摘要:

Present‐day estimates regarding the acceptability of sonic booms by man are derived from various observations, overflight programs, and experimental field and laboratory studies conducted both within and outside the United States. The loudness and annoyance of individual booms and their dependence on the boom overpressure and pressure‐time function as well as the complex reaction of individuals, groups, and communities exposed to sonic booms of varied magnitude and frequency are discussed. The few experiments available proving that even sonic booms of the maximum intensity presently feasible do not produce direct medical injury are described. Based on the integrated body of results of recent physiological, psychoacoustic, behavioral, and sociological studies in various countries, estimates of the effects and acceptability of regular, frequent supersonic commercial overland flight schedules are presented and discussed in terms of aircraft noise pollution in general, and of potential certification of aircraft with respect to noise and sonic boom. Findings support the current policy that commercial supersonic transport aircraft will not be permitted to fly over the United States unless and until the noise factors are brought within acceptable limits.

ISSN:0001-4966    

DOI:10.1121/1.1912909

出版商:Acoustical Society of America    

年代:1972

数据来源: AIP

摘要:

The paper summarizes the sonic‐bang studies that have been made in the United Kingdom since 1965, which embrace flight trials, field experiments, and laboratory studies. The main flight trial concerns the measurement of the sonic bang from the Concorde. It is shown that, when the Concorde is flying at 45 000 ft, the waveform at the ground has attained its farfieldN‐wave shape, although this is not quite so when it is flying at 37 000 ft. The measured characteristic overpressures for these two altitudes and a Mach number of 1.3 are 110 N/m2and 120 N/m2, respectively. The effects of sonic bangs on cathedrals are discussed and the vibrational responses likely to be induced by the sonic bang are compared with those already arising from other environmental causes. Finally, the results of a study of the effects of simulated sonic bangs on some greenhouses are discussed; these results seem to indicate that most damages can be ascribed to a triggering effect.

ISSN:0001-4966    

DOI:10.1121/1.1912910

出版商:Acoustical Society of America    

年代:1972

数据来源: AIP

摘要:

This paper reports the results of a field experiment initiated by the Division of House Construction at Chalmers' University of Technology in connection with the Swedish Aeronautical Research Institute, whose primary aim was to study boom exposure effect on structures. Military aircraft were used which flew over a test area generating sonic booms of various intensities. Test persons were exposed directly under the flight path, the exposure effect being measured with the aid of a visual performance test and a tracking test. In addition, the subjective reactions of the test persons and military recruits, present at other sites under the sonic‐boom carpet, were evaluated with the aid of a questionnaire.

ISSN:0001-4966    

DOI:10.1121/1.1912911

出版商:Acoustical Society of America    

年代:1972

数据来源: AIP