Principles of sound control in airplanes
By: [by] Leo L. Beranek, director [and others] Research on sound control, Cruft Laboratory, Harvard University, Cambridge, Massachusetts, under the auspices of Office of Scientific Research and Development, National Defense Research Committee
Published: 1944
Place of publication: Cambridge
Language: eng
Number of pages: 388
Subjects: Airplanes; Soundproofing
Notes: "OSRD no. 1543."

On cover: Restricted.
Table of contents: title: pt I. Estimation and measurement of sound levels in airplanes. Object ; Procedure and apparatus ; Estimation of sound levels and spectra in airplanes ; Measurements of sound levels and spectra in eighteen types of airplanes at normal cruising flight conditions ; Variation of sound levels and spectra as a function of position in the airplane ; Variation of sound levels and spectra as a function of flight conditions ; Variation of sound levels and spectra as a function of different propeller and exhaust conditions ; Variation of sound levels and spectra as a function of wind leaks around doors windows hatches and turrets and of ventilator design ; Variation of sound levels and spectra as a function of altitude ; The effect of noise on communications and psychomotor efficiency; title: pt II. Materials for sound control in airplanes. Object ; Introduction ; Sound transmission through imperious structures ; Sound transmission through absorptive structures ; Sound absorption by various structures ; Sound absorption as a function of the properties of trim cloths ; Flow resistance of fibrous materials; title: pt III. Practical procedures for sound treating airplanes. Introduction ; Factor of basic design affecting sound levels ; Procedure for design of acoustical treatment for flight deck of a hypothetical bomber ; Additional information pertinent to the sound treatment of airplanes ; Conclusions ; Collected computational charts and tables; title: Appendix A : Properties and measurement of sound; title: Appendix B : Apparatus for measuring sound transmission, absorption and flow resistance; title: Appendix C : Tabulation of transmission characteristics for measured acoustical structures; title: Appendix D : Letters of authority (manufacturer's release for data published).