Abstract: A seal assembly for installation between rotating and stationary components of a machine includes a first plurality of leaf spring segments secured to the stationary component in a circumferential array surrounding the rotating component, the leaf spring segments each having a radial mounting portion and a substantially axial sealing portion, the plurality of leaf spring segments shingled in a circumferential direction.

Abstract: A turbine bucket tip shroud is reinforced by introducing a reinforcing material such as a ceramic-matrix composite as reinforcing rods or bars into the casting of the tip shrouded turbine bucket, to provide resistance to creep deformation. By reducing creep deformation, unlatching of the interlocked tip shrouds is minimized, and bucket overload and vibratory failures are avoided.

Abstract: A rotor tie bolt nut includes a nut body having a threaded center hole therein; a first peripheral surface on one side of the center hole that spans the center hole and extends in opposite directions to define a pair of wing sections; and a pair of buttress sections supporting the wing sections; the buttress sections having second and third peripheral surfaces connected to opposite ends, respectively, of the first peripheral surface, and to each other by a radiused surface on an opposite side of the center hole.

Abstract: An eddy current probe is configured with one axis of the electrical coil elongated to span a much larger distance than that of conventional coils. Thus, a single pass of the elongated coil can inspect a path of up to 100 times wider than the conventional coil. The parts of the eddy current probe include a pair of elongated ferrite cores disposed end-to-end in a housing block. A pair of receive coils are disposed in the housing block respectively surrounding the elongated ferrite cores. A transmit coil is wound around the receive coils in the housing block, and a pair of ferrite shields are disposed in the housing block sandwiching the transmit coil, the pair of receive coils, and the pair of elongated ferrite cores.

Abstract: Stacked wheels of the rotor of a rotary machine are axially coupled to one another by tie bolt assemblies. Each tie bolt assembly includes a stud having externally threaded opposite ends. A forward end of each stud is threaded into a non-rotatable windage nut. The aft end of each stud is secured by a primary nut having a plurality of facets, a jam nut locked against the primary nut and an anti-rotation cover between the jam nut and primary nut. The anti-rotation cover includes wings engaged against a next-adjacent wheel, preventing rotation of the cover relative to the rotor. Internal surfaces of the cover have facets greater in number than the number of facets on the primary nut whereby fine clock orientation of the cover relative to the adjacent wheel is obtained. The cover and primary nut are thus locked against rotation, thereby locking the stud/nut assembly against rotation relative to the rotor.

Abstract: Total transient stress, which is the sum of residual, mechanical and thermal stresses, is calculated. Transient stresses are estimated using compressor discharge temperature and pressure, the rotational speed of the component and the elapsed time from the beginning of a transient. By using a general stress calculation, the total stress at the end of transients at each location in the rotary part being measured can be calculated. Maximum and minimum stress peaks are recorded for the transients and stress intensity factors for each location are calculated. Crack propogation is then calculated based on the stress intensity factors and the remaining life of the machine can then be calculated using new assumed crack length and design cycle of the machine.

Abstract: A linear motor for use, for example, in sewing machines for controlling needle vibration as to amplitude and/or fabric feed both in magnitude and direction, said motor comprising a frame having an internal central pole piece spaced intermediate two permanent magnets of the high energy product type which are attached to the frame, the central pole piece providing supporting means for movable coil member integrally formed with connecting arms pivotally fastened to an actuator arm carried on a pivoted potentiometer shaft. The permanent magnets are secured through their own magnetism to the frame and are each locked in proper orientation by a non-metallic retainer which is locked to the magnet and additionally formed with a closure panel, said closure panels cooperating with the motor frame completely to enclose a compartment for the movable coil member effecting both a minimum external leakage field and a dust proof unit.