Approaching Servoclass Tracking Performance by a Proportional Valve-Controlled System

Sarkar, Bikash Kumar; Das, J. C.; Saha, Rana; Mookherjee, Saikat; Sanyal, Debarshi Kumar

doi:10.1109/tmech.2013.2253116

Cited by 49 publications

(30 citation statements)

References 14 publications

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“…The major contribution of the current work is explicit understanding of the contributions, especially in the areas involving modeling of the valve characteristics, actuator friction, and end-cushioning. Control with combining PID and feedforward strategy [28] was also developed on the same setup.…”

Section: Discussionmentioning

confidence: 99%

Nonlinear modeling of an electrohydraulic actuation system via experiments and its characterization by means of neural network

Das

Mishra

Saha

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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The friction and end-cushioning effects in the actuator have been taken care in consideration in the modeling of the actuation method related to an electrohydraulic system. A much simpler friction model that retains all the features of the existing models has been developed for this purpose. In addition, a systematic experimental characterization procedure has been proposed that has been utilized in a supplementary manner for the development of the elaborate nonlinear system model. An artificial neural-network model has been constructed by training with experimental data keeping in mind the variation of discharge through the proportional valve with pressure and command signal. All the nonlinear subsystem models thus obtained have been incorporated simultaneously in MATLAB/SIMULINK to monitor the actuation dynamics. The variations of the theoretical and investigated (via experiments) displacements of the piston against different command signals have been found to be quite close to each other. Keywords Electrohydraulics Á Hydraulic system modeling Á Identification Á Artificial neural network Á Simulation List of symbols A a Cross-sectional area of actuator piston, (m 2) A p Cross-sectional area of flow in pipe, (m 2) C d Coefficient of discharge C vi (i = 1-4) Main-flow coefficient corresponding to the pressure drop DPi, (m 3 /(VPa 1/2)) d b Actuator bore diameter, (m) d c Cushion rod diameter, (m) d o Cushion bush diameter, (m) d r Actuator piston rod diameter, (m) E Error between measured output value t k and the network predicted value y k e f Feed forward voltage (V) F f Frictional force (N) f RV (Q s), f NRV (Q r) Pressure-discharge characteristics for the relief valve and nonreturn valve, respectively, (Pa) K s Spring constant, (N/m) l b Inner length of actuator cylinder, (m) l c Length of cushion rod, (m) l l Lip length between cushion rod and actuator piston rod, (m) l p-s Pipe length between pump delivery and the supply port of PV, (m) l v1-a1 Pipe length between PV and chamber 1 of actuator, (m) l v2-a2 Pipe length between PV and chamber 2 of actuator, (m) l r-n Pipe length between NRV and the return port of PV, (m) m a Moving mass of the actuator, (kg) P A , P B Pressures at the two control ports A and B of the PV, respectively, (Pa) P c1 , P c2 Cushioning volume pressures in chambers 1 and 2, respectively, (Pa) P n Pressures at the return port of PV and inlet to the NRV, respectively, (Pa) P p Pressures at the pump exit and inlet to the PV, respectively, (Pa)

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Section: Discussionmentioning

confidence: 99%

Nonlinear modeling of an electrohydraulic actuation system via experiments and its characterization by means of neural network

Das

Mishra

Saha

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

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“…The wind loading system is employed to impose the equivalent wind turbine loading torque upon the rotor blades to accurately simulate the realistic wind loading scenario. This loading system is basically composed of a set of valve-controlled single-rod hydraulic cylinders (Kim, Won, & Tomizuka, 2014, Sarkar, Das, & Saha, 2013 that are controlled by the target computer to exert the turbine resistive torque to the blades. The target computer is used to control the wind rotor and to impose the wind loading torque to the turbine blades.…”

Section: Methodsmentioning

confidence: 99%

Adaptive back-stepping pitch angle control for wind turbine based on a new electro-hydraulic pitch system

Yin

Lin

et al. 2015

International Journal of Control

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A new electro-hydraulic pitch system is proposed to smooth the output power and drive-train torque fluctuations for wind turbine. This new pitch system employs a servo-valve-controlled hydraulic motor to enhance pitch control performances. This pitch system is represented by a state-space model with parametric uncertainties and nonlinearities. An adaptive backstepping pitch angle controller is synthesised based on this state-space model to accurately achieve the desired pitch angle control regardless of such uncertainties and nonlinearities. This pitch angle controller includes a back-stepping procedure and an adaption law to deal with such uncertainties and nonlinearities and hence to improve the final pitch control performances. The proposed pitch system and the designed pitch angle controller have been validated for achievable and efficient power and torque regulation performances by comparative experimental results under various operating conditions.

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“…Generally, a proportional pressure-reducing valvecontrolled hydraulic actuator is used to change the thickness h by maintaining the necessary chamber pressure of the actuator P C , which can be predetermined by the control command. The hydraulic fluid flow can be supplied by an electric motor-driven hydraulic motor with constant pressure [15], [16]. Furthermore, the hydraulic oil can also be employed to dissipate the thermal energy caused by the shearing stresses and to lubricate the surfaces of such rotating discs so as to preclude the temperature rise and skin friction.…”

Section: System Configuration and Designmentioning

confidence: 99%

Operating Modes and Control Strategy for Megawatt-Scale Hydro-Viscous Transmission-Based Continuously Variable Speed Wind Turbines

Yin

Lin

2015

IEEE Trans. Sustain. Energy

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A megawatt (MW)-scale hydro-viscous transmissionbased continuously variable speed wind turbine is proposed to guarantee a smooth transition among different operating regions and hence to improve power efficiency and quality. This turbine is achieved by highly integrating a hydro-viscous element into the turbine drive-train to mitigate the upstream wind-loading fluctuations. This element allows the turbine speed to be directly regulated by continuously changing the oil film thickness in this element. Three important operating modes of this turbine system are proposed. The control-oriented drive-train model is also established and validated based on experimental data. A cooperative control strategy over the full operating range is then proposed based on such modes. A series of comparative cosimulations are carried out to evaluate the stability and effectiveness of the proposed turbine system in speed and power regulations. This proposed system holds several advantages such as large power capacity, high efficiency, downsized power converters, and low cost. Such advantages make this turbine system particularly attractive and promising for medium-to-large-scale wind power applications.Index Terms-Continuously variable speed wind turbines, control-oriented modeling, cooperative control strategy, hydroviscous element, operating modes. 1949-3029

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Approaching Servoclass Tracking Performance by a Proportional Valve-Controlled System

Cited by 49 publications

References 14 publications

Nonlinear modeling of an electrohydraulic actuation system via experiments and its characterization by means of neural network

Nonlinear modeling of an electrohydraulic actuation system via experiments and its characterization by means of neural network

Adaptive back-stepping pitch angle control for wind turbine based on a new electro-hydraulic pitch system

Operating Modes and Control Strategy for Megawatt-Scale Hydro-Viscous Transmission-Based Continuously Variable Speed Wind Turbines

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