Relevant bibliographies by topics / Noise control. Tractors Acoustic emission

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Academic literature on the topic 'Noise control. Tractors Acoustic emission'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Noise control. Tractors Acoustic emission"

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Fanigliulo, Roberto, Lindoro Del Duca, Laura Fornaciari, Renato Grilli, Roberto Tomasome, and Danieele Pochi. "Efficiency of an ANC system in the tractor cabin under controlled engine workload." Noise Control Engineering Journal 68, no. 5 (September 1, 2020): 339–57. http://dx.doi.org/10.3397/1/376829.

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The noise at the driver seat of an agricultural tractor is produced mostly by the engine. Its characteristic broadband noise spectrum varies considerably with engine workload. The passive noise control techniques adopted in tractor cabins, based on the application of sound-absorbing and sound-proofing materials, are effective against medium-high frequencies noise components. The residual noise in sound-proof cabins is characterized by tonal emissions with low frequency components (< 500 Hz) but regarded as responsible for various disorders and diseases following long-term exposure. In addition to the "A" weighting filter adopted to evaluate occupational exposure to noise, other approaches are reported in the scientific literature considered more appropriate to evaluate low frequency noise (LFN), as well as studies testifying the effectiveness of active noise control (ANC) technologies in the low frequency range. In this article, the performance of an ANC system is evaluated in its ability to reduce noise levels inside the soundproof cabin of an agricultural tractor. To test this system, spectro-phonometric measurements of the equivalent linear sound pressure level were conducted under controlled and repeatable engine workloads, obtained by connecting the tractor to a dynamometric brake, while simultaneously acquiring the related engine performance curves. Altogether, three different couples of loudspeakers were tested. Frequency analysis in one-third octave band showed that the ANC system was mainly effective against LFN components (below 120 Hz) with peaks of reduction up to 20 dB. Then, on the basis of indications from previous studies, the data of linear sound pressure levels were processed applying the "A", "B", and "C" weighting filters, to show the different emphasis given to the effects of the system. Eventually, a point-by-point composition of the equivalent levels of sound pressure was drawn over the whole range of the engine, to highlight the conditions in which the ANC system was more effective.
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WATANABE, KEN'ICHI. "Ear noises. II. Ear acoustic emission and ear noise control by a band noise trout car." AUDIOLOGY JAPAN 38, no. 5 (1995): 595–96. http://dx.doi.org/10.4295/audiology.38.595.

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Gabbert, Ulrich, Fabian Duvigneau, and Stefan Ringwelski. "NOISE CONTROL OF VEHICLE DRIVE SYSTEMS." Facta Universitatis, Series: Mechanical Engineering 15, no. 2 (August 2, 2017): 183. http://dx.doi.org/10.22190/fume170615009g.

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The paper presents an overall simulation approach to control the noise emission of car engines at a very early stage of the design process where no real prototypes are available. The suggested approach combines different physical models and couples different software tools such as multi-body analysis, fluid dynamics, structural mechanics, magneto-electrodynamics, thermodynamics, acoustics and control as well. The general overall simulation methodology is presented first. Then, this methodology is applied to a combustion engine in order to improve its acoustical behavior by passive means, such as changing the stiffness and the use of damping materials to build acoustic and thermal encapsulations. The active control by applying piezoelectric patch actuators at the oil sump as the noisiest part of the engine is discussed as well. The sound emission is evaluated by hearing tests and a mathematical prediction model of the human perception. Finally, it is shown that the presented approach can be extended to electric engines, which is demonstrated at a newly developed electric wheel hub motor.
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Akin Ocal, F. C., G. G. Kesici, S. G. Gurgen, R. Ocal, and S. Erbek. "The effect of intratympanic oxytocin treatment on rats exposed to acoustic trauma." Journal of Laryngology & Otology 133, no. 06 (May 17, 2019): 466–76. http://dx.doi.org/10.1017/s0022215119001014.

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AbstractObjectiveTo investigate whether oxytocin can prevent ototoxicity related to acoustic trauma.MethodsTwenty-eight rats were divided into four groups: noise (group 1), control (group 2), noise plus oxytocin (group 3), and oxytocin (group 4). Intratympanic oxytocin was administered on days 1, 2, 4, 6, 8 and 10 in groups 3 and 4. Groups 1 and 3 were exposed to acoustic trauma. Distortion product otoacoustic emission and auditory brainstem response testing were performed in all groups.ResultsIn group 1, auditory brainstem response thresholds increased significantly after acoustic trauma. In group 3, auditory brainstem response thresholds increased significantly on day 1 after acoustic trauma, but there were no significant differences between thresholds at baseline and on the 7th and 21st days. In group 1, significant differences were observed between distortion product otoacoustic emission signal-to-noise ratios measured before and on days 1, 7 and 21 after acoustic trauma. In group 3, no significant differences were observed between the distortion product otoacoustic emission signal-to-noise ratios measured before and on days 7 and 21 after acoustic trauma.ConclusionOxytocin had a therapeutic effect on rats exposed to acoustic trauma in this experiment.
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Barat, Vera, Artem Marchenkov, Dmitry Kritskiy, Vladimir Bardakov, Marina Karpova, Mikhail Kuznetsov, Anastasia Zaprudnova, Sergey Ushanov, and Sergey Elizarov. "Structural Health Monitoring of Walking Dragline Excavator Using Acoustic Emission." Applied Sciences 11, no. 8 (April 11, 2021): 3420. http://dx.doi.org/10.3390/app11083420.

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The article is devoted to the organization of the structural health monitoring of a walking dragline excavator using the acoustic emission (AE) method. Since the dragline excavator under study is a large and noisy industrial facility, preliminary prospecting researches were carried out to conduct effective control by the AE method, including the study of AE sources, AE waveguide, and noise parameters analysis. In addition, AE filtering methods were improved. It is shown that application of the developed filtering algorithms allows to detect AE impulses from cracks and defects against a background noise exceeding the useful signal in amplitude and intensity. Using the proposed solutions in the monitoring of a real dragline excavator during its operation made it possible to identify a crack in one of its elements (weld joint in a dragline back leg).
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Kowalski, K. J., A. J. Brzeziński, J. B. Król, P. Radziszewski, and Ł. Szymański. "Traffic Analysis and Pavement Technology as a Tool for Urban Noise Control." Archives of Civil Engineering 61, no. 4 (December 1, 2015): 107–26. http://dx.doi.org/10.1515/ace-2015-0039.

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Traffic related noise is currently considered as an environmental pollution. Paper presents results of multidirectional study attempting to serve urban traffic without the need to erect noise barriers interfering urban space. Initial concept of the road expansion included construction of 1000 m of noise barriers dividing city space. Improvement in the acoustic conditions after construction completion is possible due to the applied noise protection measures: vehicle speed limit, smooth of traffic flow, use of road pavement of reduced noise emission and the technical improvement of the tramway.
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Chraponska, Anna, Stanislaw Wrona, Jaroslaw Rzepecki, Krzysztof Mazur, and Marek Pawelczyk. "Active Structural Acoustic Control of an Active Casing Placed in a Corner." Applied Sciences 9, no. 6 (March 13, 2019): 1059. http://dx.doi.org/10.3390/app9061059.

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Electric appliances used in workplaces and everyday life often generate a low-frequency noise, which affects human body systems. Passive methods employed to reduce noise are not effective at low frequencies. The classical approach to active noise control practically involves the generation of local zones of quiet, whereas at other areas the noise is reinforced. Moreover, it usually requires a large number of secondary sound sources. Hence, an active casing approach has been developed. The active casing panels’ vibrations are controlled to reduce the device noise emission. Efficiency of this method has been previously confirmed by the authors and the results have been reported in multiple journal publications. However, in the previous research experiments, the active casing was placed at a distance from the enclosure walls. In this research, the active casing is located in a corner and such placement is intentionally used to facilitate the active control system’s operation. The noise reduction performance is investigated at multiple configurations, including a range of distances from the corner and different error microphone arrangements. The analysis of both primary and secondary paths is given. Advantages and drawbacks of different active casing configurations are presented and discussed.
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Seleznev, M. N., and A. Yu Vinogradov. "The application of acoustic emission method for ultrasonic fatigue testing monitoring." Vektor nauki Tol'yattinskogo gosudarstvennogo universiteta, no. 2 (2021): 47–56. http://dx.doi.org/10.18323/2073-5073-2021-2-47-56.

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The ultrasonic fatigue testing (USFT) is an effective method for rapid determination of the fatigue properties of structural materials under high cycle (≥106 cycles) loading. However, the occurrence and accumulation of fatigue damage with this test method remain uncertain due to the limitations of the existing measurement methods. Currently used monitoring methods allow detecting the fatigue cracks, but only in the late stages of failure. Despite the superior sensitivity to localized processes in materials, the use of the acoustic emission (AE) method in ultrasonic testing is extremely difficult due to the presence of resonant noise. This work aimed to suppress resonant noise and extract the signal for early detection of fatigue damage. The authors tested the samples of the AlSi9Cu3 aluminum alloy under the asymmetric cyclic loading (R=0.1) at a resonant frequency of 19.5 kHz with a non-threshold AE registration. The fracture surfaces were analyzed by electron and optical microscopy. The authors processed AE by two different methods: (1) the digital filtering method consisted of detecting resonant noise and removing it from the spectrum; (2) the φ-function method consisted of differentiating the spectrogram by time. The processed spectrograms were integrated by the frequency with further extraction of the AE events using the threshold method. The digital filtering method revealed a correlation between AE signals and fatigue damage, whereas the undamaged control sample showed no signals. The φ-function technique demonstrated ambiguous results, showing high AE activity on the control sample.
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Wang, Zhong, Chang Zheng Chen, and Xiang Jun Kong. "Isolation System Design and Noise Control of Roots Blower Room." Advanced Materials Research 971-973 (June 2014): 1021–24. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1021.

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With the actual case of isolation system design and noise control of roots blower room of a pharmaceutical factory in Shenyang taken into consideration, the overall computation was done on the basis of multi-vibration noise source. The vibration energy of equipments and noise propagation were analyzed both qualitatively and quantitatively with the spectral characteristics of vibration and wideband noise taken into account. Furthermore, the acoustic environment in the blower room was improved and the noise emission of the factory got down to the standard after the vibration isolation and noise reduction measures were applied. This work has important guiding significance and reference value for the projects on vibration isolation and noise control in the future.
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Khorsov, Petr, Nikolay Khorsov, and Vladimir Surzhikov. "Control of Defects on the Parameters of the Electromagnetic Response under Pulsed Mechanical Excitation of the Sample." Advanced Materials Research 1085 (February 2015): 316–18. http://dx.doi.org/10.4028/www.scientific.net/amr.1085.316.

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The paper assessed the possibility of using acoustic emission from the dielectric sample during stepwise loading. The electromagnetic signal from the sample was detected by using an apparatus of mechanical repeatedly pulsed excitation of the sample at each stage of loading. It was found that the response consists of a deterministic component (due to the excitation pulse) and random components noise and acoustic emission. It were allocated random components, calculated their standard deviations. The influence of the electromagnetic emission on standard deviation of the random component of response under step load on the specimen was evaluated. It has been shown that the component of the electromagnetic emission can be an informative parameter to evaluate defectiveness of the object of a dielectric material under load.
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Dissertations / Theses on the topic "Noise control. Tractors Acoustic emission"

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Faber, Benjamin M. "Active minimization of acoustic energy density in a mock tractor cab /." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd375.pdf.

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Boone, Andrew Johnson. "Active minimization of acoustic energy density to attenuate radiated noise from a diesel generator /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1595.pdf.

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Santos, Christian dos. "Investigação dos metodos de determinação de potencia sonora visando programas para etiquetagem de furadeiras eletricas de uso domestico." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258523.

