Relevant bibliographies by topics / Dynamic muffler

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Dynamic muffler'

Author: Grafiati
Published: 28 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Dynamic muffler"

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Zhou, Xin Xiang, Da Meng Han, Xing Long Lei, Cheng Liu, and Guang Yu Hu. "Muffler of High Quality and Efficiency Based on Structural Dynamic Optimization and the Modal Analysis." Advanced Materials Research 753-755 (August 2013): 1156–60. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.1156.

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According to the mechanism and spectrum characteristics of an oil-free air compressor noise source, determined the muffler installed at the air inlet. According to the characteristics of noise source, muffler is designed into type of expansion chamber, considering the structural dynamic parameters, by means of optimization method to determine the size, and the finite element modal analysis is conducted. By solving the muffler's inherent frequency and mode of vibration, knows weather each order natural frequency is away from the peak frequency, the structural dynamics of the muffler can be modification. Methods of structure modal analysis and dynamic optimization on the muffler provided reliable reference to design a high efficient new 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 (December 19, 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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Mohamad, Barhm, Jalics Karoly, Andrei Zelentsov, and Salah Amroune. "A hybrid method technique for design and optimization of Formula race car exhaust muffler." International Review of Applied Sciences and Engineering 11, no. 2 (August 2020): 174–80. http://dx.doi.org/10.1556/1848.2020.20048.

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AbstractIn this work a multilevel Computational Fluid Dynamics (CFD) analysis has been applied for the design of a Formula race car exhaust muffler with improved characteristics of sound pressure level (SPL) and fluid dynamic response. The approaches developed and applied for the optimization process range from the 1D to fully 3D CFD simulation, exploring hybrid approaches based on the integration of a 1D model with 3D tools. Modern mufflers typically have a complex system of chambers and flow paths. There are a variety of sound damping and absorbing mechanisms working to quiet the sound flowing through a muffler and piping system. Two calculation methods were selected for this study. The muffler has a complex inner structure containing perforated pipe and fiber material. Computer-aided design (CAD) file of the muffler was established for developing Finite Element Analysis (FEA) model in AVL BOOST v2017 and another commercial advanced design software (SolidWorks 2017). FEA model was made to monitor the flow properties, pressure and velocity. After the model was verified, sensitivity studies of design parameters were performed to optimize the SPL of the muffler. The software analysis results are included in the paper. Recommendations are made for obtaining smoother SPL curves for various measurement methods.
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Geddes, Earl R. "Active muffler with dynamic tuning." Journal of the Acoustical Society of America 92, no. 2 (August 1992): 1197–98. http://dx.doi.org/10.1121/1.404025.

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Shan, Chang-ji, Yi-duo Bian, Ting-ting Dai, Cai Yan, Guo-fang Du, and Hai-tao Yang. "The Design of Follow-up Hydraulic Muffler Based on Spring-Damp Regulating Device." E3S Web of Conferences 79 (2019): 01006. http://dx.doi.org/10.1051/e3sconf/20197901006.

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The follow-up hydraulic muffler can make the natural frequency of the muffler equal to systematic pulsation frequency in time by changing the section area of the quality chamber so as to achieve the best attenuation effect. In this paper, a spring-damp regulator is installed on the basis of the hydraulic muffler, and the static and dynamic characteristics of the follow-up hydraulic muffler are analyzed by measuring the rotational speed of the pump with the sensor. The results show that the hydraulic muffler based on the spring-damp regulator can effectively attenuate the pulsation.
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Sofia, Evi, and Ilham Achmal Hakiki. "ANALISIS PENGARUH PEMASANGAN MUFFLER PADA MESIN PESAWAT TANPA AWAK LSU 02 TERHADAP TINGKAT KEBISINGAN." Volume 22 No. 2 Desember 2020 22, no. 2 (November 25, 2020): 51–60. http://dx.doi.org/10.23969/infomatek.v22i2.3304.

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LSU-02 merupakan pesawat tanpa awak yang dikembangkan oleh Pustekbang LAPAN dan mulanya akan menggunakan mesin 3W28i. Namun karena mesin 3W-28i memiliki muffler yang panjang, maka dalam penelitian ini akan dilakukan modifikasi dengan memvariasikan panjang dan diameter muffler. Selanjutnya dilakukan simulasi untuk mengetahui pengurangan tingkat kebisingan yang dihasilkan. Proses simulasi menggunakan metode computational fluid dynamic (CFD) dengan menggunakan perangkat lunak ANSYS Harmonic Acoustic. Dari hasil simulasi diperoleh kesimpulan jika semakin besar diameter muffler (80 mm) memberi kontribusi yang lebih baik dalam mengurang tingkat kebisingan sebesar 21.587 dB. Kemudian pengaruh panjang muffler terhadap pengurangan kebisingan tidak terlalu besar, karena selisih pengurangan kebisingan hanya sebesar 0,658 dB. Sehingga disarankan untuk menggunakan muffler model 5 dengan diameter 80 mm dan panjang 130 mm untuk dipasangkan pada mesin 3W-28i karena memiliki ukuran yang lebih kecil namun mampu mengurangi kebisingan hingga 20,929 dB.
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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 (March 30, 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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Siano, Daniela, Fabio Bozza, and Fabio Auriemma. "Acoustic and fluid-dynamic optimization of an automotive muffler." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 227, no. 5 (December 10, 2012): 735–47. http://dx.doi.org/10.1177/0954407012465689.

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Shi, Lei Ming, Guang Hui Jia, Zhi Fei Zhang, and Zhong Ming Xu. "Analysis and Research of the Combustion Process of YN4100QB Diesel Engine." Advanced Materials Research 744 (August 2013): 35–39. http://dx.doi.org/10.4028/www.scientific.net/amr.744.35.

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In order to obtain the foundation to the research on the Diesel Engine YN4100QB combustion process, exhaust, the optimal design of combustion chamber and the useful information for the design of exhaust muffler, the geometric model and mesh model of a type internal combustion engine are constructed by using FIRE software to analyze the working process of internal combustion engine. Exhaust noise is the main component of automobile noise in the study of controlling vehicle noise. It is primary to design a type of muffler which is good for agricultural automobile engine matching and noise reduction effect. The present car mufflers are all development means. So it is bound to cause the long cycle of product development and waste of resources. Even sometimes not only can it not reach the purpose of reducing the noise but also it leads to reduce the engine dynamic. The strength of the exhaust noise is closely related to engine combustion temperature and pressure. The calculation and initial parameters are applied to the software based on the combustion model and theory. According to the specific operation process of internal combustion engine. Five kinds of common operation condition was compiled. It is obtained for the detailed distribution parameters of combusted gas temperature pressure . It is also got for flow velocity of the fields in cylinder and given for the relation of the parameters and crankshaft angle for the further research. At the same time NOx emissions situation are got. The numerical results show that not only does it provide the 3D distribution data in different crank shaft angle inside the cylinder in the simulation of combustion process, but also it provides a basis for the engine combustion ,emission research, the optimization design of the combustion chamber and the useful information for the designs of muffler.
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Liu, Zhong Da, Yu Guo, Lin Chen, and Yan Gao. "Optimization Analysis of Exhaust Muffler for a Hybrid Car by GT-Power." Applied Mechanics and Materials 246-247 (December 2012): 17–21. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.17.

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Both the attenuation performance and the aerodynamic performance should be carefully considered in the muffler design of automobiles. Aim to improve the exhaust-muffler properties of a hybrid car, a design work has been done and introduced in the paper. Firstly, the volume analysis method was utilized to give a rough estimation. Then, the GT-Power software was employed to construct the coupled simulation models of the process of acoustic performance and engine running, by which the insertion loss analysis and the exhaust back pressure difference analysis were completed. By combined the simulation with the experiment analysis, the acoustics performance and air dynamic characteristics of each model was obtained, and it provides the theoretical fundament for the improved design.
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Dissertations / Theses on the topic "Dynamic muffler"

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Čepl, Ondřej. "Tlumení tlakových pulzací a snižování hluku v potrubních systémech." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444301.

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The diploma thesis deals with pressure pulsations in pipeline system with dynamic muffler. There is presented original geometry of side-branch resonator. Pressure pulsations are solved by a created mathematical model, numerical simulations and verified by an experimental approach. The influence of dynamic and bulk viscosity is involved in derived governing equations. A system of nonlinear equations is solved by genetic algorithm and frequency dependent relationship of bulk viscosity of air is determined afterwards. The correct function of used pressure sensors is tested. The processing of experimental data is performed by the fast Fourier transform with coherent sampling. Finally, a comparison of analytical, numerical and experimental approaches is introduced for different geometric variants of presented muffler.
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Chen, Jonathan. "DEVELOPMENT OF A MUFFLER INSERTION LOSS FLOW RIG." UKnowledge, 2019. https://uknowledge.uky.edu/me_etds/131.

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Mufflers and silencers are commonly used to attenuate noise sources such as internal combustion engines and HVAC systems. Typically, these environments contain mean flow that can affect the acoustic properties of the muffler components and may produce flow generated noise. To characterize the muffler performance, common metrics such as insertion and transmission loss and noise reduction are used in industry. Though transmission loss without flow is often measured and is a relatively simple bench top experiment and useful for model validation purposes, mean flow can significantly affect the muffler performance. There are a few existing and commercial transmission loss rigs that incorporate flow into the measurement procedure. These rigs are useful for model verification including flow but do not predict how the muffler will perform in the system since the source, termination, and pipe lengths significantly impact performance. In this research, the development of an insertion loss test rig is detailed. This testing strategy has the advantage of being simpler, quantifying the self-generated noise due to flow, and taking into account the effect of tailpipe length and a realistic termination. However, the test does not include the actual source and is not as useful for model validation. An electric blower produces the flow and a silencer quiets the flow. Loudspeakers are positioned just downstream of the flow silencer and they are used as the sound source. The low frequency source is a subwoofer installed in a cylindrical enclosure that includes a conical transition from speaker to pipe. Special care is taken to reduce any flow generated noise. Qualification of the system is detailed by comparing the measured transmission loss, noise reduction, and insertion loss to one-dimensional plane wave models. The results demonstrate that the developed rig should be useful as a muffler evaluation tool after a prototype has been constructed. The rig can also be used for transmission loss and noise reduction determination which will prove beneficial for laboratory testing.
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Hua, Xin. "ADVANCED STUDIES ON TRANSFER IMPEDANCE WITH APPLICATION TO AFTER-TREATMENT DEVICES AND MICRO-PERFORATED PANEL ABSORBERS." UKnowledge, 2013. http://uknowledge.uky.edu/me_etds/30.

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This work is primarily comprised of five self-contained papers. Three papers are applications oriented. A common element in the first three papers is that micro-perforated panels (MPP), the permeable membranes in diesel particulate filters, and a source impedance are all modeled as a transfer impedance. The first paper deals with enhancing the performance of micro-perforated panels by partitioning the backing cavity. Several different backing schemes are considered which enhance the performance without increasing the total volume of the MPP and backing. In the second paper, a finite element modeling approach is used to model diesel particulate filters below and above the plane wave cutoff frequency. The filter itself is modeled using a symmetric finite element model and results are compared to plane wave theory. After the transfer matrix of the filters is known, it is used in three-dimensional finite and boundary element models. The third paper is a tutorial that shows how a source impedance can be modeled using transfer impedance approaches in finite element analysis. The approach used is useful for better understanding the resonance effects caused by pipes upstream and downstream of the exhaust. The fourth paper examines the best practice for the two-load transmission loss measurement. This method was integral to obtaining the measurements for validating the diesel particulate filter models. The fifth paper proposes transmission and insertion loss metrics for multi-inlet mufflers. It is shown that the transmission loss depends on the amplitude and phase relationship between sources (at the inlets) whereas insertion loss depends on both the source strength and impedance for each inlet.
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Book chapters on the topic "Dynamic muffler"

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Obikane, Yasuo. "Aeroacoustic Simulation in Automobile Muffler by Using the Exact Compressible Navier-Stokes Equation." In Computational Fluid Dynamics 2008, 93–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01273-0_9.

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Manning, Jane. "STEPHEN BARCHAN (b. 1982)Two Songs about Spiders (2010/2011)." In Vocal Repertoire for the Twenty-First Century, Volume 2, 5–7. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780199390960.003.0003.

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This chapter examines British composer Stephen Barchan’s Two Songs about Spiders (2010/2011), an enchanting little piece with a growing reputation. These vivid settings of well-loved nursery rhymes—including Little Miss Muffet and Itsy Bitsy Spider—will make an ideal encore after a demanding recital, but could serve equally well as an ‘appetizer’ at the start of a programme. The vocal writing certainly stretches the singer’s technical control and range, and a mezzo might be well suited to it, in view of the many low-lying passages. However, a soprano’s agility will be an advantage. Although its duration is only three minutes, the piece is packed with inventive detail, and dynamics and timbres change with breathtaking rapidity. The musical idiom is atonal and highly chromatic, but cohesive; intervals seem logical and are often repeated. Exciting leaps and scoops abound, with liberal use of glissandos, which helps considerably when approaching extremes of register. Some loud, single-note attacks will need care to conserve air and prevent them splintering under pressure.
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Conference papers on the topic "Dynamic muffler"

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Badykova, Lilia, Dmitry Stadnick, Kirill Afanasev, Alexander Igolkin, and Victor Sverbilov. "Study on Dynamics of Air Pressure Reducing Valve With Focus on the Noise Attenuation Problem." In 8th FPNI Ph.D Symposium on Fluid Power. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpni2014-7856.

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The noise in natural gas distribution systems is mainly caused by pressure reduction in shut-off and control valves. The aim of present research is to analyze dynamics of an air pressure reducing valve with a muffler installed at its output. An increase of output impedance can lead to a loss in stability and control accuracy. Therefore, the valve simulation model in software package MATLAB/Simulink is developed in order to study the muffler’s impact on static and dynamic performances of the pressure reducing valve. As a result of performed modeling and simulation the influence of the output throttle resistance on the system main operating parameters is obtained. The output data can be used to optimize sizing of the muffler for the air pressure reducing valve.
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Xinxiang Zhou, Suying Hu, Yu Cui, Shujun Guo, Rongliang Tian, and Yanling Tang. "Structure dynamic optional study of the oilless air compressor muffler." In 2011 IEEE International Conference on Computer Science and Automation Engineering (CSAE). IEEE, 2011. http://dx.doi.org/10.1109/csae.2011.5953300.

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Oh, Gyoko, and Masahiro Akei. "Dynamic Response and Analytical Approach on a Double Catalyst Muffler System Mounting on a Table." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10130.

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Abstract For preventing fatigue failures caused by the vibration stresses in a moving vehicle or an operating machine, it is important to clarify and predict dynamic response behaviors. Assuming a rigid installation, the vibration transmissibility of a double catalyst muffler system mounting on a table was examined through a vibration machine. Based on the measured data and by systematically taking vibration theories into consideration, a new prediction method of the vibration modes and parameters was proposed that takes account of vibration coupling and damping. A lumped vibration model with the eight-element and two mass points was set up, and the vibration response parameters were analyzed accurately from simultaneous equations of motion. In the vibration test, resonance peaks from the mounting table and muffler parts of two units were confirmed in three excitation drives. The first resonance peaks caused by the mounting table had lower frequency, but the vibration magnitudes from other parts at higher frequency were damped to a considerable degree. With examples where the mounting table was reinforced by a damping material bracket, and where the spring coefficient of the connecting pipe between the two units in the sample was changed, the resonance frequencies and transmissibilities were obtained by calculation using the analytical model, demonstrating the model’s general versatility as a prediction method.
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Yao, Xiaogang, and Changqi Cheng. "Gas Dynamic Modelling and Experiment Validation for the Exhaust Muffler of a Spark Ignition Engine." In International Off-Highway & Powerplant Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1994. http://dx.doi.org/10.4271/941734.

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Hatat, Nicolas-Ivan, François Lormier, David Chalet, and Pascal Chesse. "Study of Unsteady Airflow in Muffler and Air Box Equivalent Geometries." In ASME 2013 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icef2013-19055.

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The Internal Combustion Engines (ICE) are inherently sources of the flow’s unsteadiness in the intake and exhaust ducts. Unsteady flow has a direct impact on the engine’s behavior and performance by influencing the filling and emptying of the cylinder. Air intake boxes as well as muffler geometries, which are very commonly used on the two-wheeled vehicles, have an impact on pressure levels and so, on air filling and performances levels. Thus, the purpose of this paper is to identify and analyze different typical geometries of these elements (air box and muffler) by comparing the test bench results with those obtained by 3D and 1D calculations. In this way, it is possible to establish a methodology for modeling the air box and muffler based on experimental tests and the development of 3D and then 1D model. In a beginning, studies consist in describing the geometry of the air box and muffler using a combination of tubes and simple volumes. During one-dimensional simulations, the gases properties in a volume must be calculated taking into account a method of filling and emptying. Under transient conditions, the pipe element is considered essentially as one-dimensional. The gas dynamic is described by a system of equations: the equations of continuity, momentum and energy. In the three-dimensional case, all tubes and volumes are meshed and solved using various physical models, equations and hypotheses that will be detailed subsequently. The study is performed on a shock tube bench. One of the main points is that this type of experimental test allows to test easily different pressure ratios, different geometries and to measure direct and inverse flow. In this way, the propagation of a shock wave is studied in our different geometries and is compared to the pressure signals obtained with 1D and 3D simulations. Once the 1D modeling is obtained, it must be validated in order to be applied in a simulation for Internal Combustion Engine. Validation will be done by direct comparison of results at each stage to ensure that the models and assumptions used in the calculations are correct.
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Coskun, Umut Can, Hasan Gunes, Kemal Sarioglu, and Husnu Kerpicci. "Unsteady Flow Simulation in Suction Muffler of a Hermetic Reciprocating Compressor." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20042.

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In this study a numerical study of a suction muffler in a hermetic reciprocating compressor of a domestic refrigerator is performed using a finite volume based flow solver (Fluent). In order to reveal the behavior of the flow realistically, unsteady experimental pressure data has been used in the outlet boundary condition for the simulations. Detailed investigations are carried out to reveal the instantaneous flow behavior in different muffler sections such as channel and chambers based on the mass flow rate variation with respect to crankshaft angle. Power spectrum of pressure fluctuations at selected points help to reveal the noise characteristics of the muffler. This study gives a comprehensive insight into the interaction of muffler chambers with flow through the channel. In a previous study, the ratio of the chamber volumes were shown to be an important design parameter. To verify this assumption, three prototype muffler geometries were simulated. In these prototypes, the plate that divides the muffler into two chambers was moved by 7 mm and 10 mm in the direction to enlarge the second chamber. The flow through the prototype geometries were investigated numerically. The results showed that the aerodynamic performance increased while the aero-acoustic performance slightly decreased. Furthermore, this study aims to be an initial step to a more complicated optimization process which involves the inlet valve dynamics.
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Pavlov, G. I., and O. R. Sitnikov. "Modeling of dynamic processes in automotive engines noise mufflers." In 2020 International Conference on Dynamics and Vibroacoustics of Machines (DVM). IEEE, 2020. http://dx.doi.org/10.1109/dvm49764.2020.9243873.

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Zheng, Sifa, Peng Hao, Heng Xia, Xiaomin Lian, and Keqiang Li. "Dynamic Comprehensive Performance of Mufflers under Different Vehicle Running Conditions." In SAE 2010 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2010. http://dx.doi.org/10.4271/2010-01-0901.

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Reza, Md Shamim, P. A. Hagen, and R. S. Amano. "Multi-Dimensional Heat Transfer and Fluid Dynamics Analysis of a Lawnmower Tractor Exhaust System." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/cie-48244.

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The objective of this study was to investigate the present cooling system of a lawn mower tractor engine and come out with an idea to modify the system. The test section was created to measure the velocity and temperature around the engine compartment. Velocity and temperature measurements were collected at several different locations around the engine. To accomplish this, several Pressure transducers along with Pitot tubes and Thermocouples were placed at several predetermined locations based on their assumed experimental importance. Since the experiment was run in a laboratory setting, the Combustion products of the engine were vented to the environment through a venting system via a stainless steel hose. This hose was constructed to attach to both the tractor muffler and the building venting. Then, the instrumentation had to be sized and selected such that the data could be easily acquired and recorded. Next, the necessary data was collected using the selected instrumentation while running the engine in the laboratory space. This data was used to produce an accurate computer model for simulation and to compare several different design adaptations. Based on experimental and computational data, it is noticed that the engine compartment was exhausting hot air that was causing discomfort to the operator and potential harm to the area near their feet. Some modifications were recommended, such as the baffling system, fan system, and grill alterations as an attempt to alter the airflow characteristics of the engine compartment to redirect the hot air away from operator’s feet.
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Kanchan, Sumit, Rajesh Choudhary, Chavagani Brahmaiah, and Shahid Qayoom. "Modelling for Collective Effect of Muffler Geometric Modifications and Blended Microalgae Fuel Use on Exhaust Performance of a Four-Stroke Diesel Engine: A Computational Fluid Dynamics Approach." In NuGen Summit. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-28-2377.

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