Готові списки джерел за темами / Mechanical noise

Добірка наукової літератури з теми "Mechanical noise"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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Статті в журналах з теми "Mechanical noise"

Tapia-Rojo, Rafael, Álvaro Alonso-Caballero, and Julio M. Fernández. "Talin folding as the tuning fork of cellular mechanotransduction." Proceedings of the National Academy of Sciences 117, no. 35 (August 17, 2020): 21346–53. http://dx.doi.org/10.1073/pnas.2004091117.

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Cells continually sample their mechanical environment using exquisite force sensors such as talin, whose folding status triggers mechanotransduction pathways by recruiting binding partners. Mechanical signals in biology change quickly over time and are often embedded in noise; however, the mechanics of force-sensing proteins have only been tested using simple force protocols, such as constant or ramped forces. Here, using our magnetic tape head tweezers design, we measure the folding dynamics of single talin proteins in response to external mechanical noise and cyclic force perturbations. Our experiments demonstrate that talin filters out external mechanical noise but detects periodic force signals over a finely tuned frequency range. Hence, talin operates as a mechanical band-pass filter, able to read and interpret frequency-dependent mechanical information through its folding dynamics. We describe our observations in the context of stochastic resonance, which we propose as a mechanism by which mechanosensing proteins could respond accurately to force signals in the naturally noisy biological environment.

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Camossi, Roberto. "Mechanical low‐noise press." Journal of the Acoustical Society of America 93, no. 6 (June 1993): 3536–37. http://dx.doi.org/10.1121/1.405370.

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Koss, L. L., and W. Kowalczyk. "Punch press mechanical clutch engagement noise and noise reduction." Journal of Sound and Vibration 102, no. 4 (October 1985): 527–49. http://dx.doi.org/10.1016/s0022-460x(85)80112-7.

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Lilly, Jerry G. "Mechanical noise and vibration control." Journal of the Acoustical Society of America 150, no. 4 (October 2021): A23. http://dx.doi.org/10.1121/10.0007495.

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Keefe, Joseph. "Mechanical noise control case studies." Journal of the Acoustical Society of America 150, no. 4 (October 2021): A137. http://dx.doi.org/10.1121/10.0007895.

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Allardet-Servent, Jérôme. "Adding noise to mechanical ventilation." Critical Care Medicine 40, no. 9 (September 2012): 2725–26. http://dx.doi.org/10.1097/ccm.0b013e31825bc827.

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Sevier, Stuart A., David A. Kessler, and Herbert Levine. "Mechanical bounds to transcriptional noise." Proceedings of the National Academy of Sciences 113, no. 49 (November 22, 2016): 13983–88. http://dx.doi.org/10.1073/pnas.1612651113.

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Over the past several decades it has been increasingly recognized that stochastic processes play a central role in transcription. Although many stochastic effects have been explained, the source of transcriptional bursting (one of the most well-known sources of stochasticity) has continued to evade understanding. Recent results have pointed to mechanical feedback as the source of transcriptional bursting, but a reconciliation of this perspective with preexisting views of transcriptional regulation is lacking. In this article, we present a simple phenomenological model that is able to incorporate the traditional view of gene expression within a framework with mechanical limits to transcription. By introducing a simple competition between mechanical arrest and relaxation copy number probability distributions collapse onto a shared universal curve under shifting and rescaling and a lower limit of intrinsic noise for any mean expression level is found.

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Saulson, Peter R. "Thermal noise in mechanical experiments." Physical Review D 42, no. 8 (October 15, 1990): 2437–45. http://dx.doi.org/10.1103/physrevd.42.2437.

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Tikriti, Walid. "Pool equipment mechanical noise impact." Journal of the Acoustical Society of America 141, no. 5 (May 2017): 3686. http://dx.doi.org/10.1121/1.4988018.

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Fahey, S. O., and A. L. Wicks. "NOISE SOURCES IN MECHANICAL MEASUREMENTS." Experimental Techniques 24, no. 2 (March 2000): 40–43. http://dx.doi.org/10.1111/j.1747-1567.2000.tb02271.x.

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Дисертації з теми "Mechanical noise"

Mow-Lowry, Conor. "Opto-mechanical noise cancellation." View electronic text, 2002. http://eprints.anu.edu.au/documents/disk0/00/00/07/65/index.html.

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Thesis (BSc. (Hons))--Australian National University, 2002.
Available via the Australian National University Library Electronic Pre and Post Print Repository. Title from title screen (viewed Mar. 28, 2003). "A thesis submitted for the degree of Bachelor of Science with Honours in physics at the Australian National University" "November 2002" Bibliography: p. 73-75.

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Copley-Woods, Djuna S. (Djuna Sunlight) 1977. "Aircraft interior acoustic noise control." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9330.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
Includes bibliographical references (p. 45).
An experimental study was perfonned to determine which materials are best suited for internal aircraft noise reduction. An impedance tube with dimensions of a scaled aircraft was constructed and evaluated, and eleven materials were tested and compared based on their noise reduction properties, weight, and thickness. Polyvinylidene Fluoride was tested for use in active noise control for a large space.
by Djuna S. Copley-Woods.
S.B.

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Qiu, Jin 1974. "Modeling of plate impact dynamics and noise." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80514.

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Louie, Lisa Lai Yee. "Active control of pipe-borne pump noise." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13267.

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Mahmud, Akib. "Digital Compensation of Phase Noise Caused by Mechanical Vibrations." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-387826.

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The component that generates the frequency of the radio waves transmitted by a radar is generally built around a quartz crystal oscillator. When this component is exposed to mechanical vibrations, such as acceleration or rotation in different directions, phase noise occurs. That is due to the piezoelectric effect of quartz crystals, which eventually degrades the performance of a radar. High frequency noise are compensated for using mechanical dampers. However, the low frequency noise remains and requires a digital solution. To solve this, a theoretical compensation model for the quartz crystal has been designed. It was possible to measure the noise generated by the quartz crystal by utilising an accelerometer, perform simulations and calculations. With the help of these different tools, it was possible to theoretically calculate and reduce the phase noise by 30-40%. All the results that has been obtained are theoretical results and nothing has yet been implemented in any radar system.

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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 simulation results, the noise reduction effect of the secondary sound source on the computer case is obtained. This paper can provide a scientific reference for the manufacture of computer chassis and improvement of noise.

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Chiasson, Leo E. Jr. "Radiated noise from a three dimensional truss." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36058.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
Includes bibliographical references (leaves 83-84).
by Leo E. Chiasson, Jr.
M.S.

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Ingemanson, Megan Lynn. "Experimental Characterization of Wind Turbine Blade Aerodynamic Noise." Thesis, University of California, Davis, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1539643.

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Wind turbine noise at low frequencies less than 300Hz is not only annoying to humans but has been proven to cause serious health issues. Additionally, animals are severely affected by wind turbines because a small increase in ambient noise (as is produced by wind turbines) significantly reduces their listening ability. In an attempt to better understand and characterize the aerodynamic noise of wind turbine blades, experimental testing was completed on PowerWorks 100kW and GudCraft WG700 blade specimens in the University of California, Davis Transportation Noise Control Center's anechoic chamber. Experimental testing and data analysis proved approximately 4.0dB to 6.0dB was produced due to the blades' geometric design for both blade specimens at low frequencies. This noise was maximized at the blades' leading edge along the central portion of the blades' radius. Theoretical prediction models have been used to determine that, for typical wind speeds and low frequencies, noise generated due to the tip passing frequency is clearly predominant.

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Hong, Seung Hyuck. "Active noise control of supersonic impinging jet using pulsed microjets." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/46637.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.
Includes bibliographical references (leaves 111-113).
This thesis concerns an active noise control of supersonic impinging jet flow using unsteady microjet injection. Supersonic impinging jet involves several problems such as lift loss, ground erosion, significant noise pollution, and sonic fatigue, all of which are dominated by impinging tones mainly caused by well-known phenomenon, the feed back loop. The main goal of this study is to achieve uniform and consistent noise reduction in the entire range of jet operating condition, by means of intercepting this feed back loop. Experimental investigations on ideally expanded Mach number 1.5, supersonic impinging jet flow were carried out at the scaled supersonic experimental facility. The actuator used for active control is composed of pulsed microjets, utilizing a fraction of mass flow rate needed with steady microjets. Two means of producing pulsed microjet were introduced; one with a rotating cap, pulsing at 16 - 100Hz, and the other developed based on the principle of Hartmann tube, pulsing at 4.4 - 6.1kHz, referred to as high frequency actuator. Control parameters related to pulsed microjet injection with rotating cap were varied to evaluate their effects on suppression of impinging tones, whereas the effect of high frequency actuator is shown only as an initial step and needs further investigation in the future. For pulsed microjet with rotating cap, mass flow rate, directly proportional to the supply pressure of microjet, is found to be the most important parameter amongst all and saturated supply pressures for steady and pulsed microjet are demonstrated. It is demonstrated that pulsed microjet gives more noise reduction than steady microjet with the same mass flow rate, at certain range of supply pressure, and also that pulsed microjet could be as effective on suppression of impinging tones as steady microjet with less mass flow rate. In addition, the effect of pulsed microjet on hot temperature impinging jet was examined since the jet is much hotter than ambient air in reality. The concept of extremum control strategy is introduced to more efficiently find an optimal pulsing condition for uniform and consistent noise reduction.
by Seung Hyuck Hong.
S.M.

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Oppenheimer, Charles Hugh. "Impact-induced noise and vibration in machine systems for design." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12614.

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Книги з теми "Mechanical noise"

Foreman, John E. K. Sound Analysis and Noise Control. Boston, MA: Springer US, 1991.

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Townsend-Manning, Mary. Analysis of central Arctic noise events. Springfield, Va: Available from the National Technical Information Service, 1987.

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Conference on Mechanical Vibration and Noise (18th 2001 Pittsburgh, Pa.). 18th Biennial Conference on Mechanical Vibration and Noise. New York: American Society of Mechanical Engineers, 2001.

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Conference on Mechanical Vibration and Noise (18th 2001 Pittsburgh, Pa.). 18th Biennial Conference on Mechanical Vibration and Noise. New York: American Society of Mechanical Engineers, 2001.

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Oswald, Fred B. Effect of operating conditions on gearbox noise. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1992.

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Mechanical sound: Technology, culture, and public problems of noise in the twentieth century. Cambridge, Mass: MIT Press, 2008.

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1960-, Bell Douglas H., ed. Industrial noise control: Fundamentals and applications. 2nd ed. New York: M. Dekker, 1994.

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Conference on Mechanical Vibration and Noise (11th 1987 Boston, Mass.). Mechanical signature analysis: Machinery vibration, flow-induced vibration, and acoustic noise analysis. New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1987.

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Möser, Michael. Engineering Acoustics: An Introduction to Noise Control. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004.

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Ramsey, James R. Architectural, building, and mechanical systems acoustics: A guide to technical literature. LaCrosse, WI, U.S.A: R/T Books, 1986.

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Частини книг з теми "Mechanical noise"

Morello, Lorenzo, Lorenzo Rosti Rossini, Giuseppe Pia, and Andrea Tonoli. "Noise, Vibration, Harshness." In Mechanical Engineering Series, 239–363. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0516-6_5.

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Diehl, George M. "Noise Measurement and Control." In Mechanical Engineers' Handbook, 1230–52. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/0471777447.ch35.

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Maurya, Rakesh Kumar. "Knocking and Combustion Noise Analysis." In Mechanical Engineering Series, 461–542. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11954-6_9.

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LAPINI, Alessandro, Massimiliano BIAGINI, Francesco BORCHI, Monica CARFAGNI, and Fabrizio ARGENTI. "Design of Active Noise Control Systems for Pulse Noise." In Lecture Notes in Mechanical Engineering, 621–30. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45781-9_62.

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Nogueira Ribeiro, Lucas, João César Moura Mota, Didier Le Ruyet, and Eduardo Souza de Cursi. "Noise, Channel and Message Identification on MIMO Channels with General Noise." In Lecture Notes in Mechanical Engineering, 285–305. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53669-5_21.

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Cleland, Andrew N. "Dissipation and Noise in Mechanical Systems." In Advanced Texts in Physics, 277–301. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05287-7_8.

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Buttarazzi, Massimo Generoso, Chiara Bartalucci, Francesco Borchi, Monica Carfagni, and Libero Paolucci. "Analysis of Possible Algorithms for Active Noise Control of Siren Noise into an Ambulance." In Lecture Notes in Mechanical Engineering, 630–40. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91234-5_63.

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Chen, Yong. "Automobile and Transmission Vibration and Noise." In Springer Tracts in Mechanical Engineering, 533–70. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6703-2_13.

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Dogra, Sourabh, and Arpan Gupta. "Low-Frequency Noise Control in Ducts." In Lecture Notes in Mechanical Engineering, 527–35. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6738-1_43.

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Tong, Wei. "Motor Vibration and Acoustic Noise." In Mechanical Design and Manufacturing of Electric Motors, 697–774. 2nd ed. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003097716-12.

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Тези доповідей конференцій з теми "Mechanical noise"

Huang, S., and C. Béguier. "Aerodynamic Noise Calculation of a Detaching Flow." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0080.

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Abstract A numerical study based on the macro-simulation method is carried out in order to determine the aerodynamical noise of a turbulent detaching flow. The macro-simulation method uses a Large Eddy Simulation (LES) code to obtain at the same time, the large structures of the flow and the small structures modelled by a sub-grid eddy viscosity, and an acoustic code able to calculate, in the far field, the radiated aerodynamical noises, from the Lighthill-Curle formalism. The method permits to dissociate the different aerodynamical noises: the wall noise, due to the wall-pressure fluctuations, the shear noise, due to the large scale quadrupole sources, and the turbulence self noise, generated by the small scale quadrupole sources. The case of the normal backward facing step is presented, for which the different emitted noises are analysed and compared together. Some theoretical hypotheses are also tested.

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Green, Itzhak. "Mechanical Face Seal Dynamics Subjected to Machine Vibration and Noise." In ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-91006.

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Abstract Mechanical face seals are wide-spread in many applications, such as centrifugal compressors, submersible pumps, drill-bits for oil and water, hydrocarbon processing equipment, and turbomachinery. Often vibration and noise are unavoidable because of changing environments which can be persistent and forceful. In critical applications when seals fail, they may have significant or even catastrophic consequences. To ensure the safety of such machinery and its associated mechanical components, the vibration and noise must be diagnosed and kept within certain limits. This work focuses on the dynamics of a flexibly mounted stator mechanical face seal that is subjected to combinations of axial broad-band noisy vibrations of the shaft and the housing. The current analysis builds upon the dynamic models that have been developed over the last four decades. In all that body of work, the positions of the housing and the shaft have been considered fixed. The current work relaxes that condition, augmenting the equations of motion to incorporate the said noisy vibrations. While the exact root-causes and sources of machinery vibration are very difficult to ascertain, the current analysis uses some general common causes of noisy seal operation, and provides markers to be observed for diagnosis. While the forcing noises are assumed to originate along the main axis of the seal, because of the strong coupling between the axial and angular modes, the seal is affected (even strongly) in all modes (axial and angular). A numerical simulation ensues, and the results are subject to spectral analyses. Results show that under some design conditions, the seal is largely insensitive to machine vibrations. However, under other design parameters, the seal response exhibits a rich spectral content that stems from various transient phenomena that include (among others) half frequency whirl, synchronous steady-state response, and the natural (eigen) response. Under aggravated noisy conditions the investigated seal exhibits large oscillations and leakage, along with face contact and rubbing. Prolonged rubbing causes faces to wear and leads ultimately to seal failure.

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Holehouse, Robert, Annabel Shahaj, Melanie Michon, and Barry James. "Integrated Approach to Electro-Mechanical System NVH Analysis." In 10th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2018. http://dx.doi.org/10.4271/2018-01-1499.

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Saha, Pranab. "Mechanical Impedance Based Vibration Damping Test." In Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2017. http://dx.doi.org/10.4271/2017-01-1879.

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Machens, Kai-Ulrich, and Jens Scholz. "Mechanical Retractor Noise Evaluation on Electrodynamic Shaker: Test Procedure." In 10th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2018. http://dx.doi.org/10.4271/2018-01-1532.

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Kolluru, Yashwant, Rolando Doelling, and Lars Hedrich. "Multi Domain Modeling of NVH for Electro-Mechanical Drives." In 11th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2020. http://dx.doi.org/10.4271/2020-01-1584.

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

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Abstract A passive noise control technique for the flow-induced noise using a porous material was studied experimentally. The purpose of this study was to decrease the aerodynamic sound using porous material that permeated only sound and clarify that reduction mechanism. In the experiment, flow-induced noises emitted from two types of rectangular cylinders was measured in a low-noise wind tunnel. One cylinder was made of four aluminum plates and the other was two aluminum and porous material plates each. Measurement results show that the frequency of the distinct tonal noise was different between two cylinders, that frequency was higher for using porous material. It was also found that the sound pressure level of the noise was also different and that of the cylinder using porous material plate was 25 dB smaller at maximum. Velocity field of the wake of cylinders were examined by the PIV measurement and that showed that time and space scale of separated vortices around cylinder were smaller for using porous material. It is assumed that the change of aerodynamic sound was caused by that change in velocity field.

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Di Paola, M., та M. Vasta. "Non Linear Systems Under Complex α-Stable Le´vy White Noise". У ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55469.

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The problem of predicting the response of linear and nonlinear systems under Le´vy white noises is examined. A method of analysis is proposed based on the observation that these processes have impulsive character, so that the methods already used for Poisson white noise or normal white noise may be also recast for Le´vy white noises. Since both the input and output processes have no moments of order two and higher, the response is here evaluated in terms of characteristic function.

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van der Linden, P. J. G., and J. K. Fun. "Using Mechanical-Acoustic Reciprocity for Diagnosis of Structure Borne Sound in Vehicles." In Noise & Vibration Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1993. http://dx.doi.org/10.4271/931340.

