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Gotowa bibliografia na temat „Sound transmission loss sound radiation”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 9 lutego 2022

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Artykuły w czasopismach na temat "Sound transmission loss sound radiation"

Suga, Hiromi, i Hideki Tachibana. "Sound Radiation Characteristics of Lightweight Roof Constructions Excited by Rain". Building Acoustics 1, nr 4 (grudzień 1994): 249–70. http://dx.doi.org/10.1177/1351010x9400100401.

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In order to investigate the sound radiation characteristics of lightweight roof constructions when excited by rainfall, an artificial rainfall apparatus was constructed to simulate natural rainfall conditions. From the measurement results, it can be seen that the facility developed is practically applicable for the examination of the sound radiation characteristics of rain noise. It was therefore used in the measurement of sound power of 20 lightweight roofs. In addition, the relationship between sound power level and sound transmission loss measured by the sound intensity method was investigated statistically. As a result, it has been shown that a linear relationship exists between them and there is a possibility of estimating the sound power level from the transmission loss.

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KUROSAWA, Yoshio, Taichi TSUNEKI, Tsuyoshi YAMASHITA, Tetsuya OZAKI, Yuki FUJITA, Taro MUSHIAKE, Manabu TAKAHASHI i Naoyuki NAKAIZUMI. "Radiation Sound and Transmission Loss Analysis for Automotive Floor Carpet". Proceedings of the Dynamics & Design Conference 2020 (25.08.2020): 342. http://dx.doi.org/10.1299/jsmedmc.2020.342.

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Kumar, Sathish, Leping Feng i Ulf Orrenius. "Predicting the Sound Transmission Loss of Honeycomb Panels using the Wave Propagation Approach". Acta Acustica united with Acustica 97, nr 5 (1.09.2011): 869–76. http://dx.doi.org/10.3813/aaa.918466.

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The sound transmission properties of sandwich panels can be predicted with sufficient degree of accuracy by calculating the wave propagation properties of the structure. This method works well for sandwich panels with isotropic cores but applications to panels with anisotropic cores are hard to find. Honeycomb is an example of anisotropic material which when used as a core, results in a sandwich panel with anisotropic properties. In this paper, honeycomb panels are treated as being orthotropic and the wavenumbers are calculated for the two principle directions. These calculated wavenumbers are validated with the measured wavenumbers estimated from the resonance frequencies of freely hanging honeycomb beams. A combination of wave propagation and standard orthotropic plate theory is used to predict the sound transmission loss of honeycomb panels. These predictions are validated through sound transmission measurements. Passive damping treatment is a common way to reduce structural vibration and sound radiation, but they often have little effect on sound transmission. Visco-elastic damping with a constraining layer is applied to two honeycomb panels with standard and enhanced fluid coupling properties. This enhanced fluid coupling in one of the test panels is due to an extended coincidence range observed from the dispersion curves. The influence of damping treatments on the sound transmission loss of these panels is investigated. Results show that, after the damping treatment, the sound transmission loss of an acoustically bad panel and a normal panel are very similar.

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Zhang, Tong, Ludi Kang, Xin Li, Hongbo Zhang i Bilong Liu. "Sound Transmission Prediction of Sandwich Plates With Honeycomb and Foam Cores and an Emphatic Discussion on Radiation Terms". International Journal of Acoustics and Vibration 26, nr 1 (30.03.2021): 70–79. http://dx.doi.org/10.20855/ijav.2020.25.11735.

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When applying the modal summation method to the sound transmission loss (STL) prediction of various plates, the assumption of the blocked sound pressure, or alternatively speaking, ignoring sound radiation terms, has obvious simplicity and is sometimes used for the single-layered panels, rib-stiffened plates or heavily damped sandwich plates. For light-weighted sandwich plates with honeycomb and foam cores, however, this assumption is somewhat in doubt and worth examining. Based on sixth-order differential equations governing the flexural vibration of sandwich plates, the prediction formula of STL is derived by the modal summation approach. Theoretical predictions were validated by measurement data. Next, the theoretical formula of STL under the assumption of the blocked sound pressure was examined. The STL discrepancies of sandwich plates caused by sound radiation terms are illustrated. It was found that the STL discrepancies of sandwich plates were closely related to frequency, reached their peak value at the coincidence frequency region. The results indicate that the sound radiation terms, or the couplings between the radiated sound pressure and the plate response, should not be ignored for the prediction of STL for sandwich plates with honeycomb and foam cores.

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Zhang, Rui, Desen Yang, Shengguo Shi i Boquan Yang. "Model approximation for sound transmission from underwater structures in high-frequency range". MATEC Web of Conferences 283 (2019): 09007. http://dx.doi.org/10.1051/matecconf/201928309007.

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Sound-insulation model provides a straightforward way to describe sound transmission behaviours of the thin-walled structures in engineering applications. The sound transmission characteristics depend on the parameters of incident wave, such as incident wave amplitude and incident angles. However, this model is limited when the sound source is located in an enclosed space (e.g., noise source in underwater cabins), because it is difficult to obtain incident angles especially in the high-frequency range. In this paper, we develop a simply analytical model that can effectively study the sound transmission from an enclosed shell with internal acoustic excitation. In order to extend the application of the sound-insulation model to a submerged shell, the structural vibration equation is firstly simplified to the plate vibration equation. Then, the sound pressure near the inner surface of the shell is decomposed into an expansion of orthogonal cavity eigenmodes, and each cavity mode is replaced by two pairs of incident plane waves. Finally, the acoustic transmission loss can be obtained by substituting the parameters of incident waves into the sound-insulation model. Numerical results show that the sound transmission for the fundamental cavity mode (0, 0, 0) can be explained by the normal incidence in the sound-insulation model, while every other modes corresponds to a group of oblique incident plane waves whose incident angles decrease monotonically with the increase of frequency. In addition, it can be observed that the total reflection phenomenon in the sound-insulation model is consistent with the low radiation efficiency of the high order modes in the shell model.

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Chandra, N., S. Raja i K. V. N. Gopal. "A Comprehensive Analysis on the Structural–Acoustic Aspects of Various Functionally Graded Plates". International Journal of Applied Mechanics 07, nr 05 (październik 2015): 1550072. http://dx.doi.org/10.1142/s1758825115500726.

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The vibration, sound radiation and transmission characteristics of plates with various functionally graded materials (FGM) are explored and a detailed investigation is presented on the influence of specific material properties on structural–acoustic behavior. An improved model based on a simplified first order shear deformation theory along with a near-field elemental radiator approach is used to predict the radiated acoustic field associated with a given vibration and acoustic excitation. Various ceramic materials suitable for engineering applications are considered with aluminum as the base metal. A power law is used for the volume fraction distribution of the two constitutive materials and the effective modulus is obtained using the Mori–Tanaka homogenization scheme. The structural–acoustic response of these FGM plates is presented in terms of the plate velocity, radiated sound power, sound radiation efficiency for point and uniformly distributed load cases. Increase in both vibration and acoustic response with increase in power law index is observed for the lower order modes. The vibro–acoustic metrics such as root-mean-squared plate velocity, overall sound power, frequency averaged radiation efficiency and transmission loss, are used to rank these materials for vibro–acoustically efficient combination. Detailed analysis has been made on the factors influencing the structural–acoustic behavior of various FGM plates and relative ranking of particular ceramic/metal combinations.

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Mao, Jie, Zhi Yong Hao, Xin Rui Chen i Ji Yang. "The Application of SEA in Automobile Dash Sound Transmission Loss Numerical Calculation". Applied Mechanics and Materials 152-154 (styczeń 2012): 894–99. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.894.

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In order to study the structure-borne sound radiation, statistical energy analysis (SEA) was adopted and an automobile dash was divided into 31 subsystems; the modal density, damping loss factor (DLF) and coupling loss factor (CLF) were acquired, which were the basic parameters of SEA; then dash transmission loss (TL) at the middle and high frequency (MHF) ranging from 100 Hz to 10k Hz was calculated. The most outstanding advantage of SEA was that calculation could be fast done, which was more convenient than FEM (Finite Element Method) and BEM (Boundary Element Method). Finally, a TL experiment was designed to verify the feasibility and reliability of numerical calculation. The 1/3 octave TL curves of the simulation and experiment show a good consistency and the error is engineering permitted, which means SEA simulation possesses high credibility and can guide the engineering research.

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SEOK, JIN WAN, SUNG DAE NA, KI WOONG SEONG, JYUNG HYUN LEE i MYOUNG NAM KIM. "DEVELOPMENT OF A SUBMINIATURE PARAMETRIC TRANSDUCER FOR HEARING REHABILITATION". Journal of Mechanics in Medicine and Biology 19, nr 07 (listopad 2019): 1940041. http://dx.doi.org/10.1142/s0219519419400414.

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Hearing loss is becoming increasingly common due to the aging of society and the development of multimedia devices. Hearing loss is classified by hearing level, and patients require early diagnosis and rehabilitation. To overcome hearing loss, hearing aids are used, but conventional hearing aids have disadvantages that reduce the efficiency of speech transmission. In this paper, we proposed a subminiature ultrasonic transducer with a miniaturized parametric speaker. The transducer generates sound waves with high directionality. These sound waves are focused on the umbo located the center of the tympanic membrane and connected to ossicles of the middle ear. To generate sound waves, various parameters are considered, such as target distance, radiation area, and primary frequency. We tested the directionality of the proposed transducer using extracted parameters at audible frequencies. As a result, we confirmed high directionality and audible sound generated by the proposed transducer. The method can be expected to be applied to high-efficiency hearing rehabilitation devices and various multimedia devices.

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Mao, Qi Bo. "Active Control of Sound Transmission Trough a Double Wall Structure". Applied Mechanics and Materials 138-139 (listopad 2011): 858–63. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.858.

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Based on coupling structural-acoustic modal model, using piezoelectric materials and loudspeaker/microphones as actuator/sensors, the analytical simulations are presented for the actively controlled the sound transmission through double plate structure. Firstly, the results show the potential for using PVDF sensors to improve sound transmission loss. Secondly, the effects of parameters of actuator/sensor and double plate structure on control performances are discussed. And some useful conclusions are obtained, for example, if volume velocity sensor is applied to radiating plate, transmission loss will improve significantly, no matter what type actuators (i.e. loudspeakers or PZT actuators on either plate) are used; symmetrical rectangular PVDF sensors should be applied on radiating plate; using loudspeaker/microphone configuration should be avoided for the same thickness double plate structure; the increased thickness of cavity leads to the better control performance.

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Talebitooti, R., MR Zarastvand i HD Gohari. "Investigation of power transmission across laminated composite doubly curved shell in the presence of external flow considering shear deformation shallow shell theory". Journal of Vibration and Control 24, nr 19 (5.09.2017): 4492–504. http://dx.doi.org/10.1177/1077546317727655.

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This study applies shear deformation shallow shell theory to inspect the acoustic behavior of laminated composite infinitely long doubly curved shallow shells subject to a radiating oblique plane sound wave. Herewith, a procedure is developed to investigate sound transmission loss through this shell, clarified as a ratio of incident power to transmitted power in the existence of mean flow. In a further step, displacements are developed as a linear combination of the thickness coordinate to designate an analytical solution based on shear deformation shallow shell theory. Consequently, an exact solution for sound transmission loss is brought forward by combining acoustic wave equations as a result of wave propagation through this shell with doubly curved shell equations of motion. Afterwards, the accuracy of the present formulation (shear deformation shallow shell theory) is determined by comparing the achieved results with those available in the literature and some assumptions associated with the geometric specifications of the plate are investigated. Finally, because of the remarkable achievement of the current formulation results in reduction of noise transmission into such structures, some effective parameters on sound transmission loss are used in numerical results, to solve this problem.

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Rozprawy doktorskie na temat "Sound transmission loss sound radiation"

Pavasovic, Vladimir, i vpavasovic@wmgacoustics com au. "The radiation of Sound from Surfaces at Grazing Angles of Incidence". RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20060911.115939.

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It is difficult to predict the sound radiation from large factory roofs. The existing infinite panel theories of sound insulation are not sufficient when the sound radiates at grazing angles. It has been shown that the reason for the collapse of the theory is the well known result for the radiation efficiency. This research will present a simple analytic strip theory, which agrees reasonably well with numerical calculations for a rectangular panel. Simple analytic strip theory has lead to the conclusion that it is mainly the length of the panel in the direction of radiation, rather than its width that is important in determining its radiation efficiency. The findings of the current research also indicated that apart from the effect due to coincidence, a panel was non-directional compared to an opening.

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Cambridge, Jason Esan. "The Sound Insulation of Cavity Walls". Thesis, University of Canterbury. Mechanical Engineering, 2012. http://hdl.handle.net/10092/7332.

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Lightweight building materials are now commonly employed in many countries in preference to heavyweight materials. This has lead to extensive research into the sound transmission loss of double leaf wall systems. These studies have shown that the wall cavity and sound absorption material placed within the cavity play a crucial role in the sound transmission through these systems. However, the influence of the wall cavity on the sound transmission loss is not fully understood. The purpose of this research is to obtain a comprehensive understanding of the role played by the wall cavity and any associated sound absorption material on the sound transmission loss through double leaf wall systems. The research was justified by the fact that some of the existing prediction models do not agree with some observed experimental trends. Gösele’s theory is expanded and used in the creation of an infinite and finite vibrating strip model in order to acquire the desired understanding. The sound transmission loss, radiated sound pressure and directivity of double leaf systems composed of gypsum boards and glass have been calculated using the developed model. A method for calculating the forced radiation efficiency has also been proposed. Predictions are compared to well established theories and to reported experimental results. This work also provides a physical explanation for the under-prediction of the sound transmission loss in London’s model; explains why Sharp’s model corresponds to Davy’s with a limiting angle of 61° and gives an explanation for Rindel’s directivity and sound transmission loss measurements through double glazed windows. The investigation also revealed that a wide variety of conclusions were obtained by different researchers concerning the role of the cavity and the properties of any associated sound absorption material on the sound transmission loss through double wall systems. Consequently recommendations about the ways in which sound transmission through cavity systems can be improved should always be qualified with regard to the specific frequency range of interest, type of sound absorption material, wall panel and stud characteristics.

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Ramanathan, Sathish Kumar. "The effects of damping treatment on the sound transmission loss of honeycomb panels". Licentiate thesis, KTH, MWL Structural and vibroacoustics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12514.

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In the industry, all passenger vehicles are treated with damping materials to reduce structure-borne sound. Though these damping materials are effective to attenuate structure-borne sound, they have little or no effect on the air-borne sound transmission.The lack of effective predictive methods for assessing the acoustic effects due to added damping on complex industrial structures leads to excessive use of damping materials.Examples are found in the railway industry where sometimes the damping material applied per carriage is more than one ton. The objective of this thesis is to provide a better understanding of the application of these damping materials in particular when applied to lightweight sandwich panels.

As product development is carried out in a fast pace today, there is a strong need for validated prediction tools to assist in the design process. Sound transmission loss of sandwich plates with isotropic core materials can be accurately predicted by calculating the wave propagation in the structure. A modified wave propagation approach is used to predict the sound transmission loss of sandwich panels with honeycomb cores. The honeycomb panels are treated as being orthotropic and the wave numbers are calculated for the two principle directions. The orthotropic panel theory is used to predict the sound transmission loss of panels. Visco-elastic damping with a constraining layer is applied to these structures and the effect of these damping treatment on the sound transmission loss is studied. Measurements are performed to validate these predictions.

Sound radiated from vibrating structures is of great practical importance.The radiation loss factor represents damping associated with the radiation of sound as a result of the vibrating structure and can be a significant contribution for structures around the critical frequency and for composite structures that are very lightly damped. The influence of the radiation loss factor on the sound reduction index of such structures is also studied.

QC 20100519
ECO2-Multifunctional body Panels

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Liu, Bilong. "Acoustical Characteristics of Aircraft Panels". Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4102.

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Phillips, Timothy Jason Nirmal. "Sound Transmission Loss of Sandwich Panels". Thesis, University of Canterbury. Department of Mechanical Engineering, 2012. http://hdl.handle.net/10092/9210.

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The sound transmission loss characteristics of plywood based sandwich panels were investigated. Measurements were made of the sound transmission loss of a range of materials and used as a baseline for comparison while a sound transmission loss optimisation method was developed. A unique test rig was built and calibrated to determine selected mechanical properties of materials of interest. The results of sound transmission loss and material properties measurements were used to select an appropriate prediction model, which was then used in conjunction with a mathematical optimisation model to determine combinations of materials and panel parameters which result in improved sound transmission loss. An effort was made to reproduce these predictions in experimental testing by constructing several prototype panels.

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Cowan, Andre James. "Sound Transmission Loss of Composite Sandwich Panels". Thesis, University of Canterbury. Mechanical Engineering, 2013. http://hdl.handle.net/10092/7879.

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This thesis examines the sound transmission loss (STL) through composite sandwich panel systems commonly used in the marine industry. Experimental, predictive and optimisation methods are used to evaluate the acoustic performance of these systems and to improve their acoustic performance with noise treatment. The complex nature of the material properties of composite sandwich panels was found to be dependent not only on the physical properties but also the frequency of incident noise. Young’s modulus was found to reduce with increasing frequency as has been predicted in the literature which is due to the shear stiffness dominating over the bending stiffness. Two methods for measuring these properties were investigated; ‘fixed-free’ and ‘free-free’ beam boundary condition modal analyses. The disagreement between these methods was identified as the clamping fixed nature that increased flexibility of the beam. Composite sandwich panels can be modelled as homogeneous isotopic materials when predicting their acoustic performance provided the dilatational resonance is above the frequency range of interest. Two such panels were modelled using this simple sound insulation prediction method, but the agreement between theory and experimental results was poor. A variable Young’s modulus was included in the model but agreement remained relatively poor especially in the coincidence frequency region due to variation of Young’s modulus with frequency. A statistical method of optimisation of the parameter settings by fractional factorial design proved successful at identifying the important parameters that affect the sound transmission class (STC) of a noise treatment material applied to a panel. The decouple foam layer and attachment method were the most significant factors. The same method, with higher resolution was then used to identify the important parameters that affected the noise reduction class (NRC) finding that the outer foam thickness without a face sheet were the most significant factors. The independent optimisation studies performed for each of the STC and NRC produced conflicting results meaning that both could not be achieved simultaneously.

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Hannink, Marieke Henriëtte Cathrien. "Acoustic resonators for the reduction of sound radiation and transmission". Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/58025.

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Sors, Thomas Christopher. "Active structural acoustic control of sound transmission through a plate". Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326822.

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Wareing, Robin Richard. "Investigation and Prediction of the Sound Transmission Loss of Plywood Constructions". Thesis, University of Canterbury. Mechanical Engineering, 2015. http://hdl.handle.net/10092/10455.

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The sound transmission loss of a range of plywood panels was measured to investigate the influence of the orthotropic stiffness of the plywood panels. The plywood panels were tested as single and also double leaf partitions, with a range of stud configurations. A new method was developed for predicting the sound transmission loss of single leaf partitions with both orthotropic and frequency dependent stiffness values. The sound transmission loss was evaluated for two significantly different sample sizes. The observed influence of the sample size on the measured sound transmission loss was profound. The construction of the partition was shown to significantly affect the influence of the sample size on the sound transmission loss. A qualitative analysis based on existing published research of the contributing factors is presented, and methods for adjusting the results for the small sample size for comparison with the large results were developed. The influence of a range of acoustic treatments of lightweight plywood partitions was investigated. The treatments involved internal viscoelastic materials and decoupled mass loaded barriers in various arrangements. The attachment between the treatment and the plywood panel was found to influence the sound transmission loss significantly. A prediction method based on published models was modified to allow the influence of the treatments to be included. Reasonable agreement was achieved between the predicted and measured results for a wide range of samples. A prediction method was developed that accounts for the influence of orthotropic, frequency dependent material parameters. This method utilised an adaptive, numerical integration method to solve an analytical formulation for the sound transmission loss. The influence of the finite sample size was accounted for using an expression for the finite panel radiation impedance. The finite panel radiation impedance was predicted analytically and an approximation was also presented. The presence of a significant source room niche was accounted for by applying an appropriate limit to the integration range of the angle of incidence. The prediction methods developed are compared with the measured transmission loss results from both the small and large test facilities. Good agreement was seen for some of the predicted results. Generally the agreement within the coincidence region was worse than for the rest of the transmission loss curve. The inclusion of orthotropic and frequency dependent stiffness values significantly improved the agreement within the coincidence region.

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Thomas, Ashwin Paul. "Simulated and laboratory models of aircraft sound transmission". Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52319.

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With increased exposure to transportation noise, there have been continued efforts to help insulate homes from aircraft noise. Current aircraft noise guidelines are based primarily on outdoor sound levels. As people spend the majority of their time indoors, however, human perception is evidently more related to indoor sound levels. Investigations are being made to provide further insight into how typical residential constructions affect indoor response. A pilot study has built a single-room "test house", according to typical construction for mixed-humid climate regions, and has directly measured outdoor-to-indoor transmission of sound - with specific focus on continuous commercial aircraft signatures. The results of this study are being used to validate and improve modelling software that simulates a wide range of construction types and configurations for other US climate regions. The improved models will allow for increased flexibility in simulating the impacts of acoustic and energy retrofits. Overall, the project intends to improve the ability to predict acoustic performance for typical US construction types as well as for any possible design alterations for sound insulation.

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Książki na temat "Sound transmission loss sound radiation"

P, Gardonio, red. Sound and structural vibration: Radiation, transmission and response. Wyd. 2. Amsterdam: Elsevier/Academic, 2007.

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Sound and structural vibration: Radiation, transmission, and response. London: Academic Press, 1985.

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Radiation acoustics. Boca Raton, FL: CRC Press, 2003.

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Rudder, Fred F. Airborne sound transmission loss characteristics of wood-frame construction. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1985.

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Zali͡ubovskiĭ, Ilʹi͡a Ivanovich. Vvedenie v radiat͡sionnui͡u akustiku. Kharʹkov: Izd-vo pri Kharʹkovskom gos. universitete izdatelʹskogo obedinenii͡a "Vyshcha shkola", 1986.

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Radiat͡sionnai͡a akustika. Moskva: Nauka, 1996.

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Mason, J. M. The use of acoustically tuned resonators to improve the sound transmisssion loss of double panel partitions. Southampton, England: University of Southampton, Institute of Sound and Vibration Research, 1986.

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Hanish, S. A treatise on acoustic radiation. Wyd. 3. Washington, D.C: Naval Research Laboratory, 1989.

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Hanish, S. A treatise on acoustic radiation. Wyd. 3. Washington, D.C: Naval Research Laboratory, 1989.

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Vibrations and acoustic radiation of thin structures: Physical basis, theoretical analysis and numerical methods. Hoboken, N.J: ISTE/John Wiley, 2008.

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Części książek na temat "Sound transmission loss sound radiation"

Miles, Ronald N. "Sound Transmission Loss". W Mechanical Engineering Series, 53–82. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22676-3_3.

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Nilsson, Anders, i Bilong Liu. "Sound Transmission Loss of Panels". W Vibro-Acoustics, Volume 2, 215–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47934-6_13.

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Foreman, John E. K. "Absorption, Silencers, Room Acoustics, and Transmission Loss". W Sound Analysis and Noise Control, 110–63. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-6677-5_5.

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Lu, Tianjian, i Fengxian Xin. "Sound Radiation, Transmission of Orthogonally Rib-Stiffened Sandwich Structures". W Springer Tracts in Mechanical Engineering, 225–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55358-5_5.

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Li, C., Z. Chen i Y. Jiao. "Study on Sound Transmission Loss of Lightweight FGM Sandwich Plate". W Computational and Experimental Simulations in Engineering, 1317–28. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27053-7_111.

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Wang, Xiufeng, i Jie Shi. "Research of Acoustic Parts in Vehicle Sound Transmission Loss Test Method". W Lecture Notes in Electrical Engineering, 645–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33832-8_52.

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Tan, W. H., A. S. N. Amirah, S. Ragunathan, N. A. N. Zainab, A. M. Andrew i W. Faridah. "Development a Cost-Effective Impedance Tube for Sound Transmission Loss Measurement". W Lecture Notes in Mechanical Engineering, 1217–26. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0866-7_107.

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Soussi, Chaima, Walid Larbi i Jean-François Deü. "Experimental and Numerical Analysis of Sound Transmission Loss Through Double Glazing Windows". W Applied Condition Monitoring, 195–203. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94616-0_20.

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Onbaşlı, Mehmet C. "Design and Modeling of High-Strength, High-Transmission Auto Glass with High Sound Transmission Loss". W Handbook of Materials Modeling, 1–18. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-50257-1_101-1.

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Onbaşlı, Mehmet C. "Design and Modeling of High-Strength, High-Transmission Auto Glass with High Sound Transmission Loss". W Handbook of Materials Modeling, 2091–108. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-44680-6_101.

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Streszczenia konferencji na temat "Sound transmission loss sound radiation"

Santoni, Andrea, Paolo Bonfiglio, Patrizio Fausti i Stefan Schoenwald. "Predicting sound radiation efficiency and sound transmission loss of orthotropic cross-laminated timber panels". W 173rd Meeting of Acoustical Society of America and 8th Forum Acusticum. Acoustical Society of America, 2017. http://dx.doi.org/10.1121/2.0000626.

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Hawwa, Muhammad A., i Ali H. Nayfeh. "Control of Structure-Borne Sound Using Periodically Varying Rigidity". W ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0419.

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Abstract Subsonic modes may cause significant radiation when they scatter at a discontinuity. In this study, we suggest an approach to filter out subsonic waves before they reach the discontinuities on the structure. This is done by imposing a material (parametric) periodicity in a fluid-loaded structure, which leads to a strong stopband interaction under a Bragg condition. The interaction is analytically described by the coupled-mode equations, derived using the method of multiple scales. Numerical illustrations are given in terms of the transmission loss for different fluid-loaded plates. The results can be utilized to suppress the undesired acoustic radiation generated by fluid-loaded structures.

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Mir, Fariha, i Sourav Banerjee. "Performance of a Multifunctional Spiral Shaped Acoustic Metamaterial With Synchronized Low-Frequency Noise Filtering and Energy Harvesting Capability". W ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2264.

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Abstract Metamaterials are man-made materials that behave uniquely and possess exclusively desired properties that are not found in natural materials. Usually, it is the combination of two or more materials and can be engineered to perform tasks that are not possible with traditional materials. These were initially discovered while working with electromagnetic radiation. Apart from electromagnetic radiation, metamaterials are also capable of affecting the wave propagation characteristics through any fluid such as air. These metamaterials are called acoustic metamaterials. Many acoustic metamaterials have gone beyond its definition but still, characterize the waveguiding properties. Incorporation of smart materials while constructing acoustic metamaterial, can achieve multifunctionality of the design. A prospective application field for such acoustic metamaterials is energy harvesting from low-frequency vibration. It is conceptualized that acoustic metamaterials can be used as noise barrier materials to filter roadside and industrial noise. This application can get extended to the aerospace application where engine noise mitigation inside the cabin is a challenge. In this article, a spiral-shaped acoustic metamaterial is modeled which has a dual function of noise filtering and energy harvesting. This acoustic metamaterial has a comparatively high reflection coefficient closer to the anti-resonance frequencies, resulting in high sound transmission loss. The filtered noise is trapped inside the cell in the form of strain energy. Hence, we claim that if the trapped energy which is any way wasted in the material could be harvested to power the local electronic devices, the new solution could make transformative for the 21st century’s green energy solution. Calculated placement of smart materials in the cell-matrix can help to extract the strain energy in the form of power. The acoustic metamaterial cell presented in this work has the capability of isolating noise and reducing diffraction by trapping sound in low frequencies and at the same time recover the trapped abundant energy in the form of electrical potential using piezoelectric materials. The spiral design is sensitive to vibration due to trampoline shaped attachments inside the cell. This makes it capable of harvesting energy using vibration also. This is a promising acoustoelastic metamaterial with multifunctionality properties for future applications.

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Gesch, E., R. E. Wentzel i C. Riedel. "Controlled Angle Sound Transmission Loss Experiment". W SAE 2003 Noise & Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-1630.

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Wentzel, Richard E., i Pranab Saha. "Empirically Predicting the Sound Transmission Loss of Double-Wall Sound Barrier Assemblies". W SAE Noise and Vibration Conference and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/951268.

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Leite, Pierre, Marc Thomas, Frank Simon i Yves Bréchet. "Optimal Design of an Asymmetrical Sandwich Panel for Acoustical and Mechanical Properties". W ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82504.

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The aim of the present study is to develop specific tools to design optimal panels for multi-objective applications. The objectives considered are stiffness, strength and acoustic insulation at minimum weight. A genetic algorithm is used to design optimal sandwich structures with a good balance of mechanical and acoustical properties. The bending stiffness and mechanical strength of the panel are calculated using beam theory. This analysis is focused on a 3-point bending test, giving the stiffness as the ratio between the concentrated force and the deflection at the center of the sandwich panel. The strength is calculated as the critical force at the onset of plastic deformation. A vibro-acoustical model based on Lagrange’s equations is used to give access to the sound transmission loss of the sandwich panel with anisotropic elastic layers. The main interest is on the mean transmission loss for a diffused incident acoustic field over the frequency range 500–10000Hz. First of all, the optimal design for mechanical properties is assessed at a minimal weight. Quite expectedly, the best solutions are composite-skin with high specific stiffness and soft cores with high shear modulus for a minimum weight. The geometry depends on the required stiffness and strength. The design/properties relationship is discussed by monitoring the evolution of both the material properties and the geometry of the panel. Similarly, a parametric study is performed for acoustical design at minimal weight. In order to maximize the mean transmission loss, it is preferable to lower the critical frequency for which acoustic radiating is maximal. Then, the best solutions for the panel are those who maximize the square root of the density over Young’s modulus. The trade-off between mass and loss transmission is then explored. A comparison between all these solutions provides significant differences in the design with respect to the objectives. In the next step, a multi-objective genetic algorithm is used to find an optimized panel with a good compromise between acoustical and mechanical properties. The optimization is considered with several approaches depending on whether the mass is regarded as the cost function or as a constraint. This study thus provides a preview of the capabilities of multi-objective optimization in design of sandwich panel.

