Optomechanics – Voilà. Ivory Analysis Produces Simple Fix


Brutus to Cassius in Julius Caesar:
“There is a tide in the affairs of men which taken at the flood leads on to fortune.  Omitted, all the voyage of their life is bound in shallows and in miseries.”

A product development project might be considered one of “the affairs of men” to which the Bard was alluding.  My readers, however, should note that it was not “the affairs of men” that was Shakespear’s subject.  Rather, it was “a tide” that Brutus’ declaration (and in fact the whole resulting drama) were about.  Shakespear’s prescient observation has outlived him, at 400 years on the 23rd of April, for good reasons.

AEH guided a re-design effort, the goal of which was to markedly reduce the image jitter due to a random vibration excitation.  The client’s analysts had assumed that “structural” damping was uniformly distributed through the system and had some difficulty simulating problems experienced during service.  Fortunately, there was some accelerometer response data from earlier vibration tests and AEH was able to modify the distribution of damping in their Nastran model to better replicate that earlier data. 

AEH added the Optomechanical Constraint Equations (via Ivory) and “Viola,” the model was now able to reproduce the image jitter observed during service as well.  Using the OCE to parse the Nastran displacement vector identified the major contributors and a simple brace was added to the design to stabilize the image.

None of this was planned.  AEH happened to be on-site and overhear a conversation at the coffee pot.  A tide in the affairs of men was forming.  AEH, with Ivory, was ready.  As a wag might say, “Use it or lose it!”

Rejoice with me at William Shakespear’s 400th birthday!

Al H.

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