Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes
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United States of America Patent
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Jun 6, 2006
Grant Date -
Mar 11, 2004
app pub date -
Oct 2, 2001
filing date -
Oct 2, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An assembly useful in reducing aircraft engine noise such as turbofan engine noise (730) comprises: (i) at least one tube 'H-Q' having an inlet end (738), an outlet end (740) and a central tube portion therebetween; and (ii) at least one actuator operatively interconnected to at least one tube, wherein the actuator is capable of causing dynamic response by the tube. The assembly of this invention may be used in a method for reducing noise, the method comprising: (a) providing means for generating non-uniform noise energy about an inner surface and within a disclosure having at least an inlet; (b) providing an assembly for reducing noise comprising; (i) at least one having an inlet end, an outlet end and a central tube portion therebetween, and (ii) at least one actuator operatively interconnected to at least one tube, wherein the actuator is capable of causing dynamic response by the tube; and (c) directing at least a portion of the non-uniform noise into the assembly.
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