Relevant bibliographies by topics / Passive Noise Control

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Passive Noise Control'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 June 2025

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Journal articles on the topic "Passive Noise Control"

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Elhadidi, B., and H. M. Atassi. "Passive Control for Turbofan Tonal Noise." AIAA Journal 43, no. 11 (2005): 2279–92. http://dx.doi.org/10.2514/1.7159.

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Lai, Joseph C. S., Colin Speakman, and Hugh M. Williamson. "Control of Shear Cutting Noise: Effectiveness of Passive Control Measures." Noise & Vibration Worldwide 33, no. 7 (2002): 6–12. http://dx.doi.org/10.1260/09574560260370079.

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In an attempt to reduce noise from roll former shears three noise abatement enclosures of different designs and sheet dampers were assessed. Results indicate that only a noise reduction of 5dB can be achieved at the operator position by noise abatement enclosures, virtually independent of their designs and materials. This rather poor performance of enclosures is basically caused by structure-borne paths whereby vibrations are transmitted through the metal sheet product itself from the inside of the enclosure to the outside. Sheet dampers which have been designed to reduce the impact induced vibrations of the sheet product achieves a similar noise reduction as the enclosures but at about one quarter of the cost.
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Babu, Lenin, and Chandramouli Padmanabhan. "Hybrid Active and Passive Noise Control of Cavities." Acta Acustica united with Acustica 97, no. 5 (2011): 752–60. http://dx.doi.org/10.3813/aaa.918455.

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In this paper a hybrid active noise control of a cavity with poro-elastic material has been investigated. It has been found that the noise reduction achieved with active noise control in the cavity without poro-elastic material is not significantly altered with the presence of poro-elastic materials. This is shown to be independent of the porous material and its thickness and is true both at lower and mid-frequency ranges. Further, it is seen that macro perforations do not alter the sound absorption performance of the poro-elastic material in the presence of active noise control. The results clearly indicate that one can choose a smaller thickness of the porous material when active noise control is used in a cavity for noise suppression.
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Nakano, Toshihiro, Shigeru Matsuo, Toshiaki Setoguchi, and Kenji Kaneko. "A Study of Passive Control of Impulsive Noise." Proceedings of the Fluids engineering conference 2004 (2004): 139. http://dx.doi.org/10.1299/jsmefed.2004.139.

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Szulc, O., P. Doerffer, and F. Tejero. "Passive control of rotorcraft high-speed impulsive noise." Journal of Physics: Conference Series 760 (October 2016): 012031. http://dx.doi.org/10.1088/1742-6596/760/1/012031.

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Wong, Yee-Jun, Roshun Paurobally, and Jie Pan. "Hybrid active and passive control of fan noise." Applied Acoustics 64, no. 9 (2003): 885–901. http://dx.doi.org/10.1016/s0003-682x(03)00049-5.

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PAONESSA, A. "The passive and active noise control strategy in the aircraft interior noise." Le Journal de Physique IV 04, no. C5 (1994): C5–51—C5–53. http://dx.doi.org/10.1051/jp4:1994505.

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Liu, Feng. "Finite-Time Chaos Control of Lorenz Chaotic System Based on the Passive Control Teachnique." Applied Mechanics and Materials 397-400 (September 2013): 1345–50. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1345.

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Finite-time chaos control of Lorenz chaotic system applying the passive control method is investigated in this paper. Based on the finite-time stability theory and the passive control technique, the passive controller are proposed to realize finite-time chaos control of Lorenz chaotic system. The controller is robust to noise. Both theoretical and numerical simulations show the effectiveness of the proposed method.
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Nishikawa, Reon. "Passive control of the flow-induced noise from a rectangular cylinder using porous walls." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (2021): 4219–25. http://dx.doi.org/10.3397/in-2021-2635.

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A noise reducing technique for the flow-induced noise using a porous material was studied experimentally and numerically. In the experiment, flow-induced noises emitted from three types of rectangular cylinders were measured in a low-noise wind tunnel. One cylinder was made of four aluminum plates and others were made of two or three aluminum plates. Measurement results show that the frequency of the distinct tonal noise was different among three cylinders, that frequency was higher for using porous material. It was also found that the sound pressure lelvel of the noise was also different and that of the cylinder using two porous material plates was 25 dB smaller at maximum. Velocity field of the wake of cylinders were examined by the PIV measurement and that showed that time and space scale of separated vortices around cylinder were smaller for using two porous material plates. It is assumed that the change of aerodynamic sound was caused by that change in velocity field. In the numerical simulation, we could simulate changes of the emitted noise and the wake of the cylinder by applying the slip boundary condition of the velocity to the wall of the cylinder.
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Mirzaev, Akramjon, and Sanjar Zoteev. "Noise in Telecommunication: Different Types and Methods of dealing with Noise." Journal La Multiapp 1, no. 5 (2021): 25–27. http://dx.doi.org/10.37899/journallamultiapp.v1i5.275.

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This article discusses noise in telecommunications: different types and methods of dealing with noise. Noise is arguably a very hated problem because it can interfere with the quality of signal reception and also the reproduction of the signal that will be transmitted. Not only that, but noise can also limit the range of the system to a certain emission power and can affect the sensitivity and sensitivity of the reception signal. Even in some cases, noise can also result in a reduction in the bandwidth of a system. Of course, we've all felt how annoying the noise effect is. For example, when listening to the radio, a hissing sound appears on the loudspeaker due to noise. To overcome noise, it is divided into passive noise control and active noise control. Passive noise control is an effort to overcome noise using components that do not require power. Generally passive noise control uses soundproof materials that act as insulation against noise. The method most commonly used to overcome noise is through increasing the gain. The noise is generally in a specific sound area. Hiss is on high frequencies, while noise and hum are on low frequencies. This is the principle underlying the noise reduction method.
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Dissertations / Theses on the topic "Passive Noise Control"

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Mitchell, Morgan Adrienne. "Passive Noise Control in Incubators." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51603.

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Incubators in the Neonatal Intensive Care Unit (NICU) are known to produce high Sound Pressure Levels (SPL) that can have detrimental effects on infants. Currently measured SPL in NICU's using traditional incubators are above the recommended 45 dB[A] threshold value [1]. Due to operating equipment and environmental noise, the sound level that is perceived by the developing newborn can cause both short and long term hearing loss as well as psychological damage [1].This thesis presents a study on how passive noise control devices can be used to reduce SPL levels in incubator NICU environments. A combination of experimental testing coupled with Finite Element simulations were performed for a modern incubator. In the experimental portion, porous mattresses were analyzed to reduce SPL values. These same test scenarios were modeled using the FE software. Using this model, extensive studies were performed on an arrangement of porous mattress materials with simple foam shapes to determine sound absorbing characteristics of several designs. Data was collected and studied at a NICU at Children\'s Hospital in Norfolk, Va. Experimental work showed improvement in reducing SPL with multiple thicknesses for different sound absorbing mattresses. The experimental outcomes validated the FE simulation model by showing similar trends at the baby\'s ears. In simulation work, polyimide foam had the best low frequency performance while polyurethane had the greatest performance in middle and high frequencies. Designs that used full-width foam treatments across the incubator produced the overall greatest reduction in noise around the baby control volume by approximately 26%.<br>Master of Science
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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.<br>Ph. D.
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Verbsky, Babette L. "EFFECTS OF CONVENTIONAL PASSIVE EARMUFFS,UNIFORMLY ATTENUATING PASSIVE EARMUFFS, AND HEARING AIDS ON SPEECH INTELLIGIBILITY IN NOISE." Columbus, Ohio : Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1038964671.

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Thesis (Ph. D.)--Ohio State University, 2002.<br>Title from first page of PDF file. Document formatted into pages; contains xvi, 162 p. Includes abstract and vita. Advisor: Lawrence L. Feth, Dept. of Speech and Hearing Science. Includes bibliographical references (p. 141-148).
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Beyene, Samson. "Feasibility study of a hydrid passive/active noise absorption system." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-12052009-020351/.

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Goldstein, Andre L. "Control of Sound Transmission with Active-Passive Tiles." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27913.

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Nowadays, numerous applications of active sound transmission control require lightweight partitions with high transmission loss over a broad frequency range and simple control strategies. In this work an active-passive sound transmission control approach is investigated that potentially addresses these requirements. The approach involves the use of lightweight stiff panels, or tiles, attached to a radiating base structure through active-passive soft mounts and covering the structure surface. The resulting double-partition configuration was shown to have good high frequency passive isolation, but poor low frequency transmission loss due to the coupling of the tiles to the base vibration through the air gap. The low frequency transmission loss performance of the partition was increased by using the active mounts to cancel the local volume velocity of the tiles. The use of a decentralized control approach with independent single channel controllers for each tile facilitates the implementation of a multiple tile system in a large scale application. A coupled structural-acoustic model based on an impedance mobility matrix approach was formulated to investigate the potential performance of active-passive tile approach in controlling sound transmission through plates. The model was initially applied to investigate the sound transmission characteristics of a double-panel partition consisting of a single tile-plate configuration and then extended to model a partition consisting of multiple-tiles mounted on a plate. The system was shown to have significant passive performance above the mass-spring-mass resonance of the double-panel system. Both feedback and feedforward control approaches were simulated and shown to significantly increase the transmission loss of the partition by applying control forces in parallel with the mounts to reduce the tile normal velocity. A correspondent reduction in sound radiated power was obtained over a broad frequency range limited by the tile stiffness. The experimental implementation of the active-passive tile approach for the control of sound transmission through plates was also performed. Two main experimental setups were utilized in the investigations, the first consisting of a single tile mounted on a clamped plate and the other consisting of four active tiles mounted of a simply supported plate. Tile prototypes were implemented with lightweight stiff panels and integrated active-passive mounts were implemented with piezoelectric Thunder actuators. Both analog feedback and digital feedforward control schemes where designed and implemented with the objective of reducing the normal velocity of the tiles. Experimental results have demonstrated significant broad frequency range reductions in the sound transmission through the partition by active attenuation of the tile velocity. In addition, the experiments have shown that decentralized control can be successfully implemented for multiple tiles systems. The active-passive sound transmission control characteristics of the systems experimentally studied were observed to be in accordance with the analytical results.<br>Ph. D.
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Calton, Matthew Franklin. "Modeling of Acoustic Resonators and Resonator Systems for Use in Passive Noise Control." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/9261.

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Acoustic resonators, such as the Helmholtz and quarter-wave resonator, can be used to attenuate unwanted noise in an enclosed space. Classical formulations can be used to approximate resonator performance for a given resonator configuration, but may lack sufficient accuracy for some applications. This research aims to improve the analytical characterization of resonators to provide better correlation to experimental results. Using higher-order approximations and proper end corrections, more accuracy can be obtained in calculating the impedance and resonance frequency of a single resonator, which will then carry over into the overall configuration of the model. The impedance of a system of resonators in parallel is also considered, where the effects of acoustic coupling can be observed. Resonators with complex, non-ideal geometries are explored for applications where space is limited. The effects of tapers and toroidal curves are considered using impedance translation methods. These theoretical predictions are found to compare favorably with empirical data. Coupling between an enclosure and resonator system is explored experimentally. The effects of resonator placement, damping, and relative cavity and enclosure volume are considered. These data are used to design and test a resonator system with 10 dB of attenuation over a bandwidth of 10 Hz.
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Gentry-Grace, Cassandra Ann. "A Study of Smart Foam for Noise Control Applications." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/40091.

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Smart foam is a composite noise control treatment that consists of a distributed piezoelectric actuator, known as polyvinylidene fluoride (PVDF), embedded within a layer of partially-reticulated polyurethane foam. The principal function of smart foam is to yield broadband sound attenuation. Passive acoustic foams are a very reliable high-frequency sound reduction method. With regard to smart foam, the embedded piezoelectric actuator is introduced to overcome the limitations of the passive foam in the low-frequency region. The piezoelectric actuator excites the structural and acoustic phases of the foam when driven by an externally supplied control voltage. This generates a secondary acoustic field which destructively interacts with the acoustic field created by a primary noise source. Initial experiments employ the composite "active/passive" treatment to yield attenuation of piston sound radiation. For this simple source, the global farfield pressure is minimized according to the feedforward, Filtered-x LMS control algorithm using one error sensor. Significant broadband sound attenuation is obtained. A more advanced noise control problem is investigated which minimizes plate radiation. The vibrating plate has a distributed modal response requiring a collective array of independently-phased smart foam actuators to yield reduction of the radiated sound power. This is accomplished by minimizing the sound pressure at an array of nearfield microphones. Good broadband sound power reduction is obtained using a MIMO (multiple-input/multiple-output) Filtered-x LMS control scheme. Various techniques for improving smart foam's acoustic control authority are identified during manufacturing and finite element modeling. of the actuator. These improved smart foam actuators are employed as an active/passive liner to suppress the transverse propagating acoustic modes within an anechoically-terminated rectangular duct. A section of a duct wall is lined with an array of smart foam and the sound downstream of the control actuators is minimized at several error microphones. Successful harmonic and broadband noise control is achieved. A full-scale numerical model of the duct acoustic control application is presented based on the finite element method. The purpose of the model is to study the sensitivity of this active/passive control approach relative to the spatial distribution of control channels and error sensors. A comparison of the numerical and experimental results yields similar trends.<br>Ph. D.
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Griffin, Jason Robert. "The Control of Interior Cabin Noise Due to a Turbulent Boundary Layer Noise Excitation Using Smart Foam Elements." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/32804.

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In this work, the potential for a smart foam actuator in controlling interior cabin noise due to a turbulent boundary layer excitation has been experimentally demonstrated. A smart foam actuator is a device comprised of sound absorbing foam with an embedded distributed piezoelectric layer (PVDF) designed to operate over a broad range of frequencies. The acoustic foam acts as a passive absorber and targets the high frequency content, while the PVDF serves as the active component and is used to overcome the limitations of the acoustic foam at low frequencies. The fuselage skin of an aircraft was represented by an experimental test panel in an anechoic box mounted to the side of a wind tunnel. The rig was used to simulate turbulent boundary layer noise transmission into and aircraft cabin. An active noise control (ANC) methodology was employed by covering the test panel with the smart foam actuators and driving them to generate a secondary sound field. This secondary sound field, when superimposed with the panel radiation, resulted in a reduction in overall sound in the anechoic box. An adaptive feedforward filtered-x Least-Mean-Squared (LMS) control algorithm was used to drive the smart foam actuators to reduce the sound pressure levels at an array of microphones. Accelerometers measured the response of the test panel and were used as the reference signal for the feedforward algorithm. A detailed summary of the smart foam actuator control performance is presented for two separate low speed wind tunnel facilities with speeds of Mach 0.1 and Mach 0.2 and a single high speed tunnel facility operating at Mach 0.8 and Mach 2.5.<br>Master of Science
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Sacarcelik, Ozer. "Acoustic Devices for the Active & Passive Control of Sound in a Payload Compartment." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9950.

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The work presented in this thesis can be divided into two main subjects. First, lightweight designs for acoustic devices such as Helmholtz resonators and loudspeakers used for noise control in rocket payload compartments are developed. Second, active control using a hybrid control system (with structural and acoustic actuators) was tested experimentally. Due to the weight limitations for this application, Helmholtz resonators and loudspeakers are re-designed in order to reduce the device weight as much as possible while maintaining performance. For Helmholtz resonators, this is done by modeling the resonator for different structural shapes, wall materials and wall thicknesses using a finite element analysis software. The final design is then compared to the rigid resonators and is shown to perform effectively. These designs are then successfully applied to the full-scale fairing at Boeing facilities. In order to design a lightweight loudspeaker, a comparative approach was used. A standard 12' loudspeaker is taken as the reference loudspeaker and weight reduction solutions are applied to it while maintaining performance. The loudspeaker is characterized using mechanical, electrical and acoustical theories, and an optimization process is applied in order to minimize a defined cost function, which was taken as the total sound pressure output over a targeted frequency range per mass of the actuator. The results are used to build a lightweight loudspeaker together with a lightweight box, and the new designs are tested for comparison with the reference loudspeaker and shown to increase performance by 1.7 dB over 60-200 Hz band while reducing the mass by 78%. The second part of this thesis investigates the performance of a hybrid active control treatment featuring distributed vibration absorbers (DAVAs) and loudspeakers applied on a scale payload fairing. Several aspects such as causality, reference signals, and maximum controllable levels of this feedforward control scheme are the subjects of analyses. The results show that this active control approach can achieve significant amount of interior noise attenuation, and the total actuator weight required to control an external level of 138 dB can be reduced to 9.2kg using lightweight loudspeakers. However, it is shown that the attenuation levels can still be improved further by actuator positioning that gives more effective coupling of the actuators with the structural and acoustic modes and by using multiple references for the control system.<br>Master of Science
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Marek, Kenneth A. "The modeling and use of syntactic foams for passive control of fluid-borne noise." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53122.

