Abstract:
Methods and apparatus utilize a rate of drop in pressure upstream of a gas flow controller (GFC) to accurately measure a rate of flow through the GFC. Measurement of the gas flow through the many gas flow controllers in production use today is enabled, without requiring any special or sophisticated pressure regulators or other special components. Various provisions ensure that none of the changes in pressure that occur during or after the measurement perturb the constant flow of gas through the GFC under test.
Abstract:
A fluidic system for stabilizing movement of a body subject to oscillation at its natural frequency, such as a tank-mounted gun, with appropriate circuitry and controls for notch filtering control output signals at the natural frequency.
Abstract:
PCT No. PCT/US79/00968 Sec. 371 Date Nov. 8, 1979 Sec. 102(e) Date Nov. 8, 1979, PCT Filed Nov. 8, 1979An improved load resolver (41) is provided of the type which receives a pair of generally unequal pressure signals (32, 34), and which resolves the pair of pressure signals (32, 34) by blocking the lesser and transmitting the greater. Each pressure signal (32, 34) is sent to the load resolver (41) by a respective control valve (18, 20) in a hydraulic system (10). Prior load resolver structures have required angled or intersecting holes therein or special porting therearound. The improved load resolver (41) comprises a first member (58) having a first, axially extending hole (64) and a second member (72) having second and third axially extending holes (78, 104). The members (58, 72) are fitted within a bore (48) of a control valve body (19). The improved load resolver may be utilized in a load resolver system (114) having stackable control valve bodies (17, 19, 21) without the need of special porting therebetween.
Abstract:
Discloses a pneumatic controller having a proportional band altering unit, a proportional plus integral operation unit, a comparator and a manual-automatic transfer means, wherein the proportional band altering unit is combined with the proportional plus integral operation unit to provide a proportional band altering mechanism which limits input to prevent output of the comparator from being saturated whereby to enable the pneumatic controller to perform the transfer between the manual and automatic modes in a balanceless and bumpless manner.
Abstract:
A timing device includes a timing means which effects movement of a motion transmitting member at a selected rate to provide a timed interval of selected duration, upon expiration of which interval a tripping mechanism, operated by the motion transmitting member, provides a positive biasing force for actuating and enhancing the operation of a fluid valve in controlling a fluid circuit. Means is provided for actuating the timing device in response to a relatively short-term activating pulse.
Abstract:
An instantaneous signal applied to the inlet of the timing device is passed through a restrictor into a capacitance and the resultant rising pressure is compared with an adjustable-level reference pressure signal which defines the timing period. When the capacitance pressure exceeds the reference signal value, a comparison signal initiates the release of an obturator. The reference pressure propagates to the outlet of the device and produces the time-delay signal.
Abstract:
A timing device includes a timing means which effects movement of a motion transmitting member at a selected rate to provide a timed interval of selected duration, upon expiration of which interval a snap-action mechanism, coupled to the motion transmitting member, rapidly moves a shuttle in a fluid valve from one position to another to open or close a fluid circuit.
Abstract:
A function generator is provided which establishes an output signal according to a functional relationship determined by the preformed contour of an easily precut cam member. The function generator includes a variable gain controller section coupled to a proximity sensing motion balance servomechanism which varies the gain of the controller according to the sensed proximity of the servomechanism to the edge of the cam member without physical contact therewith. The cam member's position is in turn determined by an input signal which may be related to the controller input signals or may be an independent signal from a remote source. The gain and consequently the output of the controller is varied according to the functional relationship determined by the precut contour of the cam member.
Abstract:
A modular distributor box for distributing a fluid, consisting of a linear assembly of juxtaposed prismatic modules with contiguous modules connected together by engagement of a projection having an undercut, preferably dovetail, cross-section of one module engaging with one of at least two similarly undercut intersecting grooves of a corresponding face of the next module, each module having a central conduit therethrough between the faces on which the grooves and projections are defined so that the assembled distributor box has a continuous longitudinal conduit extending therethrough. The ends of the box may be blanked off with releaseable plugs. Transverse conduits formed in the various modules of the distributor box may include pressure sensors, manometers branching pipes or blanking plugs, and at least one of the modules may include a shut off tap effective to close said central conduit.
Abstract:
An air conditioning system, especially for aircraft cabins, has a temperature control loop incorporating a signal processing control stage, in the form of a pulse logic network, to derive, from the difference or error signal received from a comparator, a control output signal suitable for driving a regulating motor to change the air flow conditions in a fresh air duct supplying the cabin. The cabin temperature is advantageously sensed by a resonant tube acoustic device delivering a pneumatic pressure oscillating output which is compared with a reference pulse frequency in fluidic logic of the comparator to derive a pulse frequency representing the difference or error. The control stage in turn derives from the error pulse frequency the regulator driving output, which is advantageously a polyphase output driving a stepping motor.