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) : Clifton, James M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a256450.pdf


Report Date : Sep 1992


Pagination or Media Count : 244


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 wire's steady-state shape and oscillations due to wind gradients. A computer simulation was developed using the classic vibrating chain with free/fixed boundary conditions superimposed upon the wire's 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.


Descriptors :   *TRANSPORT AIRCRAFT , *AIRCRAFT ANTENNAS , *TRAILING WIRE ANTENNAS , CONTROL , SIMULATION , STEADY STATE , ORBITS , AIRCRAFT , MODELS , DISTRIBUTION , COMPUTERS , DYNAMICS , WIRE , SHAPE , WIND , CABLES , REDUCTION , BOUNDARIES , CHAINS , TENSION , AIR TOWED , APPROACH , GRADIENTS , OSCILLATION , ANTENNAS


Subject Categories : Transport Aircraft
      Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE