US3530870A - Fluid circuit - Google Patents

Fluid circuit Download PDF

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US3530870A
US3530870A US690460A US3530870DA US3530870A US 3530870 A US3530870 A US 3530870A US 690460 A US690460 A US 690460A US 3530870D A US3530870D A US 3530870DA US 3530870 A US3530870 A US 3530870A
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Prior art keywords
pressure
amplifier
gain
control
variable
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Expired - Lifetime
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US690460A
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Michael J Hoglund
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Honeywell Inc
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Honeywell Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/14—Stream-interaction devices; Momentum-exchange devices, e.g. operating by exchange between two orthogonal fluid jets ; Proportional amplifiers
    • F15C1/146—Stream-interaction devices; Momentum-exchange devices, e.g. operating by exchange between two orthogonal fluid jets ; Proportional amplifiers multiple arrangements thereof, forming counting circuits, sliding registers, integration circuits or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/212—System comprising plural fluidic devices or stages
    • Y10T137/2125—Plural power inputs [e.g., parallel inputs]
    • Y10T137/2142—With variable or selectable source of control-input signal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/212—System comprising plural fluidic devices or stages
    • Y10T137/2125—Plural power inputs [e.g., parallel inputs]
    • Y10T137/2147—To cascaded plural devices
    • Y10T137/2153—With feedback passage[s] between devices of cascade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/212—System comprising plural fluidic devices or stages
    • Y10T137/2125—Plural power inputs [e.g., parallel inputs]
    • Y10T137/2147—To cascaded plural devices
    • Y10T137/2158—With pulsed control-input signal

Definitions

  • the invention herein described relates generally to fluid handling apparatus, and more specifically to fluidic function generating circuits.
  • Fluid amplifiers and various other fluidic devices have been known in the art for some time. However, only recently has the fluidics art advanced to the point that complete systems utilizing fluidic components are feasible. The recent interest in fluidic systems design has increased the need for more flexible fluidic components and circuits. Many ofthe fluidic systems of interest require variable means for producing nonlinear and discontinuous mathematical functions. Thus, an increasing need exists for flexible fluidic function generating circuits.
  • Another prior art solution to this problem has been to combine an analog fluid amplifier with one or more flow restrictions of the orifice and/or laminar flow type in a circuit configuration which produces an output signal having the desired relationship to the input signal.
  • the function generating properties of a device of this type are based on the facts that the weight flow versus pressure drop characteristic of an orifice restriction resembles a square root function and that the weight flow versus pressure drop characteristic of a laminar flow restriction is substantially linear.
  • the relationship of the output signal to the input signal is based on the structural configuration of the device or circuit.
  • the function to be generated is fixed at the time the device or circuit is fabricated and can be changed only by means of structural modifications.
  • the applicant's fluidic function generator comprises input means which supplies common fluid input signals to a fluidic variable gain circuit and a control circuit.
  • the control circuit provides the variable gain circuit with gain control signals having a prescribed relationship to the input signals.
  • the gain of the variable gain circuit is controlled by the gain control signals provided thereto.
  • Output means is provided at the outlet of the variable gain circuit.
  • Means may be provided for supplying variable bias pressures to the input and output means.
  • means may be included for providing variable supply and bias pressures to the control circuit and the variable gain circuit.
  • the applicants unique function generator comprises only standard general purpose fluidic components.
  • the relationship between the input signals and the output signals of the applicant's function generator can be widely varied by changing only the supply and bias pressures provided thereto. Contrary to the prior art, no structural alterations are required to change the generated function. Further, the applicants unique circuit can generate easily variable combinations of linear and nonlinear, continuous and discontinuous functions.
  • FIG. l is a schematic representation of the applicant's fluidic function generator
  • FIG. 2 is a plurality of curves illustrating some of the input signal versus'output signal relationships of the applicants function generator.
  • Function generator 10 comprises input means 11, a fluidic variable gain circuit 12, a control circuit 13 and output means 14.
  • Input means 11 comprises a proportional amplifier 15 having a power nozzle 16, a first pair of control ports 17 and 18, a second pair of control ports 19 and 20 and a pair of outlet passages 21 and 22.
  • Power nozzle 16 is continuously supplied with fluid under pressure by means of conduit 23 from a fluid source 24 which is common to many elements in this circuit.
  • Fluid source 24 also supplies variable bias pressures to control ports 19 and 20 by means of conduits 23, 25 and 26, valves 27 and 28 and conduits 29 and 30.
  • Fluid source 24, conduits 23, 25 and 26, valves 27 and 28 and conduits 29 and 30 cooperate to form a variable bias means 31. It should be noted that this bias means configuration is shown for purposes of illustration only. Many other bias means configurations may also be utilized.
  • the bias pressure may, for example. be supplied by circuits external to function generator Ill,
  • Variable gain circuit 12 may be of any suitable type wherein gain changes are accomplished by means of a fluid gain control signal supplied thereto.
  • the particular variable gain circuit illustrated in FIG. 1 is the circuit disclosed in the copending application of Charles W. Rainer, Ser. No. 659,964, filed August 11, 1967, now U. S. Pat. No. 3,499,490 and assigned to the assignee of the present application.
  • Variable gain circuit 12 comprises a first proportional fluid amplifier 35, a second proportional fluid amplifier 36 and a third proportional fluid amplifier 37.
  • Amplifier includes a power nozzle 38, a first pair of control ports 39 and 40, a second pair of control ports 41 and 42 and a pair of outlet passages 43 and 44.
  • Power nozzle 38 is continuously supplied with fluid under pressure from fluid source 24 by means of a conduit 45.
  • Amplifiers 36 and 37 are substantially identical in geometry.
  • Amplifier 36 includes a power nozzle 50, a pair of control ports 5] and 52 and a pair of outlet passages 53 and 54.
  • Amplifier 37 includes a power nozzle 55, a pair of control ports 56 and 57 and a pair ofoutlet passages 58 and 59.
  • Outlet passages 43 and 44 of amplifier 35 are connected to power nozzles and of amplifiers 36 and 37 by means of conduits 60 and 6].
  • Outlet passages 53 and 59 of amplifiers 36 and 37 are connected to control ports 41 and 42 of amplifier 35 by means of conduits 62 and 63.
  • Control ports 51 and 57 of amplifiers 36 and 37 are supplied with a common variable bias pressure by means of fluid source 24, a conduit 65, a valve 66, and conduits 67, 68 and 69.
  • Other suitable means for supplying a bias pressure to control ports 51 and 57 will also be apparent to those skilled in the fluidics art.
  • Control ports 52 and 56 of amplifiers 36 and 37 are supplied with a common gain control signal from control circuit 13 as will hereinafter be discussed.
  • Control ports 39 and 40 of amplifier constitute the inlet to variable gain circuit 12. Control ports 39 and 40 are con nected to outlet passages 21 and 22 of amplifier 15, which constitute the outlet of input means 11, by means of conduits and 71.
  • Control circuit 13 is shown as comprising a cascade ofthree fluid amplifiers 75, 76 and 77.
  • Amplifier includes a power nozzle 80, a pair of control ports 81 and 82 and a pair of outlet passages 83 and 84.
  • Power nozzle is continuously supplied with fluid under pressure from fluid source 24 by means ofa conduit 85.
  • Amplifier 76 includes a power nozzle 90, a first pair of control ports 91 and 92, a second pair of control ports 93 and 94 and a pair of outlet passages 95 and 96.
  • Power nozzle 90 is continuously supplied with fluid under pressure from fluid source 24 by means of conduit 97.
  • Control ports 91 and 92 are connected to outlet passages 83 and 84 of amplifier 75 by means of conduits and 101.
  • Control ports 93 and 94 are supplied with variable bias pressures by means of variable bias means 102.
  • Variable bias means 102 is similar to variable bias means 31 and need not be described in further detail.
  • Amplifier 77 includes a power nozzle 110, a pair of control ports 111 and 112 and a pair of outlet passages 113 and 114.
  • Power nozzle is supplied with fluid under variable pressure from fluid source 24 by means of conduit 115, valve 116 and conduit 117. Fluid source 24, conduit 115 and valve 116 comprise a variable power supply.
  • power nozzle 110 can be supplied with fluid under variable pressure by means other than those illustrated.
  • power nozzle 110 can be supplied by means ofa fluidic circuit external to function generator 10.
  • Control ports 111 and 112 are connected to outlet passages 95 and 96 of amplifier 76 by means ofconduits 120 and 121.
  • Control ports 81 and 82 of amplifier 75 constitute the inlet to control circuit 13.
  • Control ports 81 and 82 are connected to outlet passages 21 and 22 ofamplifier 15 by means of conduits 70, 71, and 131.
  • outlet passage 114 of amplifier 77 constitutes the outlet of control circuit 13.
  • Outlet passage 114 is connected to control ports 52 and 56 of amplifiers 36 and 37 by means of conduits 132 and 133.
  • Amplifiers 75 and 76 of control circuit 13 are proportional devices.
  • Amplifier 77 may be either a proportional or a bistable device depending upon the function desired from function generator 10.
  • Other suitable control circuit configurations may contain more or fewer amplifiers. Further, in some cases it may be unnecessary to provide variable supply and bias pressures to control circuit 13.
  • the functions desired from function generator 10 determine the most suitable configuration for control circuit 13.
  • Output means 14 comprises a proportional fluid amplifier 135 having a power nozzle 136, a first pair of control ports 137 and 138, a second pair of control ports 139 and 140 and a pair of outlet passages 141 and 142.
  • Power nozzle 136 is continuously supplied with fluid under pressure from fluid source 24 by means of a conduit 143.
  • Control ports 137 and 138 are connected to outlet passages 54 and 58 of amplifiers 36 and 37, which constitute the outlet of variable gain circuit 12, by means of conduits 145 and 146.
  • Control ports 139 and 140 are supplied with variable bias pressures by means of variable bias means 147.
  • Variable bias means 147 is similar to variable bias means 31 and need not be described in further detail.
  • Control ports 17 and 18 ofamplifier 15 constitute the signal inlet to function generator 10.
  • Control ports 17 and 18 may be connected to any suitable source of pressure differential input signals (not shown) by means of conduits 150 and 151.
  • outlet passages 141 and 142 of amplifier 135 constitute the signal outlet of function generator 10.
  • Outlet passages 141 and 142 may be connected to any suitable utilization device (not shown) by means of conduits 152 and 153.
  • variable gain circuit 12 fluid from fluid source 24 issues as a stream from power nozzle 38. In the absence of a pressure differential between control ports 39 and 40, the fluid stream from power nozzle 38 will divide substantially equally between outlet passages 43 and 44. This results in fluid being supplied to power nozzles 50 and 55 of amplifiers 36 and 37 at substantially equal pressures.
  • Amplifiers 36 and 37 have substantially identical geometries. Control ports 51 and 57 are connected to the same bias pressure source and are therefore supplied with equal pressures and control ports 52 and 56 are connected to the same gain control signal source and are therefore supplied with equal pressures. Consequently, fluid will flow from outlet passages 54 and 58 at substantially equal pressures. Accordingly, in the absence of a pressure differential input signal, there will be no pressure differential output signal from circuit 12.
  • maximum pressure signal in outlet passage 54 will occur when the stream issuing from power nozzle 50 is deflected directly into outlet passage 54.
  • a maximum pressure signal in outlet passage 58 will occur when the stream issuing from power nozzle 55 is deflected directly into outlet passage 58.
  • the streams issuing from power nozzles 50 and 55 can be directed toward outlet passages 54 and 58 respectively by supplying a bias pressure to control ports 51 and 57 which is sufficiently greater than the gain control pressure supplied to control ports 52 and 56.'This bias condition results in a maximum pressure differential between outlet passages 54 and 58 and also results in a maximum circuit gain.
  • Amplifier 15 of input means 11 and amplifier 135 of output means 14 are proportional devices and are of such a size and design that they normally operate in their linear operating ranges. Therefore, assuming that a constant gain control pressure is maintained at control ports 52 and 56 of amplifiers 36 and 37, a plot of the output signal of function generator versus time willhave the same general shape as a plot of the input signal versus time. However, the magnitude of the output signals will be altered by the composite gain of input means 11, variable gain circuit 12 and output means 14. The composite gain of the input means 11, variable gain circuit 12 and output means 14 will be maximized when the gain of variable gain circuit 12 has its maximum value. Similarly, the composite gain has a zero value when the gain of variable gain circuit 12 is zero.
  • the gain of function generator 10 will be given by one of a plurality of continuous substantially linear mathematical functions. These functions can be represented by curves having slopes from zero to some maximum value corresponding to the maximum gain of function generator 10. However, the output of amplifier 77 will not, in general, remain constant. Assume, for example, that the input signal to function generator 10 is changing such that the pressure supplied to control port 17 of amplifier 15 is increasing relative to the pressure supplied to control port 18. Further, assume that the pressure at control port 17 is initially much lower than the pressure at control port 18. Thus, the pressure in outlet passage 22 of amplifier 15 is initially much less than the pressure in outlet passage 21. However, the pressure in outlet passage 22 is increasing relative to the pressure in outlet passage 21.
  • This signal is transmitted to control ports 81 and 82 of amplifier 75 in control circuit 13. Accordingly, the pressure in outlet passage 83 of amplifier 75 is initially much lower than the pressure in outlet passage 84. However, the pressure in outlet passage 83 is increasing relative to the pressure in outlet passage 84.
  • the pressure signals from amplifier 75 are transmitted to control ports 91 and 92 of amplifier 76,
  • the output signals from amplifier 76 are dependent on both the input signals supplied thereto and the setting of the valves in variable bias means 102.
  • the effect of a pressure at control port 92 which is initially much greater than the pressure at control port 91, may be counteracted by the effect of a bias pressure at control port 93 which is much greater than the bias pressure at control port 94.
  • the pressure at control port 91 is increasing relative to that at control port 92, the pressure in outlet passage 96 will increase relative to the pressure in outlet passage 95 regardless of whether or not the pressure signals from outlet passages 95 and 96 are offset due to the bias pressures supplied by variable bias means 102.
  • the purpose served by variable bias means 102 will hereinafter be further discussed.
  • the pressure signals from amplifier 76 are supplied to control ports 111 and 112 of amplifier 77. If amplifier 77 is bistable, its output will be switched from outlet passage 113 to outlet passage 114 when the pressure at control port 111 becomes greater than the pressure at control port 112 by an amount sufficient to cause amplifier 77 to switch. If amplifier 77 is proportional, its output will be gradually transferred from outlet passage 113 to outlet passage 114 as the pressure at control port 111 increases from a value less than that at control port 112 to a value greater than that at control port 112.
  • valve 116 which is a part of a variable power supply comprising fluid source 24, conduit 115 and valve 116, will hereinafter be further discussed.
  • function generator 10 will first be discussed on the basis that amplifier 77 is bistable.
  • amplifier 77 is bistable.
  • the input signal designated AP input
  • the output signal designated AP output
  • the maximum gain of function generator 10 results when the gain control pressure is zero and the bias pressure supplied to control ports 51 and 57 of amplifiers 36 and 37 is such that the fluid streams issuing from power nozzles 50 and 55 are directed toward outlet passages 54 and 58.
  • This gain can be represented by the curve EOF.
  • This gain can be represented by a line coinciding with the abscissa axis.
  • the gain of function generator 10 may assume any intermediate value, such as can be represented by curves AOK, B0] and COH by providing a gain control pressure at control ports 52 and 56 of amplifiers 36 and 37 which has the proper value relative to the bias pressure at control ports 51 and 57.
  • function generator 10 can also generate discontinuous functions.
  • a typical application for function generator 10 is in a fuel control system for a turbojet engine.
  • the mathematical function required for such an application may be the function represented by curve BOF in FIG. 2 wherein AP'input is a signal indicative ofthe speed ofthe compressor and/or turbine within a turbojet engine and AP output is a signal indicative of the rate at which fuel can be used by the engine.
  • AP input is produced by means external to function generator 10 and is transmitted to control ports 17 and 18 of amplifier 15 by means of conduits and 151.
  • AP output is transmitted from outlet passages 141 and 142 of amplifier 135 to fuel control means (not shown) by means of conduits 152 and 153.
  • the gain of function generator 10 In order to achieve the input signal versus output relationship represented by curve BOF, the gain of function generator 10 must be greater for compressor speeds above 3000 RPM than it is for compressor speeds below'3000 RPM. Thus, as the compressor speed increases from standstill to its maximum speed, the gain of function generator 10 must increase when the compressor reaches 3000 RPM. Control circuit 13 operates to automatically change the gain of function generator 10 in the required manner as will hereinafter be discussed.
  • a function which can be represented by a curve having the same slope as curve OF is generated by adjusting valve 66 such that the bias pressure supplied to control ports 51 and 57 causes function generator 10 to have the required gain when the gain control pressure is zero.
  • the gain control pressure can be made substantially zero by causing the output signal of amplifier 77 to be from outlet passage 113.
  • the maximum gain of function generator 10 and the maximum slope of the curve representing the generated function are thus controlled by the bias pressure supplied to control ports 51 and 57.
  • Portion B0 of curve BOF represents a lower gain than that represented by portion OF.
  • a function which can be represented by a curve having the same slope as BO can be generated, without changing the setting of valve 66, by giving the gain control pressure a particular positive value.
