Accession Number:

ADA429305

Title:

Development of Computational Simulation Tools to Model Weapon Propulsors

Descriptive Note:

Corporate Author:

MASSACHUSETTS UNIV NORTH DARTMOUTH

Personal Author(s):

Report Date:

2004-01-01

Pagination or Media Count:

18.0

Abstract:

The development of computational simulation tools, i.e. finite element FE models, to model weapon propulsors evolves from the need to determine the positive or negative implications for future applications andor design modifications. The propulsor in this case is an electric motor used in such applications as propelling defense mechanisms like torpedoes and acquiring underwater data. The ability to predict, with a computer model, the vibrational and acoustical signatures allows the user to make modifications specific to these applications as well as for performance enhancement. Vibration in an electric motor is the result of electromagnetic force interaction between the rotor and stator. This can be modeled by performing a harmonic analysis by means of a computer simulation. The periodic electromagnetic force loads are reduced to their harmonic components by approximating them with a Fourier Series. The harmonic component loads are then applied sequentially to the computer model, and the results are superimposed. This superimposition yields the displacements in the motor and the pressures in the fluid field surrounding the motor. In addition, natural frequencies and mode shapes are obtained for the motor both in air and underwater.

Subject Categories:

  • Electrical and Electronic Equipment
  • Marine Engineering
  • Numerical Mathematics
  • Acoustic Detection and Detectors
  • Torpedoes
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE