Vibration monitoring system for an aircraft engine
First Claim
1. A vibration monitoring system for an aircraft engine, comprising at least two measuring feelers responsive to vibration, such feelers having similar characteristics and being exposed to the same vibration, means for producing measuring signals corresponding to the output at each of said feelers, comparator means for comparing said measuring signals and logic means interconnected with indicating means for detecting and indicating a normal condition when said measuring signals are substantially equal, a defect condition when said measuring signals differ from each other and an alarm condition when both said measuring signals exceed a safety limit.
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Abstract
A monitoring system for detecting and indicating typical operating conditions, particularly vibration of an aircraft engine, wherein at least two measuring feelers such as accelerometers are exposed to the same conditions, the output signals from said feeler are compared with each other and logical means detect normal conditions when the output signals are equal, system defect conditions when the output signals differ from each other and alarm conditions when the output signals both exceed a safety limit. Such a system greatly increases the reliability and at the same time avoids false alarms.
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Citations
12 Claims
- 1. A vibration monitoring system for an aircraft engine, comprising at least two measuring feelers responsive to vibration, such feelers having similar characteristics and being exposed to the same vibration, means for producing measuring signals corresponding to the output at each of said feelers, comparator means for comparing said measuring signals and logic means interconnected with indicating means for detecting and indicating a normal condition when said measuring signals are substantially equal, a defect condition when said measuring signals differ from each other and an alarm condition when both said measuring signals exceed a safety limit.
Specification