Accession Number : AD0636531

Title :   DIFFRACTION OF PULSES BY OBSTACLES OF ARBITRARY SHAPE WITH A ROBIN BOUNDARY CONDITION. PART A. SEMI-RIGID CASE.

Descriptive Note : Summary rept.

Corporate Author : STATE UNIV OF NEW YORK BUFFALO DIV OF INTERDISCIPLINARY STUDIES AND RESEARCH

Personal Author(s) : Shaw, Richard P.

Report Date : 1966

Pagination or Media Count : 56

Abstract : The potential field and its derivatives (pressure and velocity) resulting from the diffraction of a plane acoustic pulse by an obstacle of arbitrary shape with a Robin boundary condition, is obtained as the solution to an integro-differential equation. The specific geometry of a long cylinder with a square cross section struck longitudinally by a plane pulse is solved for values of the pressure on the scattering surface for the semi-rigid case K > 1. A major portion of the solution is obtained exactly. The remainder involves a numerical approximation of a surface integral by a double summation over specified steps in space and time leading to a weakly coupled set of simultaneous equations at eact time step. Comparison with available exact solutions indicates good agreement. (Author)

Descriptors :   (*SOUND, *DIFFRACTION), (*BOUNDARY VALUE PROBLEMS, DIFFRACTION), INTEGRAL EQUATIONS, DIFFERENTIAL EQUATIONS

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE