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

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Doige, A. G., and H. S. Alves. "Experimental Characterization of Noise Sources for Duct Acoustics." Journal of Vibration and Acoustics 111, no. 1 (January 1, 1989): 108–14. http://dx.doi.org/10.1115/1.3269804.

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Many industrial applications involving the acoustics of ducting or piping systems require an improved description of noise sources, so that a better prediction and evaluation of system performance can be achieved. Some examples are (a) the computer simulation of intake and exhaust muffler performance, (b) the control of pressure pulsation in fluid piping systems due to control valve flow noise or reciprocating compressors, and (c) predicting pressure fluctuations in heating and air-conditioning system ductwork due to various types of fans or blowers. This paper describes two applications of a well-known linear electrical analogy for obtaining experimentally the internal acoustical source impedance and the strength of the source, both parameters which are independent of the acoustic system load impedance. Two methods are compared, one which utilizes direct measurement of source impedance with the source inactive, and a two-load method from which the source impedance is calculated from measured pressures, with the source in operation. Various applications are presented using a speaker, compressor, engine, and centrifugal fan as noise sources connected to different load impedances. Comparisons are made to highlight the relative merits of these two approaches and to demonstrate the degree of accuracy that can be obtained in predicting noise levels in any arbitrary linear acoustic system, using the measured source parameters. The methods are simple in concept and in application, and while they do not often describe the physical nature of noise sources, they do offer a way to bypass the much more difficult problem of modelling the source theoretically.

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12

Peterman, Karl. "Aerodynamic and acoustical effects caused by placing two prefabricated duct silencers in series." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5664–70. http://dx.doi.org/10.3397/in-2021-3208.

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It once was not uncommon to find ductborne noise control designs and recommendations that would attempt to provide high sound attenuation values, especially for problematic lower frequencies, by using a pair of prefabricated duct silencers in series with one another, sometimes immediately adjacent but typically separated by some distance. Similarly, heating, ventilating, and air-conditioning (HVAC) duct silencers are occasionally required to accommodate fire dampers or access sections that effectively break up the silencer along its length, creating an empty gap between the noise-attenuating internal elements. Typical published performance characteristics of prefabricated duct silencers do not include effects from the use of additional silencers nearby and little information is available in common duct design and application literature. This paper will present information from a series of tests of various silencers in different configurations and spacings in an aero-acoustic test facility that will help describe the effects on insertion loss, generated noise, and pressure drop.

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13

Zhang, Li, Shuo Zhang, and Guang Yuan Nie. "The Acoustic Enclosure Design of the Refrigeration Compressor." Applied Mechanics and Materials 289 (February 2013): 75–80. http://dx.doi.org/10.4028/www.scientific.net/amm.289.75.

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In this paper, in order to reduce the external radiation of food refrigeration compressors noise, the main noise frequency analysis based on the theoretical calculation and practical experiment is carried out and the acoustic enclosure design is conducted. Conventional sound-absorbing material adopts rock wool and glass wool which have poor environmental protection. In the design process the environmental friendly melamine cotton is chosen as the sound-absorbing material that has not ever been massively adopted. Whats more, with a consideration of ventilation and heat dissipation, acoustic enclosure interior is designed with muffler air duct and the low-speed and low-noise fan. Therefore, both the normal operation of the compressor and the sound insulation of the acoustic enclosure are ensured in this way. Then with the sound level meter the noise A-weighted SPLs of the compressor with and without the enclosure are measured and are compared with each other. The results show that after covering the acoustic enclosure the compressors noise is less than 60 dB, which meets the design requirements of noise control. Therefore, it is easy to conclude that the sound insulation of the acoustic enclosure reaches the design standards and the acoustic enclosure design is feasible.

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14

Sutliff, D. L., D. L. Tweedt, E. B. Fite, and E. Envia. "Low-Speed Fan Noise Reduction with Trailing EDGE Blowing." International Journal of Aeroacoustics 1, no. 3 (September 2002): 275–305. http://dx.doi.org/10.1260/147547202320962592.

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An experimental proof-of-concept test was conducted to demonstrate rotor-stator interaction tone noise reduction through rotor trailing edge blowing. The velocity deficit from the viscous wake of the rotor blades was reduced by injecting air into the wake from a trailing edge slot. Composite hollow rotor blades with internal flow passages were designed based on Computational Fluid Dynamics codes modeling the internal flow. The hollow blade with interior guide vanes creates flow channels through which externally supplied air flows from the root of the blade to the trailing edge. The impact of the rotor wake-stator interaction on the acoustics was also predicted analytically. The Active Noise Control Fan, located at the NASA Glenn Research Center, was used as the proof-of-concept test bed. In-duct mode and farfield directivity acoustic data were acquired at blowing rates (defined as mass flow supplied to trailing edge blowing system divided by fan mass flow) ranging from 0.5% to 2.0%. The first three blade passing frequency harmonics at fan rotational speeds of 1700 to 1900 rpm were analyzed. The acoustic tone mode power levels (PWL) in the inlet and exhaust were reduced 11.5&–0.1, 7.2&11.4, 11.8&19.1 PWL dB, respectively. The farfield tone power levels at the first three harmonics were reduced 5.4, 10.6, & 12.4 dB PWL. At selected conditions, two-component hotwire and stator vane unsteady surface pressures were acquired. These measurements show the modification of the rotor wake due to trailing edge blowing and its effect on the stator vane to illustrate the physics behind the noise reduction.

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15

Li, Caoyang, and David Herrin. "Scaled down measurement of HVAC duct insertion loss and comparison to simulation." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, no. 1 (June 24, 2022): 909–16. http://dx.doi.org/10.3397/nc-2022-834.

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Acoustical consultants and noise control engineers regularly rely on the duct attenuation information in the American Society of Heating, Refrigerating, and Air-Conditioning Engineering (ASHRAE) Handbook. The handbook provides duct attenuation on a per length basis in octave bands for a set of standard duct cross-sections. However, acoustical consultants desire additional frequency resolution. Moreover, the handbook is limited to lining thicknesses of either 1 in (2.5 cm) or 2 in (5.1 cm). To fill in some of the gaps in the handbook information, the finite element method is used to determine the insertion loss of rectangular duct cross-sections with wide aspect ratios in 1/3-octave bands on a scaled down version.

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16

Rulik, Sebastian, Włodzimierz Wróblewski, and Krzysztof Rusin. "Numerical and Experimental Analysis of the Noise Generated in a Ducted Cavity Working in Various Conditions." Energies 14, no. 22 (November 11, 2021): 7545. http://dx.doi.org/10.3390/en14227545.

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Flow over a cavity or a gap may induce pressure fluctuations that are emitted as sound waves and perceived by a human as noise. This phenomenon may occur in different kinds of industrial machines or in everyday life devices, e.g., cars. For this reason, it is important to predict the flow conditions that intensify or attenuate the noise. This research paper presents the numerical and experimental analysis of the pressure fluctuations in a deep, ducted cavity. The experimental test stand made it possible to investigate the flow over a cavity with air velocity in the range of 30–80 m/s. The pressure fluctuations were measured using miniature microphones located in the duct and the cavity wall and processed with LabView software. The phenomena were also analysed using the computational fluid dynamics (CFD) technique. The several modelling approaches were tested and validated against the experimental data. The highest sound pressure levels were obtained for 40 and 70 m/s. The sound frequency increased with the flow velocity.

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17

Wang, Heng, and Qibo Mao. "Development and Investigation of Fully Ventilated Deep Subwavelength Absorbers." Symmetry 13, no. 10 (October 1, 2021): 1835. http://dx.doi.org/10.3390/sym13101835.

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A new type of deep subwavelength acoustic metamaterial (AMM) absorber with 100% ventilation is presented in this study. The proposed ventilation absorber consists of coiled-up half-wave resonators (HWRs) and quarter-wave resonators (QWRs). First, the sound absorption and sound transmission performances for absorbers were analyzed considering the thermal viscosity dissipation. Then, the prototype with ten HWRs and three QWRs composed of acrylic plates was manufactured based on the theoretical model. The acoustic performance of the absorber was tested in an air-filled acoustic impedance tube to determine the sound absorption and transmission loss performances. Good agreement was found between the measured and theoretically predicted results. The experimental results show that the proposed ventilation AMM absorber is able to achieve sound absorption in a range between 330 Hz and 460 Hz with a thickness of only 32 mm (about 3% of the wavelength in the air). Furthermore, the sound transmission loss can achieve 17 dB from 330 Hz to 460 Hz. The main advantage of the proposed absorber is that it can be completely ventilated in duct noise control.

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18

Wünsche, Jens N., and John W. Palmer. "Portable Through-flow Cuvette System for Measuring Whole-canopy Gas Exchange of Apple Trees in the Field." HortScience 32, no. 4 (July 1997): 653–58. http://dx.doi.org/10.21273/hortsci.32.4.653.

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A monitoring and control system for sequentially measuring whole-tree-canopy gas exchange of four apple (Malus domestica Borkh.) trees in the field is described. A portable, highly transparent, open-top whole-canopy cuvette was developed for complete enclosure of the above-ground portion of the tree. The flux of whole-canopy CO2 and H2 0 vapor was estimated from differential CO2 concentration and H2O-vapor partial pressure between ambient/reference air entering the cuvette and analysis air leaving the cuvette, as measured by infrared gas analysis. The bulk air-flow rate through the chamber was measured with a Pitot static tube inserted into the air-supply duct and connected to a differential pressure transducer. Performance of the whole-canopy cuvette system was tested for its suitability for gas-exchange measurements under field conditions. The air flow through the whole-canopy cuvette was 22000 L·min-1 (≈5.5 air exchanges/min) during the day, providing adequate air mixing within the cuvette, and 4000 L·min-1 (≈1 air exchange/min) during the night. Daily average leaf temperatures within the cuvette were 2-3 °C higher than to those on trees outside the cuvette. Photosynthetic photon flux transmitted through the chamber walls was at least 92 % of the incident ambient radiation. Moreover, the whole-canopy cuvette was evaluated without tree enclosure to determine the degree of “noise” in differential CO2 concentration and H2O-vapor partial pressure and was found to be acceptable with ΔCO2 ± 0.3 (μmol·mol-1 and ΔH2O ± 5 Pa. Whole-canopy carbon gas exchange and transpiration of four cropping `Braeburn'/M.26 apple trees followed closely incident radiation over the course of a day.

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19

KOSTEK, THEODORE M., and MATTHEW A. FRANCHEK. "HYBRID NOISE CONTROL IN DUCTS." Journal of Sound and Vibration 237, no. 1 (October 2000): 81–100. http://dx.doi.org/10.1006/jsvi.2000.3056.

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20

Campos, Rosely V., Rodrigo C. Ivo, and Eduardo B. Medeiros. "Developing active noise control systems for noise attenuation in ducts." Journal of the Acoustical Society of America 112, no. 5 (November 2002): 2428. http://dx.doi.org/10.1121/1.4779960.

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21

MORISHITA, Tatsuya, Masao TAKI, and Takuji MORI. "731 Active Control of Beat Noise in Ducts." Proceedings of the Dynamics & Design Conference 2006 (2006): _731–1_—_731–4_. http://dx.doi.org/10.1299/jsmedmc.2006._731-1_.

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22

Snyder, Scott D., and Colin H. Hansen. "Active noise control in ducts: Some physical insights." Journal of the Acoustical Society of America 86, no. 1 (July 1989): 184–94. http://dx.doi.org/10.1121/1.398762.

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23

Morris, K. A. "Noise Reduction in Ducts Achievable by Point Control." Journal of Dynamic Systems, Measurement, and Control 120, no. 2 (June 1, 1998): 216–23. http://dx.doi.org/10.1115/1.2802412.

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Noise control in a one-dimensional duct is analyzed. This problem is of practical interest and is also simple enough that a complete theoretical analysis is possible. It is shown that the optimal controller leads to an unstable closed loop. The noise reduction level achievable with a stable closed loop is calculated for arbitrary choices of sensor and actuator locations. This enables the best placement of sensors and actuators to be determined. Also, the analysis indicates that a “spatial waterbed” effect exists in some configurations of active noise control: i.e., that noise levels are increased for points outside of the region over which the design is done.