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Syntactic foams-composite materials consisting of hollow particles embedded in a host matrix-have many applications for manufactured products, including weight reduction, thermal insulation, and noise reduction. In this thesis, a certain variety of syntactic foam is investigated with regards to reducing fluid borne noise in hydraulic systems. Such a foam maintains stiffness at low hydrostatic pressures and becomes compressible as pressure increases. With this compressibility, the foam is potentially useful as a liner for a reactive noise control device, much like compressed gas style devices currently in use; but the syntactic foam additionally adds significant damping to the system. In order to predict device performance, a linear multimodal model is developed of a hydraulic suppressor, constructed as an expansion chamber lined with a syntactic foam insert. Material models are developed for various compositions of the foam liners, based on an inverse analysis matching the model to experimental results. Two model simplifications are considered, and it is found that a simplified bulk modulus model gives sufficiently accurate results to make approximate predictions of suppressor performance. Several optimizations are performed to predict the optimal material composition for hydraulic excavator work cycles. To help compare the prototype suppressor against commercially available bladder style suppressors, a model is developed for the bladder style silencer and is validated experimentally. Overall, this work both demonstrates the current and potential utility of syntactic foam as a device lining material, and contributes new models to the hydraulics noise control community.
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Books on the topic "Passive Noise Control"

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J, Remington Paul, BBN Technologies, United States. Federal Railroad Administration. Office of Research and Development., and John A. Volpe National Transportation Systems Center (U.S.), eds. A hybrid active/passive exhaust noise control system (APECS) for locomotives. Federal Railroad Administration, Office of Research and Development, 2002.

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Brown, Terry, Sebastian Oberst, Benjamin Halkon, and Jinchen Ji. Vibration Engineering for a Sustainable Future: Active and Passive Noise and Vibration Control, Vol. 1. Springer, 2020.

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Datta, Debasish. Optical Networks. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198834229.001.0001.

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This book presents an in-depth deliberation on optical networks in four parts, capturing the past, present, and ensuing developments in the field. Part I has two chapters presenting an overview of optical networks and the enabling technologies. Part II has three chapters dealing with the single-wavelength optical networks: optical LANs/MANs, optical access networks using passive optical network architecture, SONET/SDH, optical transport network and resilient packet ring. Part III consists of four chapters on WDM-based optical networks, including WDM-based local/metropolitan networks (LANs/MANs) using single and multihop architectures over passive-star couplers, WDM/TWDM access networks as an extension of PONs with WDM transmission, WDM metro ring networks covering circuit-switched (using point-to-point WDM and wavelength-routed transmission) plus packet-switched architectures and WDM long-haul backbone networks presenting the offline and online design methodologies using wavelength-routed transmission. Part IV deals with some selected topics in six chapters. The first deals with transmission impairments and power-consumption issues in optical networks, while the next three chapters deal with the survivable optical networks, network control and management techniques, including GMPLS, ASON, and SDN/SDON, and datacenter networks using electrical, optical, and hybrid switching techniques. The final two chapters present elastic optical networks using flexible grid for better utilization of the optical-fiber spectrum and optical packet and burst-switched networks. The three appendices present the basics of the linear programming techniques, noise processes encountered in the optical communication systems, and the fundamentals of queuing theory and its applications in telecommunication networks. (238 words)
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Llano, Samuel. Flamenco, Flamenquismo, and Social Control. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199392469.003.0004.

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This chapter describes how, toward the end of the nineteenth century, journalists and social scientists concerned about social degeneration and the moral effects of Madrid’s nightlife gradually turned their attention away from the Gypsy and the señorito, that is, the rich Andalusian immigrant who organized flamenco juergas or gatherings in Madrid. Instead, these writers focused on the environment in which flamenco was performed. They used their publications to present Madrid as a den of vice and degeneration and to call the authorities to take measures to prevent the rise of scandals and crime in Madrid’s drinking establishments. Madrid’s authorities responded by passing legislation aimed at restricting the operating times of cafés and protecting the peace of residents from the “noise” of taverns. The lobbying by representatives of the powerful alcohol industry, however, rendered those measures fruitless in the long term.
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Book chapters on the topic "Passive Noise Control"

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Rahn, Christopher D. "Passive Control." In Mechatronic Control of Distributed Noise and Vibration. Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04641-8_4.

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Fuchs, Helmut V. "Passive Absorbers." In Applied Acoustics: Concepts, Absorbers, and Silencers for Acoustical Comfort and Noise Control. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-29367-2_4.

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Fiorio, Luca, Francesco Romano, Alberto Parmiggiani, Bastien Berret, Giorgio Metta, and Francesco Nori. "Design and Control of a Passive Noise Rejecting Variable Stiffness Actuator." In Springer Tracts in Advanced Robotics. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93870-7_11.

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de Lima, Vinícius Dias, José Maria Campos dos Santos, and José Roberto F. Arruda. "Passive Control of Noise Propagation in Tube Systems Using Bragg Scattering." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91217-2_37.

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Shi, Z., J. Lin, and H. Lai. "Study of Passive Control of Jet Noise by Blind Holes on Nozzle Inner Wall." In Fluid-Structure-Sound Interactions and Control. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7542-1_52.

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Sahoo, Sudarsan, and Smruti Ranjan Jagadeb. "Hybrid Active and Passive Control of a Server Room Noise: A Comparative Study of Results Obtained by Using Different Algorithms." In Advances in Intelligent Systems and Computing. Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2220-0_48.

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Wang, Wei-Hui, Rong-Juin Shyu, and Jiang-Ren Chang. "Viscoelastic passive damping technology on ship's vibration and noise control." In Developments in Marine Technology. Elsevier, 1998. http://dx.doi.org/10.1016/s0928-2009(98)80241-2.

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"A Survey of Applications in Structural–Acoustic Optimization for Passive Noise Control with a Focus on Optimal Shell Contour." In Advances in Dynamics and Control. CRC Press, 2004. http://dx.doi.org/10.1201/9780203298916-17.

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Marburg, Steffen. "A Survey Of Applications In Structural – Acoustic Optimization For Passive Noise Control With A Focus On Optimal Shell Contour." In Advances in Dynamics and Control. CRC Press, 2004. http://dx.doi.org/10.1201/9780203298916.ch14.

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Chow, Chi-Wai. "Broadband Optical Access using Centralized Carrier Distribution." In Wireless Technologies. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-61350-101-6.ch802.

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Passive optical network (PON) is considered as an attractive fiber-to-the-home (FTTH) technology. Wavelength division multiplexed (WDM) PON improves the utilization of fiber bandwidth through the use of wavelength domain. A cost-effective solution in WDM PON would use the same components in each optical networking unit (ONU), which should thus be independent of the wavelength assigned by the network. Optical carriers are distributed from the head-end office to different ONUs to produce the upstream signals. Various solutions of colorless ONUs will be discussed. Although the carrier distributed WDM PONs have many attractive features, a key issue that needs to be addressed is how best to control the impairments that arise from optical beat noise induced by Rayleigh backscattering (RB). Different RB components will be analyzed and RB mitigation schemes will be presented. Finally, some novel PONs including signal remodulation PONs, long reach PONs and wireless/wired PONs will be highlighted.
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Conference papers on the topic "Passive Noise Control"

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Allaei, Daryoush, Yin-Tsan Shih, and David J. Tarnowski. "A Comparison Between Passive Vibration Control by Confinement and Current Passive Techniques." In SAE Noise and Vibration Conference and Exposition. SAE International, 1997. http://dx.doi.org/10.4271/971946.

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Logue, Michaela, and Hafiz Atassi. "Passive Control of Fan Broadband Noise." In 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-3149.

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Kruntcheva, Mariana R. "Passive Noise Reduction in an Automotive Compartment." In ASME 2008 Noise Control and Acoustics Division Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ncad2008-73073.

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Fuel economy, international competition and socioeconomic factors have forced manufacturers to develop lighter automotive vehicles. However, such vehicles are typically more susceptible to noise and vibration problems. The internal sound field in the passenger compartment is affected significantly by the acoustic modal characteristics of the cavity, by the dynamic behaviour of the surrounding structure, and by the nature of the coupling of these two dynamic systems. The purpose of this research is to develop and analyse a new vibroacoustic model containing the main compartment cavity and the luggage compartment cavity. Special attention is placed on the effect of a double walled partition between the main compartment cavity and the luggage compartment. The system is studied using ANSYS finite element (FE) code. The modelling involved shell finite elements for the structure and three-dimensional (3D) acoustic elements for the cavities. The 3D FE modal analysis produced results visualizing the complex picture of acoustic-structure coupling in the lower frequency range (30–200 Hz). It was found that strong coupling between the thin walled structure and the acoustic enclosures exists in the vicinity of any acoustic resonance. The key noise reduction principle examined is the passive application of a characteristic impedance mismatch. Using an FE model, numerical simulations are conducted to study the effect of various design parameters on acoustic transmission. The results show that at least 8 dB reductions in sound pressure level may be achieved with a modest level of vacuum in the double partition between the main cabin and the luggage compartment cavity.
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Zhang, Man, and Kader Frendi. "Bioinspired Passive Control of Airfoil Radiated Noise." In 22nd AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-2835.

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Nishikawa, Reon, Osamu Terashima, and Ayumu Inasawa. "On the Passive Noise Control of the Flow-Induced Noise Using Porous Materials." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24483.

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Abstract A passive noise control technique for the flow-induced noise using a porous material was studied experimentally. The purpose of this study was to decrease the aerodynamic sound using porous material that permeated only sound and clarify that reduction mechanism. In the experiment, flow-induced noises emitted from two types of rectangular cylinders was measured in a low-noise wind tunnel. One cylinder was made of four aluminum plates and the other was two aluminum and porous material plates each. Measurement results show that the frequency of the distinct tonal noise was different between two cylinders, that frequency was higher for using porous material. It was also found that the sound pressure level of the noise was also different and that of the cylinder using porous material plate was 25 dB smaller at maximum. Velocity field of the wake of cylinders were examined by the PIV measurement and that showed that time and space scale of separated vortices around cylinder were smaller for using porous material. It is assumed that the change of aerodynamic sound was caused by that change in velocity field.
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Imbaud, J., G. Douchet, and F. Sthal. "Passive noise analyses on langatate crystal resonators." In 2010 IEEE International Frequency Control Symposium (FCS). IEEE, 2010. http://dx.doi.org/10.1109/freq.2010.5556297.

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Zhang, Lijun, Shijuan Zhang, Dejian Meng, and Jie Xu. "Active and Passive Control of Torsional Vibration in Vehicle Hybrid Powertrain System." In Noise and Vibration Conference & Exhibition. SAE International, 2019. http://dx.doi.org/10.4271/2019-01-1460.

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Priddin, Matthew, David I. Baker, Lorna J. Ayton, and Nigel Peake. "Vortex Sound Models: Passive and Active Noise Control." In 2018 AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-3298.

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Elhadidi, Basman, and Hafiz Atassi. "Passive Noise Control by Blade Lean and Sweep." In 10th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-2999.

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Sagers, Jason, Jonathan D. Blotter, and Timothy W. Leishman. "Active Sound Transmission Control of an Experimental Double-Panel Partition Using Decoupled Analog Feedback Control." In ASME 2008 Noise Control and Acoustics Division Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ncad2008-73018.

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This paper addresses the construction, measurement, and analysis of a double-panel active partition (DPAP) and its accompanying analog feedback controllers. The DPAP was constructed by attaching an aluminum cone loudspeaker at each end of a short segment of a circular duct. Two analog feedback controllers were designed and built using the measured frequency response function of each panel. Two independent (decoupled) feedback controllers were then used to minimize the vibration amplitude of each panel in the presence of an acoustic disturbance. A normal-incidence transmission loss measurement system was used to assess the performance of the DPAP and of a single panel passive partition. Error signal attenuations show that it is both feasible and effective to simultaneously control both panels with decoupled feedback controllers, and that simultaneously controlling both panels of the DPAP has a distinct advantage over controlling a single panel. The reduction in vibration amplitude across the surface of the transmitting panel was confirmed with scanning laser vibrometer measurements. Transmission loss results were obtained for two passive and three active configurations. The average normal incidence transmission loss over the active measurement bandwidth (50–1,000 Hz) for the active double-panel was 60 dB. This is an average of 39 dB more transmission loss than a passive single panel partition.
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Reports on the topic "Passive Noise Control"

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Howard, Carl Q., and Colin Hansen. Investigation of Passive Control Devices for Potential Application to a Launch Vehicle Structure to Reduce the Interior Noise Levels During Launch. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada473434.

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