Vaughn College of Aeronautics and Technology

About: Vaughn College of Aeronautics and Technology is a education organization based out in New York, New York, United States. It is known for research contribution in the topics: Gravitational microlensing & Planetary system. The organization has 727 authors who have published 708 publications receiving 14082 citations. The organization is also known as: College of Aeronautics.

Recognition and test method of cockpit meters based on computer vision

Abstract: Based on the theory of cockpit meters and standard recognize technique, a new recognizing technique that is based on computer vision was proposed. Some key points and the image processing methods were discussed. The homomorphic filter and self-adaption median-value filter were used to perfect the result of image, and the improved Otsu was used to obtain binary image. The improved intersect cortical model(ICM) was used to receive edge of meters, and the pointer was picked up with combining skeleton. Finally, by the max gradient search method, the exact value was obtained. The result shows that this method can quickly get the number of meters, and process the parallel data. Compared with the traditional Hough transform and the least squares fit methods, this method can quicken the recognition process of the pointer and ensure the accuracy and standard of method.

Cowl Shapes of Minimum Drag in Supersonic Flow: Part 2. Newtonian Optima

Abstract: In part 1 of this paper the shape of an axially symmetric ducted body, of given length and fineness ratio, having minimum pressure drag was derived using the Newtonian impact pressure law. It was shown that this shape closely approximated that found by a computer method of Guderley, Armitage and Valentine which employed the general flow equations. Indeed the two curves could be distinguished only for values of the diameter ratio Δ= d i /d f , of the initial and final diameters, so small as to be outside the range likely to be used for cowl shapes.

Gas Flows Generated by Propellant Burning

Abstract: Exact, analytical, solutions to the set of Euler equations augmented by some rather particular forms of source functions are available, and play a useful role in helping to validate numerical solutions of some complex physical problems. As well as providing support for numerical algorithms, such exact solutions can sometimes also help with an understanding of the physics of a real problem. Here, an investigation of a combustion problem illustrates this fact.

A note on the prediction of flying boat take-off

Abstract: It is useful to have available simple prediction formulae for preliminary design work. In the case of landplane take-off such formulae exist, being expressed only in terms of a few major parameters. The flying boat situation is more complex due to the much greater and more variable total drag. By making appropriate assumptions an equivalent formula for flying boat take-off has been derived. Comparison of typical cases of the landplane and flying boat shows that whereas the take-off distance of the former is approximately inversely proportional to thrust/weight ratio to the power of 1·35, in the case of a flying boat it is inversely proportional to the square of thrust/weight ratio.

A New Dynamic-Copula Based Correlated Degradation Feature for Remaining Useful Life Prediction

Abstract: Feature extraction plays an important role in Remaining useful life (RUL) prediction. Feature extraction mainly depends on the performance degradation signal in the previous study, in which the dynamic correlations among different signals are ignored, and the RUL accuracy is affected. A new dynamic feature based on the correlations of the performance degradation signal is proposed. First, dynamic correlation coefficients are calculated by copula function as the multivariate correlation performance degradation features. Second, the random effect Wiener process is used for RUL prediction based on the new features, and the maximum likelihood estimation is adopted to calculate the unknown parameters of the Wiener process. Finally, the RUL estimation for solder joints under vibration load is carried out compared with the quantile and quantile-Principal component analysis (PCA) mixed feature extraction method. The research results show that the proposed method improved the prediction accuracy of RUL.