2 edition of Statistical magnifications of sonic booms by the atmosphere. found in the catalog.
Statistical magnifications of sonic booms by the atmosphere.
Robert Franklin Dressler
1966 by Flygtekniska försöksanstalten, Almqvist & Wiksell (distr.) in Stockholm .
Written in English
Bibliography: p. 20.
|Contributions||Fredholm, Nils, joint author.|
|LC Classifications||TL507 .U45 no. 104|
|The Physical Object|
|Number of Pages||20|
|LC Control Number||68136268|
Their theory suggested that body shaping might be able to use the secondary shocks to either "spread out" the N-wave, or interfere with each other to the same end. At very high speeds and altitudes the cone does not intersect the ground, and no boom will be heard. Other maneuvers, such as deceleration and climbing, can reduce the strength of the shock. For steady supersonic flight, the boom is described as a carpet boom since it moves with the aircraft as it maintains supersonic speed and altitude. The practice was condemned by the United Nations.
Buildings in good repair should suffer no damage by pressures of less than 16 pounds per square foot. Nobody has been able to suggest a practical implementation of this concept, as yet. The sound heard on the ground as a "sonic boom" is the sudden onset and release of pressure after the buildup by the shock wave or "peak overpressure. Currently there are no industry-accepted standards for the acceptability of a sonic boom. This effort is identifying and maturing technologies that could eventually enable unrestricted supersonic flight over land by future military and business aircraft, possibly ushering in a new era of supersonic flight.
Consequently the boom will become less intense on either side of the flight track. The boom was produced by a F-4 flying just above the speed of sound at an altitude of feet. An investigation of the effect by Kaneunder conditions of no wind, shows that the lateral extent of the sonic boom at ground level ranges from about 10 to 35 miles on either side of the ground track of the plane. Ground motion resulting from sonic boom is rare and is well below structural damage thresholds accepted by the U. Other maneuvers, such as deceleration and climbing, can reduce the strength of the shock. I did not take it from a copyrighted publication - just his personal reply to me.
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Whitcomb area rule states, we can reuse air displacement without generating additional shock waves. This work is still in preliminary stages and experiments have only been undertaken in wind tunnels Aviation Week and Space Technology, Abatement[ edit ] In the late s when SST designs were being actively pursued, it was thought that Statistical magnifications of sonic booms by the atmosphere.
book the boom would be very large, they could avoid problems by flying higher. Even the ground itself can influence the sound of a sonic boom. This leads to a distinctive "double boom" from supersonic aircraft. Dryden-developed Boom Amplitude and Direction Sensors recorded ground-level sonic boom signature data.
Since the boom is being generated continually as long as the aircraft is supersonic, it traces out a path on the ground following the aircraft's flight path, known as the boom carpet. For example, when sea-level temperature is 58 degrees Fahrenheit, the temperature at 30, feet drops to minus 49 degrees Fahrenheit.
The boom was produced by a F-4 flying just above the speed of sound at an altitude of feet. This eventually doomed most SST projects as public resentment mixed with Statistical magnifications of sonic booms by the atmosphere.
book eventually resulted in laws that made any such aircraft impractical flying supersonically only over water for instance. Using this calculation they found FM's of about 1. For steady supersonic flight, the boom is described as a carpet boom since it moves with the aircraft as it maintains supersonic speed and altitude.
This new technology could open the door to some revolutionary new science. There are theoretical designs that do not appear to create sonic booms at all, such as the Busemann's Biplane. The energy range of sonic boom is concentrated in the 0.
As an aircraft flies at supersonic speeds it is continually generating shock waves, dropping sonic boom along its flight path, similar to someone dropping objects from a moving vehicle.
The Quiet Spike is a telescoping boom fitted to the nose of an aircraft specifically designed to weaken the strength of the shock waves forming on the nose of the aircraft at supersonic speeds.
This means that sonic booms produced by objects moving faster than 1. It is the magnitude of this peak overpressure that describes a sonic boom. The sound heard on the ground as a "sonic boom" is the sudden onset and release of pressure after the buildup by the shock wave or "peak overpressure.
However, with distance, the various shock fronts tend to coalesce into two large shock fronts, usually attributed to the bow and to the tail of the plane. It is a common misconception that only one boom is generated during the subsonic to supersonic transition; rather, the boom is continuous along the boom carpet for the entire supersonic flight.
If the plane makes a sharp turn or pulls up, the boom will hit the ground in front of the aircraft. When this occurs the plane is always ahead of the wave front and the spherical waves emitted at successive points alongthe flight path become tangent to lines sloping backward from the bow of the plane.
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Between andmore than reports of mystery booms were reported along the east coast of the United States, particularly between the regions of New Jersey and Nova Scotia.! Received!4 October! Statistical Theory of Atmospheric Turbulence Effects on Sonic-Boom Rise Times ALLAN D. PIERCE Department of Mechanical Engineering, Massachusetts Institute of.