Accelerometer configuration
First Claim
1. A vibration measurement system for measuring vibration to detect rotor imbalance and monitor engine health for an aircraft engine, comprising:
- an internally mounted accelerometer for detecting imbalance;
an external accelerometer for detecting rotor imbalance; and
a signal conditioning computer including software for duplicating a signal from the external accelerometer function, modifying said signal by means of an algebraic, and using the modified signal to provide the function of the internally mounted accelerometer if said internally mounted accelerometer fails, and wherein the software defines that a variable whose value represents an amplitude of the internally mounted accelerometer is now equal to a scale factor times an amplitude of the external accelerometer.
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Accused Products
Abstract
The present invention provides a system and method for using the external accelerometer in an aircraft engine configuration as a backup accelerometer, in the event the internally located production accelerometer fails. The sensor location of the external accelerometer has an acceptable sensitivity to fan imbalance, similar to the location of the former alternate accelerometer. The signal from this external accelerometer is duplicated using software in the signal conditioning hardware, creating the second, alternate signal. As an alternative embodiment, the signal may be duplicated by simply teeing or branching the original signal, using hardware rather than software.
74 Citations
18 Claims
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1. A vibration measurement system for measuring vibration to detect rotor imbalance and monitor engine health for an aircraft engine, comprising:
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an internally mounted accelerometer for detecting imbalance;
an external accelerometer for detecting rotor imbalance; and
a signal conditioning computer including software for duplicating a signal from the external accelerometer function, modifying said signal by means of an algebraic, and using the modified signal to provide the function of the internally mounted accelerometer if said internally mounted accelerometer fails, and wherein the software defines that a variable whose value represents an amplitude of the internally mounted accelerometer is now equal to a scale factor times an amplitude of the external accelerometer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring vibration to detect rotor imbalance and monitor engine health for an aircraft engine, comprising the steps of:
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mounting an internal accelerometer for detecting imbalance;
mounting an external accelerometer for detecting rotor imbalance;
providing a signal conditioning computer including software for duplicating a signal from the external accelerometer, modifying said signal by means of an algebraic function, and using the modified signal to provide the function of the internally mounted accelerometer if said internally mounted accelerometer fails; and
providing an algebraic function that is a constant. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification