THE MECHANICAL SELF RESISTANCE AND THE MECHANICAL MUTUAL RESISTANCE OF AN UNBAFFLED RIGID DISK (ka<1) RADIATING SOUND FROM A SINGLE FACE INTO AN ACOUSTIC MEDIUM

摘要

The acoustic radiation properties of an unbaf-fled, rigid, oscillating disk (ka < 1) are reviewed in the light of Gutin's theory of superposition and Bouwkamp's analysis. Two such unbaffled, rigid pistons are placed in juxtaposition in a plane and are driven with equal velocity amplitude. Formu¬las for the radiation characteristic and mechanical radiation resistance of the pair as a function of separation distance d are derived. From these formulas the mechanical self-resistance coefficient and the mechanical mutual resistance coefficient for separation distance up to kd = 25 are deduced. Tables of self and mutual radiation resistance for an unbaffled, rigid disk are computed out and printed in the appendix.