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Research Papers

A Novel in Field Method for Determining the Flow Rate Characteristics of Pneumatic Servo Axes

[+] Author and Article Information
Paolo Righettini

Department of Engineering,
University of Bergamo,
Dalmine 24044, Italy
e-mail: paolo.righettini@unibg.it

Hermes Giberti

Mechanical Department,
Politecnico di Milano,
Milano 20156, Italy
e-mail: hermes.giberti@polimi.it

Roberto Strada

Department of Engineering,
University of Bergamo,
Dalmine 24044, Italy
e-mail: roberto.strada@unibg.it

Contributed by the Dynamic Systems Division of ASME for publication in the Journal of Dynamic Systems, Measurement, and Control. Manuscript received May 25, 2012; final manuscript received March 6, 2013; published online May 21, 2013. Assoc. Editor: Evangelos Papadopoulos.

J. Dyn. Sys., Meas., Control 135(4), 041013 (May 21, 2013) (8 pages) Paper No: DS-12-1182; doi: 10.1115/1.4024010 History: Received May 25, 2012; Revised March 06, 2013

Several strategies, in order to improve an actuator's control and to increase the bandwidth, consider the relationship between the valve's driving signal and the air flow rate. Such an approach to the control strategy takes advantage of the evaluation of the valve's characteristic parameter, known as sonic conductance. The sonic conductance can be measured following the procedure stated by the standard ISO 6358. Nevertheless, the measurement carried out according to this standard is very expensive in terms of time and air consumption. In this paper, an alternative method to evaluate the sonic conductance is presented. The method is based on a new practical approach: the sonic conductance is evaluated leaving the valve mounted on the actuator and using only the piston's position transducer. The steady state piston's motion allows us to determine the sonic conductance. The new approach allows us to get the conductance in a very short time, without the need to use a proper test bench and pressure transducers. Moreover, performing the measurements directly on the pneumatic axis allows us to characterize not only the valve but the duct connecting the valve to the actuator's chamber too.

Copyright © 2013 by ASME
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References

Messina, A., Giannoccaro, N., and Gentile, A., 2005, “Experimenting and Modelling the Dynamics of Pneumatic Actuators Controlled by the Pulse Width Modulation (PWM) Technique,” Mechatronics, 15, pp. 859–881. [CrossRef]
Hodgson, S., Le, M., Tavakoli, M., and Pham, M. T., 2012, “Improved Tracking and Switching Performance of an Electro-Pneumatic Positioning System,” Mechatronics, 22, pp. 1–12. [CrossRef]
Carneiro, J., and de Almeida, F., 2012, “A Neural Network Based Nonlinear Model of a Servopneumatic System,” ASME J. Dyn. Sys., Meas., Control, 134(2), p. 024502. [CrossRef]
Shen, X., and Goldfarb, M., 2007, “Simultaneous Force and Stiffness Control of a Pneumatic Actuator,” ASME J. Dyn. Sys., Meas., Control, 129(4), pp. 425–434. [CrossRef]
Tsai, Y., and Huang, A., 2008, “Multiple-Surface Sliding Controller for Pneumatic Servo Systems,” Mechatronics, 18, pp. 506–512. [CrossRef]
Xiang, F., and Wikander, J., 2004, “Block-Oriented Approximate Feedback Linearization for Control of Pneumatic Actuator System,” Control Eng. Pract., 12, pp. 387–399. [CrossRef]
Al-Dakkan, K., Barth, E., and Goldfarb, M., 2006, “Dynamic Constraint-Based Energy-Saving Control of Pneumatic Servo Systems,” ASME J. Dyn. Sys., Meas., Control, 128(3), pp. 655–662. [CrossRef]
Shen, X., Zhang, J., Barth, E., and Goldfarb, M., 2006, “Nonlinear Model-Based Control of Pulse Width Modulated Pneumatic Servo Systems,” ASME J. Dyn. Sys., Meas., Control, 128(3), pp. 663–669. [CrossRef]
Lee, H., Choi, G., and Choi, G., 2002, “A Study on Tracking Position Control of Pneumatic Actuators,” Mechatronics, 12, pp. 813–831. [CrossRef]
Moore, P., and Pu, J., 1996, IEE Colloquium Actuator Technology: Current Practice and New Developments, IEEE, London.
Brun, X., Belgharbi, M., Sesmat, S., Thomasset, D., and Scavarda, S., 1999, “Control of an Electropneumatic Actuator: Comparison Between Some Linear and Nonlinear Control Laws,” J. Syst. Control Eng., 213, pp. 387–406. [CrossRef]
ISO, 1989, ISO 6358 Pneumatic Fluid Power-Components Using Compressible Fluids Determination of Flow-Rate Characteristics, ISO, Genève, Switzerland.
Jungong, M., Juan, C., Ke, Z., and Mitsuru, S., 2008, “Determination of Flow Rate Characteristics of Pneumatic Solenoid Valves Using an Isothermal Chamber,” Proceedings of the IEEE International Conference on Automation and Logistics.
Delas Heras, S., 2001, “A New Experimental Algorithm for the Evaluation of the True Sonic Conductance of Pneumatic Components Using the Characteristic Unloading Time,” Int. J. Fluid Power, 2(1), pp. 17–24.
Kawashima, K., Ishii, Y., Funaki, T., and Kagawa, T., 2004, “Determination of Flow Rate Characteristics of Pneumatic Solenoid Valves Using an Isothermal Chamber,” ASME J. Fluids Eng., 126(2), pp. 273–279. [CrossRef]
Kuroshita, K., and Oneyama, N., 2004, “Improvements of Test Method of Flow-Rate Characteristics of Pneumatic Components,” SICE Annual Conference, Sapporo, Japan.
Martinelli, M., and Viktorov, V., 2010, “A Fast Method for Determining the Flow Conductance of Gas Microfluidic Devices,” ASME J. Fluids Eng., 132(12), p. 121401. [CrossRef]
ISO, 2011, ISO/DIS 6358-2.3 Pneumatic Fluid Power – Determination of Flow-Rate Characteristics of Components—Part 2: Alternative Test Methods, ISO, Genève, Switzerland.
Wang, T., Peng, G., and Kagawa, T., 2010, “Determination of Flow-Rate Characteristics for Pneumatic Components Using a Quasi-Isothermal Tank With Temperature Compensation,” Meas. Sci. Technol., 21, p. 065402. [CrossRef]
Wei, Z., Qian, Y., and Guo-Xiang, M., 2011, “Measurement of Flow Rate Characteristics of Pneumatic Components Based on the Dynamic Regularity of Polytropic Exponents,” Flow Meas. Instrum., 22, pp. 331–337. [CrossRef]
Qian, Y., Wei, Z., and Guo-Xiang, M., 2011, “A New Algorithm for Identification of Flow-Rate Characteristics of Pneumatic Solenoid Valves—Based on the Isothermal Discharge Method,” Proceedings of the 2011 International Conference on Fluid Power and Mechatronics (FPM). [CrossRef]
Qian, Y., and Guo-Xiang, M., 2008, “Identification of the Flow-Rate Characteristics of a Pneumatic Valve by the Instantaneous Polytropic Exponent,” Meas. Sci. Technol., 19, p. 057002. [CrossRef]
Szente, V., and Vad, J., 2003, “A Semi-Empirical Model for Characterisation of Flow Coefficient for Pneumatic Solenoid Valves,” Period. Polytech. Mech. Eng.-Masinostr., 47(2), pp. 131–142. [CrossRef]
Olaby, O., Brun, X., Sesmat, S., Redarce, T., and Bideaux, E., 2005, “Characterization and Modeling of a Proportional Valve for Control Synthesis,” Proceedings of the 6th JFPS International Symposium on Fluid Power.
Belforte, G., Raparelli, T., and Sorli, M., 1984, “Modelli di Circuito con Attuatori Pneumatici,” AIMETA VII Congresso Nazionale.
Belforte, G., 1987, Pneumatica, Tecniche Nuove, Milano.
ISO, 2003, ISO 8778 Pneumatic Fluid Power - Standard Reference Atmosphere, ISO, Genève, Switzerland.
Karnopp, D., 1985, “Computer Simulation of Stick-Slip Friction in Mechanical Dynamic Systems,” ASME J. Dyn. Sys., Meas., Control, 107(1), pp. 100–103. [CrossRef]

Figures

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Fig. 1

ISO 6358 test rig scheme

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Fig. 2

5/3 proportional directional flow control valve

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Fig. 3

Operational scheme of a pneumatic axis

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Fig. 4

Test rig according to ISO 6358

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Fig. 5

2–3 duct's conductance versus command signal, according to ISO 6358 method

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Fig. 6

Temperature behavior during a set of tests

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Fig. 8

Position versus time (dark lines) and slopes at the stroke's end (light lines)

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Fig. 9

Piston's velocity versus position (black lines) and slopes at the stroke's end (gray lines)

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Fig. 10

Downstream/upstream pressure ratio versus position

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Fig. 11

ΔP versus piston's position

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Fig. 12

Pressure versus piston's position

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Fig. 13

Comparison between the terms of inequality in Eq. (19); P·/P (black lines), (Ax·)/(Ax + V*) (gray lines)

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Fig. 14

Steady state velocity method versus ISO method

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Fig. 15

Percentage variation with respect to ISO method

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