Mark,
Last time this was discussed I was interested in the nature of the feedback.
When one runs the studies twice one learns about the stiffness of the surrounding structure. That is, where the preload needs to be increased more to achieve the desired preload implies lower surrounding structural stiffness (or modelling error or design error).
Do you know whether the new preload input required for desired preload output will be published to the summary files?
Thanks
Charles