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24

Andersson, Anders O. "Active control of tone noise in engine ducts." Journal of the Acoustical Society of America 104, no. 3 (1998): 1153. http://dx.doi.org/10.1121/1.424293.

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25

Peng, Shimin. "An adaptive active noise control system in ducts." Journal of the Acoustical Society of America 107, no. 5 (May 2000): 2801. http://dx.doi.org/10.1121/1.429016.

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26

Yuan, Jing. "Improving robustness of active noise control in ducts." Journal of the Acoustical Society of America 114, no. 1 (July 2003): 210–17. http://dx.doi.org/10.1121/1.1579005.

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27

Yin, Chang Chun, Xue Guang Liu, Ye Wang, and Min Zhu. "Investigation on a Semi-Active Silencing Device for the Exhaust Noise." Advanced Materials Research 317-319 (August 2011): 2249–53. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.2249.

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This paper, according to the principle of the Hershcel-Quincke tube, presents a semi-active silencing device which can effectively control the fundamental frequency exhaust noise of the internal combustion engine. This device can choose the proper pipeline by using the valves to achieve semi-active control of low-frequency noise of the internal combustion engine. Taking the 4102BG-type diesel engine as the research object, we designed a bypass duct silencer to control its fundamental frequency exhaust noise, and then simulation and steady-state control performance testing also have been done. The results show that the bypass duct silencer can get 6~20dB reduction of the fundamental frequency exhaust noise in the steady-state operating conditions, and the total SPL has also decreased.

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28

Ng, Kam W., and Henry A. Leinhos. "Active noise control of time‐varying signals in ducts." Journal of the Acoustical Society of America 88, S1 (November 1990): S39. http://dx.doi.org/10.1121/1.2028987.

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29

Liu, S., J. Yuan, and K. Y. Fung. "Robust active control of broadband noise in finite ducts." Journal of the Acoustical Society of America 111, no. 6 (June 2002): 2727–34. http://dx.doi.org/10.1121/1.1476683.

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Okamoto, Yasushi, Hans Bodén, and Mats Åbom. "Active noise control in ducts via side‐branch resonators." Journal of the Acoustical Society of America 96, no. 3 (September 1994): 1533–38. http://dx.doi.org/10.1121/1.410231.

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31

Choy, Y. S., Yang Liu, and Kin Tak Lau. "Duct Noise Control by Using Very Light Composite Plate." Advanced Materials Research 410 (November 2011): 361–65. http://dx.doi.org/10.4028/www.scientific.net/amr.410.361.

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A compact flow-through plate silencer is constructed for low frequency noise control by using new reinforced composite plates. The concept comes from the previous theoretical study [1] that in a duct, a clamped supported plate covered with a rigid cavites. The structural property of the very light plate with high bending stiffness is very crucial element in such plate silencer. In this study, an approach to fabricate new reinforced composite panel with light weight and high bending stiffness is developed in order to realize the function of this plate silencer practically. The performance of two plate silencer with the stopband from 229 to 618Hz in which the transmission loss is higher than 10 dB over the whole frequency band can be achieved.

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32

ITAMOTO, Morimasa, and Hiroyoshi SHIOKAWA. "ON GENERATED NOISE BY AIR FLOW AT STRAIGHT GLASS FIBER DUCTS." Journal of Architecture, Planning and Environmental Engineering (Transactions of AIJ) 428 (1991): 21–27. http://dx.doi.org/10.3130/aijax.428.0_21.

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33

Di Bella, Antonino, and Roberto Zecchin. "Multi‐purpose apparatus for evaluation of noise transmitted through air ducts." Journal of the Acoustical Society of America 105, no. 2 (February 1999): 1372. http://dx.doi.org/10.1121/1.426492.

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34

Tang, Wing-Cheong. "Low Frequency Acoustic Performance in Ducts Using Honeycomb Layer Systems." Building Acoustics 15, no. 1 (January 2008): 21–34. http://dx.doi.org/10.1260/135101008784050188.

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The use of composite materials, like honeycomb structures, in the building industry is growing rapidly, due to their superior performance (very high Sound Transmission Loss) and significant weight reduction over conventional materials. An experimental investigation into low-frequency duct noise reduction using honeycomb sandwich panels is presented. Composite sandwich structures with an air gap between panels provide low-frequency sound absorption. The waves in the duct are coupled with those in the porous layer and the air cavities. The energy is dissipated as a result of the resonant mass-spring behavior of the system. A significant impact on the noise reduction is obtained by using a comparatively stiff honeycomb panel, in combination with a thin metallic duct wall with minimum weight. A noise reduction up to 12dB, below 300 Hz, is demonstrated.

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35

GUSEV, V. P., V. I. LEDENEV, A. I. ANTONOV, and I. V. MATVEEVA. "Calculations of Noise in air Ducts when Evaluating the Noise Effects of Industrial Enterprises on Urban Development." Zhilishchnoe Stroitel'stvo, no. 7 (2020): 3–7. http://dx.doi.org/10.31659/0044-4472-2020-7-3-7.

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36

MORISHITA, Tatsuya, Masao TAKI, and Takuji MORI. "318 Active Control of Beat Noise in Ducts (No.2)." Proceedings of the Dynamics & Design Conference 2007 (2007): _318–1_—_318–4_. http://dx.doi.org/10.1299/jsmedmc.2007._318-1_.

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37

Gardonio, P., and J. Rohlfing. "Modular feed-forward active noise control units for ventilation ducts." Journal of the Acoustical Society of America 136, no. 6 (December 2014): 3051–62. http://dx.doi.org/10.1121/1.4900571.

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38

Eriksson, L. J. "A brief social history of active noise control in ducts." Journal of the Acoustical Society of America 104, no. 3 (September 1998): 1807. http://dx.doi.org/10.1121/1.423598.

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39

KANG, Y. J., and I. H. JUNG. "SOUND PROPAGATION IN CIRCULAR DUCTS LINED WITH NOISE CONTROL FOAMS." Journal of Sound and Vibration 239, no. 2 (January 2001): 255–73. http://dx.doi.org/10.1006/jsvi.2000.3115.

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Yuan, J., and K. Y. Fung. "A TRAVELLING WAVE APPROACH TO ACTIVE NOISE CONTROL IN DUCTS." Journal of Sound and Vibration 219, no. 2 (January 1999): 307–21. http://dx.doi.org/10.1006/jsvi.1998.1885.

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Gaj, Patryk, and Joanna Kopania. "Influence of Geometry of Channel on the Flow Noise Parameters." Mechanics and Mechanical Engineering 22, no. 2 (August 24, 2020): 541–52. http://dx.doi.org/10.2478/mme-2018-0043.

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AbstractAcoustic emission through duct walls is an important problem in engineering acoustics. This phenomenon most commonly occurs in heating, ventilating and air-conditioning (HVAC) and other gas flow ducting (large industrial silencers). Many works focus on elaboration of more exact description of the acoustic field phenomena reflecting the real conditions in which these appliances operate. As a standard, circle or rectangular ducts are used in ventilation systems. However, technical conditions during the installation of the HVAC system, due to the limitation of the assembly space, require often the use of channels with other geometries. This paper presents aeroacoustical parameters of three most common cross-sectional shapes of air-moving ductwork. The rectangular, square with roundedcorners and circular ducts were studied. The “natural” duct attenuation, which is a consequence of duct shape or noise breakout and involves a diminution of the internally propagated sound power was observed. Natural duct attenuation can be a useful way of reducing sound power levels in long runs of duct.

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Landau, Ioan Dore, Raul Melendez, Luc Dugard, and Gabriel Buche. "Robust and Adaptive Feedback Noise Attenuation in Ducts." IEEE Transactions on Control Systems Technology 27, no. 2 (March 2019): 872–79. http://dx.doi.org/10.1109/tcst.2017.2779111.

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Hu, Jwu-Sheng. "Feedforward and Feedback Control Strategy for Active Noise Cancellation in Ducts." Journal of Dynamic Systems, Measurement, and Control 118, no. 2 (June 1, 1996): 372–78. http://dx.doi.org/10.1115/1.2802332.

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This paper presents the theoretical work about active noise cancellation in ducts. The proposed control system is designed based on the assumption of a one-dimensional sound field. The controller consists of a feedforward block which serves as a noise observer. The feedback portion of the control algorithm is to minimize residual disturbances. Closed-loop stability of the MIMO (multiple-input-multiple-output) system is analyzed and the result shows that the dynamic influenced by the space-feedforward and feedback controllers can be decoupled. Both semi-infinite and finite-length ducts are considered in this study and simulation examples are given to illustrate the effectiveness of the proposed controllers.

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JINBO, Naoki, and Yasuhide KOBAYASHI. "1018 Control Performance of Directional Sources in Active Noise Control for Ducts." Proceedings of Conference of Hokuriku-Shinetsu Branch 2008.45 (2008): 363–64. http://dx.doi.org/10.1299/jsmehs.2008.45.363.

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Zhuravlev, Evgeniy, Dmitry Chugunkov, and Galina Seyfelmlyukova. "Improving the acoustic efficiency of laminated dissipative noise silencers for boiler gas-air paths." E3S Web of Conferences 140 (2019): 02005. http://dx.doi.org/10.1051/e3sconf/201914002005.

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The operation of thermal power facilities is associated with the negative impact on the environment and humans of such factors as air, water, soil pollution, electromagnetic radiation, and noise. This article is devoted to improving the noise reduction efficiency of gas and air paths of boilers of thermal power plants. In world practice, to reduce noise in gas-air ducts, dissipative noise silencers are used. The authors propose a new design of sound attenuation elements for dissipative plate-type silencers. The article defines the acoustic and aerodynamic characteristics of noise silencers with new sound attenuation elements. We compare the characteristics of silencers made of new silencing elements and the characteristics of silencers consisting of plates of common design with flat surfaces of the side walls, and demonstrate an increase in acoustic efficiency and a decrease in pressure loss when using the proposed new silencing elements in noise silencers. Recommendations on the use of dissipative plate-type silencers with developed sound attenuation elements for gas-air paths of boilers are given.

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Cai, Chenzhi, and Cheuk Ming Mak. "Generalized flow-generated noise prediction method for multiple elements in air ducts." Applied Acoustics 135 (June 2018): 136–41. http://dx.doi.org/10.1016/j.apacoust.2018.02.008.

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Olson, D. A., S. S. Wise, L. J. Eriksson, and M. C. Allie. "Air‐moving devices and active noise control." Journal of the Acoustical Society of America 85, S1 (May 1989): S2. http://dx.doi.org/10.1121/1.2026902.

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Song, Wonjoon, Shrikant Pattnaik, Wancheng Zhao, Milind Bapat, and Hyunsoo Kim. "Analysis and control of air compressor noise." Journal of the Acoustical Society of America 118, no. 3 (September 2005): 1872. http://dx.doi.org/10.1121/1.4809091.

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Waddington, D. C., and D. J. Oldham. "Noise Generation in Ventilation Systems by the Interaction of Airflow with Duct Discontinuities: Part 1 Bends." Building Acoustics 14, no. 3 (September 2007): 179–202. http://dx.doi.org/10.1260/135101007781998956.

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Discontinuities in air duct systems give rise to turbulence and some of this turbulence results in airflow generated noise. One potential source of flow generated noise in ducts is the presence of a bend. Various strategies are employed to reduce turbulence by smoothing the flow around a bend, such as the use of turning vanes, large radius of curvature and the associated use of splitters, and these will also affect the noise generated. Recent work on the prediction of airflow generated noise in ducts based upon pressure loss characteristics is applied to a range of bends including mitred bends, with and without turning vanes, and radiussed bends, with and without splitters. The effect of bends with different aspect ratios is also examined. An excellent collapse of measured data onto a single characteristic curve is reported for each configuration based upon standard values of pressure loss coefficients. It is suggested that these characteristic curves might form the basis for a practical prediction method.

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Jwu-Sheng Hu. "Active noise cancellation in ducts using internal model-based control algorithms." IEEE Transactions on Control Systems Technology 4, no. 2 (March 1996): 163–70. http://dx.doi.org/10.1109/87.486342.

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