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Orientador: Stelamaris Rolla Bertoli
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Made available in DSpace on 2018-08-05T23:46:28Z (GMT). No. of bitstreams: 1 Santos_Christiandos_M.pdf: 3511506 bytes, checksum: d365f6dc71d5566b93533834923018e0 (MD5) Previous issue date: 2004
Resumo: A existência de fenômenos acústicos depende de três fatores: a fonte, o meio e o receptor. Para a prevenção de condições ruidosas em certos ambientes, é necessário o conhecimento de uma característica própria da fonte que não sofre interferência do meio na propagação da energia sonora, como é o caso da potência sonora. O IBAMA em conjunto com o INMETRO iniciou um programa que visa informar e minimizar o ruído (nível de potência sonora) produzido por aparelhos elétricos etiquetando-os. Este programa se chama Selo Ruído. Existe uma previsão de inclusão de ferramentas elétricas neste programa de etiquetagem. A furadeira elétrica é uma destas ferramentas que tem inclusão prevista. Com o intuito de investigar os métodos de ensaio para determinação de potência sonora, este trabalho propõe a realização de ensaios de diversos métodos normalizados de determinação de nível de potencia sonora aplicando-os para furadeiras elétricas. Os métodos escolhidos para os ensaios foram os que utilizam salas reverberantes especiais (ISO 3743 ¿ Engineering Methods for Special Reverberations test Rooms e ISO 3741 ¿ Precision Methods for Special Reverberations test Rooms). Estes métodos são referenciados na norma nacional NBR 13910:1997-Parte 1- Diretrizes de ensaios para a determinação de ruído acústico de aparelhos eletrodomésticos e similares. Com os resultados obtidos dos ensaios realizados, foi feita uma análise de qualificação das metodologias empregadas. A partir de cada item destas metodologias foi analisada a aplicabilidade destes itens a ser empregado no método de ensaio proposto. A construção das etapas do método foi obtida a partir dos itens qualificados e aplicáveis ao programa de etiquetagem Selo Ruído
Abstract: In the acoustic phenomena there are three main variables: the source, the medium and the receptor. For the prevention of noise conditions in certain places, it is necessary to know a source characteristic that does not change with medium variations. This characteristic is the sound power radiated by the source. To consider this prevention, IBAMA and INMETRO started a program that labels the household appliances according to the noise level emitted by them. This program is called ¿Selo Ruído¿. There is a prevision to include the electric tools in this label program. The drill is one of these electric tools that will be included. To investigate the methods for determination of the sound power levels, this work proposes some tests of drills in several standarded methods. The methods used for the tests were the ones that use reverberation rooms (ISO 3743 ¿ Engineering Methods for Special Reverberations test Rooms and ISO 3741 ¿ Precision Methods for Special Reverberations test Rooms). These methods are referenced at the Brazilian standard NBR 13910:1997 ¿ Part 1 ¿ ¿Diretrizes de ensaios para a determinação de ruído acústico de aparelhos eletrodomésticos e similares¿. A qualification analysis of the methodologies applied was done, based on the tests results. An application of these items was done from each item of these methodologies in the test method proposed. The construction of the steps in the proposed method was made from the items qualified and applied to the ¿Selo Ruído¿ program
Mestrado
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Mestre em Engenharia Civil
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Books on the topic "Noise control. Tractors Acoustic emission"

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N.Y.) ASME Noise Control and Acoustics Division Conference (2012 New York. Proceedings of the ASME Noise Control and Acoustics Division Confererence, 2012: Presented at Internoise/ASME 2012 Noise Control and Acoustics Division Conference, August 19-22, 2012, New York, New York, USA. New York, N.Y: ASME, 2012.

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NoiseCon/ASME, NCAD (2008 Dearborn Mich ). Proceedings of NoiseCon/ASME NCAD --2008: Presented at NoiseCon2008/ASME NCAD July 28-30, 2008 Dearborn, Michigan USA. New York, N.Y: ASME, 2009.

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NoiseCon/ASME NCAD (2008 Dearborn, Mich.). Proceedings of NoiseCon/ASME NCAD --2008: Presented at NoiseCon2008/ASME NCAD July 28-30, 2008 Dearborn, Michigan USA. New York, N.Y: ASME, 2009.

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Blake, William K., Denis Lynch, Robert P. Dougherty, Paul T. Soderman, James R. Underbrink, and Christopher S. Allen. Aeroacoustic Measurements. Springer, 2002.

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Pollack, M. L. The Asme Noise Control and Acoustics Division. American Society of Mechanical Engineers, 2000.

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Proceedings of the ASME noise control and acoustics division 2004: Active noise control, aero/hydro acoustincs, structural acoustics : presented at 2004 ASME International Mechanical Engineering Congress and Exposition, November 13-19, 2004 .. United States: ASME, 2004.

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L, Pollack Martin, Marboe Richard C, American Society of Mechanical Engineers. Noise Control and Acoustics Division., and International Mechanical Engineering Congress and Exposition (2000 : Orlando, Florida), eds. Proceedings of the ASME Noise Control and Acoustics Division--2000: Presented at the 2000 ASME International Mechanical Engineering Congress and Exposition : November 5-10, 2000, Orlando, Florida. New York, New York: American Society of Mechanical Engineers, 2000.

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C, Marboe Richard, Grace Sheryl M, American Society of Mechanical Engineers. Noise Control and Acoustics Division., and International Mechanical Engineering Congress and Exposition (2002 : New Orleans, La.), eds. Proceedings of the ASME Noise Control and Acoustics Division--2002: Presented at the 2002 ASME International Mechanical Engineering Congress and Exposition : November 17-22, 2002, New Orleans, Louisiana. New York, New York: American Society of Mechanical Engineers, 2002.

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American Society of Mechanical Engineers. Noise Control and Acoustics Division. and International Mechanical Engineering Congress and Exposition (2004 : Anaheim, Calif.), eds. Proceedings of the ASME Noise Control and Acoustics Division--2004: Presented at 2004 ASME International Mechanical Engineering Congress and Exposition : November 13-19, 2004, Anaheim, California, USA. New York, N.Y: ASME, 2004.

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Ga.) International Mechanical Engineering Congress and Exposition (1996 : Atlanta. Proceedings of the Asme Noise Control and Acoustics Division: Presented at the 1998 Asme International Mechanical Engineering Congress and Exposition : ... Anaheim, California (Nca (Series), Vol. 25.). Amer Society of Mechanical, 1998.

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Conference papers on the topic "Noise control. Tractors Acoustic emission"

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Mohammad, W. N. A. W., M. N. K. H. Rohani, N. F. Rosle, K. N. Khalid, A. S. Rosmi, A. Z. Abdullah, and M. K. M. Jamil. "Analysis on Multiple Acoustic and Electrical Emission of PD Signal Based on Signal to Noise Ratio (SNR) on Power Cable." In 2020 IEEE 8th Conference on Systems, Process and Control (ICSPC). IEEE, 2020. http://dx.doi.org/10.1109/icspc50992.2020.9305756.

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Mohammad, W. N. A. W., M. N. K. H. Rohani, N. F. Rosle, K. N. Khalid, A. S. Rosmi, A. Z. Abdullah, and M. K. M. Jamil. "Analysis on Multiple Acoustic and Electrical Emission of PD Signal Based on Signal to Noise Ratio (SNR) on Power Cable." In 2020 IEEE 8th Conference on Systems, Process and Control (ICSPC). IEEE, 2020. http://dx.doi.org/10.1109/icspc50992.2020.9305756.

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Butera, Frank, and Keith Hewett. "Acoustic Performance of Louvred Facades for Brisbane Domestic Airport: An Integrated Approach." In ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ncad2012-1393.

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Maximising cross ventilation is a low energy method of naturally ventilating and providing heating and cooling to deep plan spaces. Significant reduction in the emission of greenhouse gases can be achieved through minimising the use of mechanical systems in regions with climatic conditions that support the use of natural ventilation. Arup has provided input into the design of a louvered facade for the control of external noise for Brisbane Domestic Airport. A full scale prototype facade was constructed and noise transmission loss measurements were undertaken. The results indicate that significant noise reduction can be achieved to enable compliance with the internal noise limits for airport terminals, whilst using natural ventilation. The findings from this research will directly benefit building designers and innovators in the pursuit of achieving sustainable building design.
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Ponti, F., V. Ravaglioli, and M. De Cesare. "Real-Time Processing of Engine Acoustic Emission for Diesel Injectors Diagnostic and Recentering." In ASME 2017 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icef2017-3568.

