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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 25
ADVANCES IN STRUCTURAL OPTIMIZATION Edited by: B.H.V. Topping and M. Papadrakakis
Paper VII.5
An Inverse Approach to Optimization in Dynamic Deployment of Oceanic Cables J.W. Leonard*, S. Yang* and P.A. Palo#
*Department of Civil Engineering, University of Connecticut, Storrs, United States of America
J.W. Leonard, S. Yang, P.A. Palo, "An Inverse Approach to Optimization in Dynamic Deployment of Oceanic Cables", in B.H.V. Topping, M. Papadrakakis, (Editors), "Advances in Structural Optimization", Civil-Comp Press, Edinburgh, UK, pp 195-201, 1994. doi:10.4203/ccp.25.7.5
Abstract
In the simulation of cable/body deployment
problems, the final state, i.e. predetermined
locations at ocean bottom, are more
restrained than the initial state. Thus,
it was hypothesized that it is possible to
reverse the time integration process, i.e.
given desired coordinates, stresses and
velocities in the final state, small steps
backward in time can be taken and the
values of all variables predicted needed
to achieve that final state. Solving the
cable governing equation backward in time
and space is mathematically ill-posed. The
difficulties in obtaining stable time
decrement solutions are described from
both numerical and physical points of
view. Several approaches are considered
and described. Details are given for the
most successful approach which defines a
well-postulated conjugate problem whose
solution is close to the solution of the
original problem. Three illustrative
examples of the deployment of cable/bodies
from a surface vessel are given to demonstrate
the validity of the method.
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