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Dinsmore, Michael L. "SAE J1400 Sound Transmission Loss Round Robin Results". W SAE 2005 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-2438.

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Wang, Chong, i Alan Parrett. "Damping Mass Effects on Panel Sound Transmission Loss". W SAE 2011 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2011. http://dx.doi.org/10.4271/2011-01-1633.

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Xie, Shi-lin, i Sheng-jiang Liu. "Sound transmission loss characteristics of single corrugated panel". W 2010 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA 2010). IEEE, 2010. http://dx.doi.org/10.1109/spawda.2010.5744296.

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Tracey, Brian H., i Liangyu (Mike) Huang. "Transmission Loss for Vehicle Sound Packages with Foam Layers". W Noise & Vibration Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1999. http://dx.doi.org/10.4271/1999-01-1670.

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Raporty organizacyjne na temat "Sound transmission loss sound radiation"

Rudder, Fred F. Airborne sound transmission loss characteristics of woodframe construction. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 1985. http://dx.doi.org/10.2737/fpl-gtr-43.

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Sun, Xin, Kevin L. Simmons i Mohammad A. Khaleel. Characterization of Sound Transmission Loss of Laminated Glass with Analytical and Experimental Approaches. Office of Scientific and Technical Information (OSTI), listopad 2005. http://dx.doi.org/10.2172/883220.

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Hart, Carl R., D. Keith Wilson, Chris L. Pettit i Edward T. Nykaza. Machine-Learning of Long-Range Sound Propagation Through Simulated Atmospheric Turbulence. U.S. Army Engineer Research and Development Center, lipiec 2021. http://dx.doi.org/10.21079/11681/41182.

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Conventional numerical methods can capture the inherent variability of long-range outdoor sound propagation. However, computational memory and time requirements are high. In contrast, machine-learning models provide very fast predictions. This comes by learning from experimental observations or surrogate data. Yet, it is unknown what type of surrogate data is most suitable for machine-learning. This study used a Crank-Nicholson parabolic equation (CNPE) for generating the surrogate data. The CNPE input data were sampled by the Latin hypercube technique. Two separate datasets comprised 5000 samples of model input. The ﬁrst dataset consisted of transmission loss (TL) ﬁelds for single realizations of turbulence. The second dataset consisted of average TL ﬁelds for 64 realizations of turbulence. Three machine-learning algorithms were applied to each dataset, namely, ensemble decision trees, neural networks, and cluster-weighted models. Observational data come from a long-range (out to 8 km) sound propagation experiment. In comparison to the experimental observations, regression predictions have 5–7 dB in median absolute error. Surrogate data quality depends on an accurate characterization of refractive and scattering conditions. Predictions obtained through a single realization of turbulence agree better with the experimental observations.

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Pettit, Chris, i D. Wilson. A physics-informed neural network for sound propagation in the atmospheric boundary layer. Engineer Research and Development Center (U.S.), czerwiec 2021. http://dx.doi.org/10.21079/11681/41034.

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We describe what we believe is the first effort to develop a physics-informed neural network (PINN) to predict sound propagation through the atmospheric boundary layer. PINN is a recent innovation in the application of deep learning to simulate physics. The motivation is to combine the strengths of data-driven models and physics models, thereby producing a regularized surrogate model using less data than a purely data-driven model. In a PINN, the data-driven loss function is augmented with penalty terms for deviations from the underlying physics, e.g., a governing equation or a boundary condition. Training data are obtained from Crank-Nicholson solutions of the parabolic equation with homogeneous ground impedance and Monin-Obukhov similarity theory for the effective sound speed in the moving atmosphere. Training data are random samples from an ensemble of solutions for combinations of parameters governing the impedance and the effective sound speed. PINN output is processed to produce realizations of transmission loss that look much like the Crank-Nicholson solutions. We describe the framework for implementing PINN for outdoor sound, and we outline practical matters related to network architecture, the size of the training set, the physics-informed loss function, and challenge of managing the spatial complexity of the complex pressure.

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