Michael G. Mccaffrey

Bio: Michael G. Mccaffrey is an academic researcher from United Technologies. The author has contributed to research in topics: Seal (mechanical) & Rotor (electric). The author has an hindex of 16, co-authored 75 publications receiving 684 citations.

Blade clearance control using high-CTE and low-CTE ring members

Abstract: An engine has a blade stage (10) and a circumferential array of blade outer air seal segments (66). A support ring (70) carries the blade outer air seal segments (66). The support ring (70) has a low-CTE member (72) and a high-CTE member (90) intervening between the blade outer air seal segments (66) and the low-CTE member (72).

Gas turbine engines and related systems involving variable vanes

Abstract: Gas turbine engines and related systems involving variable vanes are provided. In this regard, a representative vane assembly for a gas turbine engine includes: a first inner diameter platform; a first outer diameter platform spaced from the first inner diameter platform; and a variable vane airfoil rotatably attached to and extending between the first inner diameter platform and the first outer diameter platform such that at least a portion of the vane airfoil extends beyond a periphery of at least one of the first inner diameter platform and the first outer diameter platform.

Variable area turbine vane arrangement

Abstract: A ring vane nozzle for a gas turbine engine according to an exemplary aspect of the present disclosure includes a multiple of fixed turbine vanes between an inner vane ring and an outer vane ring and a multiple of rotational turbine vanes between the inner vane ring and the outer vane ring, each of the rotational turbine vanes rotatable about an axis of rotation.

LED replacement bulb

Abstract: A replacement light bulb assembly (10) for use in an incandescent light fixture utilizes a light emitting diode (LED) (14). An LED (14) is bonded to a base (12) that fits within a typical incandescent light bulb fixture. The LED (14) is electrically connected to the base (12) and a center post (20) within the base (12) to form an electrical circuit when assembled within an incandescent light fixture. A control (36) is connected to the LED (14) to modify the LED output. The control (36) can also be used to modify the voltage or current requirements of the light bulb assembly (10) for use with DC current or AC current applications. An external shield (52) or lens, or an internal shield (56) or lens, may be added to the light bulb assembly (10) or directly to the LED (14) to alter the light emitted. Several variations of the light bulb assembly (10) having each having base corresponding to a typical incandescent light bulb fixture may be available.

Turbine engine sealing arrangement

Abstract: A turbine engine sealing arrangement includes a blade array rotatable about an axis (X). The blade array has a plurality of blades (50) extending radially from the axis. A control ring (62) is circumferentially disposed about the blade array. A plurality of tiles (70,74,78) are secured relative to the control ring (62) and configured to establish an axially extending seal with one of the blades (50).

Led-based light bulb device

Abstract: An LED light bulb device including a bulb body, a cap and an LED assembly. The bulb body defines an exterior surface and an interior. The cap is mounted to the bulb body, combining to define a light bulb-like structure. The LED assembly includes a substrate, LEDs, transformer circuitry and connective circuitry. The LEDs and the connective circuitry are maintained by the substrate, with the connective circuitry electrically connecting the LEDs and the transformer circuitry. The transformer circuitry is adapted to modify incoming power for powering the LEDs. The LED assembly is mounted to the light bulb-like structure such that the LEDs are disposed along the exterior surface of the bulb body, with light from the LEDs being directed inwardly into the interior and then outwardly from the interior. The LED assembly can further include a heat sink body encompassing the LEDs.

Illumination apparatus and methods of forming the same

Abstract: In one aspect, an illumination apparatus includes a waveguide, embedded in which are a light-emitting source and a photoluminescent material. Output light is emitted from at least a portion of a first surface of the waveguide. The photoluminescent material includes nano-size phosphor particles and/or quantum dots.

Mounting apparatus for low-ductility turbine shroud

Abstract: A turbine shroud apparatus is provided for a gas turbine engine having a central axis. The apparatus includes: (a) an annular support member (14); (b) a turbine shroud (12) disposed in the support member (14), the shroud (12) being a continuous ring comprising a low-ductility material and having opposed flowpath and back surfaces, and opposed forward and aft ends; and (c) a spring (32) mounted between the support member (14) and the shroud (12) and arranged to resiliently urge the shroud (12) to a concentric position within the support member (14).

LED-based light bulb device with Kelvin corrective features

Abstract: An LED light bulb device including a bulb body, a cap, an LED assembly, and first and second light affecting features. The cap is mounted to the bulb body for connection to an electrical socket. The LED assembly includes a plurality of LEDs and framework. The framework maintains the LEDs relative to the bulb body such that emitted light is directed at an LED region of the wall. The first light affecting feature is associated with the LED region of the wall, whereas the second light affecting feature is associated with a diffusion region of the wall, with the diffusion region being apart from the LED region. The first light affecting feature affects light in a manner different from that of the second light affecting feature. The light affecting features are selected to affect or alter light emitted from the LEDs to provide a desired Kelvin color temperature and diffusion.

Turbine ring assembly

Abstract: A turbine ring assembly includes a ring support structure and a plurality of ring sectors, each including a single piece of ceramic matrix composite material. Each ring sector includes a first portion forming an annular base with an inside face defining an inside face of the turbine ring and an outside face from which there extends two tab-forming portions including ends that are engaged in housings in the ring support structure. The ring sectors present a section that is substantially π-shaped and the ends of the tabs are held without radial clearance by the ring support structure. The tabs can have a free length in meridian section that is not less than three times their mean width.