A comparative study between two control laws of an electropneumatic actuator

Brun, Xavier; Sesmat, Sylvie; Thomasset, Daniel; Scavarda, Serge

doi:10.23919/ecc.1999.7099780

Cited by 32 publications

(41 citation statements)

References 3 publications

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“…The viscous friction coefficient value has been identified and the variation of this coefficient around the nominal value has been experimentally evaluated at 30%. The mass flow rate delivered by each servodistributor has been approximated by polynomial functions (2). The uncertainties on jð:Þ and cð:Þ are evaluated to 30 and 15%, respectively.…”

Section: Electropneumatic System Modellingmentioning

confidence: 99%

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High‐order sliding mode for an electropneumatic system: A robust differentiator–controller design

Smaoui

Brun

Thomasset

2007

Intl J Robust & Nonlinear

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SUMMARYThis paper deals with the robust control problem of a pneumatic actuator subject to parameter uncertainties and load disturbances. The control strategies are based on second-and third-order sliding mode approaches. These controllers require measurements of acceleration for feedback. However, accelerometer is seldom used in practical drive systems, because of the complexity they add to the overall process as they are mounted to the load in displacement. For this, a robust differentiator via sliding mode is used to estimate the acceleration. A comparative study between the robust differentiator and a classical one is presented. Implementation results of the proposed sliding mode differentiator-controller design on an experimental set-up are given to illustrate the developments.

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Section: Electropneumatic System Modellingmentioning

confidence: 99%

“…Most of them have been in the field of feedback linearization [2,3]. However, reasonably accurate mathematical models for the pneumatic system are required by the feedback linearization.…”

Section: Introductionmentioning

confidence: 99%

High‐order sliding mode for an electropneumatic system: A robust differentiator–controller design

Smaoui

Brun

Thomasset

2007

Intl J Robust & Nonlinear

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“…A pneumatic servo-valve model may be partitioned When using pneumatic cylinders for servo-control, into two parts: a dynamic part for the spool and deviations of temperature from their equilibrium its actuator motion and a static part for the mass values are less pronounced but are not, as usually flow stage [9]. The bandwidth of the servo-valve is considered in the literature, negligible.…”

Section: Introductionmentioning

confidence: 99%

“…This fact was typically much higher than the bandwidth of the experimentally observed in reference [13], where the pneumatic actuator. The bandwidth of the system is temperature inside the discharging chamber of a therefore not limited by the servo-valve and conpneumatic cylinder was measured in a meter-out sequently its dynamics are often neglected [9]. This velocity control set-up.…”

Section: Introductionmentioning

confidence: 99%

“…process). [7][8][9][10] where, although the pressure is inappropriate for control purposes since it is dynamic model is deduced assuming that the temmathematically difficult to handle and demands a perature follows a polytropic law, a further simplifimass or temperature observer as these variables cation in this model is introduced by neglecting cannot be correctly measured during operation.…”

Section: Introductionmentioning

confidence: 99%

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Reduced-Order Thermodynamic Models for Servo-Pneumatic Actuator Chambers

Carneiro¹,

Almeida

2006

Proceedings of the Institution of Mechanical Engineers, Part I:

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This paper discusses thermodynamic models of air inside pneumatic actuator chambers. In servo-pneumatics common practice, these models are simplified by neglecting the temperature dynamics. Classical models in the literature assume the temperature inside the pneumatic chamber either to be constant or to follow a polytropic law. Furthermore, the mixing process of air entering the chamber and heat transfer between air and cylinder walls is often neglected or only implicitly taken into account.This work evaluates the impact of these simplifications and order reductions in the prediction of pressure inside the actuator chamber. Classical models are compared with several others not only taking into account the mixing process but also explicitly including the heat transfer between air and cylinder walls. Simulation studies show that the reduced-order models proposed in this paper can lead to a mean square error in pressure prediction of only 10 per cent of that obtained using classical models.Keywords: servo-pneumatic systems modelling, servo-pneumatic systems simulation INTRODUCTIONis to neglect temperature dynamics and to consider a polytropic process with an index ranging from In order to control a pneumatic actuator accurately, a 1 (isothermal process) to 1.4 (adiabatic reversible model of the pneumatic system has to be established. process). [7][8][9][10] where, although the pressure is inappropriate for control purposes since it is dynamic model is deduced assuming that the temmathematically difficult to handle and demands a perature follows a polytropic law, a further simplifimass or temperature observer as these variables cation in this model is introduced by neglecting cannot be correctly measured during operation.temperature changes with respect to ambient temServo-pneumatic systems are used in applications perature. This approach leads to a situation where where force or motion control is required. In both the polytropic index of pressure dynamics is tuneable situations the pressure inside the chambers is the but the temperature is fixed at ambient temperature. most relevant thermodynamic state variable since More recently, a new approximate model of a the control goals directly depend on it. Therefore, the pneumatic cylinder thermodynamic chamber was most typical solution to reduce the order of the model proposed in reference [11]; based on experimental evidence presented in reference [12], Richer and Hurmuzlu [11] use a polytropic-based model whose

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System Identification with piecewise linear models in the frequency domain – application to an servopneumatic actuator

Schulte

2002

Proc. Appl. Math. Mech.

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By means of a real world application a system identification method was investigated for nonlinear systems from input-output measurements. This approach is based on a blended multiple model structure, which describes the global behaviour of the system over the whole operating range. Depending on the operating point twenty local linear blackbox models were identified in the frequency domain from a finite number of measurements of the inputs and outputs. A comparative study was made of a model, which have been derived using physical laws [4] and measurements of several process states to estimate unknown parameters.

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A comparative study between two control laws of an electropneumatic actuator

Cited by 32 publications

References 3 publications

High‐order sliding mode for an electropneumatic system: A robust differentiator–controller design

High‐order sliding mode for an electropneumatic system: A robust differentiator–controller design

Reduced-Order Thermodynamic Models for Servo-Pneumatic Actuator Chambers

System Identification with piecewise linear models in the frequency domain – application to an servopneumatic actuator

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