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US 7,681,440 B2Granted
Method and apparatus for turbine engine dynamic characterization
AssigneePratt & Whitney Canada Corp.
InventorsJean Thomassin, Marc-Andre Gareau
Life of this patent
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Abstract
A method and apparatus for conducting dynamic characterization of a gas turbine engine which involves generating exciting pressure pulses and measuring responses in the engine, and, in one aspect, then analyzing the measured response for engine dynamic characteristics.
Claims14
A method for conducting dynamic characterization of a gas turbine engine, comprising:
- (a) generating a plurality of exciting pressure pulses in series in an air flow passing through a main gas path of the gas turbine engine, the exciting pressure pulses having varying frequencies;
- (b) measuring a response in at least one location of the gas turbine engine, excited by the exciting pressure pulses with varying frequencies;
- and
- (c) analyzing the measured response for engine dynamic characteristics, wherein the measured response is a structural vibratory response of an engine mechanical structure.
1 more element
An apparatus for gas turbine engine dynamic characterization comprising:
- a passage adapted to be connected to the gas turbine engine in fluid communication with a main as path of the gas turbine engine;
- a mechanism including a body having a plurality of openings, the body being rotatable in the airflow to alternately open and block the passage for generating a series of exciting pressure pulses in the airflow;
- and
- a motor adapted to rotate the body in a varying rotational speed to change frequencies of the generated exciting pressure pulses.
1 more element
An apparatus for generating a plurality of pressure pulses in an air flow for testing dynamic characteristics of a gas turbine engine, the apparatus comprising:
- an air flow passage adapted to be connected to the gas turbine engine to allow an air flow to be injected into or bled from a main gas path of the gas turbine engine;
- and
- a pressure pulsing device including a rotating body for generating the plurality of pressure pulses in the air flow with varying frequencies, the rotating body intermittently interrupting the air flow provided through the air flow passage.
Dependencies are inferred from the claim text.