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  • 1
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    Unknown
    Differential phonograms (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A new noise measuring method is outlined that is based on electronic analysis of the radiated noise. Non-relevant components are suppressed, while the differential phonogram displayed on the oscilloscope screen discloses the information carrying components. It allows low skilled operators to perform: (1) correct alignment of equipment; (2) detection of incipient failure; and (3) checking of prototypes.
    Keywords: PHYSICS, GENERAL
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 254-258
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Charting environmental pollution (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: It is found that areas affected by different noxious agents are within the limits traced for high noise level areas; consequently, it is suggested that high noise pressure levels should be used as the primary indication of environmental pollution. A complex methodology is reported for charting environmental pollution due to physical, chemical and biological noxious agents on the scale of an industrial district.
    Keywords: GEOPHYSICS
    Type: The 4th Natl. Conf. on Acoustics Vol. 1A (NASA-TT-F-15375); p 192-197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Optimization of the acoustic absorption coefficients of certain functional absorbents (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The sound absorption coefficients of some functional absorbents (mineral wool plates) are determined by the reverberation chamber method. The influence of the angle of inclination of the sound absorbing material with respect to the surface to be treated is analyzed as well as the influence of the covering index, defined as the ratio of the designed area of a plate and the area of the treated surface belonging to another plate. As compared with the conventional method of applying sound-absorbing plates, the analyzed structures have a higher technological and economical efficiency. The optimum structure corresponds to an angle of inclination of 15 deg and a covering index of 0.8.
    Keywords: PHYSICS, GENERAL
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1, C (NASA-TT-F-15376); p 78-82
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Anechoic chamber in industrial plants (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A light anechoic chamber for routine acoustical measurements in the machine building industry is reported. The outer housing of the chamber consists of modules cast in glass fiber reinforced polyester resin; the inner housing consists of pyramidal modules cut out of sound absorbing slates. The parameters of this anechoic chamber facilitate acoustical measurements according to ISO and CAEM recommendations.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: The 4th Natl. Conf. on Acoustic, Vol. 1, C (NASA-TT-F-15376); p 29-31
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Optimizing acoustical treatment (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A mathematical linear programming model is presented for optimizing acoustical treatment and interior decoration of concert and other public halls. This method provides the designer with a range of acoustically correct solutions at increased economical efficiency. The mathematical model uses geometrical data about the room, recommended reverberation time values, the architect's choice of given sound absorbing structures and finishing materials. The model permits inclusion of aesthetical considerations about conditioning, proportioning, or, on the contrary, reciprocal exclusion of any classes of material and/or sound absorbing structure.
    Keywords: PHYSICS, GENERAL
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1, C (NASA-TT-F- 15376); p 7-12
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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