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Showing 1 to 8 of 8 for “"Herschel-Quincke Tube"”.
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Investigation of the Herschel-Quincke tube concept in a rectangular lined duct
In this research an innovative combination of the Herschel-Quincke tubes and traditional liners is proposed for application in noise reduction of aircraft engines. The approach consists of installing Herschel-Quincke (HQ) tubes on lined rectangular ducts. An analytical model was developed to …
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Investigation of the Herschel-Quincke Tube Concept as a Noise Control Device for Turbofan Engines
An innovative implementation of the Herschel-Quincke tubes concept for the reduction of noise from turbofan engines is proposed here. The approach consists of installing circumferential arrays of Herschel-Quincke (HQ) tubes or waveguides in the inlet of the turbofan engine. An analytical technique …
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Application of the Herschel-Quincke Tube Concept to Higher-Order Acoustic Modes in Two-Dimensional Ducts
The application of the Hershcel-Quincke (HQ) tube as a noise reduction device for one-dimensional plane-wave sound fields has been studied in great detail in previous years. In this thesis, an analytical technique is developed to investigate the potential of the HQ tube concept to control …
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Modeling and validation of a syntactic foam lining for noise control devices for fluid power systems
… such as Helmholtz resonators, tuning coils, and Herschel-Quincke tubes are generally too large for fluid power systems unless the speed of sound in the device can be reduced. A compliant lining can achieve this effect, but compliance (and lossy compliance) has had little attention in noise …
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Fundamental Studies of the Herschel-Quinke Tube Concept with Mode Measurements
A fundamental study of the Herschel-Quincke (HQ) tube concept for the reduction of noise in circular ducts is presented here. Recent testing of the Herschel-Quincke tube concept on the Pratt-Whitney JT15D and AlliedSignal TFE731-60 engines showed the potential for the practical application of this …
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Theoretical Modeling with Validation of a Combined HQ-Liner System for Turbofan Engine Noise Control
… of traditional passive acoustic liners with Herschel-Quincke (HQ) waveguides is proposed in this work as a device for Turbofan Engine Noise Control. The approach consists of installing circumferential arrays of HQ tubes on the lined sector of the inlet of a turbofan engine. A theoretical …
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Passive damping mechanism of Herschel-Quincke tubes for pressure pulsations in piping systems
… resonance. Passive damping devices such as the Herschel-Quincke (HQ) Tube can be implemented into a resonant system to mitigate the pressure pulsations. Some practical considerations have been clarified in the current work which include the normalization of the transmission loss with respect to …
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Modeling of Herschel/Quincke-Liner Systems for the Control of Aft Fan Radiation in Turbofan Engines
… investigations Alonso et al. have combined Herschel/Quincke (HQ) tubes with liners. This combination has the potential of effectively controlling pure tones and broadband noise in inlet sections of modern turbofan engines. Since a comprehensive approach for engine noise reduction will …