Dual rotor vibration monitoring
AssigneeGeneral Electric Company
InventorDaniel Edward Mollmann
Life of this patent
Estimating the term…
Abstract
Vibration is monitored in a dual rotor engine. A first total vibration of the engine is measured during operation. Relative phase of the two rotors is then clocked, and a second total vibration of the engine is then measured during operation. First and second total unbalances are then resolved at a common response frequency from the measured total vibrations. First and second rotor unbalances are then resolved for the corresponding rotors from the first and second total unbalances. In a further method, corresponding corrective balance weights may be determined for offsetting the resolved rotor unbalances.
Claims21
A method of monitoring vibration in a gas turbine engine having a core engine and first and second low pressure turbine rotors comprising:
- running said engine at matching rotary speeds of said rotors and different rotary speed of said core engine;
- measuring a first total vibration of said engine during rotation of said rotors;
- clocking relative phase of said rotors;
- measuring a second total vibration of said engine during rotation of said rotors with said clocked phase therebetween;
- resolving first and second total unbalances at a common response frequency from said measured first and second total vibrations;
- and
- resolving first and second rotor unbalances for said first and second rotors, respectively, from said first and second total unbalances.
A method of monitoring vibration in an engine having first and second rotors comprising:
- measuring a first total vibration of said engine during rotation of said rotors;
- clocking relative phase of said rotors;
- measuring a second total vibration of said engine during rotation of said rotors with said clocked phase therebetween;
- resolving first and second total unbalances at a common response frequency from said measured first and second total vibrations;
- and
- resolving first and second rotor unbalances for said first and second rotors, respectively, from said first and second total unbalances.
An engine comprising:
- first and second rotors;
- a vibration sensor mounted in said engine for measuring total vibration due to rotation of said rotors;
- and
- a vibration monitor operatively joined to said sensor, and configured for first resolving first and second total unbalances at a common response frequency from corresponding first and second total vibrations measured by said sensor at successive times, and further configured for secondly resolving first and second rotor unbalances for said first and second rotors, respectively, from said first and second total unbalances.
Dependencies are inferred from the claim text.