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Relevant bibliographies by topics / Acoustical transmission line

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Journal articles

Academic literature on the topic 'Acoustical transmission line'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Acoustical transmission line"

1

Tyutekin, V. V. "Acoustical characteristics of a multichannel transmission line." Acoustical Physics 46, no. 6 (2000): 710–15. http://dx.doi.org/10.1134/1.1326727.

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2

Chen, Yeongchin. "Acoustical transmission line model for ultrasonic transducers for wide-bandwidth application." Acta Mechanica Solida Sinica 23, no. 2 (2010): 124–34. http://dx.doi.org/10.1016/s0894-9166(10)60014-6.

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3

Sü, Zühre, and Mehmet Çalışkan. "Acoustical Design and Noise Control in Metro Stations: Case Studies of the Ankara Metro System." Building Acoustics 14, no. 3 (2007): 203–21. http://dx.doi.org/10.1260/135101007781998910.

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The aim of this research is to demonstrate the importance of initial strategies in acoustical design of underground metro stations. The paper searches for practical design solutions by evaluating different materials for providing optimum acoustical conditions in such spaces. Acoustical designs of three metro stations on a new expansion line in Ankara including Sogutozu, Bilkent and ODTU metro stations are presented through computer simulation. Predictions of room acoustical parameters are presented for both platform and ticket office floors in terms of parameters like reverberation time (RT), speech transmission index (STI) and A-weighted sound level (SPL) distribution within spaces. Simulated reverberation times are evaluated in view of legislative requirements. The study confirms the importance of using sound absorbing materials on the ceiling and sidewalls together. The nonwoven material, used behind perforated metal suspended ceilings, has proved effective in reverberation control.

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4

Keefe, Douglas H. "Acoustical transmission-line model of the middle-ear cavities and mastoid air cells." Journal of the Acoustical Society of America 137, no. 4 (2015): 1877–87. http://dx.doi.org/10.1121/1.4916200.

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5

MENEMENLIS, D. "Line-averaged measurement of velocity fine structure in the ocean using acoustical reciprocal transmission." International Journal of Remote Sensing 15, no. 2 (1994): 267–81. http://dx.doi.org/10.1080/01431169408954070.

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6

Ilkorur, Onur, Ismail Yuksek, and Emre Omurlu. "Usage of acoustical filters in transmission line enclosures as a replacement of fiber absorber." Journal of the Acoustical Society of America 117, no. 4 (2005): 2387. http://dx.doi.org/10.1121/1.4785762.

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7

Pasterkamp, Hans, Ignacio Sanchez, and Yunes Oh. "Teleauscultation: Bringing You to the Bedside." Canadian Respiratory Journal 2, no. 4 (1995): 237–40. http://dx.doi.org/10.1155/1995/530989.

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A custom-made device was used for the acquisition, digitization, compression, storage and telephone transmission of respiratory sounds and airflow data. Acoustical information from two patients at a small community in rural Manitoba was sent over a distance of 500 km via conventional telephone lines. Digital transmission left the respiratory sounds unaffected by telephone line noise. Data processing by computer at the receiving site provided more detail than would have been available on conventional auscultation. This new method for teleauscultation could be of value not only in remote areas but also for the surveillance of patients at home in urban settings.

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8

Xingguo, Wang, Shu Haisheng, and Zhang Lei. "Vibration and acoustic insulation properties of generalized phononic crystals." European Physical Journal Applied Physics 94, no. 3 (2021): 30902. http://dx.doi.org/10.1051/epjap/2021210036.

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Based on the previous studies, the concept of generalized phononic crystals (GPCs) is further introduced into the cylindrical shell structures, and a type of cylindrical shells of generalized phononic crystals (CS-GPCs) is constructed. Subsequently, the structure field and acoustic-structural coupled field of that composite cylindrical shells are examined respectively in this paper. Considering the Bloch theorem is not capable of explaining the generalized periodic situation existing in this structure field, a new analysis method involving transferring matrix eigenvalue based on the mechanical state vector is proposed to calculate the energy band structure. Through observing the energy band structure, an obvious wave band gap is obtained when the elastic wave propagates in the CS-GPCs for modes with different order, whose forming mechanism includes two aspects, i.e., the wave front expansion effect and the Bragg scattering effect. In addition, we further explore the related influences of the longitudinal wave mode and shear wave mode in structure on these band gaps, and some conclusions are illustrated. For acoustic-structural coupled field, the expressions of the acoustic transmission coefficients for different modes are built, and the frequency responses are numerically calculated to verify the band gap characteristics of the CS-GPCs. Furthermore, the acoustic pressure distribution of the internal and external acoustic fields is also analyzed in detail, and the influence laws of the parameters (offset distance and frequency) of the line source on acoustical pressure distribution and its directivity are explored.

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9

Chiu, Y. S., and C. F. Chen. "Time Reversal Processing Effect on Foci Structure in a Dynamic Ocean Waveguide." Journal of Mechanics 23, no. 3 (2007): 203–10. http://dx.doi.org/10.1017/s1727719100001234.

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AbstractTime-reversal mirror (TRM) was recently developed for underwater communication system application. This technique has been introduced as an approach to compensate for signal distortion due to multiple path effect in ocean waveguide. TRM is used in this paper for sending a message signal in ocean waveguide, received at time-reversal-array (TRA), and retransmitted to the dynamic ocean environment with an internal solitary wave. The focal structures obtained from different simulating cases are used for bidirectional transmission expediency, and the TRA is used as the relay-line or trunked radio. Ocean waveguide characteristic effects on acoustical properties are also shown in this paper, and focal structure in different ocean environments is analyzed to provide an optimal approach to underwater communication systems and for physical insight's interests.

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10

Lim, Siong Kang, Kar Poh Foo, Foo Wei Lee, et al. "Acoustic Properties of Lightweight Foamed Concrete with Eggshell Waste as Partial Cement Replacement Material." Sains Malaysiana 50, no. 2 (2021): 537–47. http://dx.doi.org/10.17576/jsm-2021-5002-24.

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Nowadays, almost every industry needs to undergo green and sustainable industrial revolution due to pollutions like waste dumping and noise that deteriorating the environment. Therefore, feasibility study on application of eggshell waste as partial cement replacement in lightweight foamed concrete was conducted by aiming to solve environmental and acoustical issues, i.e. reduce eggshell waste and improve acoustic properties. In this study, compressive strength and acoustic properties of 1300 kg m-3 lightweight foamed concrete with and without 5% eggshell powder as partial cement replacement material were tested. Optimal water to cement ratio of 0.6 was obtained for acoustic properties test by comparing compressive strength result. The result shows that application eggshell powder has generally reduced 7 days compressive strength but improved 28 days compressive strength, and either improve or maintain acoustics properties, in which lightweight foamed concrete that containing eggshell powder has improved noise reduction coefficient at testing ages of 7, 28, and 90 days and improved sound transmission class at testing age of 56 and 90 days. Based on these results, 5% of eggshell powder is feasible to be incorporated into lightweight foamed concrete as partial cement replacement material for sound insulation and strength development purposes.

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