摘要:

ATmatrix is formulated to characterize scattering by a traction‐free periodic rough surface and numerical results for several surface profiles are presented. The normalized reflected intensities are computed, for the cases of longitudinal (P) as well as shear (SV) wave incidence, as functions of the angle of incidence and frequency of the incident wave. The anomalous behavior of the reflected waves are explained in terms of their conversion from evanescent to propagating waves, as well as in terms of Rayleigh surface waves. Hybridization of theT‐matrix scheme with a point‐matching procedure is also discussed.

ISSN:0001-4966    

DOI:10.1121/1.391484

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP

摘要:

We consider a point source above a rough surface, and write the coherent response as the Sommerfeld–Weyl–Noether integral in terms of the coherent plane‐wave reflection coefficientRfor correlated distributions of bosses on rigid or free planes. The uniform asymptotic development of the integral (a generalization of the original Sommerfeld approximation based on the error function complement) is applied to near‐grazing for a rigid base, and graphical results and simple analytical approximations are presented to exhibit the essentials for data inversion programs. The coefficientRand the associated angle‐dependent impedance (determined by the ensemble‐averaged multiple scattering amplitude for one fixed boss) are specified by the single scattered amplitude and the statistical‐mechanics pair distribution function. Low‐frequency illustrations for rigid bosses delineate multipole‐coupling and packing effects on propagation and on attenuation arising from incoherent scattering, as functions of the packing fraction and of the shapes of the bosses and their exclusion regions.

ISSN:0001-4966    

DOI:10.1121/1.391485

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.391487

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.391490

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.391492

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.391496

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.391498

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.391499

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.391500

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.391501

出版商:Acoustical Society of America    

年代:1984

数据来源: AIP