Accession Number:

ADA256450

Title:

Modeling and Control of a Trailing Wire Antenna Towed by an Orbiting Aircraft

Descriptive Note:

Doctoral thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1992-09-01

Pagination or Media Count:

244.0

Abstract:

A model of the dynamics of a long trailing-wire antenna towed behind an orbiting aircraft was developed and then an investigation was made of several candidate schemes to control the wires steady-state shape and oscillations due to wind gradients. A computer simulation was developed using the classic vibrating chain with freefixed boundary conditions superimposed upon the wires steady-state shape and tension distribution. Several forms of restorative and dissipative forces were considered in the analysis. The validity of the superposition approach was demonstrated for a wide operating range. A control law was developed which modulated the towplane orbit radius and demonstrated a potential for a 50 percent or better reduction in all oscillations. A second scheme using a controllable drogue at the trailing end of the wire was investigated. The controllable drogue had a limited success in oscillation reduction, but was found useful in tailoring the steady state shape of the wire. Towed Cable, Towed Wire, Dangling Chain, Vibrating String, Cantilevered Beam, TACAMO.

Subject Categories:

  • Transport Aircraft
  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE