Chapter 7 Vibration Assessment and Control in Technical Facilities Using an Integrated Multidisciplinary Approach Nicholas Christie, James Hargreaves, Rob Harrison, and Francois Lancelot Abstract Scientific research is advancing rapidly in several fields including materials science, applied physics, life sciences, bio and nanotechnology. This research often brings with it specialist imaging requirements to resolve ever finer details over time. The equipment needed to perform this imaging is often very sensitive to vibration in addition to factors including acoustic coupling, electromagnetic, thermal and airflow effects. This paper discusses the application of end-to-end vibration engineering to address these low vibration challenges. Using measurement data from the site and surrogate locations combined with advanced simulations allows a deeper understanding of the specific project implications and reduces risk and cost. This paper also illustrates how Arup deployed such an integrated multidisciplinary approach to assess and control vibration at the planning and design stages and contributed to the delivery of some of the most advanced scientific and industrial low vibration environment facilities in the world. Keywords Vibration • Technical facility • Laboratory • Assessment • Survey • Mitigation • Foundation • Ground • Structure • Passive control • Active control 7.1 Introduction Microscopy is one of the key aspects of scientific research and is continuously evolving to enable higher resolution powers to be achieved which then enables smaller detail sizes to be resolved. Electron based microscopy has enabled images to be produced for particle, then atomic and, in the future, sub-atomic matter with sub-Angstrom resolution considered to be the state-of-the-art. The performance of the microscope itself, however, depends on the environment within which it is located. This is typically an imaging suite in a university or other research building and while ideally this building would be located in a relatively quiet environment, in reality this is not necessarily possible. Environmental factors that can influence the microscope performance include structural vibration, acoustics, electromagnetic fields, thermal performance and air flow. In this paper the effects of structural vibration on electron and similar microscope performance will be presented and discussed in the context of a new building design. This will include criteria selection, vibration survey methods, modelling and analysis methods to guide the design and vibration mitigation to control or minimize the influence of structural vibration. 7.2 Structural Vibration Structural vibration is vibration that is transmitted through a building structure and eventually arrives at the floor plate structure of the imaging suite and then is transmitted to the microscope equipment. The sources of such vibration are many and varied but can be classified as internal or external. Internal vibration sources are those sources which lie within the N. Christie • F. Lancelot ( ) Arup North America Limited, Advanced Technology & Research, 560 Mission Street, Suite 700, San Francisco, CA, USA e-mail: nicholas.christie@arup.com; francois.lancelot@arup.com J. Hargreaves Ove Arup & Partners UK, Advanced Technology & Research, The Arup Campus, Solihull, UK e-mail: james.hargreaves@arup.com R. Harrison Ove Arup & Partners UK, Advanced Technology & Research, 3 Piccadilly Place, Manchester, UK e-mail: rob.harrison@arup.com © The Society for Experimental Mechanics, Inc. 2017 J. Caicedo, S. Pakzad (eds.), Dynamics of Civil Structures, Volume 2, Conference Proceedings of the Society for Experimental Mechanics Series, DOI 10.1007/978-3-319-54777-0_7 57
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