Nonlinear dynamic response of a simple ice-structure interaction model

Journal Article · Mon Nov 01 00:00:00 EST 1993 · Journal of Offshore Mechanics and Arctic Engineering; (United States)

DOI:https://doi.org/10.1115/1.2920119· OSTI ID:5647573

Karr, D G; Troesch, A W; Wingate, W C ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Naval Architecture and Marine Engineering

The problem addressed in the continuous indentation of a ship or offshore structure into an ice sheet. The impacting ship or offshore structure is represented by a mass-spring-dashpot system having a constant velocity relative to the ice sheet. The dynamic response of this simple analogue model of ice-structure interaction is studied in considerable detail. The complicated, highly nonlinear dynamic response is due to intermittent ice breakage and intermittent contact of the structure with the ice. Periodic motions are found and the periodicity for a particular system is dependent upon initial conditions. For a representative system, a Poincare map is presented showing the fixed points. A description of some of the effects of random variations in system parameters is also presented. Some implications of these findings regarding structural design for ice interaction are discussed.

• OSTI ID: 5647573
• Journal Information: Journal of Offshore Mechanics and Arctic Engineering; (United States), Vol. 115:4; ISSN 0892-7219
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
OFFSHORE PLATFORMS
DYNAMIC LOADS
IMPACT TESTS
RESPONSE FUNCTIONS
SHIPS
DESIGN
ICEBERGS
IMPACT SHOCK
IMPACT STRENGTH
FUNCTIONS
ICE
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
TESTING
423000* - Engineering- Marine Engineering- (1980-)
420500 - Engineering- Materials Testing