Bistable fluid jet amplifier with low sensitivity to receiver reverse flow
Bistable fluid jet amplifier with low sensitivity to receiver reverse flow
BISTABLE AMPLIFIER↗
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Results for “BISTABLE AMPLIFIER”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Controlling subsynchronous whirl in turbopumps
Active fluidic dampers are proposed for controlling turbopump-shaft whirl. Study indicates that linear variable-bleed detector and linear bistable amplifier are effective in supplying sizable controlled damping forces. Linear bistable device was considered as simplest and most adequate.
Black, M. D.↗
Experimental scaling study of fluid amplifier elements Final report
Scaling parameters of three fluid amplifier elements - bistable, boundary layer control, and vortex devices
BOUNDARY LAYER CONTROL↗
Dual current readout for precision plating
Bistable amplifier prevents damage in the low range circuitry of a dual scale ammeter. It senses the current and switches automatically to the high range circuitry as the current rises above a preset level.
Iceland, W. F.↗
Fluid thrust control system
A pure fluid thrust control system is described for a pump-fed, regeneratively cooled liquid propellant rocket engine. A proportional fluid amplifier and a bistable fluid amplifier control overshoot in the starting of the engine and take it to a predetermined thrust. An ejector type pump is provided in the line between the liquid hydrogen rocket nozzle heat exchanger and the turbine driving the fuel pump to aid in bringing the fluid at this point back into the regular system when it is not bypassed. The thrust control system is intended to function in environments too severe for mechanical controls.
Howell, W. L.↗
FET comparator detects analog signal levels without loading analog device
FET comparator circuit detects discrete analog computer output levels without excessively loading the output amplifier of the computer. An FET common source amplifier is coupled by a differential amplifier to a bistable transistor flip-flop. This circuit provides a digital output for analog voltages above or below a predetermined level.
Wallace, H. L.↗
Experimental scaling study of fluid amplifier elements
Study examines scaling parameters of three fluid amplifier elements - a bistable device, a boundary layer control device, and a vortex device. Variations in performance due to size, fluid, and other conditions are studied. Even with restricted examples the large number of variables impedes the establishment of these scaling laws.
Abler, J.↗
Can El Nino Amplify the Solar Forcing of Climate?
ENSO (El Nino and the Southern Oscillation) is considered as a stochastic driver that excites the atmospheric anomaly states, such as Pacific North American pattern. This can make the 11 year solar activity forcing feasible to climate through stochastic resonance -- a phenomenon that amplifies a weak input to a nonlinear bistable system by the assistance of noise.
ENSO El Nino Oscillation climate stochastic resona↗
Study of mid IR fiber transmission and mode patterns under laser induced stimulated Brillouin scattering
Mid IR fiber transmission and exit radiation mode patterns at various incident CO2 laser power levels appear to be effective diagnostic tools for monitoring laser induced stimulated Brillouin scattering in various mid IR fibers. Such processes are deemed to be essential mechanisms for fiber-optic amplifiers and switches as potential replacements of current repeaters and bistable devices.
Yu, C.↗
Quantum Versus Classical Switching Dynamics of Driven Dissipative Kerr Resonators
Here, we report a first-principles study of the driven dissipative dynamics for Kerr oscillators in the mesoscopic regime. This regime is characterized by large Kerr nonlinearity, realized here using the nonlinear kinetic inductance of a large array of Josephson junctions. The experimentally measured nonlinear resonance lineshapes of the junction array modes show significant deviations from steady-state numerical predictions, and necessitate time-dependent numerical simulations indicative of strong measurement-induced dephasing in the system arising from the large cross-Kerr effect between array modes. Analytical and numerical calculations of switching rate corroborate this by showing the emergence of a slow time scale, which is much longer than the linear decay rate and is set by fluctuation-induced switching times in the bistable regime. Furthermore, our analysis shows that the usual quantum-activated escape treatment is inadequate for prediction of the switching rates at large frequency shifts caused by strong nonlinearities, necessitating a quantum treatment that utilizes the full system Liouvillian. Based on our analysis, we identify a universal crossover parameter that delineates the regimes of validity of semiclassical and quantum descriptions, respectively. Our work shows how dynamical switching effects in strongly nonlinear systems provide a platform to study quantum-to-classical transitions.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