Relevant bibliographies by topics / Absorptive muffler

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Absorptive muffler'

Author: Grafiati
Published: 28 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Absorptive muffler"

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Chatterjee, Sushovan. "Computational fluid dynamic analysis of the exhaust gas flow through absorptive and reactive mufflers: some case studies." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 231, no. 11 (2016): 1568–88. http://dx.doi.org/10.1177/0954407016676230.

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This paper aims to study comprehensively the flow characteristics of exhaust gases through different types of muffler (e.g. absorptive, reactive and resonating). Geometric models were designed using PRO-E and analysed using ANSYS FLUENT 14. The contours for the pressure, the velocity and the turbulence were plotted for optimization of the muffler design based on the known thermodynamic parameters. On the basis of the variation in these parameters, various hybrid designs were proposed for a muffler and even for a combination of mufflers.
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Munjal, M. L., and U. S. Shirahatti. "Analysis of Lined Ducts With Mean Flow, With Application to Dissipative Mufflers." Journal of Vibration and Acoustics 109, no. 4 (1987): 366–71. http://dx.doi.org/10.1115/1.3269455.

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Mufflers with at least one acoustically absorptive duct are generally called dissipative mufflers. Generally, for want of systems approach, these mufflers are characterized by transmission loss of the lined duct with overriding corrections for the terminations, mean flow, etc. In this article, it is proposed that dissipative duct should be integrated with other muffler elements, source impedance and radiation impedance, by means of transfer matrix approach. Towards this end, the transfer matrix for rectangular duct with mean flow has been derived here, for the least attenuated mode. Mean flow introduces a coupling between transverse wave numbers and axial wave number, the evaluation of which therefore calls for simultaneous solution of two or three transcendental equations. This is done by means of a Newton-Raphson iteration scheme, which is illustrated here for square ducts lined with porous ceramic tiles.
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Patne, Mayur Manohar, S. Senthilkumar, and M. Jerome Stanley. "Numerical Analysis on Improving Transmission Loss of Reactive Muffler using Various Sound Absorptive Materials." IOP Conference Series: Materials Science and Engineering 993 (December 31, 2020): 012150. http://dx.doi.org/10.1088/1757-899x/993/1/012150.

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Wang, Ying Wu, Xiao Qing Zuo, and Xian Ning Chen. "Preparation and Sound Absorption Property of Al-Si12 Alloy Foam Core Muffler." Advanced Materials Research 183-185 (January 2011): 1687–91. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.1687.

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Al-Si12 alloy foams were fabricated by filtration method, and the Al-Si12 alloy foam core mufflers were made by using the fabricated Al-Si12 alloy foams. The preparation and sound absorption property of Al-Si12 alloy foam core muffler has been studied. The results show that sound absorption property of Al-Si12 alloy foam core muffler increases with the decreasing of pore diameter and the widening of the pore diameter range of Al-Si12 alloy foam core. Being superior to conventional sound-absorbing materials core mufflers, Al-Si12 alloy foam core muffler especially fits in noise control in hot, wet, and open-air environments.
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Fu, Jun, Jianxing Li, Wei Chen, Zengfeng Zhang, Hong Mao, and Yuan Tang. "Performance study of the exhaust purification muffler of a diesel engine." Multidiscipline Modeling in Materials and Structures 12, no. 4 (2016): 635–47. http://dx.doi.org/10.1108/mmms-04-2016-0017.

