| Popis: |
This chapter describes the theories and derives the equations that are the foundations of theoretical aero- hydroacoustics principally relating to subsonic flow and its excitation of elastic surfaces. The chapter will explore the common relationships of simple linear acoustic theory, emphasizing the fundamental qualities of single-pole and multipole source types. The general theory of fluid-induced noise generation, including theory of vortex-generated sound in low-speed (low Mach number) flow, is also derived with considerable attention given to the classification of source types and noise mechanisms as well as to the influences of solid boundaries of various types on radiated intensity. |
