scholarly journals Quasi-Steady Approximation of Forces on Flat Plate due to Large-Amplitude Plunging Maneuvers

AIAA Journal ◽  
2018 ◽  
Vol 56 (11) ◽  
pp. 4232-4242 ◽  
Author(s):  
Gino Perrotta ◽  
Anya R. Jones
Keyword(s):  
Flat Plate ◽  
Large Amplitude

scholarly journals Application of Prescribed Velocity Methods to a Large-Amplitude Flat-Plate Gust Encounter

AIAA Journal ◽  
2019 ◽  
Vol 57 (8) ◽  
pp. 3261-3273 ◽  
Author(s):  
Camli Badrya ◽  
James D. Baeder ◽  
Anya R. Jones
Keyword(s):  
Flat Plate ◽  
Large Amplitude

Unsteady Aerodynamic Response of a Flat Plate Encountering Large-Amplitude Sharp-Edged Gust

AIAA Journal ◽  
2021 ◽  
pp. 1-16
Author(s):  
Camli Badrya ◽  
Anya R. Jones ◽  
James D. Baeder
Keyword(s):  
Flat Plate ◽  
Large Amplitude ◽  
Unsteady Aerodynamic

NONLINEAR AERODYNAMIC FORCES ON THE FLAT PLATE IN LARGE AMPLITUDE OSCILLATION

2013 ◽  
Vol 05 (04) ◽  
pp. 1350039 ◽  
Author(s):  
LIN HUANG ◽  
HAILI LIAO
Keyword(s):  
Wavelet Transform ◽  
Flat Plate ◽  
Continuous Wavelet Transform ◽  
Large Amplitude ◽  
Torsional Oscillation ◽  
Continuous Wavelet ◽  
Aerodynamic Forces ◽  
Amplitude Oscillation ◽  
Large Amplitude Oscillation ◽  
Nonlinear Aerodynamic

Nonlinear aerodynamic forces on the flat plate subjected to a forced torsional oscillation of asymptotically varying amplitude at high reduced velocities are investigated by using computational fluid dynamics method integrated with continuous wavelet transform method. The domain decomposition algorithm is used in the numerical simulation to accommodate large amplitude oscillation of plate. The continuous wavelet transform is used to extract the instantaneous amplitude and phase features from the computed time histories of the asymptotically aerodynamic forces on the plate. The results show that the computed characteristics of the aerodynamic forces are in good agreement with the available experimental data. The nonlinear features of the aerodynamic forces are well revealed by the present method.

On nearly-commensurable periods in the restricted problem of three bodies, with calculations of the long-period variations in the interior 2:1 case

1966 ◽  
Vol 25 ◽  
pp. 197-222 ◽  
Author(s):  
P. J. Message
Keyword(s):  
Periodic Solution ◽  
Periodic Solutions ◽  
Large Amplitude ◽  
Restricted Problem ◽  
Small Amplitude ◽  
Minor Planets ◽  
Long Period ◽  
Numerical Integrations ◽  
Period Variations ◽  
The Mean

An analytical discussion of that case of motion in the restricted problem, in which the mean motions of the infinitesimal, and smaller-massed, bodies about the larger one are nearly in the ratio of two small integers displays the existence of a series of periodic solutions which, for commensurabilities of the typep+ 1:p, includes solutions of Poincaré'sdeuxième sortewhen the commensurability is very close, and of thepremière sortewhen it is less close. A linear treatment of the long-period variations of the elements, valid for motions in which the elements remain close to a particular periodic solution of this type, shows the continuity of near-commensurable motion with other motion, and some of the properties of long-period librations of small amplitude.To extend the investigation to other types of motion near commensurability, numerical integrations of the equations for the long-period variations of the elements were carried out for the 2:1 interior case (of which the planet 108 “Hecuba” is an example) to survey those motions in which the eccentricity takes values less than 0·1. An investigation of the effect of the large amplitude perturbations near commensurability on a distribution of minor planets, which is originally uniform over mean motion, shows a “draining off” effect from the vicinity of exact commensurability of a magnitude large enough to account for the observed gap in the distribution at the 2:1 commensurability.

Examination of Rabbit Fc Crystals

1968 ◽  
Vol 26 ◽  
pp. 140-141
Author(s):  
J. P. Robinson ◽  
P. G. Lenhert
Keyword(s):  
Molecular Weight ◽  
Flat Plate ◽  
Phosphate Buffer ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Neutral Ph ◽  
Small Crystals ◽  
Carbon Coated ◽  
Diffraction Patterns

Crystallographic studies of rabbit Fc using X-ray diffraction patterns were recently reported. The unit cell constants were reported to be a = 69. 2 A°, b = 73. 1 A°, c = 60. 6 A°, B = 104° 30', space group P21, monoclinic, volume of asymmetric unit V = 148, 000 A°3. The molecular weight of the fragment was determined to be 55, 000 ± 2000 which is in agreement with earlier determinations by other methods.Fc crystals were formed in water or dilute phosphate buffer at neutral pH. The resulting crystal was a flat plate as previously described. Preparations of small crystals were negatively stained by mixing the suspension with equal volumes of 2% silicotungstate at neutral pH. A drop of the mixture was placed on a carbon coated grid and allowed to stand for a few minutes. The excess liquid was removed and the grid was immediately put in the microscope.

Information and estimation in image processing

1987 ◽  
Vol 45 ◽  
pp. 14-17
Author(s):  
B. Roy Frieden
Keyword(s):  
Image Processing ◽  
Optical System ◽  
Large Amplitude ◽  
Communication Theory ◽  
Image Data ◽  
Direct Approach ◽  
Ill Posed

Despite the skill and determination of electro-optical system designers, the images acquired using their best designs often suffer from blur and noise. The aim of an “image enhancer” such as myself is to improve these poor images, usually by digital means, such that they better resemble the true, “optical object,” input to the system. This problem is notoriously “ill-posed,” i.e. any direct approach at inversion of the image data suffers strongly from the presence of even a small amount of noise in the data. In fact, the fluctuations engendered in neighboring output values tend to be strongly negative-correlated, so that the output spatially oscillates up and down, with large amplitude, about the true object. What can be done about this situation? As we shall see, various concepts taken from statistical communication theory have proven to be of real use in attacking this problem. We offer below a brief summary of these concepts.

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