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Tolerance Analysis of Test Mass Alignment Errors for Space-Based Gravitational Wave Detection. [PDF]
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Constraint enforcement of piston motion in a free-piston engine
2014 American Control Conference, 2014Precise control of piston turnaround location is essential for reliable free-piston engine (FPE) operation. In this paper we derive a discrete-time, control-oriented, implicit model that describes FPE clearance height behavior by applying an energy balance to the Otto cycle.
Kevin Zaseck +2 more
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On the Piston Motion of a Free-Piston Shock Tube
Aeronautical Quarterly, 1965SummaryThe motion of a solid piston between the driver and test gases in a closed shock tube is studied. In particular, the piston stopping distance, i.e. the total length required to bring the piston to a stop, is calculated for various experimental conditions. Before the stop, the moving piston compresses the test gas, at first with its induced shock
Tzy C. Peng, Theo. F. Elbert
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A two-stage free-piston driver
Shock Waves, 1999The overall cost of free-piston driven facilities can be substantially reduced if the contraction between the compression and shock tubes is replaced with a constant area section. However, with such an implementation, a new driver concept is required in order to achieve a realistic facility length. This paper describes a new free-piston driver type for
Doolan, C. J., Morgan, R. G.
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Hybrid simulation of a free piston engine
Proceedings of the April 26-28, 1966, Spring joint computer conference on XX - AFIPS '66 (Spring), 1966The free piston engine principle is one which has intrigued mechanical engineers for decades. Indeed, the original gas engine of Otto and Langden employed a piston assembly which did not contain the now conventional connecting rod and camshaft arrangement and hence may be considered as an early implementation of the free piston principle.
R. E. Gagne, E. J. Wright
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Precise piston trajectory control for a free piston engine
Control Engineering Practice, 2015Abstract A free piston engine removes the mechanical constraint on the piston motion by eliminating the crankshaft. The extra degree of freedom offers many advantages for reducing fuel consumption and emissions. Nevertheless, stability and robustness of the engine operation has been affected in the meantime.
Ke Li, Chen Zhang, Zongxuan Sun
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Tribological characteristics of piston rings in a single-piston hydraulic free-piston engine
Industrial Lubrication and Tribology, 2017Purpose A free-piston engine (FPE) is an unconventional engine that abandons the crank system. This paper aims to focus on a numerical simulation for the lubricating characteristics of piston rings in a single-piston hydraulic free-piston engine (HFPE).
Zhaoju Qin +3 more
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Piston-retardation insert in a free-piston compressor
AIAA Journal, 1970The complete solution, expressed in terms of Eqs. (7, 10> and 11), gives the temperature profile along the fin in terms of the radiation-conduction parameter e, convection parameter (Biot modulus) X, environment temperature Oe, and fin geometry v.
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Free-Piston Stirling Cryocoolers
1985A cryocooler is a device used to produce refrigeration at very low temperatures in the cryogenic range, 0 to 120 K.
Graham Walker, J. R. Senft
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ASME 2009 Dynamic Systems and Control Conference, Volume 2, 2009
A dynamic model of a free liquid piston that exploits piston geometry to produce a high inertance was developed for use in a free piston engine compressor. It is shown that for the size scale targeted, advantageous piston dynamics can be achieved with a reduced piston mass compared to a rigid piston design.
Joel A. Willhite, Eric J. Barth
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A dynamic model of a free liquid piston that exploits piston geometry to produce a high inertance was developed for use in a free piston engine compressor. It is shown that for the size scale targeted, advantageous piston dynamics can be achieved with a reduced piston mass compared to a rigid piston design.
Joel A. Willhite, Eric J. Barth
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