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Technical Briefs

Dynamic Analysis of a Complex Pneumatic Valve Using Pseudobond Graph Modeling Technique

[+] Author and Article Information
Amir Zanj

Ph.D. Candidate
Department of Mechanical Engineering,
Flinders University,
Adelaide 5001, Australia

Hamed Hossein Afshari

Ph.D. Candidate
Department of Mechanical Engineering,
McMaster University,
Hamilton, ON, L8S 4L7, Canada

Contributed by the Dynamic Systems Division of ASME for publication in the Journal of Dynamic Systems, Measurement, and Control. Manuscript received July 18, 2010; final manuscript received January 16, 2013; published online March 28, 2013. Assoc. Editor: Marco P. Schoen.

J. Dyn. Sys., Meas., Control 135(3), 034502 (Mar 28, 2013) (9 pages) Paper No: DS-10-1212; doi: 10.1115/1.4023666 History: Received July 18, 2010; Revised January 16, 2013

In this work, the dynamic behaviors of a complex pneumatic reducer valve have been studied through the pseudobond graph modeling technique. This modeling approach graphically describes the energy and mass flows among pneumatic valve components during real operational conditions. State equations have been derived from the pseudobond graph model and have been numerically solved by matlab-Simulink. To validate the accuracy of the model, simulation results are compared with the real data of an experimental setup and good agreements between them are reported. The main advantage of the proposed model over other conventional approaches such as fluid dynamics theories is that it provides a physical model which accurately predicts the system's dynamic responses without any need to run huge computer programs or establish expensive experimental setups.

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References

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Figures

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Fig. 1

A 3-dimensional representation of the pneumatic valve cross-section

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Fig. 2

A 2-dimensional technical drawing of the pneumatic reducer valve

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Fig. 9

Profile of the gas inlet pressure passing into chamber (3)

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Fig. 8

Profile of the gas temperature in different chambers

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Fig. 7

Profiles of the gas flow rate in the pneumatic valve

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Fig. 11

Comparison of the simulated and real outlet pressure

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Fig. 12

Comparison of the simulated and real outlet mass flow

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Fig. 6

Profile of the control orifice cross-sectional area

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Fig. 5

Profiles of the gas pressure in different chambers

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Fig. 4

Block-diagram of the solution procedure in the Matlab-Simulink environment

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Fig. 3

Pseudobond graph model of the pneumatic reducer valve

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Fig. 10

A schematic diagram of the experimental setup

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