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Purpose The purpose of this paper is to present experimental studies on the designed muffler which contains ceramic foam and has the integration function of purification and noise elimination. Design/methodology/approach Comparative tests were done on a diesel engine with no muffler, the original muffler and the purification muffler. The soot index (light absorption coefficient), A-weighted sound pressure level and fuel consumption rate, which were collected by the partial flow opacity method, the insertion loss measurement of spatial five points and the load characteristics tests, respectively, and the effects of purification and noise elimination were studied. Findings The results of this paper state that the purification muffler shows great improvement on exhaust soot purification and noise elimination. The variation in diesel fuel consumption rate was small, the sound pressure level of purification muffler was reduced by 6 to 10 dB, the insertion loss of the purification muffler was increased by 6.41 dB and the average light absorption coefficient decreased by 57.8 percent compared with the original muffler. Originality/value The value of this study is that it supplies a purification muffler which contains a ceramic foam. Under the prerequisite of little effect on the fuel economy of diesel engine, the purification muffler shows great improvement in exhaust soot purification and noise elimination.
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Shan, Chang Ji, Lin Li, and Jun Luo. "A Liquid Analysis of the Rectangular Wave Input Signals of Hydraulic Mufflers." Applied Mechanics and Materials 312 (February 2013): 172–76. http://dx.doi.org/10.4028/www.scientific.net/amm.312.172.

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This paper makes use of the method of computational fluid dynamics (CFD) to group the Hydraulic muffler of network grid and makes a fluidic analysis of the rectangular wave input signal of the hydraulic muffler without intubation noise absorption effect. The result manifests that the employment of CFD simulation technology to hydraulic muffler can provide evident theoretical support for further development and study of hydraulic muffler, and is possible to lay a foundation for continuous studies of the hydraulic muffler.
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Chichvarina, Kristina, and Sergey Smirnov. "Study of the combined muffler effectiveness." MATEC Web of Conferences 320 (2020): 00023. http://dx.doi.org/10.1051/matecconf/202032000023.

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The paper presents the research of the spectral characteristics of a combined reflection and absorption muffler with a different ratio of dissipative elements and reactive components for a given muffler volume.
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PAN, K. L., C. I. CHU, and T. W. WU. "A DIRECT MIXED-BODY BOUNDARY ELEMENT METHOD FOR MUFFLERS WITH INTERNAL THIN COMPONENTS COVERED BY LINING AND A PERFORATED PANEL." Journal of Computational Acoustics 15, no. 01 (2007): 145–57. http://dx.doi.org/10.1142/s0218396x07003251.

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Thin components, such as baffles, extended inlet/outlet tubes, and internal connecting tubes, are commonly used in reactive mufflers for cancelation of sound at particular frequency peaks. To provide additional absorption effects at higher frequencies, porous sound absorbing materials may be used on the muffler interior wall surface or on any internal thin components. If the sound absorbing material is backed by a rigid surface, it is usually modeled by the local normal impedance approach. The local impedance modeling on the interior wall surface is straightforward and has been extensively used in the boundary element method, in which the boundary surface is just moved forward to the contact surface between the lining and air. On the other hand, the local impedance modeling on any internal thin components is relatively rare. This paper first presents a direct mixed-body boundary element formulation for a thin body covered by local impedance on either side or both sides of the thin body. The local impedance can be from the lining material itself, or from the lining material plus a protective perforated metal cover. Several test cases with experimental comparison are presented in this paper.
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Wang, Fang, Tianning Chen, Xiaopeng Wang, Kai Bao, and Lele Wan. "A membrane-type acoustic metamaterial muffler." International Journal of Modern Physics B 31, no. 08 (2017): 1750049. http://dx.doi.org/10.1142/s0217979217500497.

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Membrane-type acoustic metamaterials (MAMs) with negative dynamic mass have demonstrated the effects in the sound transmission loss (STL) at low-frequency range. This research aims to design a membrane-type acoustic metamaterial muffler (MAMM) based on the present MAMs, and to solve the problem that airflow cannot flow unimpededly in the channel once using the MAMs. For a better understanding of MAMM, the resonance frequency of the membrane was calculated and simulation was used to study the acoustic transmission performance of the MAMM. The simulation results were verified in comparison with the theoretical results of the membrane. This MAMM reduced the structural size of muffler compared with the traditional Helmholtz muffler and expand muffler, which can find application for the MAMs in acoustic absorption and noise control.
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Tarnow, Viggo, and Christian Pommer. "Attenuation of sound mufflers with absorption and lateral resonances." Journal of the Acoustical Society of America 83, no. 6 (1988): 2240–45. http://dx.doi.org/10.1121/1.396353.

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Dissertations / Theses on the topic "Absorptive muffler"

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Sesler, Josh J. "Implementation of Refractory Foam Technology for Silencing Small IC Engines." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/35453.

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With the need for stealth in defense applications steadily increasing, noise reduction continues to play an important role in the world of aeronautics. With the ever increasing number of small UAV flight vehicle designs and their stringent weight requirements, acoustic solutions become progressively more complex. This thesis investigates the use of refractory foam, a new class of porous material, for designing effective silencers for small IC engines. The solution must be lightweight, compact, conformable, and capable of handling the rigors of flight. Throughout the course of this research, many silencer designs were fabricated to take advantage of refractory foam technology. These silencer designs were then tested against existing designs using both anechoic and outdoor testing techniques. These results proved refractory foam to be a superior broadband noise absorber that can survive harsh flight environment. Silencer designs using this material showed overall improvements in the areas of noise reduction, weight, size, and backpressure, compared to commercial designs. The final silencer design boasted an Aweighted overall sound pressure level that was 12.1 dBA lower than the reference case. This result was accomplished using nearly half the volume required by other designs to attain similar results.<br>Master of Science
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Fučík, Ondřej. "Návrh opatření pro snížení hluku Rootsova dmychadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443883.

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The Master‘s thesis deals with issues of noise and vibrations of Roots blowers. In the theoretical part, potential sources of noise and vibrations are described. Detailed knowledge of basic types of mufflers is summarized, and their suitability for the corresponding application is evaluated. The practical part is focused on performing experimental measurements of the Roots blower’s noise and vibrations and the main sources of noise are determined. Subsequently, the existing anti-noise measures are analyzed and the proposal for adjusting the current measures for further noise reduction is presented.
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Binois, Remy. "Etude de l'efficacité des silencieux à baffles parallèles et conception de solutions optimisées en basses fréquences." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066523.

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Les silencieux à baffles parallèles sont largement utilisés dans les systèmes de chauffage, ventilation et climatisation (CVC) pour réduire le bruit généré par les sources aérauliques. Ces silencieux sont composés d'un certain nombre de baffles insérés dans un conduit de section rectangulaire. Chaque baffle est constitué d'un cadre métallique garni d'un matériau absorbant. Ce travail de thèse vise à analyser l'efficacité acoustique de ces silencieux afin d'en améliorer les performances en basses fréquences. Dans un premier temps, un modèle de propagation bidimensionnel à ``couches'' est développé afin de prédire les pertes par transmission pour une large variété de ce type de silencieux. Ce modèle multimodal repose principalement sur le calcul des modes acoustiques pour la pression moyenne dans chaque couche et a pour avantage de simplifier grandement la procédure de raccordement modal à l'interface entre deux domaines successifs. C'est un modèle facilement implémentable et approprié à des procédures d'optimisation de par sa rapidité et sa facilité de mise en données. Il a été validé expérimentalement lors de deux campagnes de mesure à des échelles réduite et réelle. Dans un second temps, le modèle développé est utilisé pour appréhender différentes pistes d'amélioration en basses fréquences et concevoir des solutions optimisées. Des premières pistes sont examinées dans le cas de silencieux standards concernant l'influence du nombre de baffles, de la symétrie et de la périodicité du silencieux sur le couplage modal et les performances acoustiques. Les autres pistes d'amélioration ainsi que les solutions optimisées ne figurent pas dans cette version pour des raisons de confidentialité<br>Baffle-type silencers are widely used in the heating, ventilation and air conditioning (HVAC) systems of buildings to reduce noise being emitted from air-moving devices such as fans and air conditioners. These silencers generally consist of several baffles inserted in a duct with a rectangular cross section. Each baffle is made of sound absorbing material such as rockwool or glasswool. Usually, a metallic fairing is also placed at each end of the baffle. This thesis aims to analyze the effectiveness of these acoustic silencers to improve performance at low frequencies. First, a two-dimensional multimodal model is developed to predict the transmission loss for a wide variety of this type of silencer. The numerical model relies mainly on the computation of approximate acoustic modes for the mean pressure in each layer corresponding either to the airway or the baffle. The method offers the advantage that it greatly simplifies the mode matching procedure at the junction between successive domains and it can be used to tackle relatively complex geometrical configurations with the possibility of taking into account the presence of resistive screens between the porous baffle and the air domain. It is also an easy-to-implement and relatively inexpensive model suitable for optimization purposes. It has been experimentally validated in two measurement campaigns at reduced and actual scales. In a second step, the developed model is used to investigate different ways of improving performance at low frequencies. Suggested improvements are discussed in the case of standard silencers regarding the influence of the number of baffles, symmetry and periodicity of the silencer on the modal coupling and acoustic performance. For confidentiality reasons, other suggested improvements and optimized solutions are not included in this version
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Smrček, Martin. "Hluk a vibrace rootsových dmychadel." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231776.

