64 N. Christie et al. 1.00E-10 1 10 1.00E-09 1.00E-08 1.00E-07 VC-A VC-B VC-C VC-D VC-E VC-F VC-G 1% exceedance: Vertical 1% exceedance: Vertical: Keel slab 1% exceedance: Vertical: Active Isolation 1 1% exceedance: Vertical: Active Isolation 2 RMS Velocity (m/s) 1/3rd Octave Centre Frequency (Hz) 1.00E-06 1.00E-05 1.00E-04 1.00E-03 Fig. 7.9 Predicted effect of active control system using measured bore hole vibration 7.7 Summary Successful technical facility design involves the management of internal and external sources of vibration from the start of the project, through the design stages and on to completion. The site vibration performance is one of the fundamental inputs to the vibration engineering aspects of the project and requires specific methods, equipment and results interpretation to enable advice of value to be provided. Computational methods are another important aspect of the design process which enables the structural vibration performance to be evaluated and compared with the criteria at the design stage. Examples have been presented of how FEA has been applied to footfall induced vibration on suspended slabs and, in conjunction with survey data, how a foundation design should be checked for vibration performance. An overview of passive and active vibration control has been provided and an illustration of how passive and active control can enhance structural vibration has been given. References 1. 2015 ASHRAE Handbook, Heating Ventilating and Air-Conditioning Applications SI Edition 2. Institute of Environmental Sciences and Technology, IEST-RP-CC012.2 Considerations in Cleanroom Design (2007) 3. Amick, H., Gendreau, M., Busch, T., Gordon, C.: Evolving criteria for research facilities: I – vibration. Reprinted from SPIE Conference 5933: Buildings for Nanoscale Research and Beyond, San Diego, CA, 31 July 2005 to 1 August 2005 4. Manchester Engineering Campus Development (http://www.mecd.manchester.ac.uk/) 5. Willford, M., Young, P.: A Design Guide for Footfall Induced Vibration of Structures. Concrete Centre, December (2006) 6. Murray et al. Structural Design Guide – Section 11. American Institute of Steel Constructors (1997) 7. www.oasys-software.com/GSA 8. ANSI-S1.11: Specification for Octave-Band and Fractional-Band Digital Filters. American National Standards Institute 9. Amick, H., Xu, T., Gendreau, M.: The role of buildings and slabs-on-grade in the suppression of low-amplitude ambient ground vibrations. In: 11th International Conference on Soil Dynamics & Earthquake Engineering 10. Lysmer, J., Kulmeyer, R.L.: Finite dynamic model for infinite media. J. Eng. Mech. ASCE. 95, 859–875 (1969) 11. MSC.NASTRAN v2014 User Manual 12. Richart, F.E., Hall, J.R., Woods, R.D.: Vibration of Soils and Foundations. Prentice-Hall, Englewood Cliffs (1969)
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