by Ray W. Herrick Laboratories, School of Mechanical Engineering, Purdue University in West Lafayette, Ind .
Written in English
|Series||NASA-CR -- 182509., NASA contractor report -- NASA CR-182509.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
A STUDY OF METHODS TO PREDICT AND MEASURE THE TRANSMISSION OF SOUND THROUGH THE WALLS OF LIGHT AIRCRAFT Research Grant #NAGl PRF # SEMI-ANNUAL STATUS REPORT: REPORTING PERIOD 5/15/86 - 11/15/86 Sponsored by NASA Report No. HL Submitted by: R. J. Bernhard, Principal Investigator J.S. Bolton, Assistant Professor. A study of methods to predict and measure the transmission of sound through the walls of light aircraft. Integration of certain singular boundary element integrals for applications in linear acoustics. The SEA theory was used to develop a theoretical model to predict the transmission loss through an aircraft window. This work mainly consisted of the writing of two computer programs. One program predicts the sound transmission through a plexiglass window (the case of Cited by: 1. The Sound Transmission Class (STC), measured in decibels, is used to measure building material's ability to absorb sound. The STC can be used to measure sound absorption for both external building walls and internal walls in single and multifamily structures. The STC is .
The objectives are: measurement of dynamic properties of acoustical foams and incorporation of these properties in models governing three-dimensional wave propagation in foams; tests to measure sound transmission paths in the HP Jetstream 3; Author: R. J. Bernhard, J. S. Bolton, B. Gardner, J. Mickol, C. Mollo, C. Bruer. The Sound Transmission Class (STC) is a single-number rating of a material’s or assembly’s barrier effect. Higher STC values are more efficient for reducing sound transmission. For example, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. I2 = Intensity transmitted to room 2 and since I1 = ¼ the intensity in a plane wave, the sound power striking the left side of the wall is: W c SW p W I S 4 2 1 1 1 ρ = = In the receiving room (Room 2), we know that whatever power comes through the common wall, must eventually be absorbed in that Size: 1MB. Sound Transmission Class (STC) is an integer rating of how well a building partition attenuates airborne sound. In the USA, it is widely used to rate interior partitions, ceilings and floors, doors, windows and exterior wall configurations (see ASTM International Classification E and E90).
An undercut and an _____ on the underside of a sill prevent water from flowing back against the wall surface. Drip edge When installed along the bottom edges of floor joists, resilient furring ________ reduce sound transmission between adjoining floors. predict sound transmission into enclosures through local ized vibrating elastic surfaces. Experi- mental data are also presented to verify these predictions. The emphasis is placed on light propel 1 er-dri ven aircraft. However, the methods presented could be generalized and extended to other types of aircraft. The sidewalls of the. A theoretical model of sound transmission through a cylindrical shell is presented. The acoustic intensity technique was applied to the sound transmission loss of . Books at Amazon. The Books homepage helps you explore Earth's Biggest Bookstore without ever leaving the comfort of your couch. Here you'll find current best sellers in books, new releases in books, deals in books, Kindle eBooks, Audible audiobooks, and so much more.