Abstract
One obvious limitation of the traditional force
identification techniques is that they are unable to
obtain the explicit expression of the force. Moreover,
some techniques need both the displacement and velocity
data of all freedoms, and some need the Markov
parameters from numerical calculation or experimental
test before the force identification can be carried
out. This paper presents a genetic programming (GP)
based method for excitation force identification of
dynamic systems to overcome these traditional methods'
disadvantages. GP is employed as a search and
optimisation method to obtain the optimal, if not the
best, force expression from the known dynamic response.
One obvious merit of the proposed method is that it can
obtain the explicit expression of the unknown force.
Another advantage is that it only needs the dynamic
response data at one point, i.e. displacement or
velocity or acceleration of one freedom. Illustrative
examples demonstrate that the GP based method is able
to identify the excitation force of a single-degree, a
three-degree dynamic systems and a frame structure,
depicting its potential for force forecast problems.
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