Accession Number:

ADA250404

Title:

Draft of Manuscript Submitted to Society of Naval Architects and Marine Engineers Annual Meeting, November 1992

Descriptive Note:

Corporate Author:

MARYLAND UNIV COLLEGE PARK DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1992-01-01

Pagination or Media Count:

52.0

Abstract:

Commonly perceived problems associated with the Dynamic Design Analysis Method include the following a transient dynamic analysis is both a unique and better solution if a structure has repeated fixed base frequencies DDAM fails to account for them if a structure has two fixed base modal frequencies very close to each other, the beating response is so long in time that the combinatorial rules for response are not realistic and a very small appendage attached to a larger component can cause erroneous values in shock inputs. Basic concepts and terminology associated with normal mode analysis are presented to demonstrate their role in DDAM, along with a procedure for developing transient equipment-vehicle models for some simple systems that produce time history responses that are different, and yet, equivalent to the damaging potential of a DDAM input. Having developed this background, the perceived problems with DDAM are examined by means of examples which should help to clarify these notions.

Subject Categories:

  • Marine Engineering
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE