Abstract:
A shroud assembly for a gas turbine engine consists of a housing having a boundary wall and a gas contacting skin, the wall and skin being in segmented form. The skin consists of a thin metal sheet attached to the boundary wall, and a ceramic gas contacting coating. The skin is impingement cooled by cooling air flowing through apertures in the boundary wall, and the cooling air exhausts into the gas flow through passages.The use of a thin metal sheet with a ceramic coating promotes favorable temperature gradients in the skin enabling the coating to run at optimum conditions for maximum cooling effect.
Abstract:
Instrument system including an electronic transmitter for a vibrating-wire differential-pressure sensor at a field location and connected by a two-wire line to a control room. The transmitter includes an oscillator to produce vibrations of the wire at its resonant frequency, and applies to the two-wire line a corresponding alternating voltage signal. The control room equipment converts this raw measurement data to an analog measurement signal. The control room equipment provides for adjustment of the zero and span of this signal, and for linearization with respect to the input differential pressure. The two-wire line carries a direct-current component the average value of which is automatically adjusted at the control room to match the scaled and linearized analog measurement signal. This line current passes through a meter at the transmitter to provide field service personnel with a visual indication of the value of the scaled and linearized measurement signal.
Abstract:
A method includes transforming, based on a first transform, a first markup language document associated with a first version of a schema to generate a second markup language document associated with a second version of the schema. The second markup language document is representative of a third markup language document associated with the second version of the schema and the first transform represents a transform from the first version of the schema to the second version of the schema. The method further includes comparing the second markup language document to the third markup language document to identify whether at least one discrepancy exists between the second markup language document and the third markup language document. The method additionally includes determining a suitability of the first transform based on the comparison of the second markup language document to the third markup language document.
Abstract:
A process, architecture, and computer program product for using the inheritance features of an object-oriented system to enable multiple programmers to modify different behaviors of an object concurrently. A first method and a second method to be performed on the object are identified. The first method is developed in a first application having a first subclass of the object's class. A first application-specific object is an instantiation of the first subclass. The second method is concurrently developed in a second application having a second subclass of the object's class. A second application-specific object is an instantiation of the second subclass. Invoking the first method performs the first method on the first application-specific object, such that the object communicates as if the first method were performed on the object. Modifying the first method does not affect the second method, and vice versa.
Abstract:
Reading values, setting values and setting configuration options within a complex programmable apparatus is simplified, by chaining all user interaction points into a single path, cross linking portions of the main path into subpaths and providing keys that step the user according to his selection along the main path, along the subpaths, and between the subpaths. A two part display indicating the general and specific positions clarify the locations and the options available.
Abstract:
Reading values, setting values and setting configuration options within a complex programmable controller is simplified, by chaining all user interaction points into a single path, cross linking portions of the main path into subpaths and providing keys that step the user according to his selection along the main path, along the subpaths, and between the subpaths. A two part display indicating the general and specific positions clarify the locations and the options available.
Abstract:
An architecture for integrating data between a plurality of software applications in a factory environment comprises a factory system and a domain application. The factory system comprises a domain object superclass and at least two first-level subclasses of the domain object superclass. An instantiation of one of the first-level subclasses corresponds to a domain object, which represents an item in a factory. The factory system also includes a service, which provides an operation related to the domain object. The service comprises at least one component, where each component is operable to perform the operation related to the domain object. The architecture also includes a domain application, which implements a component of the service of the factory system to perform the operation related to the domain object. The architecture can optionally include a system manager for managing hardware and software in the factory.
Abstract:
Hollow fluid cooled turbine blades of the multi-pass type used in gas turbine engines have suffered from separation of cooling fluid from longitudinally extending walls defining longitudinally extending passages as the cooling fluid is turned through a turning passage from one longitudinally extending passage to an adjacent one. The invention provides an aerodynamically shaped end portion arranged at an angle with respect to the remainder of the wall to increase the turning radius, and a turning vane is positioned in turning passage to form a convergent passage with the end portion of wall. The turning vane has a large turning radius and a large surface area for retention of a boundary layer of cooling fluid thereon. The turning vane directs the cooling fluid flowing through the convergent passage and over the turning vane substantially parallel to the wall to reduce separation in order to reduce pressure losses. The turning vane may be provided with a tail and bleed holes may be provided in the suction sidewall to reduce separation.
Abstract:
A vortex-shedding flow-sensing instrument comprising a flat-faced vortex-generating plate integral with a downstream sensor-bar having flat sides set back laterally with respect to the rows of vortices shed from the edges of the vortex-generating plate. The side surfaces of the plate are tapered inwardly at a moderate angle, and extend downstream a short distance to rear surfaces at right angles with respect to the direction of fluid flow. The downstream end of the sensor bar comprises a tail piece the side surfaces of which are tapered inwardly at a moderate angle, and extend downstream a short distance to a rear surface perpendicular to the direction of fluid flow.The sensor bar carries a liquid-filled capsule having as side walls a pair of flexible diaphragms effectively in the plane of the sensor-bar side surfaces. These diaphragms are of moderately large area so as to respond to a relatively large portion of the vortex energy. The diaphragms transmit alternating vortex pressure pulses interiorly of the capsule to a sensing element in the form of a ceramic disc having piezo-electric properties. The resulting alternating voltage signal developed by this element is coupled through lead wires to an amplifier arranged to produce a flow signal suitable for transmission over relatively long distances.