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This thesis is concerned with the spread of noise in the housing sets blowers, blower vibration, due to the shape of the geometry of the individual parts of the blower and the design of a suitable discharge muffler in order to achieve the highest possible attenuation. Analysis blower and silencer discharge was conducted using the finite element simulation ANSYS 15.0
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Wu, Li-Wei, and 吳立偉. "Optimization of Noise Cancellation Mufflers and Optimal Placement of Absorption Materials." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/22099242565201400593.

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碩士<br>大同大學<br>機械工程學系(所)<br>97<br>The thesis combines Neural Network System and Genetic Algorithm with acoustic analysis software SYSNOISE and which uses Boundary Element Method (BEM) to perform the muffler optimum design. The thesis is composed of three parts: (1) The performance of noise cancellation muffler: the tube of muffler is separated into two or more, and converge on one tube to reducing noise. Discussing the influence of variation of dimensions on the performance of noise cancellation muffler; (2) Combining Neural Network System and Genetic Algorithm with acoustic analysis software SYSNOISE to the optimum design of dimension of noise cancellation muffler: using Neural Network System to build network system and combining Genetic Algorithm to search the optimum of dimension and transmission loss(TL) of the muffer; (3) Combining Genetic Algorithm with acoustic analysis software SYSNOISE to the optimum design of noise cancellation muffler: using Genetic Algorithm to layout the distribution of absorptive materials to optimized the performance of the muffle. For the industrial applications, it can save time of design, decrease the production cost, and promote the production competition.
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Tu, Chien-Chung, and 杜建宗. "Various Configurations of Mufflers and the Optimal Layout of Absorption Material." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/97908170280473902881.

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碩士<br>大同大學<br>機械工程學系(所)<br>94<br>This study combines the genetic algorithm (GA) and the acoustic analysis software SYSNOISE and uses boundary element method (BEM) to perform the muffler optimum design. The study is composed of 3 parts: (1) the acoustic performance of muffler with four-lobed cross section: using the petaline curved surface to reduce noise and discuss the acoustic performance regarding to the number of petals and the location of absorbent pipe; (2) the acoustic performance of indentation muffler: using special designed indentation to reduce noise and discuss the correlation between indentation angle and the noise level; (3) optimal design combined with SYSNOISE analysis software and genetic algorithm: using GA to layout the distribution of absorptive materials in order to optimized the muffle performance. The results show that using genetic algorithm searches the location of absorptive materials combining with the four-lobed and indentation mufflers can improve the transmission loss effectively.
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Conference papers on the topic "Absorptive muffler"

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Knobloch, Karsten, Lars Enghardt, and Friedrich Bake. "APU-Noise Reduction by Novel Muffler Concepts." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76762.

