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.

Differential Evolution with strategy of improved population diversity

Abstract: Differential Evolution (DE) algorithm is well known as a simple and efficient scheme for global optimization over continuous spaces. In order to ameliorate the population diversity, an improved differential evolution (IDE) algorithm is proposed in this paper. The idea is to vary the assembling positions of the premature individuals by mutation operation. It is proved in theory that the direction pointed to the center individual is the reasonable one to improve the diversity. Then the adaptive disturbance scheme after population premature is designed. The example based on the standard function shows that the IDE with good diversity has much better searching capacity and calculating precision in the whole evolution than that of DE.

Ballistic Impact on Woven Glass/Epoxy Composites at High and Low Temperatures

Abstract: This paper investigates the effect of temperature on the ballistic limit of woven glass/epoxy composite panels (6×4×0.25in.) at five different temperatures:−60°C,−20°C, R.T, 75°C and 125°C. The studies were conducted by combining experimental and 3-D dynamic finite element approaches. The specimens tested were made of plain-weave S-2 glass fibers/toughened epoxy. The composite panels were impacted using an in-house gas gun. The time-histories of impact-induced dynamic strains was recorded. The damaged specimens were inspected visually and using the ultrasonic C scan method. A 3-D dynamic finite element (FE) software, with Chang-Chang composite damage model, was then used to simulate the experimental results of the ballistic impact tests. Good agreement between experimental and FE results has been achieved.

Cooperative Task Assignment of Manned /Unmanned Aerial Vehicle Formation in Air Combat

Abstract: Task assignment method plays a key role in manned /unmanned aerial vehicle formation cooperative air combat.Firstly,a task decomposition method with constraint of timing sequential was presented.Then,the task assignment model was established based on the improved Contract Net Protocol(CNP).The task assignment efficiency was enhanced by adopting the acquaintance model.The timing sequence task was processed by adopting the task validity parameter and blackboard mechanism.Finally,simulation was carried out based on the CNP task assignment model,the result shows the well performance of the task assignment method,which can fulfill the requirement of cooperative air combat.

A supersonic V/STOL fighter design project

Abstract: The College of Aeronautics performs an annual group design project as a major part of its Aircraft Design MSc programme. Projects are chosen to be representative of current areas of interest and the programme is carried out in a manner which is as close as possible.to that of aircraft manufacturers. Vice Admiral Forrest S. Peterson, Commander Naval Air Systems Command, said at the AIAA/NASA-Ames V/STOL Conference in 1977 that: V/STOL appeared to be the most effective, most economical means of addressing many of our major military needs: dispersal of air assets over a broad geographic range, reducing the present reliance on relatively few ships and large permanent bases and reducing the cost of maintaining an adequate, efficient air arm.

Discontinuity Effects at the Junction of a Pressurized Cylinder and End Bulkhead

Abstract: An analysis is made to assess the forces and moments arising at the junction of a pressurized circular cylindrical shell and end bulkhead which forms part of a hollow sphere. Expressions are developed for the stress distributions for two cases:(1)When the end bulkhead is joined rigidly and directly to the cylinder.(2)When a jointing ring is introduced at the junction.The necessary and sufficient geometric conditions for the existence of pure membrane stress in the structure are then examined.