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Diesel engine control strategies use complex injection patterns which are designed to meet the increasing request for engine-out emissions and fuel consumption reduction. As a result of the large number of tuneable injection parameters in modern injection systems (such as start and duration of each injection), injection patterns can be designed with many degrees of freedom. Each variation of the injection parameters modifies the whole combustion process and, consequently, engine-out emissions. Aging of the injection system usually affects injection location within the cycle as well as the amount of injected fuel (compared to the target value), especially for small pre-injections. Since Diesel combustion is very sensitive to injection pattern variations, aging of injectors strongly affects engine behavior, both in terms of efficiency and pollutant emissions production. Moreover, such variations greatly affect other quantities related to the effectiveness of the combustion process, such as noise radiated by the engine. This work analyses the effects of pre-injection variations on combustion, pollutant emissions and noise radiated by the engine. In particular, several experimental tests were run on a 1.3L Common Rail Diesel engine varying the amount of fuel injected in pre-injections. Torque delivered by the engine and center of combustion (MFB50) were kept constant using a specifically designed closed-loop combustion controller. During the tests, noise radiated by the engine was measured by properly processing the signal coming from a microphone faced to the engine block. The investigation of the correlation between the combustion process and engine noise can be used to set up a closed-loop algorithm for detecting and recentering injectors’ drifts over time.
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Woo, Sangbeom, Xinran Zhao, Andrea Vacca, and Manuel Rigosi. "A Model-Based Comparative Investigation on the Noise Source of Hydraulic Gear Pumps." In ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4326.

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The reduction of the noise emission level of hydraulic pumps has been a primary research goal in the fluid power field for decades. To pursue this goal, a significant effort has been put in identifying the sources of noise generation, and formulating proper methods to reduce them. Most common methods include the analysis of the kinematic features of the displacing action realized by the unit, and/or the pressure fluctuation at the pump ports. However, the physical complexity associated with the noise transmission into the pump structure and the surrounding environment has not permitted so far to achieve clear correlations between fluid-borne noise sources and actual emitted noise. Recently, the advancement in numerical acoustic modelling techniques has permitted to explore these features, so that in future, quieter units could be designed with the help from simulation. This paper contributes in this topic, considering as a particular reference unit, the case of external gear pumps. An acoustic model developed by the authors’ research group permits to perform analysis of both structure- and air-borne noise, by combining a modal analysis performed in ANSYS and an acoustic simulation in LMS.Virtual.Lab. As pressure and force loading inputs, the model utilizes the results of the authors’ HYGESim tool. To show the model’s potentials, the paper takes into considerations two alternative gear designs suitable for the same pump casing: one single flank and one dual flank (zero-backlash). The dual-flank design is commonly considered as a quieter solution for spur gear pumps. These designs are properly selected to show differences in fluid-borne noise source, and describes the features of the noise transmission as predicted by the model. By showing the simulated level of airborne noise for the two considered designs, the results of this paper confirm the advantages of the dual-flank solution, and point out how the proposed model can be used in future for virtual design purposes.
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Siller, Henri A. "Localisation of Sound Sources on Aircraft in Flight." In ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ncad2012-0575.

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This paper presents beamforming techniques for source localization on aicraft in flight with a focus on the development at DLR in Germany. Fly-over tests with phased arrays are the only way to localize and analyze the different aerodynamic and engine sources of aircraft in flight. Many of these sources cannot be simulated numerically or in wind-tunnel tests because they they are either unknown or they cannot be resolved properly in model scale. The localization of sound sources on aircraft in flight is performed using large microphone arrays. For the data analysis, the source signals at emission time are reconstructed from the Doppler-shifted microphone data using the measured flight trajectory. Standard beamforming techniques in the frequency domain cannot be applied due transitory nature of the signals, so the data is usually analyzed using a classical beamforming algorithm in the time domain. The spatial resolution and the dynamic range of the source maps can be improved by calculating a deconvolution of the sound source maps with the point spread function of the microphone array. This compensates the imaging properties of the microphone array by eliminating side lobes and aliases. While classical beamfoming yields results that are more qualitative by nature, the deconvolution results can be used to integrate the acoustic power over the different source regions in order to obtain the powers of each source. ranking of the sources. These results can be used to rank the sources, for acoustic trouble shooting, and to assess the potential of noise abatement methods.
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Sarigul-Klijn, Nesrin, Brian C. Kuo, and Dean C. Karnopp. "Deployable Micro-Tabs in Aircraft Noise Control Near Airports: Scaled Experimental Apparatus and Computational Results." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43175.

