Abstract: A system and method for improving transient speed response of electric motors includes a comparator that determines a difference between a current reference and an adjusted current reference generated by the electric motor drive system, and an integrator the receives and integrates the difference between the current reference and the adjusted current reference over time to yield total accumulated lost current-seconds, and outputs at least a portion of the integrated difference between the current reference and the adjusted current reference as current-seconds to be added to the current reference. The present invention keeps track of the total accumulated loss-seconds due to current rate limitations, and restores the total accumulated lost current-seconds to the system when current becomes available.

Abstract: A surface of a nickel-base article such as an internal surface of a gas turbine airfoil is protected with a donor layer of aluminum and at least one other element. To form the protective layer, a donor alloy is contacted to the protected surface of the article, and simultaneously the article and the donor alloy are heated to a coating temperature that is greater than about 0.7 of the absolute solidus temperature of the donor alloy but is such that the donor alloy remains in the form of a condensed phase contacting the protected surface of the article. The donor alloy is thereafter interdiffused into the protected surface of the article.

Abstract: A gas turbine component, such as a turbine disk or a rotating seal, is fabricated by furnishing a substrate shaped as a gas turbine component made of a nickel-base superalloy, and oxidizing the substrate to produce an oxidized substrate having thereon a layer comprising an oxide and having a thickness of at least about 500 Angstroms. The step of oxidizing is performed prior to entry of the component into service and in an atmosphere that does not contain combustion gas. The oxidized gas turbine component is thereafter placed into service.

Abstract: A pipe flange cover for temporarily covering a pipe opening and a pipe flange at an end of a pipe, the cover having a front face and a rear face, the rear face having a center portion surrounded by a peripheral portion of the rear face, the peripheral portion formed with a plurality of axially projecting spring lugs; the center portion adapted to engage a front side of the pipe flange and to seal the pipe opening, the spring lugs adapted for insertion into bolt holes on the pipe flange. The center portion is axially offset from the peripheral portion, and connected thereto by an integral bellows.

Abstract: A one-piece deflector-flare cone assembly for a gas turbine engine combustor that facilitates extending a useful life of the combustor in a cost-effective and reliable manner is described. The one-piece assembly includes a deflector portion and a flare cone portion. The deflector portion includes an integral opening that extends through the deflector portion for receiving cooling fluid therein. The cooling opening extends circumferentially within the deflector portion. Cooling fluid discharged from the cooling opening is used for impingement cooling a portion of the flare cone portion to facilitate reducing an operating temperature and extending a useful life of the combustor.

Abstract: A model-based trending process for a gas turbine engine that generates, in real-time, engine trend parameters from engine sensor data and ambient flight condition data to assess engine condition is described. The engine includes a plurality of sensors that are responsive to engine operations. The trending process is implemented using a commercially available processor coupled to the engine to monitor the engine operations, and having the desired processing speed and capacity. Engine health parameters are estimated and adjusted in a model for component diagnostics and fault detection and isolation. The trend parameters generated are retained.

Abstract: An article, made of a material such as a iron-nickel-base alloy, is weld repaired, and then heat treated. The heat treatment includes heating the weld-repaired portion to a first hold temperature of at least about 1775 degrees Fahrenheit, cooling the weld-repaired portion to a temperature of 1025 degrees Fahrenheit or less, heating the weld-repaired portion at a rate of at least about 10 degrees Fahrenheit per minute or greater, to a second hold temperature of at least about 1525 degrees Fahrenheit, cooling the weld-repaired portion to a third hold temperature of about 1425 degrees Fahrenheit or less, and cooling the weld-repaired portion to a fourth hold temperature of about 1225 degrees Fahrenheit or less.

Abstract: An apparatus and method are provided for continuously monitoring the operation of electrical equipment and preventing critical operational failures. The invention quantitatively determines the concentrations of gas and/or vapor (including water) components in an insulating fluid on a real time basis. An increase of one or more detected chemical components signifies an actual or potential electrical problem with the equipment. The preferred apparatus consists of a gas extractor, an infrared gas analysis instrument, and a gas diaphragm pump. Gas and water vapor components are extracted from the insulating fluid by permeating through a membrane in a gas extractor. The gas and/or vapor components are then brought into an infrared gas analyzer by the gas diaphragm pump. A quad detector in the analysis instrument identifies and determines the concentration of three specified gases and/or the vapor simultaneously.

Abstract: The invention provides a load measurement in a crane hoist system. A parameter adaptation process uses a model of the system in order to measure the lifted load. A controller monitors hoist speed and hoist torque feedbacks that are input into the model and processed using a filter, as well as a previously determined load value. The model adapts automatically to determine the weight of the lifted load.

Abstract: A substrate is protected by first providing the substrate, and applying a ceramic coating overlying and bonded to the substrate. The ceramic coating is formed of an open-cell solid foam of ceramic cell walls having an interconnected intracellular volume therebetween which is filled at least in part with a metallic alloy. The ceramic coating has an exposed surface remote from the substrate. The exposed surface of the ceramic coating is heated to an exposure temperature such that at least some of the metallic alloy is lost from the intracellular volume.

