics, is used to facilitate the modeling phase in simulation of the hydraulic system. Next, the design of the feedback controller is proposed. Basic controllers in control education, such as proportional + derivative + integral (PID) and a Fuzzy Logic Controller (FLC), are utilized, and the gains of the controllers are tuned with a simplified method according to the given design criteria. The proposed tuning method can also be useful for overdamped or first‐order systems. Time and frequency responses of the system are obtained and evaluated. The experimental studies are conducted on a hydraulic control system at the Automatic Control Laboratory of the Mechanical Engineering Department of Uludağ University. This work aims to train engineering students/researchers both theoretically and practically regarding PC‐based control system design and fluid power systems.

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“…As discussed in [20] and [21], the required response of a closed loop positioning system can be described by a generic second order time step response. Therefore, assuming a critically damped behavior, the required settling time ( ) can be related to the system natural frequency ( ) by:…”

Section: Figure 4 -Test Rigmentioning

confidence: 99%

Design and Optimization of a Fast Switching Hydraulic Step-Down Converter for Position and Speed Control

Nostrani

Galloni

Raduenz

et al. 2017

Linköping Electronic Conference Proceedings

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This paper presents a design process of a hydraulic step-down switching converter considering the load losses in the inertance tube and switched valve. A steady state analysis for the switching converter as well as nonlinear dynamic simulation results of a digital hydraulic position and speed control system are presented. The results using the steady state and dynamic models are validated by experimental results obtained using a hydraulic test bench able to apply different loads to the system. The results show that steady-state model provides a very good approach to perform the preliminary design of hydraulic switching converters. The impact of tube parameters in the system efficiency is also discussed.

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Effect of Proportional Valves and Cylinders on the Behavior of Hydraulic Positioning Systems

Cited by 4 publications

References 0 publications

Multi-Chamber Actuator Using Digital Pump for Position and Velocity Control Applied in Aircraft

Multi-Chamber Actuator Using Digital Pump for Position and Velocity Control Applied in Aircraft

PC‐based control and simulation of an electro‐hydraulic system

Design and Optimization of a Fast Switching Hydraulic Step-Down Converter for Position and Speed Control

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