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For a GTCP36-28 auxiliary power unit (APU), a set of mufflers has been designed and tested for some representative operating conditions. The first muffler design uses cavities of different sizes in conjunction with a bias flow for efficient broadband sound absorption. The second design — also expected to perform well over a large frequency range — makes use of a variable perforation and some porous absorber material. The acoustic damping performance of the mufflers was assessed using a downstream section of dedicated microphone probes. Individual spectra and circumferential averages have been computed and are used for a comparison to a hard-walled duct section of the same length. Results show a reasonable broadband absorption for most configurations. For one operating point, significant differences were found while comparing the performance of the cavity muffler with and without bias flow. The results suggest, that a small amount of air — less than initially expected — is sufficient to obtain the desired noise reduction.
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Yan, Li, and Weikang Jiang. "A Simple Method for Measuring Muffler Transmission Loss With PU Probes." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62585.

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The conventional approaches for measuring muffler transmission loss based on measurement in impedance tube are mainly decomposition methods and transfer matrix method. The decomposition method needs an anechoic termination, but it is not easy in some cases particularly for low frequency measurement. Two-load method and two-source method based on transfer matrix techniques are considered to be an alternative approach which does not require an anechoic termination. PU probe can measure both sound pressure and particle velocity, which is applied to some acoustic measurement such as absorption coefficient in recent years. A straightforward method for measuring muffler transmission loss by two PU probes measuring particle velocity at the inlet and outlet of muffler is presented. The four-pole parameters of the muffler can be calculated directly. The transmission loss measured by the PU method agrees well with the result measured by conventional four-pole method and FEM result. To instruct the approach, the influence of measurement distance between PU probe and the inlet or outlet of muffler and ambient noise are analyzed, which gives comprehensive suggestions for measurement set up.
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Veloso, Rafael, Robert Fairbrother, and Yasser Elnemr. "A 3D Linear Acoustic Network Representation of Mufflers with Perforated Elements and Sound Absorptive Material." In Noise and Vibration Conference and Exhibition. SAE International, 2017. http://dx.doi.org/10.4271/2017-01-1789.

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Ishihama, Masao, and Hiromitsu Sakurai. "Motor Vehicle Exterior Sound Quality Improvement for Indoors." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14041.

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The objectives of this study are these three items. 1) To find better indices than dB(A) for representing annoyances caused by motor vehicle traffic noise along highways. 2) To find the frequency range of motor vehicle exterior noise that should primarily be controlled to achieve better indoor sound environment along highways. 3) To find suitable vehicle driving conditions for evaluating indoor sound environment. To obtain the desired results psycho-acoustic experiments were conducted. Firstly, sound samples were collected with microphones placed at such locations as on a sidewalk, in front of a small house and at the center of a room inside of the house. The number of test vehicles was fifteen, consisting of six motorcycles and nine passenger cars. The driving conditions were full acceleration and mild acceleration usually found in normal traffic flow. Secondly, semantic differentiation method was used. Ten pairs of adjectives were used to scale the impressions of each sound sample. Finally, physical characters of the sound samples and their subjective evaluations were compared. The results were obtained as follows. 1) Six sound samples got more uncomfortable impression at indoors. These sound samples were collected by vehicles with sport-type mufflers. 2) The samples that indoor sound quality is degraded than outdoor contain high power in low frequency range below 200 Hz. These low frequency components penetrate through the housing walls more easily than higher frequency components. 3) The degradation of comfort impression was found in mild acceleration conditions. The low frequency components of sound samples for mild acceleration are larger than those for full acceleration. Though the throttle is not fully open in mild acceleration, low engine speed generates low frequency components, and eventually increased indoor sound power in the frequency range. The conclusions drawn from these results are, 1) Indoor sound samples should be included for evaluating sound environment along highways. 2) Mild acceleration is a better driving condition for evaluating indoor sound environment along highways. In this condition, very low engine speed causes low frequency component emission that penetrate into housing more than in heavy accelerating conditions. 3) Engine exhaust systems that emit very loud low-frequency components should be focused upon in regulating traffic noise. 4) Extensive collection and analysis of housing sound insulation, absorption and resonance data along highways are necessary for further investigations. 5) Better psycho-acoustic experiment methods should be developed for investigating sound context effects on panelists.
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