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Fantini, Paolo. "Low Frequency Noise sensitivity to technology induced mechanical stress in MOSFETs." In NOISE AND FLUCTUATIONS: 18th International Conference on Noise and Fluctuations - ICNF 2005. AIP, 2005. http://dx.doi.org/10.1063/1.2036729.

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Звіти організацій з теми "Mechanical noise"

Camparo, J. C., and P. Lambropoulos. Quantum-Mechanical Interference Between Optical Transitions: The Effect of Laser Intensity Noise. Fort Belvoir, VA: Defense Technical Information Center, May 1999. http://dx.doi.org/10.21236/ada363838.

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Damiano, B., E. D. Blakeman, and L. D. Phillips. Detection and location of mechanical system degradation by using detector signal noise data. Office of Scientific and Technical Information (OSTI), June 1994. http://dx.doi.org/10.2172/10158070.

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Damiano, B. Detection and Location of Mechanical System Degradation by Using Detector Signal Noise Data. Office of Scientific and Technical Information (OSTI), January 1994. http://dx.doi.org/10.2172/814043.

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Whitecloud, Simone, Holly VerMeulen, Franz Lichtner, Nadia Podpora, Timothy Cooke, Christopher Williams, Michael Musty, Irene MacAllister, and Jason Dorvee. Understanding plant volatiles for environmental awareness : chemical composition in response to natural light cycles and wounding. Engineer Research and Development Center (U.S.), November 2022. http://dx.doi.org/10.21079/11681/45961.

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Plants emit a bouquet of volatile organic compounds (VOCs) in response to both biotic and abiotic stresses and, simultaneously, eavesdrop on emit-ted signals to activate direct and indirect defenses. By gaining even a slight insight into the semantics of interplant communications, a unique aware-ness of the operational environment may be obtainable (e.g., knowledge of a disturbance within). In this effort, we used five species of plants, Arabidopsis thaliana, Panicum virgatum, Festuca rubra, Tradescantia zebrina, and Achillea millefolium, to produce and query VOCs emitted in response to mechanical wounding and light cycles. These plants provide a basis for further investigation in this communication system as they span model organisms, common house plants, and Arctic plants. The VOC com-position was complex; our parameter filtering often enabled us to reduce the noise to fewer than 50 compounds emitted over minutes to hours in a day. We were able to detect and measure the plant response through two analytical methods. This report documents the methods used, the data collected, and the analyses performed on the VOCs to determine if they can be used to increase environmental awareness of the battlespace.

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Noise Absorption Behavior of Aluminum Honeycomb Composite. SAE International, September 2020. http://dx.doi.org/10.4271/2020-28-0453.

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Natural fibers are one of the major ways to improve environmental pollution. In this study experimental investigation and simulation of honeycomb filled with cotton fabric, wood dust and polyurethane were carried out. This study determines the potential use of cotton fabric, wood dust as good sound absorbers. Automotive industries are looking forward to materials that have good acoustic properties, lightweight, strong and economical. This study provides a better understanding of sound-absorbing material with other mechanical properties. With simulation and experimental results, validation of works provides a wider industrial application for the interior of automotive industries including marine, aviation, railway industry and many more.

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POWER FLOW ANALYSIS OF BRIDGE U-RIB STIFFENED PLATES BASED ON THE CONCEPT OF STRUCTURAL INTENSITY. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.061.

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Due to its advantages of good mechanical properties, simple appearance and strong adaptability, the steel box girder is being widely utilized in urban bridges. The noise radiated by steel box girders subjected to vehicle impacts has the characteristics of wide-spectrum, high-magnitude and control difficulty. U-rib stiffened roof, as a part of the steel box girder, directly bears the input load, which is the basis of studying the vibration of the steel box girder. Currently, the investigation on the vibro-acoustic performance of U-rib plates is very limited. With this regard, this paper introduces the concept of Structural Intensity (SI). The SI vector is calculated by the Finite Element (FE) method. The power flow is visualized by the self-programming post-processing code. The global and local vibration energy transmission characters of a U-rib stiffened plate under a harmonic nodal force are analyzed. Further, the influence of plate thickness is investigated. The optimum design is carried out based on the engineering standard dimensions. The research results indicate that increasing the thickness ratio of the U-rib to the baseplate is beneficial to reducing the vibration.

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Health hazard evaluation report: HETA-2007-0235-3064, evaluation of potential noise hazards to mechanics and 911 dispatchers at a fire department, Anchorage, Alaska. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, June 2008. http://dx.doi.org/10.26616/nioshheta200702353064.

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