Accession Number:

AD0601739

Title:

A STUDY OF LONGITUDINAL DYNAMIC STABILITY CRITERIA FOR TORPEDOES,

Descriptive Note:

Corporate Author:

STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB

Personal Author(s):

Report Date:

1963-12-01

Pagination or Media Count:

51.0

Abstract:

The limitations of conventional longitudinal dynamic stability analyses are assessed for the case of a deeply submerged torpedo with a level, straight course equilibrium condition. It is found that the motion equations used previously for stability analyses are valid only when applied to a neutrally buoyant body with the center of gravity directly above or below the center of buoyancy. In other cases, the equilibrium elevator and pitch angles are not zero and this causes certain first order hydrodynamic and inertial terms to appear in the equations which have been ignored in past analyses. The most important of these are hydrodynamic derivatives of vertical force and pitch moment with respect to longitudinal velocity. It is shown that these omissions can cause erroneous predictions of dynamic stability. The results of the study are incorporated in a set of simplified longitudinal stability criteria. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE