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.
Descriptors:
Subject Categories:
- Marine Engineering
- Mechanics