DESIGN, FABRICATION, AND EVALUATION OF A DISTRIBUTED PISTON STRAIN-ENERGY ACCUMULATOR

Authors

  • John M. Tucker Laboratory for the Design and Control of Energetic Systems Department of Mechanical Engineering – Vanderbilt University, Nashville, Tennessee
  • Eric J. Barth Laboratory for the Design and Control of Energetic Systems Department of Mechanical Engineering – Vanderbilt University, Nashville, Tennessee

Keywords:

Strain-energy storage, hydraulic accumulator, elastomerics

Abstract

By utilizing multiple energy domains, hybrid vehicles seek to harness the strengths of each domain in order to make up for the weaknesses of the other. Hydraulic hybrids in particular offer a solution to regenerative braking that exploits the power density, transmission flexibility, and rugged efficiency that hydraulic technology offers. Hydraulic regeneration utilizing an accumulator is not hampered by the relatively low power density of electric batteries, and offers greater opportunity for safer, more distributed storage than strictly mechanical regeneration techniques. This paper presents the design and experimental results-based projected performance of a distributed piston strain energy accumulator. By storing energy as strain energy in a material, strain energy accumulators offer the potential of increased energy density, efficiency and lower maintenance over gas-charged accumulators. Material selection for a strain energy accumulator is discussed for polyurethane materials with regard to hyperelastic behavior, Mullins effect and hysteresis. Experimental testing of polyurethane bladders and uniaxial tension specimens is presented, with the highest performers showing 15 kJ/l with 17 % loss hysteresis. Design tradeoffs for different configurations of a strain energy accumulator is presented, with a detailed analysis of a distributed piston elastomeric accumulator (DPEA). A prototype DPEA accumulator was constructed and experimentally evaluated with two different polyurethane materials. These experimental results are then utilized to project a full scale device with regard to its overall system energy density. These projections are compared to an idealized gas-charged accumulator.

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Author Biographies

John M. Tucker, Laboratory for the Design and Control of Energetic Systems Department of Mechanical Engineering – Vanderbilt University, Nashville, Tennessee

Eric J. Barth received the B. S. degree in engineering physics from the University of California at Berkeley, and the M. S. and Ph. D. degrees from the Georgia Institute of Technology in mechanical engineering in 1994, 1996, and 2000 respectively. He is currently an associate professor of mechanical engineering at Vanderbilt University, Nashville, TN and director of the Laboratory for the Design and Control of Energetic Systems. His research interests include the design, modeling and control of mechatronic and fluid power systems, energy storage, energy harvesting, power supply and actuation for autonomous robots, and MRI compatible robots.

Eric J. Barth, Laboratory for the Design and Control of Energetic Systems Department of Mechanical Engineering – Vanderbilt University, Nashville, Tennessee

John M. Tucker received the B.S. and M.S. degrees in mechanical engineering from Vanderbilt University in 2010 and 2012 respectively. His research interests include mechanical design, mechatronic systems, and energy storage devices. He is currently employed as a technical support engineer for Laird Technologies, EMI Division, in Saint Louis, MO.

References

Ashby, M. F., Materials Selection in Mechanical Design,

Pergamon, Oxford, 1992.

CES Selector ver. 4.8.0. Granta Design Limited. Build

, 2, 29, 1.

Diani, J., Fayole, B. and Gilormini, P. “A review on

the Mullins effect” European Polymer Journal. Volume

Issue 3. March 2009 (pages 601 - 612)

Li, P., Van De Ven, J. D. and Sancken, C., “Open

Accumulator Concept for Compact Fluid Power

Storage,” Proceedings of the ASME International

Mechanical Engineering Congress and Exposition,

IMECE 2007, vol. 4, pp. 127-140, 2007.

Otte, B., Stelling, O. and Müller, C., “High Pressure

Lightweight Hydraulic Fully Composite Piston Accumulators”

Proceedings of the 8th International

Fluid Power Conference, Dresden, 2012.

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Published

2018-12-30

How to Cite

Tucker, J. M., & Barth, E. J. (2018). DESIGN, FABRICATION, AND EVALUATION OF A DISTRIBUTED PISTON STRAIN-ENERGY ACCUMULATOR. International Journal of Fluid Power, 14(1). Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/227

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Original Article