Accession Number:

ADA066534

Title:

Steady State Behaviour of a Cable Used for Suspending a Sonar Body from a Helicopter.

Descriptive Note:

Aerodynamics rept.,

Corporate Author:

AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

Personal Author(s):

Report Date:

1978-05-01

Pagination or Media Count:

45.0

Abstract:

A three-dimensional steady state mathematical model of a cable used to suspend a sonar body from a helicopter is derived. Results are presented in dimensionless form for a length of cable totally immersed in any Newtonian fluid, and may therefore be applied to a number of practical problems. Various approximations are made in order to obtain analytical solutions. The suitability of the approximations is investigated by comparing solutions of the general and approximate equations for a uniform fluid velocity. In general, where maximum angular deviations from the vertical are small, agreement is observed to be very good. Two-dimensional power and log laws are assumed for the wind above the sea, and a three-dimensional Ekman spiral is assumed for the sea current. For these non-uniform fluid velocities, the concept of an equivalent mean fluid velocity is used to simplify greatly the presentation of results. Author

Subject Categories:

  • Numerical Mathematics
  • Machinery and Tools
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE