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

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)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1978
Accession Number
ADA066534

Entities

People

  • N. E. Gilbert

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamics
  • Agreements
  • Aircrafts
  • Applied Mathematics
  • Computational Fluid Dynamics
  • Computational Science
  • Department Of Defense
  • Differential Equations
  • Equations
  • Fluid Dynamics
  • Helicopters
  • Mathematical Models
  • Mechanical Engineering
  • Simulators
  • Steady State
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Mathematics

Readers

  • Aerodynamics.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)