Apparatus and method for active reduction of the noise emission from jet engines and for jet engine diagnosis
First Claim
1. An apparatus for active reduction of the noise emissions from a jet engine (1) having an air inlet (3), a gas outlet (4) and an engine (5) which is arranged between the air inlet (3) and the gas outlet (4), having:
- (a) at least one first acoustic transducer (7, 7′
) which is arranged in the air inlet (3) upstream of the engine (5), and/or in the gas outlet (4) downstream of the engine (5), for converting sound waves (30) into first signals (31) which are a measure of the frequency, the amplitude and the phase of the soundwaves (30), (b) an electronic control unit (16, 16′
) for converting the first signals (31) into second signals (32), (c) a second acoustic transducer (8) which is arranged centrally in the air inlet (3) upstream of the engine or in a centrally arranged cone upstream of the engine, for converting the second signals (32) into compensation sound waves (33) whose frequency, amplitude and phase are such that the sound waves (30) and the compensation sound waves (33) at least partially cancel one another out and/or (d) a second acoustic transducer (8′
) which is arranged on a centrally arranged holder in the gas outlet (4) downstream of the engine (5), for converting the second signals (32) into compensation sound waves (33) whose frequency, amplitude and phase are such that the sound waves (30) and the compensation sound waves (33) at least partially cancel one another out.
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Accused Products
Abstract
An apparatus and a method for active reduction of the noise emission from a jet engine having an air inlet, a gas outlet and an engine arranged between the air inlet and the gas outlet. A first acoustic transducer is arranged in the air inlet upstream of the engine and/or in the gas outlet downstream of the engine in order to convert sound waves into first signals that are a measure of the frequency, amplitude and phase of the sound waves. An electronic control unit converts the first signals into second signals. A second acoustic transducer is centrally arranged in the air inlet upstream of the engine and/or in the gas outlet downstream of the engine in order to convert the second signals into compensation sound waves whose frequency, amplitude and phase are such that the sound waves and the compensation sound waves at least partially cancel one another out.
20 Citations
34 Claims
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1. An apparatus for active reduction of the noise emissions from a jet engine (1) having an air inlet (3), a gas outlet (4) and an engine (5) which is arranged between the air inlet (3) and the gas outlet (4), having:
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(a) at least one first acoustic transducer (7, 7′
) which is arranged in the air inlet (3) upstream of the engine (5), and/or in the gas outlet (4) downstream of the engine (5), for converting sound waves (30) into first signals (31) which are a measure of the frequency, the amplitude and the phase of the soundwaves (30),(b) an electronic control unit (16, 16′
) for converting the first signals (31) into second signals (32),(c) a second acoustic transducer (8) which is arranged centrally in the air inlet (3) upstream of the engine or in a centrally arranged cone upstream of the engine, for converting the second signals (32) into compensation sound waves (33) whose frequency, amplitude and phase are such that the sound waves (30) and the compensation sound waves (33) at least partially cancel one another out and/or (d) a second acoustic transducer (8′
) which is arranged on a centrally arranged holder in the gas outlet (4) downstream of the engine (5), for converting the second signals (32) into compensation sound waves (33) whose frequency, amplitude and phase are such that the sound waves (30) and the compensation sound waves (33) at least partially cancel one another out. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Method for active reduction of the noise emission from a jet engine (1) having an air inlet (3), a gas outlet (4) and an engine (5) which is arranged between the air inlet (3) and the gas inlet (4), comprising the following steps:
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(a) conversion of sound waves (30) into first signals (31) which are a measure of the frequency, amplitude and phase of the sound waves (30), in at least one first acoustic transducer (7, 7′
) which is arranged in the air inlet (3) upstream of the engine (5), and/or in the gas outlet (4) downstream of the engine (5),(b) conversion of the first signals (31) into second signals (32) in an electronic control unit (16, 16′
),(c) conversion of the second signals (32) into compensation sound waves (33) whose frequency, amplitude and phase are such that the sound waves (30) and the compensation sound waves (33) at least partially cancel one another out, in a second acoustic transducer (8) which is arranged centrally in the air inlet (3) upstream of the engine (5) or in a centrally arranged cone upstream of the engine (5) and/or (d) conversion of the second signals (32) into compensation sound waves (33) whose frequency, amplitude and phase are such that the sound waves (30) and the compensation sound waves (33) at least partially cancel one another out, in a second acoustic transducer (8′
) which is arranged on a centrally arranged holder in the gas outlet (4) downstream of the engine (5). - View Dependent Claims (13, 14, 15, 16, 17)
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18. An apparatus for active reduction of noise emissions from a jet engine comprising an air inlet, a gas outlet, and an engine arranged between the air inlet and the gas outlet, comprising:
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at least one first acoustic transducer arranged in the air inlet upstream of the engine and/or in the gas outlet downstream of the engine and configured to convert sound waves into first signals which are a measure of a frequency, an amplitude and a phase of the sound waves;
an electronic control unit configured to convert the first signals into second signals; and
at least one second acoustic transducer arranged centrally in at least one of;
the air inlet upstream of the engine, a centrally arranged cone upstream of the engine, or a centrally arranged holder in the gas outlet downstream of the engine, wherein the second acoustic transducer is configured to convert the second signals into compensation sound waves, wherein the sound waves and the compensation sound waves at least partially cancel each other out. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for active reduction of noise emission from a jet engine comprising an air inlet, a gas outlet, and an engine arranged between the air inlet and the gas inlet, wherein the method comprises:
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converting sound waves into first signals which are a measure of a frequency, an amplitude and a phase of the sound waves, wherein said converting is performed by at least one first acoustic transducer arranged in the air inlet upstream of the engine, and/or in the gas outlet downstream of the engine;
converting of the first signals into second signals in an electronic control unit;
converting the second signals into compensation sound waves, wherein the sound waves and the compensation sound waves at least partially cancel one another out, wherein said converting is performed by at least one second acoustic transducer which is centrally arranged in at least one of;
the air inlet upstream of the engine, a centrally arranged cone upstream of the engine, or a centrally arranged holder in the gas outlet downstream of the engine. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification