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This is Fig. 3 from the 1990 GENOPT paper. Shown in this slide is the normalized weight of the plate (the objective) versus design iterations during a single execution of the GENOPT processor, OPTIMIZE.
The isotropic plate is subject to the following environments, each applied as if it were a separate "event" that occurs during operation of the object of which the plate is a part:
(1) uniform axial compression,
(2) uniform in-plane shear,
(3) uniform normal pressure.
The following behavioral constraints apply:
(I) the maximum effective stress in the plate shall not exceed an allowable value to be specified by the end user;
(2) the plate is not allowed to buckle under the axial compression or under the in-plane shear loads to be specified by the end user;
(3) the minimum natural frequency of the unloaded plate must be greater than an allowable value to be specified by the end user;
(4) the maximum normal deflection of the plate under uniform normal pressure to be specified by the end user shall not exceed an allowable value to be specified by the end user.
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