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Reducing acoustic noise emission of commercial aircraft is of great interest to communities near airport. It is well recognized that the aircraft noise during the landing approach is mostly due to use of high lift devices. In this paper, in-flight deployable micro-tab devices are investigated for their suitability in aircraft landing nose control. This is accomplished with the use of the virtual-reality after scaled testing-simulation-validations approach. A scaled testing apparatus had to be designed to capture non-propulsive noise from aircraft during approach to validate the results of computational scaled simulation. This apparatus now serves as an anechoic wind tunnel at low Mach numbers and its design is detailed. We proposed use of lift generating micro-tab device that will allow reduced slat and/or flap settings during the approach thereby causing a reduction in airframe noise. Simulations based on a 1/3rd scaled B737 wing resulted in promising noise reductions for the case with deployed micro-tab.
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Doria, Alberto, Paolo Florian, and Floriano Franzon. "Noise Control in a Small Household Appliance by Means of Experimental Analysis of Vibration Paths." 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/detc2015-46509.

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Automatic machines for the preparation of coffee from the bean to the cup have now a wide diffusion among coffee amateurs. Since these machines are usually installed at home and in offices, low noise emission is an important design requirement. These small appliances are complex dynamic systems from the point of view of noise and vibration control, because they include some electric motors, a transmission, a grinder, some mechanisms, a suspension system, cavities and radiating panels. In the last decades various methods for the experimental study of vibrations have been developed in the aerospace and automotive fields, like transfer path analysis and modal testing. The first section of this paper describes the potentialities and the limits of these methods, when a small appliance (maximum size 300 mm) has to be tested in an industrial environment. Then a specific method for the study of the flux of energy from the motor-grinder group to the acoustic field is presented. It is based on the physical variation in the stiffness of the resilient connections, which is carried out with the design of experiments approach. The noise spectra measured outside the machine and the vibration spectra measured in critical points inside the machine are analyzed with correlation techniques. Results show that the resilient mounts are effective, but one transmission path influences noise transmission more than the others, mainly owing to the asymmetrical construction of the motor-grinder group and of the appliance structure. Suggestions for improved noise control are given.
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9

Schleihs, Christian, and Hubertus Murrenhoff. "Acoustical Simulation of a Hydraulic Swash Plate Motor." In ASME/BATH 2015 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fpmc2015-9523.

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During the past decade tightened safety and health regulations concerning noise pollution in the work place have led to an increased importance of acoustic emissions in machinery. In the course of widespread R&D efforts internal combustion engines have received much attention, leading to their optimization and therefore to a higher contribution of hydraulic components, especially pumps and motors, to the overall machinery sound level. However, hydraulic industrial design engineering has only recently begun to take acoustic issues into account at an early design stage. This may be due to the situation that the simulation of sound radiation of complex (hydraulic) machinery is not yet as far developed as other finite element analysis (FEA) fields. In order to improve the sound emission of a variable displacement hydraulic swash plate motor, this paper deals with its acoustic simulation. Therefore an acoustic FEA model is presented. This paper mainly addresses the simulation model setup, the derivation of the resulting dynamic loads and the acoustic analysis, which includes the calculation of the surrounding acoustical near and far field. The simulated sound pressure levels are compared with experimental sound measurements conducted on the motor. Additionally, the influence of different valve plate designs is analyzed.
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10

Tan, Oui Hong, Steven John Wilcox, and John Ward. "The Development of a Monitoring and Control System for Pulverised Coal Flames Using Artificial Intelligence Techniques." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85018.

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This paper discusses the application of low cost sensors for monitoring pulverised coal flames. A series of burner diagnostics tests using Infra-red (IR), Microphone and Acoustic Emission (AE) sensors were conducted on a 150 kW pulverised fuel (pf) burner rig based at Casella CRE Ltd. in the United Kingdom. These experiments systematically varied the burner swirl number and the secondary airflow rate over a significant range for two different coals so that both satisfactory and ‘poor’ combustion conditions were obtained. The infra-red radiation from the flame, the combustion noise and the acoustic emission generated in the burner body were measured, as were the fuel and airflow rates and pollutant emissions. The signals from the sensors were analysed by using signal processing techniques to reveal a number of features. These in turn were compared with the three major combustion gases such as Nitrogen Oxides (NOx), Carbon monoxide (CO) and Oxygen (O2) followed by correlation coefficient analysis (CCA). It is envisaged that these sensors can be used for predicting gaseous emissions and will be particularly attractive for multiple burner installations where the pollutant emissions are often discharged through a common manifold, so that the individual burner performance is often not known and cannot be optimised.
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