Browsing by Author "Lato, Thomas"

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Control of resonant excitation in piping systems
(9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise, 2018) Lato, Thomas; Mohany, Atef
Acoustic resonance is a phenomenon which is known to have severe repercussions in a variety of industrial systems. Acoustic resonance can cause high levels of vibrations leading to damage or premature failure of critical components. Although acoustic resonance affects a broad spectrum of industrial equipment, piping systems will be of focus in this work. Both passive and active damping techniques were previously investigated. However, there is a need to investigate the practicality of such devices when implemented in industrial systems. Herschel-Quincke (HQ) tubes have been selected for experimental study throughout this work. The experimental setup consists of an open-air loop pipeline system which is capable of exciting a standing wave with a fundamental frequency of 30 Hz and a target dominant fifth mode of 150 Hz. Transmission loss measurements were performed by means of the two source-location method. Insertion loss measurements were performed with a straight pipe used as the baseline. The current work has shown that Herschel-Quincke devices have potential for practical implementation into resonant piping systems in industry.
An energy-regenerative suspension system
(ASME, 2018) Lato, Thomas; Zhao, Huiyong; Zhao, Lin; He, Yuping
Passive damping mechanism of Herschel-Quincke tubes for pressure pulsations in piping systems
(2018-12-01) Lato, Thomas; Mohany, Atef
The acoustic pressure pulsations in industrial piping systems can induce fluctuating loads on inline equipment which may cause fatigue failure and in severe cases, initiate a phenomenon known as acoustic resonance. Passive damping devices such as the Herschel-Quincke (HQ) Tube can be implemented into a resonant system to mitigate the pressure pulsations. Some practical considerations have been clarified in the current work which include the normalization of the transmission loss with respect to the HQ tube to pipeline diameter ratio and the change in attenuation when placing an HQ device at different locations along the standing wave formed in the pipeline. The attenuation mechanism of the HQ device was clarified for the application to resonant piping systems. It was found that the second acoustic mode of an open-open pipe is excited within the device. A Computational Aeroacoustic simulation was performed to visualize the acoustic state variables within the HQ device.