Relevant bibliographies by topics / Air ducts – Noise ; Noise control

Academic literature on the topic 'Air ducts – Noise ; Noise control'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Air ducts – Noise ; Noise control"

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Liu, Xiaobo, Zhongcheng Jiang, Xianfeng Wang, and Dengke Li. "Noise distribution law of air-conditioning ducts for metro vehicles." Noise Control Engineering Journal 70, no. 4 (July 1, 2022): 376–83. http://dx.doi.org/10.3397/1/377030.

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The passenger comforts are directly affected by the air supply uniformity and noise of air-conditioning duct inside the metro vehicle. In order to solve the integrated design problem of air supply uniformity and noise control of air-conditioning ducts, a theoretical model is established to analyze the air supply uniformity, noise attenuation, and airflow regeneration noise of the air-conditioning duct. The distribution law of the sound pressure level along the longitudinal air outlet was calculated, and the calculated results were compared with test ones. For a typical air supply duct with a constant cross section: (1) In order to ensure air supply uniformity at the outlet of the static pressure chamber, the area of the side air hole should be gradually increased in an exponential form along the direction of the main flow, and cannot be designed in the equal area form. (2) The airflow speed of each side hole decreased in sequence along the air duct length. In order to ensure the uniformity air supply of each side hole, the area of each side hole must be gradually increased. (3) The noise in the air conditioner duct was mainly concentrated at the front end of the air duct, and the noise at the subsequent air outlet can fully meet the current requirements of subway vehicles for indoor noise. Therefore, the front end of the air duct is the most important area for noise control.
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Hamada, Hareo, Tanetoshi Miura, Minoru Takahashi, and Yoshitaka Oguri. "An adaptive noise control system in air‐conditioning ducts." Journal of the Acoustical Society of America 84, S1 (November 1988): S180. http://dx.doi.org/10.1121/1.2026004.

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Mahmoud Kamel, Mohamed, EL-Sayed Soliman Ahmed Said, and Ragab Mohamed AL-Sagheer. "Duct quiet zones utilization for an enhancement the acoustical air-condition noise control." International Journal of Electrical and Computer Engineering (IJECE) 12, no. 5 (October 1, 2022): 4915. http://dx.doi.org/10.11591/ijece.v12i5.pp4915-4925.

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<p class="TableParagraph">This paper investigates the duct’s noise distribution pattern due to the heating, ventilation, and air conditioning systems. This study is considering the longitudinal sound wave distribution that can permit a higher reduction of these heating, ventilation, and air conditioning systems duct noise. The proposed technique is depending on the lowest sound pressure level points in the duct or duct quiet zones. Moreover, each heating, ventilation, and air conditioning systems duct has several quiet zones, depending on the sound pressure level of the fan noise source and the duct length as well as the duct diameter. Furthermore, the noise standing wave has a wavelength (λ) which is the distance between two successive quiet zones. This work utilizes orthogonal acoustical noise with the standing wave via feed-forward control speakers. This system confirmed that the distance (λ) is linearly proportional to the duct source noise level. This system noise reduction enhancement has been fulfilled by installing further noise feed-forward control speakers at different duct quiet zones. The system simulation results were displaying satisfactory agreement with the field experimental results.</p>
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Dandaroy, Indranil, S. Reynold Chu, Jeffrey Dornak, and Christopher S. Allen. "Development of acoustic mufflers for cabin noise reduction in Orion spacecraft." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 568–76. http://dx.doi.org/10.3397/in-2021-1568.

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Controlling cabin acoustic noise levels in the Crew Module (CM) of the Orion spacecraft is critical for adequate speech intelligibility, avoid fatigue, and prevent any possibility of temporary and permanent hearing loss to the crew. The primary source of cabin noise for the on-orbit phase of the mission is from the Environmental Control and Life Support System (ECLSS) which recycles and conditions breathing air and maintains cabin pressurization through its ducting network and components. Unfortunately, as a side effect, noise from the ECLSS fans propagates through theses ducts and emanate into the cabin habitable volume via the ECLSS inlet and outlets. To mitigate excessive duct-borne noise, two ECLSS mufflers have been designed to provide significant acoustic transmission loss (TL) so that the cabin noise requirements can be met. Each muffler is meant to be installed in the ducting of the ECLSS air inlet and outlet sides, respectively. Packaging constraints and tight volume requirements necessitated the mufflers to be of complex geometry and compatible with the bends of the ECLSS duct layout. To design and characterize the acoustic performance of the inlet and outlet mufflers, computational acoustic models were developed using the Finite Element Method (FEM) with software. Characterization of the acoustic material and perforations in the mufflers were addressed with poro-elastic theory. Once the mufflers were designed on paper and its TL predicted, prototypes of these mufflers were created using additive manufacturing. The muffler prototypes were subsequently tested for acoustic TL in the laboratory with various configurations of acoustic materials. Comparing the analytical predictions to the test performance yielded excellent correlation for acoustic TL and demonstrated significant broadband noise attenuation. The ECLSS mufflers are currently scheduled to be installed on the Artemis II CM of the Orion spacecraft and will provide significant cabin comfort to crew during the mission.
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Takahashi, Minoru, Takashi Kuribayashi, Kinichiro Asami, Takashi Enokida, Hareo Hamada, and Tanetoshi Miura. "Broadband active sound control system for air-conditioning duct noise." Journal of the Acoustical Society of Japan (E) 8, no. 6 (1987): 263–69. http://dx.doi.org/10.1250/ast.8.263.

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Egana, Juan M., Javier Diaz, and Jordi Vinolas. "Active control of low-frequency broadband air-conditioning duct noise." Noise Control Engineering Journal 51, no. 5 (2003): 292. http://dx.doi.org/10.3397/1.2839725.

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Hamada, Hareo. "Special edition. Recent audio engineering. 4. Control of sound fields. 4-2. Noise control of air-conditioning ducts." Journal of the Institute of Television Engineers of Japan 44, no. 3 (1990): 236–38. http://dx.doi.org/10.3169/itej1978.44.236.

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Wu, Zhenghui, Shuiqing Zhou, Yuebing Li, Weiya Jin, and Yu Luo. "Air Duct Optimization Design Based on Local Turbulence Loss Analysis and IMOCS Algorithm." Machines 11, no. 2 (January 18, 2023): 129. http://dx.doi.org/10.3390/machines11020129.

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Considering the complex flow state of the duct flow field in the exhaust system, the structural parameters can significantly impact the internal flow field and noise. This paper takes the noise generated by the duct system under operating conditions as the research object, studies the mechanism of duct noise generation through theoretical analysis, numerical simulation and experimental test, and proposes an optimization design method, that is, to improve the duct structure by adding duct guide vanes. In order to maximize the optimization effect of the guide vane, a multiobjective optimization design of its profile is required, including the parametric expression of the guide vane profile, establishing the design variables and optimization objectives, and establishing the Kriging approximation model. The IMOCS algorithm is used to accurately and efficiently calculate the Pareto front solution to obtain the optimal profile of the duct guide vane and finally improve the noise-reduction performance of the duct system. This paper applies this design method to an integrated stove head duct to verify its accuracy, and prototype tests are conducted according to the optimization results. The test results show that the optimized integrated cooker has improved the outlet flow rate of the whole machine by 1.2 m3/min and reduced the noise by 2.3 dB.
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Hoshino, Tsutomu, Tadashi Ohashi, and Juro Ohga. "Use of rectifying meshes for active noise control in an air flow duct." Journal of the Acoustical Society of Japan (E) 20, no. 6 (1999): 439–43. http://dx.doi.org/10.1250/ast.20.439.

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Madadnia, Jafar, Deepak Kala, Dheerej Pillai, and Homa Koosha. "Design, Build and Testing of a Noise-Free Twin Shaft Co-Axial Wind Turbine for UTS Buildings." Advanced Materials Research 452-453 (January 2012): 1089–93. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.1089.

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Management and control of noise pollution in wind turbines are important to integrate wind turbines in building and urban areas. A scaled model of a horizontal-co-axial wind turbine was designed, built and tested in the wind tunnel of University of Technology Sydney (UTS) and its characteristics and aerodynamic-noise emissions were analyzed. The noise reduction capability of the horizontal-twin-shaft wind turbines was compared with wind turbines with the conical entry nozzle (stator), duct-shroud-envelop and vertical shafts. Air velocity, shaft rpm, electric-power generation, noise frequency and amplitude were measured. It was found that up to 15% reduction in the amplitude (dB) of noise emisit from twin shaft wind turbine compared to the single shaft bench mark turbine. The noise analysis performed as a result of these experiments may be used in the design and selection of a building integrated horizontal axis wind turbine for applications at UTS buildings.
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Dissertations / Theses on the topic "Air ducts – Noise ; Noise control"

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Trinder, M. C. J. "Active noise control in finite length ducts." Thesis, University of Essex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371924.

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McNicol, Ian David. "Active adaptive cancellation of sound in ducts /." Title page, contents and synopsis only, 1985. http://web4.library.adelaide.edu.au/theses/09ENS/09ensm169.pdf.

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Uosukainen, Seppo. "JMC method applied to active control of sound : theoretical extensions and new source configurations /." Espoo [Finland] : Technical Research Centre of Finland, 1999. http://www.vtt.fi/inf/pdf/publications/1999/P386.pdf.

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Snyder, Scott D. "A fundamental study of active noise control system design /." Title page, contents and abstract only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phs675.pdf.

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Slagley, Jeremy Michael. "Effects of diameter and cross-sectional partitioning on active noise control in round ducts." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4490.

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Thesis (Ph. D.)--West Virginia University, 2006.
Title from document title page. Document formatted into pages; contains ix, 77 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 75-77).
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Farooqui, Maaz. "Innovative noise control in ducts." Doctoral thesis, KTH, Farkost och flyg, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192927.

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The objective of this doctoral thesis is to study three different innovative noise control techniques in ducts namely: acoustic metamaterials, porous absorbers and microperforates. There has been a lot of research done on all these three topics in the context of duct acoustics. This research will assess the potential of the acoustic metamaterial technique and compare to the use of conventional methods using microperforated plates and/or porous materials.  The objective of the metamaterials part is to develop a physical approach to model and synthesize bulk moduli and densities to feasibly control the wave propagation pattern, creating quiet zones in the targeted fluid domain. This is achieved using an array of locally resonant metallic patches. In addition to this, a novel thin slow sound material is also proposed in the acoustic metamaterial part of this thesis. This slow sound material is a quasi-labyrinthine structure flush mounted to a duct, comprising of coplanar quarter wavelength resonators that aims to slow the speed of sound at selective resonance frequencies. A good agreement between theoretical analysis and experimental measurements is demonstrated. The second technique is based on acoustic porous foam and it is about modeling and characterization of a novel porous metallic foam absorber inside ducts. This material proved to be a similar or better sound absorber compared to the conventional porous absorbers, but with robust and less degradable properties. Material characterization of this porous absorber from a simple transfer matrix measurement is proposed.The last part of this research is focused on impedance of perforates with grazing flow on both sides. Modeling of the double sided grazing flow impedance is done using a modified version of an inverse semi-analytical technique. A minimization scheme is used to find the liner impedance value in the complex plane to match the calculated sound field to the measured one at the microphone positions.

QC 20160923

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Chan, T. M. "Active control of sound in ducts." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390327.

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Mak, Cheuk-Ming. "The application of computational fluid dynamics to the prediction of regenerated noise in ventilation systems." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321131.

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Blondel, Laurent Armand. "Compressed air acoustic sources for active noise control." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246196.

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Homma, Kenji. "Compact Integrated Active-Passive Approach for Axial Fan Noise Control." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29067.

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A new active-passive approach for the control of noise radiated from a small axial fan was investigated. The approach involved the installation of an axial fan into a short duct with both passive and active noise control functions. First, a systematic methodology for the analytical modeling of finite-length ducts with multiple discontinuities was formulated. The procedure involved the modeling of a duct as a collection of simple duct sections, which were interconnected at multiple junctions. Analytical studies have shown that a short lined duct provides passive noise reduction effects through the mass-loading effect of the duct air volume at low frequencies and the sound absorption by a passive liner at high frequencies. It was also shown that active control can provide further noise attenuations at low-to-mid frequencies, thereby enhancing the overall noise control performance. Two alternate designs of active-passive noise control fan duct were considered. One was a simple non- segmented duct with a 2x2 active control and the other was an internally segmented duct with an 8x8 active control. It was indicated that the latter design possesses a significantly higher global noise control potential than the former with respect to both bandwidth and attenuation level. This was attributed to the reduction of the unwanted pressure contributions from the duct cross modes through the high frequency shifting of the associated cut-on frequencies. The experimental validation of the noise control approach was also carried out. An active-passive noise control fan duct incorporating the segmented duct design with 8x8 active control was constructed in conjunction with a hybrid feedforward-feedback control system. Experimental results have shown significant reductions in the total fan noise power associated with the first four BPF tones by the feedforward control and the broadband fan noise power by the feedback control. The overall active-passive noise control characteristics were observed to be in accordance with the analytical results.
Ph. D.
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Books on the topic "Air ducts – Noise ; Noise control"

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Uosukainen, Seppo. JMC method applied to active control of sound: Theoretical extensions and new source configurations. Espoo [Finland]: Technical Research Centre of Finland, 1999.

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Silcox, Richard J. Active control of multi-dimensional random sound in ducts. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Reynolds, Douglas D. Algorithms for HVAC acoustics. Atlanta, Ga: American Society of Heating, Refrigerating and Air-Conditioning Engineers, 1991.

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Wang, Lawrence K., Norman C. Pereira, and Yung-Tse Hung, eds. Advanced Air and Noise Pollution Control. Totowa, NJ: Humana Press, 2005. http://dx.doi.org/10.1007/978-1-59259-779-6.

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Bailey, Donna. Noise and fumes. New York: F. Watts, 1991.

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Ontario. Ministry of Environment and Energy. Guide to applying for approval (Air): Noise and vibration. [Toronto, Ont.]: Queen's Printer for Ontario, 1995.

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Uosukainen, Seppo. Unidirectional JMC actuators and their approximations in the active attenuation of noise in ducts. Espoo: Technical Research Centre of Finland, 1998.

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American Society of Heating, Refrigerating and Air-Conditioning Engineers., ed. A practical guide to noise and vibration control for HVAC systems. Atlanta, Ga: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1993.

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E, Schaffer Mark. A practical guide to noise and vibration control for HVAC systems. 2nd ed. Atlanta, GA: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, 2011.

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E, Schaffer Mark. A practical guide to noise and vibration control for HVAC systems. Atlanta, Ga: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1991.

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Book chapters on the topic "Air ducts – Noise ; Noise control"

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Snyder, Scott D. "Control of Sound Propagation in Ducts." In Active Noise Control Primer, 81–94. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4419-8560-6_6.

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Dogra, Sourabh, and Arpan Gupta. "Low-Frequency Noise Control in Ducts." In Lecture Notes in Mechanical Engineering, 527–35. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6738-1_43.

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Brunner, Calvin R. "Noise Generation and Control." In Hazardous Air Emissions from Incineration, 181–91. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2539-0_18.

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Wang, Chunqi, Yumin Zhang, and Lixi Huang. "Broadband Noise Control in Ducts via Electro-Mechanical Coupling." In Fluid-Structure-Sound Interactions and Control, 101–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48868-3_16.

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Yeh, James T., and Wei-Yin Chen. "Control of NO x During Stationary Combustion." In Advanced Air and Noise Pollution Control, 113–26. Totowa, NJ: Humana Press, 2005. http://dx.doi.org/10.1007/978-1-59259-779-6_4.

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Fuchs, Helmut V. "Silencers in Flow Ducts." In Applied Acoustics: Concepts, Absorbers, and Silencers for Acoustical Comfort and Noise Control, 507–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-29367-2_13.

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Bennett, Gareth J., and Kun Zhao. "Air Curtain Flow Control for Aerodynamic Noise Reduction." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 279–95. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52429-6_18.

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Lovegrove, Gord. "Lighting, Noise and Vibration Control, and Air Quality." In Engineering for Sustainable Communities, 255–67. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784414811.ch17.

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Majumdar, Dipanjali. "Air, Noise and Odour Pollution and Control Technologies." In Environmental Management: Issues and Concerns in Developing Countries, 61–78. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-62529-0_4.

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Manivasagam, S., and J. Senthilnathan. "Compressor Related Noise Control in Air-Conditioners and Refrigerators." In IUTAM Symposium on Designing for Quietness, 237–46. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-0095-5_14.

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Conference papers on the topic "Air ducts – Noise ; Noise control"

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Li, Yugang, Aniket Malatpure, Christopher D. Rahn, and Darren M. Dawson. "Adaptive Noise Isolation in Finite Ducts." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1771.

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Abstract Noise from jet engines, vehicle exhaust systems, and heating, ventilation, and air conditioning systems often involves planar acoustic wave propagation through finite ducts. This paper introduces controllers that use a loudspeaker actuator and two microphone pressure sensors to adaptively decouple adjacent ducts, thereby isolating a quiet duct from bounded disturbances in an adjacent noisy duct. The system model includes a one dimensional displacement-based partial differential equation for planar noise propagation in the two ducts and an ordinary differential equation for the speaker dynamics. Based on Lyapunov theory, Exact Model Knowledge and adaptive isolation controllers exponentially and asymptotically regulate the controlled duct from bounded disturbances in the uncontrolled duct, respectively, while ensuring bounded uncontrolled duct response and control voltage.
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Clark, Ray C., and Julius C. Mekwinski. "Gas Turbine Engine Noise Control Using Fiber Metal Lined Ducts." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-433.

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Fiber metal acoustic sheet materials are used in lined duct sound absorbers for gas turbine engine noise. Duct treatment utilizes a fiber metal face sheet backed by a cavity of controlled depth. The fiber metal facing and cavity depth provide a tuned system that is broadly effective in a desired frequency band. Fiber metal lined ducts are used in engine applications such as fan ducts, inlet cowls, auxiliary power units and environmental control systems. This approach is used in engine treatments to provide effective absorption within engine limits of weight and space. This paper discusses design methodology for fiber metal ducts. Topics include frequency tuning the absorber, treated area versus noise reduction, matching the acoustical impedance of the fiber metal to the air in the duct, the effects of flow and sound pressure level in the duct on noise reduction, and an example of noise reduction achieved in an engine application.
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Omana, E., and D. Dager. "264. Study of Active Noise Control in Air-Conditioning Ducts." In AIHce 2001. AIHA, 2001. http://dx.doi.org/10.3320/1.2765791.

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Nagarkatti, S. P., F. Zhang, C. D. Rahn, and D. M. Dawson. "Backstepping boundary control for noise reduction in finite ducts." In 1999 IEEE/ASME International Conference on Advanced Intelligent Mechatronics. IEEE, 1999. http://dx.doi.org/10.1109/aim.1999.803281.

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Liu, Zheji, and Mark J. Kuzdzal. "Noise Control of an 11,000 Horsepower Single Stage Pipeline Centrifugal Compressor." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27422.

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Centrifugal compressors installed for natural gas transmission produce significant noise. Many of these compressors have a single impeller with high power input. Large diameter pipes are typically connected to the inlet and discharge of the compressors. As a result, a single stage pipeline compressor not only has a strong noise source but also has a large structure to radiate noise to the ambient. As pipeline compressors are installed close to residential areas, community noise complaints become a concern to pipeline companies and compressor manufacturers. To make compressors more environmentally friendly, duct resonator acoustic arrays have been developed to lower the acoustic energy emanating to the environment. This paper focuses on acoustic technology applied to a single stage pipeline direct-inlet compressor with a 28-inch diameter impeller. The effectiveness of the duct resonator acoustic array is described in this paper with field noise data from three different tests — one test before the compressor was retrofitted with the resonator arrays and two tests afterwards. A baseline noise test was first conducted in January 2002 to obtain the compressor noise signature and to establish the baseline noise data. Using the baseline noise data, duct resonator arrays were designed, manufactured, and retrofitted into the compressor to reduce noise. A second test was performed in October 2002, just after the upgrade, to check the effectiveness of the resonator arrays. The compressor was tested under six different operating points (two speed lines at three points per speed line) from overload to surge during both the first and the second tests. In February 2004, fifteen months after the second test, a third noise test of the same unit was performed to assess the effectiveness of the resonator array over time. The purpose of this third test was to identify if there was any degradation of noise attenuation due to fouling. A comparison of the data taken on the third noise survey with those measured on the second noise survey indicated there was no change in noise levels. After the third test, the unit was disassembled for an aerodynamic retrofit. At this point, the array was inspected and found to be clean. This indicates that the duct resonator array has been performing well since its installation. Fouling has not been detected and the array performance did not degrade over time. This paper provides acoustic data for all three field tests conducted with a focus on the technology applied to reduce the acoustic energy of this centrifugal compressor.
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Wallin, Fredrik, and Lars-Erik Eriksson. "Design of an Aggressive Flow-Controlled Turbine Duct." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51202.

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Demands on improved efficiency, reduced emissions and noise restrictions result in the need for very high by-pass ratio turbo-fan engines. Large fans and small high-pressure cores require aggressive intermediate transition ducts connecting the low-pressure and high-pressure systems. In the present work the design of an aggressive flow-controlled turbine duct is presented. A number of vortex generators are installed in a turbine duct to control the boundary layer. The objective is to suppress the existing separation and thus minimize overall duct loss. In doing so the turbine duct design space will be extended toward more aggressive configurations. By using response surface methodology, together with design of experiments based on computational fluid dynamics (CFD), an optimum flow control arrangement is determined. A vortex generator model was adopted in order to be able to investigate a large number of different configurations. The vortex generator installation is optimized with respect to vortex generator position, height, length and angle of attack.
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Ohta, Yutaka, and Eisuke Outa. "Noise Reduction of Blade-Passing Frequency Components in a Centrifugal Blower." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53302.

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A hybrid-type noise control method is applied to fundamental and higher-order blade-passing frequency components, abbreviated to BPF components, radiated from a centrifugal blower. An active cancellation of the BPF noise source is conducted based on a detailed investigation of the noise source distribution by using correlation analysis. The sound pressure level of 2nd- and/or 3rd-order BPF can be reduced by more than 15 decibels and discrete tones almost eliminate from the power spectra of blower-radiated noise. On the other hand, the sound pressure level of the fundamental BPF is difficult to reduce effectively by the active cancellation method because of the large amplitude of the noise source fluctuation. However, the fundamental BPF is largely influenced by the frequency-response characteristics of the noise transmission passage, and is passively reduced by appropriate adjusting of the inlet duct length. Simultaneous reduction of BPF noise, therefore, can be easily made possible by applying passive and active control methods on the fundamental and higher-order BPF noise, respectively. We also discuss the distribution pattern of BPF noise sources by numerical simulation of flow fields around the scroll cutoff.
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Scarinci, Tomas, Christopher Freeman, and Ivor Day. "Passive Control of Combustion Instability in a Low Emissions Aeroderivative Gas Turbine." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53767.

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This paper describes the conceptual ideas, the theoretical validation, the laboratory testing and the field trials of a recently patented fuel-air mixing device for use in high-pressure ratio, low emissions, gaseous-fueled gas turbines. By making the fuel-air mixing process insensitive to pressure fluctuations in the combustion chamber, it is possible to avoid the common problem of positive feedback between mixture strength and the unsteady combustion process. More specifically, a mixing duct has been designed such that fuel-air ratio fluctuations over a wide range of frequencies can be damped out by passive design means. By scaling the design in such a way that the range of damped frequencies covers the frequency spectrum of the acoustic modes in the combustor, the instability mechanism can be removed. After systematic development, this design philosophy was successfully applied to a 35:1 pressure ratio aeroderivative gas turbine yielding very low noise levels and very competitive NOx and CO measurements. The development of the new premixer is described from conceptual origins through analytic and CFD evaluation to laboratory testing and final field trials. Also included in this paper are comments about the practical issues of mixing, flashback resistance and autoignition.
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9

Schram, Christophe, Julien Christophe, Ralf Corin, Hervé Denayer, Wim De Roeck, Stefan Sack, and Mats Åbom. "Innovative noise control in ducts." In 23rd AIAA/CEAS Aeroacoustics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-4038.

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10

Bohn, Dieter, James F. Willie, and Nils Ohlendorf. "Thermoacoustic Modeling and Transfer Functions Determination for a Matrix Burner Using Unsteady CFD." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50370.

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Turbulent combustion of a lean premixed methane-air mixture is simulated numerically using unsteady CFD. The configuration is a matrix burner suitable for stationary gas turbine applications. The geometry consists of the following: seven slots which constitute the flame holder for stabilizing the flame, a diffuser which serves the purpose of lowering the pressure loss across the burner and a combustion chamber. A contraction ensures that a recirculation zone is created close to the exit of the flame holder for anchoring and stabilizing the flame. Fuel is injected in 112 holes, 8 along each end of the 7 slots. The injected fuel meets the in-coming high velocity air stream for mixing to begin in the premixed ducts before finally entering the combustion chamber. This paper validates the cold flow velocity field and the steady flame results from CFD with measurements and investigates combustion instability in a matrix burner, the onset of which can be attributed to changes in flow variables using URANS. Particularly, the effect of the mixture strength variation caused by fluctuations in the velocity field on the unsteady heat rate inside the combustor is investigated. The fuel inlet is assumed to be choked due to the high pressure drop across it. The time lag between the time fuel is injected and the time it reaches the flame front is estimated. Quantifying this time delay (or “flight time”) helps to characterize the burner with respect to thermo-acoustic instabilities. The flame frequency response to a white noise forcing at the air inlet is determined. This is followed by the determination of the acoustic transfer matrix linking the pressure and velocity downstream and upstream of the burner/flame. This is done by using system identification that is common in control theory. The determined flame frequency response and the time lag are used in a 1D acoustic network code for determining the longitudinal eigenmodes of the combustor of the matrix burner.
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Reports on the topic "Air ducts – Noise ; Noise control"

1

Nelson, Jonathan P. Active Control of Fan Noise in Ducts Using Magnetic Bearings. Fort Belvoir, VA: Defense Technical Information Center, May 2002. http://dx.doi.org/10.21236/ada403756.

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2

Slagley, Jeremy M., and Steven E. Guffey. Part I - Effects of Diameter on Active Noise Control in Rectangular and Round Ducts. Fort Belvoir, VA: Defense Technical Information Center, May 2006. http://dx.doi.org/10.21236/ada447684.

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3

Slagley, Jeremy M., and Steven E. Guffey. Part II - Effects of Cross-Sectional Partitioning on Active Noise Control in Round Ducts. Fort Belvoir, VA: Defense Technical Information Center, May 2006. http://dx.doi.org/10.21236/ada447685.

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