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analysis approximation. A model ii developed to simulate impect loeding by the dlstribution of edditionel men to th« eleitic system and subjecting it to e velocity pulse.

COLUMNS

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CYLINDERS

84-171!

Limit Amplifutlea of GaUoping Huff Cylinder*

L.E. Ericsson

Lockheed Missiles & Space Co., Inc., Sunnyvale, CA, AIAA J..22.(4), pp 493-497 (Apr 1984) 11 figs, 20 refs

Key Words: Cylinder*, Ga Hop Ing

An anaJysis is presented for the gelloping in a single degras of fraedom of bluff cross sections. The limit cyde oscille-tion phenomenon Is itudied in particułar, and tha maximum possibla galloping amplituda of an arbitrary cross saction is derived. The thaoratical raauHs ara found to ba in good agreement with available experknental ratulti.

84-1713

Stabflity, Yibratioa and Paaańre Darapiag of Partially Reatrained bnperfect Cołumas

Z. Razzaq, R.T. Voland, H.G. Bush, and M.M. Miku-las, Jr.

NASA Langley Res Ctr., Hampton, VA, Rept. No. NASA TM-85697. 38 pp (Oct 1983)

N84-13608

Key Words: Columns, Neturel frequencies, Oemping

A theoretical and •xperknerrtal study of siender tubular columns for poulble use in space structure* is conducted in the preeence of pertial rotetłonel end restraints. Expiicłt formula* are derłved for computing the buckling load end the lowest neturel freąuency of perfectly straight uniform elastic members with rotationel and restraints poseassing linear moment-rotation characteristłcs. An exect solution in the form of a transcendental aouation, and a numerical solution using secondorder finłte-differences are also presented.

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84-1712

Dynamice! Responae of Bar-Fluid-Shell System Sirnu-litin| Hydranlic Cylinder Subjected to Arbitrary Axia! Eadtetion

L. Tomski and S. Kukla

Inst. of Mechanics and Machinę Design, Technical Univ. of Częstochowa. 42-200 Częstochowa, Poland, J. Sound Vib., 22 (2), PP 273-284 (Jan 22. 1984) 7 figs, 16 refs

Key Words: Cylinder*, Hydraulic system*, Axial excitatlon. Fluid-inducad excttation, Laplaca transformation, Fourier transformat łon

Th# dynamie* of a bar-fluld-shell system simuiatlng a hy draulic cylinder tubjected to arbitrary axial excłtetłon is itudied analyticslly. The technkjues of tha Laplace tren*-form and tha flnKe cosine Fourier transform ara empioyed. The tohitktn expr*seed in the Lepiące trantform domeln i* obtained. Analytkal Solutions for tha forcad harmonie yibrations of tha systam ara głv#n and tha transformad soki-tion for masa kmpact Is invened numerically for large tknę.

84-1714

Tranńent Rewral Yibratioai of a Tiroodienko Cofano Snpported by aa Bestie Hal f-Space

H. Wada

Tohoku Univ., Sendai 980, Japan, Earthquake Engrg. Struć. Dynam.. (2). PP 169-179 (Mar/Apr 1984) 7 figs, 5 refs

Key Words: Columns. Timoshenko theory. Elastic helf-asece, F!exural vibretion

Transient flexural vlbratk>ns of an eiatttc column supported by an elastic half-spaca are inyastigatad analytknlly undar tha oondition that an artołtrarily shapad frea-field lateral scceleretion is ghren as an input. Applying tha Timoshenko theory to tha column and ma king usa of Laplaca transformat łon s with respect to time and numerkal inverse Lepiące trensformetions, the time historie* of the column free end acceleration are presented.

MEMBRANES, FILMS, AND WEBS

84-1715

Acoustic Scattermf by Bafffed Membran et

G.A. Kriegsmann. A. Norris, and E.L. Reiss

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