  • the gain control pressure can be given this value by causing the output signal of amplifier 77 to be from outlet passage 114 and adjusting valve 116 such that the required gain control pressure is produced.
  • the switching signal for amplifier 77 is derived from the input signal as follows.
  • the pressure in outlet passage 22 of amplifier 15 increases with respect to that in outlet passage 21.
  • the pressure signals from amplifier 15 are transmitted to control circuit 13 through control ports 81 and 82 of amplifier 75, thereby causing the pressure in outlet passage 83 to increase with respect to that in outlet passage 84.
  • the pressure signals from amplifier 75 are supplied to control ports 91 and 92 of amplifier 76, thereby causing the pressure in outlet passage 96 to increase with respect to that in outlet passage 95.
  • the output signals from amplifier 76 are, in turn, supplied to control ports 111 and 112 of amplifier 77. Accordingly, as the compressor speed increases, the pressure supplied to control port 112 will become increasingly larger than that supplied to control port 111, thereby causing the output from amplifier 77 to be switched from outlet passage 114 to outlet passage 113. Func tion generator 10 is thus switched from a gain represented by curve B0] to a gain represented by curve EOF.
  • function generator 10 is switched from one gain to another. However, it will be recognized that the magnitude of the output signal from function generator 10 may not have the same value for both gains at the time the gain is changed. If the output signal does not have identical magnitudes for both gains, a step will be created in the curve representing the generated function at the point of discontinuity. However, function generator 10 can be caused to switch at a time when its output signal has identical magnitudesfor both gains by adjusting the valves in variablebias means 102 such that appropriate bias pressures are supplied to control ports 93 and 94 of amplifier 76.
  • Amplifier 76 functions to sum the incoming signals and the bias pressures supplied thereto such that amplifier 77 is switched at a time when the output of amplifier 135 has the samevalue with either gain of variable gain circuit 12.
  • the two portions of the curve representing the generated function can be made to have a common value at the point of discontinuity as is illustrated by curve BOF.
  • bias pressures from variable bias means 31 are supplied to amplifier 15.
  • Amplifier l5 sums these bias pressures with the input signals, thus offsetting the effect of the input signals.
  • the bias pressures from variable bias means 31 have the effect'of shifting the curve representing the generated function to the left or right along the abscissa axis in FIG. 2.
  • the bias pressures from variable bias means 147, which are supplied to amplifier 135, have the effect of offsetting the output signals. Accordingly,
  • the curve representing the generated function can be shifted up or down along the ordinate axis.
  • valves 27 and 28 of variable bias means 31 are set such that the bias pressure at control port 19 is greater than the bias pressure at control port 20, the entire curve representing the generated function will be shifted to the left along the abscissa axis.
  • valves of variable bias means 3] are set such that bias pressure at control port 20 is greater than the bias pressure at control port 19, the entire curve will shift to the right along the abscissa axis.
  • valves in variable bias means 147 are set such that the bias pressure at control port 139 is greater than the bias pressure at control port 140, the entire curve will be shifted up along the ordinate axis.
  • variable bias means 147 the valves in variable bias means 147 are set such that the bias pressure at control port 140 is greater than the bias pressure at control port 139, the entire curve will be shifted down along the ordinate axis.
  • the effects of variable bias means 31 and 147 are independent. Therefore, the entire gain curve may be shifted in any direction with respect to the origin of the coordinate axis system.
  • curve BOF can be shifted to the right along the abscissa axis such that point 0 coincides with the input pressure differential corresponding to a compressor speed of 3000 RPM.
  • curve BOF can be shifted upward until the entire curve lies above the ordinate axis, thus representing an output pressure differential which is always positive.
  • the maximum and minimum gains of this embodiment can be controlled by valves 66 and 116 in the same manner describedfor the embodiment wherein amplifier 77 is bistable. Further, the entire curve representing the generated function can be shifted in any direction with respect to a fixed set of coordinate axes by appropriately adjusting bias means 13 and 147 in the manner previously described for the embodiment wherein amplifier 77 is bistable.
  • the applicants invention overcomes disadvantages of the prior art fluidic function generators by allowing changing of the generated function without the necessity of structurally altering the generator. Further, the applicant has provided an unique function generating circuit which is easily adaptable to a wide variety of applications.
  • a fluidic function generator comprising:
  • input means including an inlet and an outlet
  • variable gain circuit including an inlet, an outlet and a gain control port
  • gain control means including an inlet and an outlet
  • the fluidic function generator of claim 1 further including:
  • output means including an inlet and an outlet
  • said gain control means further includes variable power supply means and means connecting said variable power supply means to an amplifier in said gain control means.
  • the fluidic function generator of claim 5 further including:
  • output means including an inlet and an outlet
  • said variable gain circuit further includes a bias port, a first variable bias means and means connecting said first variable bias means to said bias port;
  • said gain control means comprises a cascade of fluid amplifiers including a bistable fluid amplifier, second variable bias means, means connecting said second variable bias means to an amplifier in said cascade of amplifiers, variable power supply means, and means connecting said variable power supply means to said bistable fluid amplifier.
  • the fluidic function generator of claim 7 further including:
  • output means including an inlet and an outlet
  • variable gain apparatus including an inlet, an outlet and a gain control port
  • connecting means including fluid amplifier means for connecting said input means to the inlet and the gain control port of said variable gain apparatus.
  • a cascade offluid amplifiers including a bistable fluid amplifier
  • variable power supply means
  • output means including an inlet and an outlet:

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Fluid Pressure (AREA)
  • Control Of Turbines (AREA)
US690460A 1967-12-14 1967-12-14 Fluid circuit Expired - Lifetime US3530870A (en)

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US69046067A 1967-12-14 1967-12-14

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US (1) US3530870A (enrdf_load_stackoverflow)
BE (1) BE725457A (enrdf_load_stackoverflow)
CH (1) CH492259A (enrdf_load_stackoverflow)
DE (1) DE1813943A1 (enrdf_load_stackoverflow)
FR (1) FR1598436A (enrdf_load_stackoverflow)
GB (1) GB1252748A (enrdf_load_stackoverflow)
NL (1) NL6817986A (enrdf_load_stackoverflow)
SE (1) SE341280B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665947A (en) * 1970-01-05 1972-05-30 Bendix Corp Fluidic sensing circuit and pressure regulator
US3667491A (en) * 1970-05-04 1972-06-06 United Aircraft Corp Function generator using fluid amplifiers
US3683166A (en) * 1970-01-20 1972-08-08 Bowles Eng Corp Fluidic systems have adaptive gain dependent upon input signal parameters
US3857412A (en) * 1973-07-12 1974-12-31 Us Army Notch tracking fluidic frequency filter
US3926221A (en) * 1974-08-14 1975-12-16 Us Army Laminar fluidic multiplier
WO2005080800A1 (en) * 2003-11-26 2005-09-01 Honeywell International Inc. Fluidic pulse generator system
US10065449B2 (en) 2012-11-17 2018-09-04 Fred Metsch Pereira Luminous fluid sculptures
US11199301B2 (en) 2012-11-17 2021-12-14 Fred Metsch Pereira Luminous fluid sculptures

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665947A (en) * 1970-01-05 1972-05-30 Bendix Corp Fluidic sensing circuit and pressure regulator
US3683166A (en) * 1970-01-20 1972-08-08 Bowles Eng Corp Fluidic systems have adaptive gain dependent upon input signal parameters
US3667491A (en) * 1970-05-04 1972-06-06 United Aircraft Corp Function generator using fluid amplifiers
US3857412A (en) * 1973-07-12 1974-12-31 Us Army Notch tracking fluidic frequency filter
US3926221A (en) * 1974-08-14 1975-12-16 Us Army Laminar fluidic multiplier
WO2005080800A1 (en) * 2003-11-26 2005-09-01 Honeywell International Inc. Fluidic pulse generator system
US10065449B2 (en) 2012-11-17 2018-09-04 Fred Metsch Pereira Luminous fluid sculptures
EP3561370A2 (en) 2012-11-17 2019-10-30 Fred Pereira Luminuous fluid sculptures
US11199301B2 (en) 2012-11-17 2021-12-14 Fred Metsch Pereira Luminous fluid sculptures

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Publication number Publication date
BE725457A (enrdf_load_stackoverflow) 1969-05-16
GB1252748A (enrdf_load_stackoverflow) 1971-11-10
NL6817986A (enrdf_load_stackoverflow) 1969-06-17
CH492259A (fr) 1970-06-15
FR1598436A (enrdf_load_stackoverflow) 1970-07-06
DE1813943A1 (de) 1969-07-24
SE341280B (enrdf_load_stackoverflow) 1971-12-20

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