Last edited by Kezragore
Saturday, May 16, 2020 | History

2 edition of Sound transmission through the walls of light aircraft found in the catalog.

Sound transmission through the walls of light aircraft

Sound transmission through the walls of light aircraft

an investigation of structure-borne noise in a Handley Page 137 "Jetstream III" aircraft.

  • 114 Want to read
  • 40 Currently reading

Published by Ray W. Herrick Laboratories, School of Mechanical Engineering, Purdue University in West Lafayette, Ind .
Written in English

    Subjects:
  • Airplanes -- Soundproofing.

  • Edition Notes

    SeriesNASA-CR -- 182509., NASA contractor report -- NASA CR-182509.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15288352M

    Get this from a library! A study of methods to predict and measure the transmission of sound through the walls of light aircraft: semi-annual status report:reporting period 5/15//15/ [Robert Bernhard; J S Bolton; United States. National Aeronautics and Space Administration.]. Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Outside the US, the Sound Reduction Index (SRI) ISO index is used. The STC rating figure very roughly.

    Airborne noise comes from common sound sources such as voices, TVs and radios. The noise performance of a building structure is called the Sound Transmission Class (STC). The higher the STC the better the structure is at isolating airborne noise. An STC rating of 45 means that the sound passing through the building is reduced by 45dB. Sound Transmission Class The decibel (dB) is used to express sound intensity or more intense a sound, the higher the dB sound transmission class (STC) is a numerical rating of the ability of a wall, floor/ceiling assembly or any other building element such as a door or window to minimize sound Size: KB.

    If you have trouble finding something light enough, consider using mass loaded vinyl as your second layer. Remember – lightweight aircraft are just that – lightweight. Make sure that the soundproofing materials you choose are no too heavy or they will weigh down your plane and may cause you problems. Regarding sound generated inside the building, there are two principal types of transmission. Firstly, airborne sound travels through walls or floor and ceiling assemblies and can emanate from either human activities in adjacent living spaces or from mechanical noise within the building systems.


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Sound transmission through the walls of light aircraft Download PDF EPUB FB2

The unit of measure for frequency is the hertz (Hz), which is one cycle per second. The human auditory system is capable of detecting sound frequencies between 20 Hz Hz, but humans are.

Sound transmission through the walls of light aircraft: an investigation of structure-borne noise in a Handley Page "Jetstream III" aircraft.

Author: United States. 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. 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. Bernhard, J.

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.

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Get this from a library. A Study of methods to predict and measure the transmission of sound through the walls of light aircraft. [United States. National Aeronautics and Space Administration.;]. 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. By D. Zimmerle and R. Bernhard. : D. Zimmerle and R. Bernhard. A study of methods to predict and measure the transmission of sound through the walls of light aircraft. Numerical method for analyzing the optimal performance of active noise controllers.

By Christopher G. Mollo and Robert J. Bernhard. : Christopher G. Mollo and Robert J. Bernhard. In between studs, the sound transmission through a wall that is not reflected or absorbed on the front surface of the drywall becomes structure borne noise which travels through the thickness of the drywall, contributing to sound transmission through a wall.

When the. 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. A study of methods to predict and measure the transmission of sound through the walls of light aircraft By J.

Mickol, J. Bolton, C. Bruer, C. Mollo, B. Gardner and R. Bernhard Abstract. Progress was made in the following areas: development of a numerical/empirical noise source identification procedure using bondary element techniques; identification of structure-borne noise paths using structural intensity and finite element methods; development of a design optimization numerical procedure to be used to study active noise control in three-dimensional geometries; Author: R.

J. Bernhard, J. S. Bolton, B. Gardner, J. Mickol, C. Mollo, C. Bruer.Sound transmission class (STC) provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications.

The STC of a wall is determined by comparing sound transmission loss (STL) values at various frequencies to a standard contour. STL is the decrease or attenuation in sound energy, in dB, of airborne File Size: KB.This drywall product uses special technology that keeps sound waves from penetrating your walls.

It has the same fire-resistant capabilities as regular drywall, but by adding just a single layer to your existing walls, you can take your STC ratings up to an average of Author: Bambi Turner.