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Relevant bibliographies by topics / Mitigation acoustic noise reduction

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Academic literature on the topic 'Mitigation acoustic noise reduction'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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Journal articles on the topic "Mitigation acoustic noise reduction"

1

Sahu, Ashish Kumar, Abeka Selliah, Alaa Hassan, Moien Masoumi, and Berker Bilgin. "Experimental Evaluation of Acoustical Materials for Noise Reduction in an Induction Motor Drive." Machines 12, no. 8 (2024): 499. http://dx.doi.org/10.3390/machines12080499.

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Electric propulsion motors are more efficient than internal combustion engines, but they generate high-frequency tonal noise, which can be perceived as annoying. Acoustical materials are typically suitable for high-frequency noise, making them ideal for acoustic noise mitigation. This paper investigates the effectiveness of three acoustical materials, namely, 2″ Polyurethane foam, 2″ Vinyl-faced quilted glass fiber, and 2″ Studiofoam, in mitigating the acoustic noise from an induction motor and a variable frequency inverter. Acoustic noise rates at multiple motor speeds, with and without the a

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Azimi, Mariam, and Mohammadreza Azimi. "Noise Mitigation in Buildings Using Sound Absorbing Materials." NOISE THEORY AND PRACTICE 1, no. 1 (2015): 12–16. https://doi.org/10.5281/zenodo.1469408.

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Noise, generally defined as undesirable sound, is characterized in terms of the pressure of the sound wave. The improvement on the human quality of life and the continuous growth in population in developing and developed societies, have exacerbated the environmental and financial issues. Some of these problems are noise and the different types of human an industrial wastes. Many natural products have been recently developed and tested for acoustic applications. Sound-absorbing materials absorb most of the sound energy striking them and reflect very little. Therefore, sound-absorbing materials

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Yun-Ke, Luo, Song Li-Zhong, Zhang Chao, and Ni Yi-Qing. "Experimental evaluation and numerical interpretation of various noise mitigation strategies for in-service elevated suburban rail." Measurement 219, no. 2023 (2023): 113276. https://doi.org/10.1016/j.measurement.2023.113276.

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This research evaluates the efficiency of five noise mitigation measures including rubber floating slab track, straight noise barrier, track acoustic absorber, track-side noise barrier, semi-closed noise barrier, and a combined strategy on an elevated railway through in-situ measurements. In-situ experiments were conducted by sequen- tially installing various mitigation measures for comparative evaluation. A numerical model was then developed to interpret the noise control characteristics of the mitigation measures. The experimental results indicate that the rubber floating slab track can miti

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Jarnut, Marcin, Jacek Kaniewski, and Mariusz Buciakowski. "Review on Noise Generation Issues and Noise Mitigation Methods in Electric Vehicle Charging Systems." Energies 18, no. 4 (2025): 778. https://doi.org/10.3390/en18040778.

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This paper presents an overview of issues related to noise generation in electric vehicle (EV) charging systems. It discusses the requirements for noise reduction in locations where charging stations are most commonly installed. The primary sources of noise in EV charging stations are identified, considering their design and configuration. The results of acoustic tests for specific noise sources and entire charging stations are presented, including measurements of sound pressure level (SPL), acoustic imaging, and the generated acoustic spectrum. The paper also describes noise reduction methods

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Xiong, Zixiang, Xuxu Zhuang, Zhaoyong Sun, and Liuxian Zhao. "Coupled Helmholtz resonators for broadband Aeroacoustic noise mitigation." Sound & Vibration 59, no. 1 (2024): 1702. https://doi.org/10.59400/sv1702.

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As a structurally simple acoustic element, Helmholtz resonators can exhibit strong resonance when acoustic waves enter the cavity, thus providing excellent sound absorption effects. Consequently, they are widely applied in automotive engine and exhaust systems. This paper systematically investigates the noise reduction performance of multiple coupled Helmholtz resonators under conditions with and without tangential flow. A finite element simulation model with multiple Helmholtz resonators is established by employing COMSOL Multiphysics software to solve the linearized Navier-Stokes equations i

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SOUSA, Laura, Luís GODINHO, and Paulo AMADO MENDES. "Enhancing railway noise reduction through advanced multilayer acoustic absorbent systems with tunable resonators." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 2 (2024): 9027–37. http://dx.doi.org/10.3397/in_2024_4174.

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Railway noise poses a significant environmental challenge, prompting the need for effective mitigation strategies. In response, noise barriers are often employed to reduce noise near railways. This research focuses on the use of porous materials, more specifically porous concrete, for acoustic absorption, particularly in the context of railway noise reduction. A novel approach is proposed, wherein porous multilayer metamaterial systems are developed, with each layer's macroscopic parameters strategically optimized to enhance the overall sound absorption curve. Additionally, to broaden the freq

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Fusaro, Gioia, Xiang Yu, Zhenbo Lu, Fangsen Cui, and Jian Kang. "A Metawindow with Optimised Acoustic and Ventilation Performance." Applied Sciences 11, no. 7 (2021): 3168. http://dx.doi.org/10.3390/app11073168.

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Crucial factors in window performance, such as natural ventilation and noise control, are generally conceived separately, forcing users to choose one over the other. To solve this dualism, this study aimed to develop an acoustic metamaterial (AMM) ergonomic window design to allow noise control without dependence on the natural ventilation duration and vice versa. First, the finite element method (FEM) was used to investigate the noise control performance of the acoustic metawindow (AMW) unit, followed by anechoic chamber testing, which also served as the validation of the FEM models. Furthermo

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Li, Jinyu, Gang Cao, Shujiao Chen, Xiaoyan Lei, and Zhongqiu Zuo. "Study on superposition sound field of filter devices used in power converter stations." Journal of Physics: Conference Series 3031, no. 1 (2025): 012010. https://doi.org/10.1088/1742-6596/3031/1/012010.

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Abstract High-Voltage Direct-Current (HVDC) transmission systems provide a critical means of delivering clean energy to economically developed areas. However, noise pollution from converter stations, particularly from filter devices such as capacitors and reactors, has become a significant concern. This paper investigates the acoustic noise generated by these filter devices, focusing on the superposition of sound fields produced by capacitors and reactors. The theoretical analysis of sound pressure superposition reveals the influence of phase differences between the sound waves emitted by each

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Brick, Haike, and Jenny Böhm. "Field-testing of noise abatement measures." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 7 (2023): 830–37. http://dx.doi.org/10.3397/in_2022_0117.

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The strengthening of rail transport must be accompanied by a reduction in emissions. Regarding acoustics, innovative measures to increase noise protection must therefore be developed and investigated. Nevertheless, the determination of the sound reduction effect of mitigation measures on the railway infrastructure or in the propagation path is not yet standardised. There is a need for the development of a measurement and evaluation procedure, which is practice-oriented, reliable and allows the assessment of innovative measures in approval procedures. The German Centre for Rail Traffic Research

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Ahmed, Shakeel, Muhammad Tahir Akhtar, and Xi Zhang. "Online acoustic feedback mitigation with improved noise‐reduction performance in active noise control systems." IET Signal Processing 7, no. 6 (2013): 505–14. http://dx.doi.org/10.1049/iet-spr.2012.0204.

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Dissertations / Theses on the topic "Mitigation acoustic noise reduction"

1

Elamin, Mohammed. "Acoustic noise mitigation of switched reluctance machines through skewing methods." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1515760839110199.

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Fuller, Ryan Michael. "Adaptive Noise Reduction Techniques for Airborne Acoustic Sensors." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1355361066.

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Pupadubsin, Ruchao. "Mitigation techniques for acoustic noise and vibration in switched reluctance drives." Thesis, University of Newcastle upon Tyne, 2018. http://hdl.handle.net/10443/4186.

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Switched reluctance machines (SRM) have become an attractive rotating electrical machine in many applications because they have no permanent magnets, have robust structures and high fault tolerance. However, the crucial drawback of the SRM that limits the range of applications, is the acoustic noise and vibration often associated with this technology. The major source of vibration comes from the high deformation of the SRM stator stack, caused primarily by high radial magnetic forces. Vibration behaviour of di erent SRM topologies is analyzed by using nite element software to calculate the mag

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Gundogmus, Omer. "SIMULTANEOUS TORQUE RIPPLE AND ACOUSTIC NOISE MITIGATION IN SWITCH RELUCTANCE MACHINES." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1579790717180753.

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Zheng, Haosheng, and Kaichun Zhang. "Noise Analysis of Computer Chassis and Secondary Sound Source Noise Reduction." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18547.

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This article focuses on computer noise analysis and noise reduction processing. With the popularity of computers, people are increasingly demanding the comfort of using computers. Solving the noise problem of the computer case can make the working environment more comfortable. People working in a noisy environment for a long time can cause anxiety and the quality of work is not high. The main purpose of this paper is to analyse the characteristics of computer noise and to reduce the noise of the chassis through the secondary sound source. Through the comparison of the experimental and simulati

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Robert, Rene Jean. "Measuring noise level reduction using an artificial noise source." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54480.

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Buildings located near airports may be subjected to significant noise levels due to aircraft flyovers. Aircraft noise is particularly annoying when compared to other traffic noises due to its intermittent nature. While noise control is typically performed at the source, sound insulation programs are in place to improve the acoustic performance of a residence affected by the flyovers. Noise Level Reduction (NLR) is a common metric used in the United States to determine whether a residence qualifies for such programs. Sound insulation programs are available to houses that have an indoor Day Nigh

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Cameron, Derrick E. (Derrick Eugene). "Origin and reduction of acoustic noise in variable-reluctance motors." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/57729.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.<br>Includes bibliographical references (leaves 116-118).<br>by Derrick E. Cameron.<br>M.S.

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Slagle, Adam Christopher. "Low Frequency Noise Reduction Using Novel Poro-Elastic Acoustic Metamaterials." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64200.

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Low frequency noise is a common problem in aircraft and launch vehicles. New technologies must be investigated to reduce this noise while contributing minimal weight to the structure. This thesis investigates passive and active control methods to improve low frequency sound absorption and transmission loss using acoustic metamaterials. The acoustic metamaterials investigated consist of poro-elastic acoustic heterogeneous (HG) metamaterials and microperforated (MPP) acoustic metamaterials. HG metamaterials consist of poro-elastic material with a periodic arrangement of embedded masses acting as

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Blaschke, Peter Gerhard. "Vibro-acoustic design tool for noise optimization of rotating machines." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/7355.

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GAGLIARDI, PAOLO. "A study of airport noise impact and strategies for its mitigation and exposure reduction." Doctoral thesis, Università di Siena, 2017. http://hdl.handle.net/11365/1013780.

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Aviation noise pollution in urban areas can be considered as a major problem and source of conflict between airport infrastructure and residents. Its effects could significantly limit the growth of aviation as well as affect public health, mainly when airports are located near residential areas. Noise control measures both at the source and at the receivers are often expensive and limited. Nevertheless, they represent the most viable solutions for contrasting this phenomenon due to the difficulty of finding suitable measures to reduce aircraft noise along its propagation path. This work is foc

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Books on the topic "Mitigation acoustic noise reduction"

1

M, Elliott David, Bock Lawrence A, and NASA Glenn Research Center, eds. Some acoustic results from the Pratt and Whitney Advanced Ducted Propulsor: Fan 1. National Aeronautics and Space Administration, Glenn Research Center, 1999.

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W, Premo John, Hersh Alan S, Langley Research Center, and United States. National Aeronautics and Space Administration., eds. Advanced turbofan duct liner concepts. National Aeronautics and Space Administration, Langley Research Center, 1999.

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United States. National Aeronautics and Space Administration., ed. Prediction of the noise from a propeller at angle of attack. National Aeronautics and Space Administration, 1990.

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N, Dalton William, and NASA Glenn Research Center, eds. Lobed mixer design for noise suppression: Acoustic and aerodynamic test data analysis. National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Jones, Michael G. A comparison of signal enhancement methods for extracting tonal acoustic signals. National Aeronautics and Space Administration, Langley Research Center, 1998.

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Center, NASA Glenn Research, ed. Acoustic and aerothermal performance test of the axisymmetric coannular ejector nozzle. National Aeronautics and Space Administration, Glenn Research Center, 2000.

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1961-, Schein David B., Gridley Doreen, Langley Research Center, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., eds. Analytical study of acoustic response of a semireverberant enclosure with application to active noise control. National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1985.

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A, Boxwell D., Spencer R. H, Ames Research Center, and United States. Army Aviation Research and Technology Activity., eds. Review and analysis of the DNW/model 360 rotor acoustic data base. National Aeronautics and Space Administration, Ames Research Center, 1989.

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V, Tsynkov S., and Institute for Computer Applications in Science and Engineering., eds. Quadratic optimization in the problems of active control of sound. ICASE, NASA Langley Research Center, 2002.

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Alan, Egolf T., and Langley Research Center, eds. Evaluation of a doubly-swept blade tip for rotorcraft noise reduction. National Aeronautics and Space Administration, Langley Research Center, 1992.

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Book chapters on the topic "Mitigation acoustic noise reduction"

1

Diethorn, Eric J. "Subband Noise Reduction Methods for Speech Enhancement." In Acoustic Signal Processing for Telecommunication. Springer US, 2000. http://dx.doi.org/10.1007/978-1-4419-8644-3_9.

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Benesty, Jacob, Constantin Paleologu, Tomas Gänsler, and Silviu Ciochină. "Echo and Noise Suppression as a Binaural Noise Reduction Problem." In A Perspective on Stereophonic Acoustic Echo Cancellation. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22574-1_8.

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He, Yuanpeng, Xinghuan Wang, Qing Zhou, Xiaozhen Sheng, and Yulong He. "Bridge Noise Reduction by Acoustic Short Circuit." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-7852-6_75.

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Burnham, Rianna E. "Acoustic Disturbance Risk Estimates and Mitigation Strategies: An Animal-Centric Approach." In The Effects of Noise on Aquatic Life. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-50256-9_190.

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Burnham, Rianna E. "Acoustic Disturbance Risk Estimates and Mitigation Strategies: An Animal-Centric Approach." In The Effects of Noise on Aquatic Life. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-10417-6_190-1.

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Malinka, Chloe E., Dom J. Tollit, Krista Trounce, and Jason D. Wood. "Evaluating the Benefits of Noise Reduction Mitigation: The ECHO Program." In The Effects of Noise on Aquatic Life. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-10417-6_100-1.

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Malinka, Chloe E., Dominic J. Tollit, Krista B. Trounce, and Jason D. Wood. "Evaluating the Benefits of Noise Reduction Mitigation: The ECHO Program." In The Effects of Noise on Aquatic Life. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-50256-9_100.

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Singh, Charanjeet, and S. Deswal. "Noise Reduction Analysis in the Industrial Environment by Acoustic Materials." In Springer Proceedings in Energy. Springer Nature Singapore, 2024. https://doi.org/10.1007/978-981-97-6548-5_3.

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Juvanna, I., Uppu Ramachandraiah, and G. Muthukumaran. "Enhanced Acoustic Noise Reduction Techniques for Magnetic Resonance Imaging System." In Communications in Computer and Information Science. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-35299-7_1.

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Singh, Charanjeet, and S. Deswal. "Noise Reduction Analysis in the Industrial Environment by Acoustic Materials." In Springer Proceedings in Materials. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-5902-6_10.

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Conference papers on the topic "Mitigation acoustic noise reduction"

1

Hema, R., S. Shivani, and M. Yuvarai. "Enhancing Underwater Acoustic Noise Reduction Method With Advanced Noise Reduction Techniques." In 2024 International Conference on Expert Clouds and Applications (ICOECA). IEEE, 2024. http://dx.doi.org/10.1109/icoeca62351.2024.00102.

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Roebben, Arnout, Toon Van Waterschoot, and Marc Moonen. "Cascaded Noise Reduction and Acoustic Echo Cancellation Based on an Extended Noise Reduction." In 2024 32nd European Signal Processing Conference (EUSIPCO). IEEE, 2024. http://dx.doi.org/10.23919/eusipco63174.2024.10714941.

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Li, Zhuohan, Dongwen Xue, Jiafeng Yang, Qun Yan, and Jian Xu. "Experimental Method of Segmented Acoustic Liners Performance in Noise Reduction." In 2024 7th International Conference on Information Communication and Signal Processing (ICICSP). IEEE, 2024. https://doi.org/10.1109/icicsp62589.2024.10809265.

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Khalil, Ahmed E. E., and Ashwani K. Gupta. "Acoustic Noise Reduction Under Distributed Combustion." In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3788.

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Colorless Distributed Combustion (CDC) has been shown to provide unique benefits on ultra-low pollutants emission, enhanced combustion stability, and thermal field uniformity. To achieve CDC conditions, fuel-air mixture must be properly prepared and mixed with hot reactive gases from within the combustor prior to the mixture ignition. The hot reactive gases reduce the oxygen concentration in the mixture while increasing its temperature, resulting in a reaction zone that is distributed across the reactor volume, with lower reaction rate to result in the same fuel consumption. The conditions to

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Andrés Ruiz, Víctor Tomás, José Martínez Casas, Javier Carballeira Morado, Francisco David Denia Guzmán, and D. J. Thompson. "Railway rolling noise mitigation through optimal track design." In VI ECCOMAS Young Investigators Conference. Editorial Universitat Politècnica de València, 2021. http://dx.doi.org/10.4995/yic2021.2021.12583.

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The main goal of the present work lies in the identification of the railway track properties that influence acoustic radiation, as well as in the analysis of these properties for the reduction of sound levels. This is achieved through a dynamic model of the railway wheel and track that allows the study of rolling noise, produced as a result of wheel/rail interaction. The vibroacoustic calculation methodology consists of characterising the railway wheel and track, using finite element techniques and periodic structure theory [1,2], respectively. Subsequently, the response of the railway compone

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Soobramaney, Pregassen, George Flowers, and Robert Dean. "Mitigation of the Effects of High Levels of High-Frequency Noise on MEMS Gyroscopes Using Microfibrous Cloth." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47378.

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MEMS gyroscopes are being used in a variety of applications such as camcorders, vehicle stability control and game controllers. Sometimes they are used in harsh environments such as high levels of high-frequency noise. If the frequency of the noise coincides with the natural frequency of the gyroscope, the output of the latter is corrupted. Experiments were performed to demonstrate the effects of noise on MEMS gyroscopes. The focus of this research is to investigate a passive approach to attenuate the effects of noise on MEMS gyroscopes using microfibrous cloth. The candidate materials are mad

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Sanchez Climent, Francisco Vicente, and Claudio Bertolini. "Estimating a Viscous Damping Model for a Vibrating Panel in Contact with an Acoustic Trim Enhanced with Particle Dampers." In 13th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference. SAE International, 2024. http://dx.doi.org/10.4271/2024-01-2917.

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<div class="section abstract"><div class="htmlview paragraph">Particle Dampers (PDs) are passive devices employed in vibration and noise control applications. They consist of a cavity filled with particles that, when fixed to a vibrating structure, dissipate vibrational energy through friction and collisions among the particles. These devices have been extensively documented in the literature and find widespread use in reducing vibrations in structural machinery components subjected to significant dynamic loads during operation. However, their application in reducing the vibration

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Stark, Callum, Weichao Shi, Yunxin Xu, and Moritz Troll. "Marine Ducted Thruster Underwater Radiated Noise Control Through Leading-Edge Tubercle Blade Modifications - a Numerical Hybrid Approach." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78157.

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Abstract Anthropogenic-related underwater radiated noise (URN) has a detrimental impact on marine creatures who utilise the acoustic environment to perform basic living functions. Ambient ocean noise levels are increasing due to the growth of global shipping activity, where the propeller under cavitating conditions typically dominates the URN signature of marine vessels. Therefore, reducing cavitation severity and the subsequent URN is critical for future marine craft. This paper aims to assess the noise mitigation capability of LE tubercles on a benchmark Kaplan-type ducted propeller blade in

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Feng, Xiliang, Yue Zhu, Ziheng Chen, Haolong Wu, Ziyang Liu, and Jin Gan. "Acoustic Radiation Study of Wind-Induced Aerodynamic Noise From a Large Cruise Ship Chimney Based on the CAS-RTM Method." In ASME 2024 43rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/omae2024-126619.

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Abstract The cruise ship’s chimney, situated at the highest position of the top deck, is susceptible to aerodynamic noise induced by the sea’s wind field, thus affecting the comfort of passengers on the open deck. This study conducted real measurements on wind-induced aerodynamic noise from a large cruise ship chimney. Based on offshore wind conditions, CFD simulations were conducted to derive the surface pulsation pressure, which in turn was input to the acoustic boundary elements and translated into a compact sound source. Then, employing the Compact Acoustic Source combined with the Ray Tra

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Baudin, Eric, Thomas Folegot, Michel Andre, Christian Audoly, Enrico Rizzuto, and Lanfranco Benedetti. "Noise Footprint: A Proposal Within the Framework of FP7 AQUO Project to Define a Goal Based Approach Towards the Reduction of Underwater Radiated Noise From Shipping." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24424.

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The Marine Strategy Framework Directive has officially stated as soon as 2008 the anthropogenic noise due to shipping were to be mitigated. The policy makers, the yards and the ship owners still strongly rely on the expert studies and guidelines to find the appropriate methodology to assess and then mitigate the acoustic pollution impact shipping on the marine biota. To address this issue, the project AQUO “Achieve QUieter Oceans by shipping noise footprint reduction” (www.aquo.eu) started in October 2012 for 3 years. The AQUO project was built in the scope of FP7 European Research Framework.

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Reports on the topic "Mitigation acoustic noise reduction"

1

Krasnov, A. V., and I. V. Deryabin. Practical method for reducing the noise of a vehicle heating and ventilation installation. КШП. ОМД, 2024. https://doi.org/10.12731/avkrasnovivderyabin.

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Studies of the acoustic radiation of a heating and ventilation unit were carried out on a test bench mounted in an anechoic chamber, with several design options for the housing and control dampers of the heating and ventilation unit containing sound-absorbing elements. Graphic dependences of one-third octave values of sound levels at the studied measuring point at all rotation speeds of the electric fan impeller are presented. A conclusion is made about the effectiveness of the lining of the housing walls, which allows achieving a reduction in overall noise levels to 4.1 dBA.

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Singh, Niranjan. A Method of Sound Wave Diffusion in Motor Vehicle Exhaust Systems. Unitec ePress, 2017. http://dx.doi.org/10.34074/ocds.072.

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It is common practice among young vehicle owners to modify the exhaust system of their vehicle to reduce exhaust backpressure with the perception that the output power increases. In the process of backpressure reduction, the output noise (Whakapau) of the vehicle also increases correspondingly. The conflict of interest that arises from modified vehicle exhaust systems and the general public is well publicised. This prototype was designed to meet the demands of exhaust back pressure reduction while at the same time mitigate the sound output of the vehicle. The design involves lining a cylindric

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