Hamilton Sundstrand Corporation

Robert E Cox

James A Gosse

James Saloio

David S Harman

Kimberly K Sendlein

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.

Vibration signal compensation

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.

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Somers, CT, United States of America

Robert E Cox