INTERACTIONS IN RING-SHELL PROJECTOR ARRAYS

Authors
  1. McMahon, G.W.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Acoustic interaction effects can seriously degrade the performance of underwater electro-acoustic arrays in which the elements are small in comparison to a wavelength. The interaction problem is formulated for arrays of monopole elements with piezoelectric drivers. Coefficients for the problem are derived in terms of easily measureable characteristics of a single isolated element. Some results are calculated for line arrays of ring-shell projectors operating near resonance. When the radiation steering direction is at or near broadside to the array axis, interaction effects are not severe, and the steering can be accomplished by simple phasing of the driving voltage. When end-fire steering is used in long line arrays to achieve unidirectional radiation, the interactions are much stronger, and the driving conditions must be carefully controlled to avoid negative conductances.
Report Number
DREA-TM-84-J — Research Note
Date of publication
15 Jun 1984
Number of Pages
57
DSTKIM No
84-02887
CANDIS No
91939
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS;Hardcopy

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