Resonant characteristics of flow pulsation in pipes due to swept sine constraint

• Autorzy: Pałczyński T.
• Języki publikacji: EN

Abstrakty

EN

A fast and easy to use method for analysing the amplitude frequency characteristics of pulsating flow in pipes with a sine sweep input function is presented. The key element is the sweeping excitation of the pulse generator frequency which generates fast whole-spectrum resonance (from 20 Hz to 160 Hz). A case study describes tests conducted into the applicability of the method for research into pulsating flows. First, the test rig is briefly described, along with the main assumptions of the research. Next, theamplitude frequency resonance dueto swept oscillations is estimated for increasing, decreasing and changeable input mass flow rates. These characteristics are approximated based on a second-order transfer function. Following such assumptions, the damping coefficients and resonance frequencies are estimated. The influence of the direction of the frequency sweep method (increasing or decreasing) on the resultant resonance frequency is also investigated.

Słowa kluczowe

EN

pulsating flow in pipes; sweep sine excitation; amplitude frequency characteristics

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2016
• Tom: nr 133
• Strony: 131--144
• Opis fizyczny: Bibliogr. 10 poz., rys., tab.

Twórcy

autor

Pałczyński T.

• Institute of Turbomachinery, Łódź University of Technology, 219/223 Wólczańska, 90-924 Łódź, Poland

Bibliografia

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• [6] Price S., Smith D.: Sources and remedies of high frequency piping vibration and noise. In: Proc. 28th Turbomachinery Symp., http://www.engdyn.com/images/uploads/84sources_and_remedies_of_high_frequency_piping_vib._and_noise-rev._-_drs&smp. pdf.
• [7] Neapolitano K., Linehan D.: Multiple sine sweep excitation for ground vibrations test. In: Proc. IMAC-XXVII Feb. 9–12, 2009 Orlando, Florida, http://www.atae.com/uploads/2009_8.pdf.
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• [9] Pałczyński T.: A boundary conditions at modeling 1-D pulsating flows in pipes according to the method of characteristics. KONES J. 19(2012), 2, 395–402, http://www.solidworks.com/sw/products/simulation/floxpress.htm at 17.01.2017.
• [10] Pałczyński T.: 1D model of pulsating flows in pipes dynamics using MOC. In: Proc. 13th Int. Conf. Dynamical systems – theory and applications, Lodz 2015, https://www.endevco.com/8510c-15/ at 17.01.2017.