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Experiments on the Active Control of Multiple Wave Types in Fluid Filled Piping Systems

[+] Author Affiliations
M. Baris Kiyar, M. E. Johnson, C. R. Fuller

Virginia Polytechnic Institute and State University, Blacksburg, VA

Paper No. IMECE2002-33041, pp. 161-168; 8 pages
doi:10.1115/IMECE2002-33041
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Noise Control and Acoustics
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Noise Control and Acoustics Division
  • ISBN: 0-7918-3643-6 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

This paper presents active control approaches for the control of structure borne and fluid borne waves in piping installations. At low frequencies the vibration in a fluid filled pipe travels dominantly as a fluid wave, bending waves, a shear wave and a compressive wave in the shell. Although one shell wave may be responsible for the majority of the vibration transmission into supporting structures it is still necessary to control all the waves since discontinuities in the system re-couple all of the wave types. A closed circuit fluid filled piping system, driven by a pump, is used as a test rig. A multi-channel filtered X-LMS feedforward active control system is used to drive a number of electromagnetic actuators attached to the pipe. Reference signal are taken from sensors on the pump and on the pipe. Error signals are taken from accelerometers and pressure sensors on the pipe. Using a set of vibration and pressure sensors both the power flow and amplitudes of the wave types are determined before and after control and the results from various combinations of actuator and sensor locations are presented. It is shown that structural actuators can be used to control all of the wave types.

Copyright © 2002 by ASME

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