Free piston engine compressors have recently been investigated for the purpose of providing a high pressure air supply for untethered, pneumatically actuated robotic systems. Given that free piston engine performance is highly dependent on the dynamic characteristics of the piston, this paper presents the idea of incorporating a liquid piston whose geometry can be manipulated to achieve the desired piston dynamics while maintaining the compactness and light weight necessary for applications in the power output range of 100 W. An inertance-based dynamic model of the liquid piston is developed and validated experimentally. The piston model is incorporated into a complete system dynamic model of a proposed high inertance free liquid piston compressor (HIFLPC). Critical model parameters for individual components and subsystems of a proposed HIFLPC prototype are experimentally characterized. Simulation results for the proposed prototype are shown and discussed.
The High Inertance Free Piston Engine Compressor—Part I: Dynamic Modeling
Contributed by the Dynamic Systems Division of ASME for publication in the Journal of Dynamic Systems, Measurement, and Control. Manuscript received March 18, 2011; final manuscript received January 17, 2013; published online April 29, 2013. Assoc. Editor: Nabil Chalhoub.
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Willhite, J. A., Yong, C., and Barth, E. J. (April 29, 2013). "The High Inertance Free Piston Engine Compressor—Part I: Dynamic Modeling." ASME. J. Dyn. Sys., Meas., Control. July 2013; 135(4): 041003. https://doi.org/10.1115/1.4023759
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