Accession Number : ADA335700

Title :   Wind Tunnel "Free Flight" on a Dynamic Strut

Descriptive Note : Final rept. 1 Sep 93-31 Aug 97

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG

Personal Author(s) : Telionis, D. P.

PDF Url : ADA335700

Report Date : 09 JAN 1998

Pagination or Media Count : 54

Abstract : Work on this project was distributed to various tasks. The first was design construction and calibration of a simple, one degree of freedom model. The second was the development of fuzzy logic software needed to control the motion. The third was appropriate balance systems and dynamic calibration techniques. A roll moment balance system was designed and constructed. The system was mounted to a stepper motor via a shaft which played the role of a roll actuator. The electronic components and software necessary to provide direct feedback were constructed and tested. A computer program was written and tested. As input to the program we employed the reading of pressure transducers connected with a seven hole probe. The desired output was the actual orientation of the probe as well as the static and dynamic pressure. The program was employed to generate static pressure, dynamic pressure and three components of the velocity in terms of the signals obtained by the pressure transducers. To further test this software it was decided to employ a dynamic mechanism which is available and operational. This involved the response of a ship hull to oncoming waves. The fuzzy logic system was trained with data obtained with different wave characteristics and ship incidence. The idea was to train the artificial intelligence system to predict the response of the vessel, namely pitch and roll characteristics to new conditions. More specifically, the ship learns to recognize the condition of the sea it finds itself in. It then predicts how it will respond, if it points in a different direction.

Descriptors :   *WIND TUNNEL TESTS, *ARTIFICIAL INTELLIGENCE, *STRUTS, *FUZZY LOGIC, SOFTWARE ENGINEERING, ROLL, PRESSURE TRANSDUCERS, STEPPER MOTORS, STATIC PRESSURE, DYNAMIC PRESSURE, SHIP HULLS, FREE FLIGHT.

Subject Categories : Aerodynamics
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE