Abstract: A starting system for starting the propulsion engines of gas turbine powered aircraft that combines power sources delivered by the APU so that essentially then entire power delivered by the APU for pneumatic, hydraulic and electric power is applied to corresponding starters on each propulsion engine during MES simultaneously.

Abstract: An active filtration or harmonic scrubber system for power systems that convert AC power on an AC bus to DC power that cancels or reduces harmonic current injected by nonlinear loads onto the AC bus using high-bandwidth pulse width modulation (PWM) inverters.

Abstract: An auxiliary power unit for aircraft with a load compressor that delivers cabin air free of oil contamination by supporting a drive shaft for the load compressor with oil-free bearings and coupling the load compressor to a gearbox and power head for the auxiliary power unit through a synchronous magnetic torque coupling on an opposite side of the gearbox to which the power is mounted.

Abstract: A sight glass block for inspecting oil flow through a scavenge line for an oil separation system in a compressor comprises a combination of a sight glass for inspecting the oil flow, a strainer for cleaning the oil flow and an orifice for metering the oil flow in a single integrated component.

Abstract: An improved ram air turbine for generating emergency aeronautical supplemental power with a plurality of concentric or nested linear bearings for supporting a speed governor yoke plate on a speed governor shaft comprising a movable sleeve that supports the yoke plate and rides on the governor shaft.

Abstract: A high-power, liquid-cooled, multi-layer winding inductive device that has a region of interspersed winding layers and directed coolant flow over the interspersed windings to improve heat transfer and device life.

Abstract: A shaft sensorless rotor angular position and velocity sensing system for a ynamoelectric machine that includes: a reference frame transformation function for transforming measured currents and potentials applied to a stator of the dynamoelectric machine to a two-phase ?-? stationary frame to produce transformed currents I?,I? and transformed potentials V?,V?; first and second multipliers to produce signals I?*RS,I?*RS; first and second summers to produce signals V?,?I?*RS,V??I?*RS; first and second lag functions to produce signals 1 s + ? i ? ( V ? - I ? * R s ) , 1 s + ? i ? ( V ? - I ? * R s ) ; third and fourth multipliers to produce signals I?*Lq,I?*Lq; third and fourth summers to produce signals 1 s + ? i ? ( V ? - I ? * R s ) - I ? * L q , 1 s + ? i ? ( V ? - I ? * R s ) - I ? * L q that correspond to extended rotor flux values ?ext—?,?ext—?; and a phase lock loop (PLL) to derive estimated

Abstract: A carrier injection sensorless (CIS) starting control system that is capable of determining the angular position and velocity of a rotor for a wound field synchronous machine at or near rest and comprises north-south pole determination and a variable or dual frequency carrier signal for improved performance throughout the start sequence for the machine.

Abstract: A system for enhancing the performance of a carrier insertion sensorless (CIS) position sensing system for a wound field synchronous machine that utilises the positively rotating components (+2?ct) of the carrier second harmonic currents that contain rotor position information before field excitation to serve as a north-south pole indicator that determines if the CIS system has locked onto the north or south pole of the rotor.

Abstract: A method of measuring the presence of oil in turbine bleed air that uses an aerosol sampler/size classifier to do a comparative measurement of the engine bleed air to the ambient air entering the engine on a real time basis by comparing quantity and size distribution of suspended particles of engine inlet air with suspended particles in the bleed air throughout the normal operating schedule of the engine and determining the presence of oil in the bleed air when the quantity and size distribution of suspended particles in the bleed air exceeds the quantity and size distribution of suspended particles in the engine inlet air by a predetermined amount.

Abstract: An annular combustor that has angled effusion holes through at least one surface of the combustor liner with the angle of the effusion holes oriented to cause the flow of air through the holes to facilitate swirling of the fuel and air within the combustor. The effusion holes thereby facilitate efficient cooling of the combustor liner combined with superior fuel/air mixing within the combustor.

Abstract: A flexible coupling having a generally cylindrical flexible element with a plurality of generally radial element teeth that are engaged by a plurality of generally radial hub teeth that penetrate generally radial element tooth faces on the element teeth, with the hub teeth arranged around generally radial hub faces of generally cylindrical shaft hubs and means for reducing axial loading of drive shafts attached to the hubs under load.

