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DINAME2019
DINAME2019
On the design of a digital filter to compensate for the shaker dynamics in a virtual pipe test rig
Submission Author:
Mauricio Iwanaga , SP
Co-Authors:
Mauricio Iwanaga, Michael Brennan, Oscar Scussel, Fabricio Cesar Lobato de Almeida
Presenter: Mauricio Iwanaga
doi://10.26678/ABCM.DINAME2019.DIN2019-0159
Abstract
The waste of drinking water is one of the main concerns in modern society. Leakages from buried pipe distribution systems is major contributing factor. To help overcome this problem, water industries around the world have put a lot of effort into locating and repairing leaks. Leak-noise correlators are used extensively to find and locate leaks. Although it is considered a straightforward and accurate technique, conventional leak -noise correlators require extensive field tests and training of the personnel in their use. This cost both time and money. A virtual pipe, which is the subject of this paper, could help reduce costs and provide a more consistent way of testing these devices. One way to generate vibration that resembles leak noise as measured on a buried pipe, is to use an electrodynamic shaker. However, a shaker is a dynamic system, and its dynamic behavior could result in contamination of the leak noise related vibration. The aim of this paper is to determine a way to compensate for the shaker dynamics and the associated instrumentation, so that representative pipe vibration due to a leak can be generated in the laboratory. An investigation is carried out into design of a digital filter, which is able to compensate for the shaker dynamics. The approach is first described and then the compensator is placed in series with the shaker, and its efficacy is demonstrated in a laboratory test.
Keywords
Compensator, digital filter, pure delay, buried pipe
