A novel pneumatic valve was constructed to improve the response of air-actuated brakes for heavy vehicles to demand pressures generated during electronically controlled braking by an order of magnitude. Investigations were made into the interactions between the magnetic, mechanical, and electrical subsystems of the valve with a view toward informing design optimization. The valve was modeled using a magnetic circuit approach. The quasi-static model included the influences of the permanent magnet, field-line fringing, saturation, and the coil. Mechanical forces outputted by the model matched physical measurements with an error smaller than 10%, and magnetic fluxes throughout the circuit were generally within 20% of those found from experiments based on Faraday's law of induction, Gaussmeter measurements, and FEA simulations. A magneto-mechanical simulation of the valve switching states was created using mechanical and electrical equations, and curve-fits to the outputs of the magnetic circuit model. The simulation produced time histories of the valve's armature position that matched experimental measurements and adequately predicted working pressures. The final model required an approximation to the influence of the coil based on experimental results. Consequently, further research is recommended into the influence of solenoid coils on fringing in magnetic circuits.
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March 2014
Research-Article
Modeling the Magnetic Performance of a Fast Pneumatic Brake Actuator
Jonathan I. Miller,
Jonathan I. Miller
Engineering Department,
Cambridge University
,Trumpington Street
,Cambridge CB2 1PZ
, UK
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Tim J. Flack,
Tim J. Flack
Engineering Department,
Cambridge University
,Trumpington Street
,Cambridge CB2 1PZ
, UK
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David Cebon
David Cebon
1
Engineering Department,
e-mail: dc@eng.cam.ac.uk
Cambridge University
,Trumpington Street
,Cambridge CB2 1PZ
, UK
e-mail: dc@eng.cam.ac.uk
1Corresponding author.
Search for other works by this author on:
Jonathan I. Miller
Engineering Department,
Cambridge University
,Trumpington Street
,Cambridge CB2 1PZ
, UK
Tim J. Flack
Engineering Department,
Cambridge University
,Trumpington Street
,Cambridge CB2 1PZ
, UK
David Cebon
Engineering Department,
e-mail: dc@eng.cam.ac.uk
Cambridge University
,Trumpington Street
,Cambridge CB2 1PZ
, UK
e-mail: dc@eng.cam.ac.uk
1Corresponding author.
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received December 19, 2011; final manuscript received February 24, 2013; published online January 15, 2014. Assoc. Editor: Nariman Sepehri.
J. Dyn. Sys., Meas., Control. Mar 2014, 136(2): 021022 (12 pages)
Published Online: January 15, 2014
Article history
Received:
December 19, 2011
Revision Received:
February 24, 2013
Citation
Miller, J. I., Flack, T. J., and Cebon, D. (January 15, 2014). "Modeling the Magnetic Performance of a Fast Pneumatic Brake Actuator." ASME. J. Dyn. Sys., Meas., Control. March 2014; 136(2): 021022. https://doi.org/10.1115/1.4025813
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