Abstract: A magnesium methylate coating useful for insulating electromechanical hardware that comprises a composition of magnesium methylate, methyl alcohol, silica and talc.

Abstract: An engine starting system (100) includes a starter (106) coupled to an engine (102) through a rotational energy storage device (108) such as spiral spring (108). When electrical power is applied to the starter (106), the rotational energy produced by the starter (106) is stored in the rotational energy storage device (108) allowing the starter (106) to rotate which reduces electrical currents in the starter and stress on system components. The rotational energy is gradually transferred to the engine (102) until the engine (102) is rotationally self-sustaining.

Abstract: An endless loop transmission chain balances the differences in moments and stresses on its inner and outer links. The chain is comprised of a plurality of links that are pivotally connected in stacks and in overlapping series. The links are fashioned with holes perpendicular to the link faces, and the links are either “robust” or “thin”. Robust links may be made of material of greater tensile strength, they may be formed by mating at least two thin links, and/or they may be made of thicker material. A plurality of pins serially connects and stacks the links. The pins fit though the holes in each link perpendicular to the link face. Robust and thin links are alternated in stacks in a pattern that balances link tension when the chain is under tension. Fewer links carry the tension between any set of adjacent pins. When it is used in a transmission, this chain has at least 10% higher torque-carrying capacity than the prior art.

Abstract: A continuously variable transmission and method for preventing transmission belt slippage in the case of a sudden change in load torque on the transmission involve one or both of inserting a lag in the transmission with a torsional spring damper or elastomer damper device between the device to be driven and an output shaft of the secondary pulley of the transmission, and inserting a lag in a hydraulic pressure control loop of the transmission compensating for a difference between the rate of torque transmission between the device to be driven and the transmission, and a response rate of the hydraulic pressure control loop to a sudden change in load torque. The transmission is used to drive an aircraft electrical generator at a constant speed in the disclosed embodiment.

Abstract: A method and apparatus for remotely generating pressure signals in a fluid stream for telemetry purposes with minimal insertion loss and susceptibility to blocking flow of the fluid stream by providing a straight through acceleration path for the fluid stream followed by a straight through diffusion path, wherein pressure pulses representing data are generated by turbulence resulting from periodic disturbances made in the diffusion path.

Abstract: The invention is based on the discovery that under certain conditions lasing at room temperature can be achieved in a Pr.sup.3+ -doped fluorozirconate fiber pumped in the infrared at 1.01 .mu.m and 835 nm, the lasing taking place in the blue (491 nm), green (520 nm), orange (605 nm) and red (635 nm and 715 nm). One laser comprises a length of Pr.sup.3+ -doped potical waveguide such as a fiber, and means for exciting the Pr.sup.3+ ions to an energy level in the band (.sup.3 P.sub.2, .sup.1 I.sub.6, .sup.3 P.sub.1, .sup.3 P.sub.0), in which the Pr.sup.3+ concentration is in the range substantially 50 ppm to substantially 10,000 ppm (by weight). The Pr.sup.3+ concentration is preferably in the range substantially 200 ppm to substantially 2,000 ppm (by weight). The optical fiber is preferably a fluorozirconate fiber doped at the foregoing concentrations with Pr.sup.3+ ions. The fiber preferably comprises a doped core clad with a further glass. The excitation means is preferably arranged to excite the Pr.sup.

Abstract: An upconversion laser system that uses solid state components throughout and achieves such operation with a substantially coherent, continuous or quasi-continuous single band infrared pumping source using successive energy transfers between the sensitizer and activator in the host of the lasant upconversion material.

Abstract: A laser radiation source apparatus comprises a laser source means for producing laser radiation; a stepped-index optical fiber; first coupling means for coupling the laser source means with one end of the stepped-index optical fiber; and second coupling means for coupling the other end of the stepped-index optical fiber with another fiber suitable for transmission of laser radiation. The stepped-index fiber optic includes a core suitable for transmission of laser radiation, which is encompassed by at least one cladding layer and a buffer layer, in which the refractive index value for the core is greater than the refractive index value for the cladding layer, and the refractive index value for the cladding layer is greater than the refractive index for the buffer layer, so that laser radiation transmitted into the cladding layer is transmitted through the fiber. Single index fibers having several diameters may be coupled to the apparatus.