Norman C. Pardue and Hal Amick
The
focus of this paper will be on laboratory design and issues related to vibration
mitigation based upon the recent experience of Henningson, Durham & Richardson,
Inc. (HDR) and its consultant, Acentech Incorporated, in designing new Advanced
Technology Laboratories (ATLs) for the National Institute of Standards & Technology
(NIST). Issues related to site selection, laboratory plan concepts and details
designed to mitigate environmental vibration will be discussed.
Additional discussions will center on the prototypical research projects undertaken
by HDR/Acentech on behalf of NIST, with particular emphasis on the large,
pneumatically supported inertia slab used to very and refine design concepts
to be employed in the metrology laboratories for the ATL. The scope of the
research surrounding the prototype inertia slab will be discussed, including
the finite element modeling and the vibration measurement program which will
cover measured resonance frequencies and mode shapes. The resulting design
recommendations and parameters developed for large, pneumatically supported
inertia bases will be outlined, including control systems.
Reprinted from NCSL Workshop & Symposium, Dallas, Texas (July, 1995), pp. 553-582