Nonreflective Boundary Design via Remote Sensing and Proportional-Integral-Derivative Control Valve
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 11
Abstract
This paper develops the concept of a nonreflective (or semireflective) boundary condition using the combination of a remote sensor and a control system to modulate a relief valve. The essential idea is to sense the pressure change at a remote location and then to use the measured data to adjust the opening of an active control valve at the end of the line to eliminate or attenuate the wave reflections at the valve, thus controlling system transient pressures. This novel idea is shown here through numerical simulation to have considerable potential for transient protection. Using this model, wave reflections and resonance can be effectively eliminated for frictionless pipelines or initial no-flow conditions and can be better controlled in more realistic pipelines for a range of transient disturbances. In addition, the features of even-order harmonics and nonreflective boundary conditions during steady oscillation, obtained through time domain transient analysis, are verified by hydraulic impedance analysis in the frequency domain.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 11 • November 2011
Pages: 1477 - 1489
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jan 12, 2010
Accepted: Feb 4, 2011
Published online: Oct 14, 2011
Published in print: Nov 1, 2011
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