Abstract: A superalloy has a composition of, in weight percent, from about 16.0 percent to about 22.4 percent cobalt, from about 6.6 percent to about 14.3 percent chromium, from about 1.4 percent to about 3.5 percent tantalum, from about 1.9 percent to about 4.0 percent tungsten, from about 1.9 percent to about 3.9 percent molybdenum, from about 0.03 percent to about 0.10 percent zirconium, from about 0.9 percent to about 3.0 percent niobium, from about 2.4 percent to about 4.6 percent titanium, from about 2.6 percent to about 4.8 percent aluminum, from 0 to about 2.5 percent rhenium, from about 0.02 percent to about 0.10 percent carbon, from about 0.02 percent to about 0.10 percent boron, balance nickel and minor amounts of impurities. The superalloy is advantageously utilized in aircraft gas turbine disks.

Abstract: A metallic substrate has a substrate surface having a substrate surface of nickel, a substrate aluminum content, and other alloying elements. A maskant is applied overlying the substrate surface to produce a masked substrate surface having an exposed region and a protected region. The maskant includes a plurality of maskant particles, each particle having a maskant particle composition comprising a maskant metal selected from the group of nickel, cobalt, titanium, chromium, iron, and combinations thereof, and a maskant aluminum content. The substrate is aluminided by contacting a source of aluminum to the masked substrate surface, whereby aluminum deposits on the exposed region and does not deposit on the protected region.

Abstract: An article having a substrate is protected by a thermal barrier coating system. An interfacial layer contacts the upper surface of the substrate. The interfacial layer may comprise a bond coat only, or a bond coat and an overlay coat. The interfacial layer has on its upper surface a preselected, controllable pattern of three-dimensional features, such as grooves in a parallel array or in two angularly offset arrays. The features are formed by an ablation process using an ultraviolet laser such as an excimer laser. A ceramic thermal barrier coating is deposited over the pattern of features on the upper surface of the interfacial layer.

Abstract: A process to produce organic phosphites from the group consisting of: 1

Abstract: An improved method of burning low sulfur coal in order to power gas turbines using unmixed combustion that ensures virtually complete oxidation of the coal, with the sulfur content of the coal being recovered as elemental sulfur for use as recycle in the unmixed combustion process. An unmixed combustion catalyst is circulated between two fluid bed reactors and becomes reduced by low sulfur coal in the first fluid bed reactor and oxidized by air in the second fluid bed reactor. The first reactor produces carbon-containing fly ash which is then separated and contacted with gases containing SO2 from the first fluid bed reactor to produce CO2, CO, H2S, COS, CS2, and elemental sulfur. The elemental sulfur is separated and a portion thereof recycled back to the first fluid bed reactor.

Abstract: A system for accessing aircraft engine component repair information by internal users and external customers is described. The system includes a server, at least one computer and a network connecting the computers to the server. The server is configured with a database of repair order and quote information and a plurality of user interfaces associated with the repair information. The user interfaces allows a user to input information into the database, which is downloaded to the customer in response to an inquiry.

Abstract: A variable gas turbine compressor vane structure includes a gas turbine compressor vane having a vane support at an end thereof, and a case structure having a bearing support disposed to engage the vane support of the gas turbine compressor vane. The bearing support is typically a bearing bushing or a bearing washer. The bearing support is made of a metal skeleton having open-cell porosity extending therethrough, and an infiltrant material such as an organic or a ceramic infiltrated into the porosity of the metal skeleton.

Abstract: A method and relay for magnetizing inrush restraint in protective relays for power transformers. The method utilizes the phase angle relation between the fundamental component and the second harmonic in addition to the magnitude ratio. This is accomplished by calculating and utilizing the complex second harmonic ratio. The specially shaped operating characteristic for the complex second harmonic ratio is made dynamic providing for better security without jeopardizing dependability of the transformer protective relay.

Abstract: A method of making a coated substrate which includes the steps of applying a layer of a coating composition, said coating composition comprising an alkenyl functional organopolysiloxane and a hydride functional organopolysiloxane, to the substrate, said substrate comprising a catalytically effective amount of a precious metal catalyst, and allowing the layer to cure, allows the use of a non-catalyzed coating bath having a very long useful life, while providing a highly reactive coating layer that may be rapidly cured at low temperature.

Abstract: A method of making a coated substrate which includes the steps of applying a layer of a coating composition, said coating composition comprising an alkenyl functional organopolysiloxane and a hydride functional organopolysiloxane, to the substrate, said substrate comprising a catalytically effective amount of a precious metal catalyst, and allowing the layer to cure, allows the use of a non-catalyzed coating bath having a very long useful life, while providing a highly reactive coating layer that may be rapidly cured at low temperature.