Experimental study on the effects of N‐wave sonic‐boom signatures on window vibration

2008 ◽  
Vol 123 (5) ◽  
pp. 3838-3838
Author(s):  
Yusuke Naka ◽  
Yoshikazu Makino ◽  
Takeshi Ito
Keyword(s):  
Experimental Study ◽  
Sonic Boom ◽  
N Wave

scholarly journals Experimental study of the impact of N-wave on heat transfer in a boundary layer of a flat plate at the Mach number 2

2021 ◽  
Author(s):  
V. L. Kocharin ◽  
A. A. Yatskikh ◽  
D. S. Prishchepova ◽  
A. V. Panina ◽  
Yu. G. Yermolaev ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Experimental Study ◽  
Mach Number ◽  
Flat Plate ◽  
N Wave ◽  
The Impact

Measured N-wave sonic boom events and sensitivity in sonic boom metrics

2015 ◽  
Author(s):  
Joshua Palmer ◽  
Victor W. Sparrow
Keyword(s):  
Sonic Boom ◽  
N Wave

Lift Produced by a Sonic Boom

1963 ◽  
Vol 67 (636) ◽  
pp. 796-796 ◽  
Author(s):  
A. Sigalla
Keyword(s):  
Pressure Field ◽  
Radial Distance ◽  
Wave Pattern ◽  
Technical Note ◽  
Sonic Boom ◽  
Velocity Perturbation ◽  
Flight Direction ◽  
Apparent Inconsistency ◽  
N Wave ◽  
Asymptotic Forms

The Technical Note by C. H. E. Warren in the September Journal raises a question on the transfer of lift, of an aeroplane in supersonic flight, to the ground. This problem was considered in reference 2. It was shown that, as expected, the resultant of the pressure field produced by the aeroplane is equal to its lift. This apparent inconsistency with the N-wave pattern, predicted by Whitham stems from the fact that most applications of Whitham's theory are based on asymptotic forms for the velocity perturbations. Thus, the formula for the axial velocity perturbation is obtained by allowing (M2— l)l/2r/y to tend to infinity, where M is the flight Mach number, r the radial distance away from the aeroplane, y=x—(M2 — l)1/2, and x is the distance along the aeroplane flight direction. This approximation is valid in the vicinity of the shock waves emanating from the aeroplane.

Recent Developments in Sonic-Boom Simulation Using Shock Tubes

1974 ◽  
Vol 52 (3) ◽  
pp. 207-218 ◽  
Author(s):  
J. J. Gottlieb ◽  
I. I. Glass
Keyword(s):  
Shock Tube ◽  
The United States ◽  
Sonic Boom ◽  
Practical Case ◽  
Shock Tubes ◽  
Constant Area ◽  
Recent Developments ◽  
Tube Type ◽  
Societal Problems ◽  
N Wave

Gasdynamic and acoustic analyses were performed in order to provide greater insight into the operation of sonic-boom simulators utilizing shock-tube drivers. Three basic shock tubes were considered; each had a pyramidal driver joined at the diaphragm station to a pyramidal channel of the same divergence angle (pyramidal shock tube), or of a different angle, or joined to a constant-area channel. Classical acoustic theory was applied to obtain new analytical solutions to describe the wave motion in such facilities, in agreement with experimental data. In addition, a detailed study of the nonlinear generation and propagation features of the N wave was made for the important and practical case of the pyramidal shock tube. The work described above is of current interest as shock-tube-type facilities are in present use in France, Germany, England, the United States, and Canada to assess societal problems associated with sonic boom.

scholarly journals Computational and Experimental Study of Plume and Shock Interaction Effects on Sonic Boom in the NASA Ames 9x7 Supersonic Wind Tunnel

2018 ◽  
Author(s):  
Courtney S. Winski ◽  
Melissa B. Carter ◽  
Alaa A. Elmiligui ◽  
Jason M. Pearl ◽  
Sudheer N. Nayani ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wind Tunnel ◽  
Interaction Effects ◽  
Sonic Boom ◽  
Shock Interaction ◽  
Supersonic Wind Tunnel

Experimental study of sonic boom acceptance

1993 ◽  
Author(s):  
Ayano Tokuyama ◽  
Kenji Sakai ◽  
Hideto Taya
Keyword(s):  
Experimental Study ◽  
Sonic Boom

The Effects of Sonic Boom on the Ecological Environment

1980 ◽  
Vol 33 (2) ◽  
pp. 296-303
Author(s):  
C. Cerri
Keyword(s):  
Thermodynamic Characteristics ◽  
Sonic Boom ◽  
Pressure Jump ◽  
Minor Importance ◽  
Supersonic Transport ◽  
Wave Signature ◽  
Image Position ◽  
The Uk ◽  
Break Even Point ◽  
N Wave

It is expected that the number of military and civil aircraft operating supersonically all over the world may remain the same during the next decade. The problem of sonic boom, which has been by-passed for military aircraft through the assignment of specially allocated ranges for supersonic operation, is still with us and is likely to influence the operation of supersonic transport (SST) aircraft, the Concorde and the Tupolev 144. Concorde is still short of reaching the break-even point, despite the large traffic gain registered on the routes to North and South America. The problem is to get overland routes; the difficulties encountered by the UK in the discussions with India and Malaysia for the establishment of a London–Bahrain–Singapore route are well known.Before presenting the effects of the sonic boom on the ecology it may be well to summarize the nature and the main features of this phenomenon.(i) The N-wave signature. A complex body like an aircraft, moving in supersonic flight, generates a pattern of local shock waves which tend to coalesce in two main shock cones, the front (or bow) and tail, as the distance from the aircraft increases. A shock wave is a discontinuity surface for the thermodynamic characteristics of the fluid, the most important being the static pressure jump responsible for the N-shaped pressure signature characteristic of the sonic boom. Other parameters are of minor importance to the environment. A shock signature is denned by the following parameters:

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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