Abstract: A system comprises a vibration sensor for generating a vibration signal on a turbomachine, a signal conditioner for conditioning the vibration signal, and a test signal generator for calibrating the signal conditioner. The test signal generator calibrates the signal conditioner with a test signal having a base frequency and a modulation frequency. The signal conditioner introduces a phase error into the vibration signal, and the signal conditioner introduces a phase shift into the test signal. A processor compensates for the phase error in the vibration signal by correcting the vibration signal based on the phase shift in the test signal, where the processor determines the phase shift in the test signal based on harmonic analysis of the modulation frequency.

Abstract: An error detection and correction (EDAC) circuit mitigates the effect of single event upsets (SEU) events in a redundant memory system. The EDAC circuit includes a first input for receiving first data and parity information stored by a first memory device and a second input for receiving second data and parity information stored by a second memory device. First parity check logic calculates parity for the received first data and parity information. Second parity check logic calculates parity for the received second data and parity information. Bit comparison logic detects differences between the first data and the second data, and between the first parity information and the second parity information. Based on the parity check calculated for the first and second data, and the bit comparison, data select logic selects either the first data or the second data for provision to a data bus.

Abstract: An apparatus configured to detect rotation of a shaft includes a sensor configured to detect a first tooth from among a plurality of teeth located circumferentially on a rotating shaft and a processor configured to determined whether the first tooth is located within a predetermined range of a missing tooth, and configured to calculate at least one of shaft position data and shaft rotation speed data having data corresponding to the first tooth omitted based on the determination that the first tooth is located within the predetermined range of the missing tooth.

Abstract: A system comprises a vibration sensor for generating a vibration signal on a turbomachine, a signal conditioner for conditioning the vibration signal, and a test signal generator for calibrating the signal conditioner. The test signal generator calibrates the signal conditioner with a test signal having a base frequency and a modulation frequency. The signal conditioner introduces a phase error into the vibration signal, and the signal conditioner introduces a phase shift into the test signal. A processor compensates for the phase error in the vibration signal by correcting the vibration signal based on the phase shift in the test signal, where the processor determines the phase shift in the test signal based on harmonic analysis of the modulation frequency.

Abstract: An error detection and correction (EDAC) circuit mitigates the effect of single event upsets (SEU) events in a redundant memory system. The EDAC circuit includes a first input for receiving first data and parity information stored by a first memory device and a second input for receiving second data and parity information stored by a second memory device. First parity check logic calculates parity for the received first data and parity information. Second parity check logic calculates parity for the received second data and parity information. Bit comparison logic detects differences between the first data and the second data, and between the first parity information and the second parity information. Based on the parity check calculated for the first and second data, and the bit comparison, data select logic selects either the first data or the second data for provision to a data bus.

Abstract: A method of changing-over engines in an engine test cell having a dynamometer and a dynamometer shaft defining a centerline, where the engine crankshaft defines a crankshaft centerline, includes the steps of providing a plurality of engine stands in predetermined locations in the test cell with respect to the dynamometer, attaching a set of mount assemblies to the engine in predetermined locations on the engine with respect to the crankshaft, where the set of mount assemblies is specific to the engine, and attaching the set of mount assemblies to the plurality of engine stands. Upon attachment of the set of mount assemblies to the engine and to the engine stands, the crankshaft centerline and the dynamometer centerline are automatically aligned without adjustment of the engine stands or of the set of mount assemblies.

Abstract: An improved system is disclosed for downloading, verifying, and/or testing software from a remote programmer to an Electronic Engine Control ("E.E.C.") unit on a gas turbine engine. The invention includes a remote programmer that communicates with the E.E.C. unit through a serial communications link. The E.E.C. unit receives the communications through a serial memory that transmits them to a shared memory and on through a central processing unit ("C.P.U.") to a program memory. A redundant control circuit is controlled by the remote programmer and directs the E.E.C. unit through three operational modes. In a first, or download/verify, mode of operation, the E.E.C. unit may receive and store a boot program. In a second, or program memory, mode, the C.P.U. executes the boot program to allow the C.P.U. to read from and/or write to the program memory in response to communications from the serial channel. In a third, or normal, mode of operation, the C.P.U.

Abstract: A bracket to support instruments, lamps and other equipment is detachably connected to the lipped channel used in hospital wall and cart constructions. The bracket has a hollow housing having a hole at one end to receive a rod on which the instrument is mounted with a set screw to hold the rod in place. The opposite end of the housing has a first projecting lug to fit inside one lip of the channel. A dog member fits inside the housing and has a projecting second lug to fit inside the other lip of the channel. An adjustment screw fits inside the housing and threadedly engages the dog to move the second lug toward and away from the first lug. When the lugs are close together, they may be inserted between the channel lips at any point along the length of the channel. By turning the adjustment screw, the second lug may be drawn away from the first lug to lock against the channel lips, securing the bracket in position.

Abstract: A railway transportation system for express delivery of cargo anywhere in the system employs standard unit trains operating throughout the system, with the individual cars in the train carrying freight in containerized units which are automatically loaded and/or unloaded at main-line terminals, thereby enabling express, reserve-passenger handling of the freight units. The unit trains are each made up of a fixed number of cars each carrying one of the specially designed containers, with the cars being adapted to automatically unload and load the containers at compatible freight terminals having an unloading station on one side of and adjacent each car of the unit train and a loading station on the opposite side of and adjacent each car when the trains are positioned in the terminal.