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Showing 1 to 14 of 14 for “"sound transmission loss"”.
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Sound transmission loss characteristics of three layer composite wall constructions
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Sound Transmission Loss Between Spaces Connected by Multiple Paths: A Newmeasurement Technique
Made available in DSpace on 2014-12-10T19:06:53Z (GMT). No. of bitstreams: 1 7212372.pdf: 3257018 bytes, checksum: b726831fca5d5a6c2d72b9322a8936ab (MD5) Previous issue date: 1971
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Structure-acoustic analysis; finite element modelling and reduction methods
… coupled to a flexible structure and/or a porous sound absorbing material domain. This type of analysis is applicable to a wide range of engineering problems, for example, studying the interior noise in a vehicle or the sound transmission loss in a wall between two dwellings. The geometrical …
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Estimating the upper ocean vertical temperature structure from surface temperature as applied to the southern Benguela
Underwater Sound Velocity Profiles (SVP) are used throughout the world by their respective navies for submarine and surface vessel strategic operations and exercises. Together with the sonar equations, the sound velocity profiles are of paramount importance to solve underwater sound detectability …
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Acoustical characterization and parameter optimization of polymeric noise control materials
The sound transmission loss (STL) characteristics of polymer-based materials are considered. Analytical models that predict, characterize and optimize the STL of polymeric materials, with respect to physical parameters that affect performance, are developed for single layer panel configuration and …
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Vibroacoustic analysis of panels using a wave and finite element method
… including wave propagation characteristics, sound transmission loss and sound radiation, of flat infinite and finite panels and infinite cylinders. In this method, a coupled fluid/structure system is considered. A segment of the structure is modelled using a conventional finite element (FE) …
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The acoustic modelling of dissipative elements in automotive exhausts
… method is assessed in the light of experimental sound transmission loss data measured for five different dissipative silencers. Mean flow in the central channel is a feature of each model, in addition to the use of the new semiempirical models for the perforated tube and the absorbent. A simple …
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Fabrication and Evaluation of Specialty Nonwoven Materials
… tensile strength, thermogravimetric analysis, sound absorption and transmission loss, scanning electronic microscopy and surface properties. Carbonization of cotton nonwoven was carried out in a high temperature oven with nitrogen between 300 °C and 500 °C. The physical activation was …
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Acoustic and visual tracking reveals distribution, song variability and social roles of humpback whales in Hawaiian waters
… and the cessation of singing suggests that the sounds of aerial behavior can convey information to other whales. Humpback whales song has been characterized as having the same structure shared by all individuals simultaneously. Chapter 4 found that the songs of individual whales were …
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Sound Radiation Responses and Acoustic Behvior of Sandwich Panel
Sandwich structures with decent sound insulation and absorption properties have been widely used in the engineering fields such as aerospace engineering, marine engineering and civil and construction engineering. Investigations on the acoustic behavior of sandwich structures is of practical …
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An Experimental Evaluation of the Application of Smart Damping Materials for Reducing Structural Noise and Vibrations
… the effect of smart damping materials on the sound transmission loss, a series of tests were conducted according to the SAE J1400 test specifications. The tests evaluate the transmission loss for smart damping materials for an undamped and a damped plate. The passive damping technique used for …
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Passive Acoustics: A Multifaceted Tool for Marine Mammal Conservation
<p>Marine mammals exploit the efficiency of sound propagation in the marine environment for essential activities like communication and navigation. For this reason, passive acoustics has particularly high potential for marine mammal studies, especially those aimed at population management and …