Design optimization of a hydraulic flywheel accumulator for a hydraulic hybrid vehicle

Kyle G. Strohmaier, Paul M. Cronk, James D Van De Ven

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The hydraulic flywheel accumulator is a novel energy storage device that has the potential to overcome major drawbacks of conventional energy storage methods for mobile hydraulic systems. By employing a rotating pressure vessel, the hydraulic flywheel accumulator stores energy in both the hydro-pneumatic domain and the rotating kinetic domain. This allows for energy storage densities many times higher than conventional hydraulic accumulators and adds a degree of freedom that decouples state of charge from the hydraulic system pressure. This paper summarizes various mechanical stress and energy models developed to describe the behavior of the hydraulic flywheel accumulator. The models are used in an example design optimization to illustrate the utility of the hydraulic flywheel accumulator. The resulting design solution delivers an energy storage density at least six times greater than traditional composite hydraulic accumulators while exhibiting efficiencies above 75%.

Original languageEnglish (US)
Pages (from-to)149-161
Number of pages13
JournalInternational Journal of Fluid Power
Issue number3
StatePublished - Sep 2 2015


  • HFA
  • dual energy storage domain
  • hydraulic energy storage
  • hydraulic flywheel accumulator
  • kinetic energy storage


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