Astronautical Engineering Research Articles

A new displacement-type stability equation and general stability analysis of laminated composite circular conical shells with triangular grid stiffeners

In this paper, based on the theory of Donnell-type shallow shell, a new displacement-type stability equations is first developed for laminated composite circular conical shells with triangular grid stiffeners by using the variational calculus and generalized smearedstiffener theory. The most general bending stretching couplings, the effect of eccentricity of stiffeners are considered. Then, for general stability of composite triangular grid stiffened conical shells without twist coupling terms, the approximate formulas are obtained for critical external pressure by using Galerkin's procedure. Numerical examples for a certain C/E composite conical shells with inside triangular grid stiffeners are calculated and the results are in good agreement with the experimental data. Finally, the influence of some parameters on critical external pressure is studied. The stability equations developed and the formulas for critical external pressure obtained in this paper should be very useful in the astronautical engineering design.

Defense to Double Fellowship Grants

The Department of Defense will award in April 1989 about 150 new 3‐year graduate fellowships, in addition to the 140 grants already scheduled under the $10 million National Defense Science and Engineering Graduate Fellowship Program. DOD started the program from concern that a declining number of U.S. citizens are pursuing advanced degrees in science and engineering fields important to national defense, according to the news release announcing the awards.Fellowships go to students working toward doctoral degrees in aeronautical and astronautical engineering, biological sciences, chemical engineering, chemistry, cognitive, neural and behavioral sciences, computer sciences, electrical engineering, geosciences, manufacturing sciences, materials sciences, mathematics, mechanical engineering, naval architecture and ocean engineering, oceanography, physics, and toxicology.

Dynamic Response of a Laminated Plate With Friction Damping

A sandwich-type plate with metal facings and felt core, fastened by bolts, was studied using both test and finite-element analysis. This type of plate is cheap, light, damping-effective and without pollution; therefore, it is widely used in astronautical engineering. The tests were conducted for different felt thicknesses, bolt numbers, and fastening forces. The results show that the damping depends on friction between the plates and the felt. As compared with an identical stiffness solid plate, the damping of laminated plates can be increased up to 30 times. A mesh with rectangular elements was adopted in the finite-element analysis. In accordance with the slipping mechanism, a rectangular plate clamped on one edge was analyzed with the foregoing elements to determine the resonant frequency and the damping. The difference between the calculated and tested results was within 5 percent for the resonant frequency.

An engineering survey of radiating shock layers.

John Anderson received his Bachelor of Aeronautical Engineering Degree from the University of Florida in 1959 and his PhJD. in Aeronautical and Astronautical Engineering from Ohio State University in 1966. From 1959 to 1962, Dr. Anderson served as a Lieutenant and Task Scientist in the U.S. Air Force at the Aerospace Research Laboratories, Wright-Patterson Air Force Base, Ohio. At Ohio State University from 1962 to 1966, he studied under National Science Foundation and NASA graduate fellowships. Since 1966, Dr. Anderson has been Chief of the Hypersonics Group, Aerophysics Division, at the U.S. Naval Ordnance Laboratory, White Oak, Maryland. Also since 1966, he has been a Lecturer in the Mechanical Engineering Department at Catholic University. Dr. Anderson is a member of Tau Beta Pi, Sigma Xi, Sigma Tau, AIAA, and the American Physical Society. He has published in the areas of radiation gas dynamics, high-temperature nonequilibrium flows, and hypersonic aerodynamics. In science, by a fiction as remarkable as any to be found in law, what has once been published, even though it be in the Russian language, is spoken of as known, and it is too often forgotten that the rediscovery in the library may be a more difficult and uncertain process than the first discovery in the laboratory.)J Lord Raykigh—1884

Astronautical Engineering and Science

Astronautical Engineering and Science

Astronautical Engineering and Science, from Peenemunde to Planetary space. Edited by E. Stuhlinger, F. I. OrdwayIII, J. C. McCall, G. C. Bucher. McGraw-Hill Book Co., London. 1963. 394 pp. Illustrated. £6 15s. 6d.

Astronautical Engineering and Science, from Peenemunde to Planetary space. Edited by E. Stuhlinger, F. I. OrdwayIII, J. C. McCall, G. C. Bucher. McGraw-Hill Book Co., London. 1963. 394 pp. Illustrated. £6 15s. 6d. - Volume 67 Issue 635

Handbook of astronautical engineering. Edited by H. H. Koelle. McGraw-Hill, London. 1961. Approx. 1,500 pp. (Sect, pag.) £10 13s. 6d.

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