Download or read book Experimental and Theoretical Characterization of the Low Frequency Acoustic Transmission through Centrifugal Pumps written by Guidong Li and published by Scientific Research Publishing, Inc. USA. This book was released on 2024-02-29 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid-dynamic noise in hydraulic systems has gained high attention in the last decades due to the increasing requirements of vibration and noise reduction in many fields. Usually the most significant sound sources in the system are fluid machines such as centrifugal pumps, in which flow pulsations are generated with amplitude that depends on the operating conditions (velocity and flow-rate). The resulting pres-sure fluctuations induced at a given frequency and position along the pipes also depend on the acoustic response of the system, i.e., on how the acoustic pulsations are transmitted or reflected at each system component, including the pump itself. Therefore, the direct meas-urement of pressure pulsations in a pipeline of a test pump does not directly reflect the acoustic properties of the pump itself, because the coupling effects of the hydraulic system, which can even cause standing waves, may be seriously misleading.

Download or read book Acoustic Characterization of a Centrifugal Pump Using a Two port Model microform written by Bardeleben, Michael John Ross and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2005 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of the passive acoustic properties revealed shortcomings in the commonly referenced two-port transmission matrix model. Through a novel data reduction procedure, a dependency on dimensionless specific speed was found to exist in the transmission matrix, which limits the applicability of the lumped parameter model. This was most notable in the capacitance component, where, for pumps having lower specific speeds, the measured values were found to be much less than the predicted values. This limited the success in deriving a theoretical model for the passive acoustic properties of the pump.

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