Showing papers on "Fluidics published in 1972"
Book•
01 Jan 1972
TL;DR: The T Synoptic as mentioned in this paper is a review of fluidics technology, focusing on nonaerospace engineering managers who are unfamiliar with fluidic systems and their potential applicability, and drawn heavily upon R&D work performed or sponsored by NASA.
Abstract: T Synoptic (taken from Ref. 1) is a state-of-the-art review of fluidics technology. It emphasizes systems applications rather than theory or design. It is directed towards the nonaerospace engineering manager who is unfamiliar with fluidic systems and their potential applicability. The Synoptic draws heavily upon R & D work performed or sponsored by NASA, and therefore serves as a compilation of NASA's fluidics efforts.
51 citations
Patent•
08 Dec 1972
TL;DR: In this paper, an approach for supplying pulses of fluid pressure to a chamber has been proposed, which has means for supplying pressurized fluid to the chamber and means responsive to the pressure of the fluid in the chamber for controlling the supply means to provide pulses of pressure fluid.
Abstract: Apparatus for supplying pulses of fluid pressure to a chamber has means for supplying pressurized fluid to the chamber and means responsive to the pressure of the fluid in the chamber for controlling the supply means to provide pulses of pressure fluid. Additional means for sequentially selecting one of a plurality of such chambers to be supplied with pressure are provided in a preferred embodiment and the control, selecting and sequencing means are fluidic elements.
38 citations
01 Jan 1972
TL;DR: A state-of-the-art review of fluidic technology is presented in this paper, which is oriented towards systems applications rather than theory or design, focusing heavily upon work performed or sponsored by NASA in support of the space program and aeronautical research and development (R&D).
Abstract: A state-of-the art review of fluidic technology is presented. It is oriented towards systems applications rather than theory or design. It draws heavily upon work performed or sponsored by NASA in support of the space program and aeronautical research and development (R&D). Applications are emphasized in this survey because it is hoped that the examples described and the criteria presented for evaluating the suitability of fluidics to new applications will be of value to potential users of fluidic systems. This survey of the fluidics industry suggests some of the means whereby a company may use a fluidic system effectively either to manufacture a product or as part of the end product.
11 citations
Patent•
16 Feb 1972
TL;DR: A direct proportion converter as mentioned in this paper is a direct proportional converter in which fluid pressure is directly proportioned in magnitude or quantity to an electric current, and broadly an electric to fluid proportioning device for gases or low viscosity liquids.
Abstract: A direct proportion converter in which fluid pressure is directly proportioned in magnitude or quantity to an electric current, and broadly an electric to fluid proportioning device for gases or low viscosity liquids. A fluid pressure regulating valve is actuated by changes in equilibrium between an electrically generated force on one side of a diaphragm and the fluid output pressure on the opposite side of the diaphragm.
11 citations
Patent•
05 Apr 1972
TL;DR: In this article, the density of a fluid is measured employing apparatus including a cylinder immersed in the fluid, together with driving and pickup means operating to resonate the cylinder at its natural frequency as affected by the fluidic medium.
Abstract: The density of a fluid is measured employing apparatus including a cylinder immersed in the fluid, together with driving and pickup means operating to resonate the cylinder at its natural frequency as affected by the fluidic medium; the apparatus described has the drive and pick-up coils located external to the resonating cylinder so that they are free of the fluidic medium.
9 citations
Patent•
17 Feb 1972
TL;DR: In this paper, a linear piston type, fluid damped, adaptive shock absorber for an aircraft landing gear strut having an automatically adjustable orifice through the piston is controlled by a fluidic vortex valve which utilizes small control jets of high pressure fluid injected tangentially into a circular chamber.
Abstract: A linear piston type, fluid damped, adaptive shock absorber for an aircraft landing gear strut having an automatically adjustable orifice through the piston. The impedance to the flow of damping fluid through the orifice is controlled by a fluidic vortex valve which utilizes small control jets of high pressure fluid injected tangentially into a circular chamber through which the main flow of hydraulic damping fluid passes. The force of fluid injected through the tangential control jets determines the strength of the swirling action of the main damping fluid flow and thereby controls the impedance to the main fluid flow through the vortex valve and the fluid chamber. The fluid pressure to the tangential control jets is automatically controlled by a servo valve which is, in turn, controlled by an automatic sensing system that determines the aircraft''s vertical acceleration.
8 citations
Patent•
27 Mar 1972
TL;DR: In this article, a fluidic generator utilizing a novel fluid intake system for achieving increased power output at low pressures is presented, where the resonating cavity of the generator is provided at its fluid intake end with a mechanical member for separating and converging fluid.
Abstract: A fluidic generator utilizing a novel fluid intake system for achieving increased power output at low pressures. The resonating cavity of the fluidic generator is provided at its fluid intake end with a mechanical member for separating and converging fluid. The cavity is adjacent an intake orifice with the member being located inside the orifice for separating fluid flowing out of the orifice. The fluid is converged at the entrance to the cavity and ultimately fills and empties the cavity to vibrate a diaphragm at resonance for generating electrical or mechanical output signals.
6 citations
TL;DR: In this article, pure fluid digital flowmeters are described and factors determining their accuracy are discussed, and a new type of vortex flow controller is also described and shown to have advantages in performance and geometry over existing devices.
Abstract: Some pure fluid digital flowmeters are described and factors determining their accuracy are discussed. One meter under development is described in detail and performance characteristics are given. A new type of vortex flow controller is also described and shown to have advantages in performance and geometry over existing devices. Further improvements in performance and new devices which ease the control and interface problem are discussed. Flow diverters are also described and some characteristics are presented.
4 citations
Patent•
21 Jun 1972
TL;DR: A fluidics proximity sensing device comprises a transmitter for directing a pressure fluid jet to impinge upon an object to be sensed, and a receiver including a receiver orifice leading to a receiver passage in which fluid moves in response to the pressure at said orifice.
Abstract: A fluidics proximity sensing device comprises a transmitter for directing a pressure fluid jet to impinge upon an object to be sensed, and a receiver including a receiver orifice leading to a receiver passage in which fluid moves in response to the pressure at said orifice, a sensing fluid passage intersecting said receiver passage so that a sensing fluid flowing in the sensing fluid passage traverses the receiver passage and is thus disturbed by fluid movement in the latter. By appropriate choice of passage dimensions and fluid pressures the device may be adapted to provide long-range sensing of objects, an output signal that is an analogue of the distance of a sensed object from the device, or an output signal that changes substantially in response to small changes in the proximity of a sensed object.
4 citations
Patent•
20 Apr 1972TL;DR: In this article, a reversible hydraulic machine operating as a pump or a motor in both directions of rotation can be adjusted to different displacement volumes by fluidic actuating means controlled by an output control signal of an additive control amplifier.
Abstract: A regulating apparatus for a reversible hydraulic machine operating as pump or hydraulic motor in both directions of rotation. The machine can be adjusted to different displacement volumes by fluidic actuating means controlled by an output control signal of an additive control amplifier which compares a first control signal representing the actual displaced volume with a second control signal representing the desired displaced volume. The second control signal is generated in a fluidic control device which includes a fluidic limiting device limiting the second control signal, and being controlled by a first fluidic circuit responsive to the product of the actual and desired volume and fluid pressure of the machine, and by a second fluidic circuit responsive to the highest actual fluid pressure of the machine.
3 citations
Patent•
10 Jan 1972
TL;DR: A fluidically controlled fluid system in which a fluid source is operated in a first line when static pressure is established in a second line is defined in this article, where the fluid source can be operated in the first line and the static pressure in the second line.
Abstract: A fluidically controlled fluid system in which a fluid source is operated in a first line when static pressure is established in a second line.
Patent•
30 Mar 1972TL;DR: In this paper, a fluidic pulse generator is described which is capable of responding to a plurality of inputs having both digital and analog characteristics and of providing an output signal having a pulse duration which is a function of the various input parameters.
Abstract: A fluidic pulse generator is disclosed which is capable of responding to a plurality of inputs having both digital and analog characteristics and of providing an output signal having a pulse duration which is a function of the various input parameters. Such a device is of utility when used as the main fuel injection pulse computing device in a fluidic fuel injection system. The circuitry is comprised of a plurality of fluidic gating devices and the variable time determinative means which includes a chargeable volume and a variable restriction illustrated in the form of a vortex fluidic device.
TL;DR: In this article, a jet-siphon liquid flow frequency transducer is considered where continuous flow is converted into discrete flow pulses by a siphon and the pulses are counted by a pneumatic device.
Patent•
20 Jun 1972TL;DR: In this article, a fluidic system for evaluating the physical characteristics of an article within upper and lower limits is described, which includes a fixture in which the article to be measured is placed, a source of fluid pressure which delivers fluid to the fixture, a plurality of fluidic amplifiers, a pair of interface signal devices and a pairof indicators.
Abstract: A fluidic system for evaluating the physical characteristics of an article within upper and lower limits. The system includes a fixture in which the article to be measured is placed, a source of fluid pressure which delivers fluid to the fixture, a plurality of fluidic amplifiers, a pair of interface signal devices and a pair of indicators. Pressure signals resulting from fluid flow past the article in the fixture are conducted to the signal devices which emit control signals to actuate the fluidic amplifiers. The output of two of the fluidic amplifiers are in fluid communication with the indicators and function to selectively actuate the indicators in response to the fluid pressure in the fixture and the signals emitted by the signal device.
Patent•
31 Mar 1972
TL;DR: In this paper, a fluidic circuit device incorporating one or more multiple input fluidic jet elements arranged so that the jet axes of each of the jets is directed to a mixing region at an obtuse angle with respect to a baffle, and the ends of the nozzles of the multiple jet elements define a line or plane that is at an acute angle to the baffle.
Abstract: A fluidic circuit device incorporates one or more multiple input fluidic jet elements arranged so that the jet axes of each of the jets is directed to a mixing region at an obtuse angle with respect to a baffle, and the ends of the nozzles of the multiple jet element define a line or plane that is at an acute angle with respect to the baffle. The nozzle system is disclosed in combination with a wall attachment device, as an arrangement to permit the series or parallel combining of signals, and in an arrangement having opposed elements.
TL;DR: In this article, a straight pipe of circular cross-section caused by the existence of a spherical object was investigated and the pressure drop can be predicted based on the Reynolds number for fully developed turbulent flow conditions and the diameter ratio of the spherical object and the pipe.