Results 251 to 260 of about 39,915 (300)
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Piston Vibration in Piston-Cylinder Systems
Journal of Fluids Engineering, 1980The motion of a cylindrical piston falling in a liquid filled vertical cylinder is analyzed. It is found that concentric motion is impossible and that flow induced vibration is always associated with such piston-cylinder systems. If the clearance over radius ratio is larger than a certain critical value, βcr, severe wobble and piston-cylinder contact ...
I. Etsion, M. Magen
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2020
A piston compressor containing a housing (8) with a compression chamber (13) in it, having an inlet, and an outlet and a piston (10) arranged movably back and forth in an axial direction (X-X') in the compression chamber (13) between an upper dead point and a lower dead point, delimited by a kinematic mechanism (20) with which the piston (10) is ...
Verrelst, Bjorn, Beckers, Jarl
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A piston compressor containing a housing (8) with a compression chamber (13) in it, having an inlet, and an outlet and a piston (10) arranged movably back and forth in an axial direction (X-X') in the compression chamber (13) between an upper dead point and a lower dead point, delimited by a kinematic mechanism (20) with which the piston (10) is ...
Verrelst, Bjorn, Beckers, Jarl
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Simulation of the Piston and Piston Ring Dynamic
SAE Technical Paper Series, 2001<div class="htmlview paragraph">All reciprocating engines from the first Diesel engine to turbocharged formula 1 engines require a sealing of the combustion chamber. This sealing is realized by the compression rings. Today a set of two compression rings and one oil control ring is standard, the large variety of available solution demonstrate the ...
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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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Study of the piston-rotation technique for piston-cylinder devices
Review of Scientific Instruments, 1978In piston-cylinder studies of reconstructive phase transitions, piston rotation plays a more subtle role than has previously been thought. Rotation of the piston not only relieves sliding friction, but also helps to activate sluggish transformations.
A B, Wolbarst, J B, Clark, P W, Richter
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A self-deactivating piston for a piston corer
Ocean Engineering, 1970Abstract Described is a piston containing an internal valve that is closed during penetration and open during extraction of the corer. It requires no cocking or other preparatory steps before use, and prevents liner collapse, core distortion, and consequent erroneous interpretation of the core materials as sometimes occurs when a conventional piston ...
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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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Effect of Piston and Piston Ring Designs on the Piston Friction Forces in Diesel Engines
SAE Technical Paper Series, 1981<div class="htmlview paragraph">How much reduction in piston friction loss can be achieved by the piston design?</div> <div class="htmlview paragraph">Piston friction force measurements have been carried out using the measuring method developed by the authors to obtain the effects of piston clearance, surface roughness, lubricant and ...
Shoichi Furuhama +2 more
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On the piston problem in gasdynamics
Mechanics Research Communications, 1984In a preceding paper [The moving load on a string as free boundary problem (to be published)] the author treated a free boundary problem concerning the moving load on a string; now he uses his method to the resolution of this typical example of a free boundary problem in gasdynamics.
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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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