Accession Number:

AD0416375

Title:

CALCULATION OF AERODYNAMIC FORCES ON CYLINDRICAL SHELLS IN UNSTEADY SUPERSONIC FLOW,

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s):

Report Date:

1963-04-01

Pagination or Media Count:

1.0

Abstract:

The aerodynamic forces resulting from the vibra tion of a cylindrical shell of finite length in a supersonic stream have previously been calcu lated using the static approximation. In this the flow field is determined as though it were steady in the state frozen at a given instant. In the present report the static approximation is improved and account is taken of first order effects in vibration frequency. This causes a phase shift between the shell displacement and the corresponding pressure or aerodynamic force coefficient. The phase shift varies with dis tance along the cylinder, the phase angle chang ing very rapidly in the neighborhood of zero of certain modified Bessel functions and remaining sensibly constant in between. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE