Browsing by Author "Peukert, Pavel"
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- ItemFLOW-INDUCED VIBRATION OF A LONG FLEXIBLE SHEET IN TANGENTIAL FLOW(ACAD SCI CZECH REPUBLIC, INST THERMOMECHANICS, DOLEJSKOVA 5, PRAGUE 8, 182 00, CZECH REPUBLIC, 2018) Šidlof, Petr; Kolář, Jan; Peukert, PavelDuring certain stages of the offset printing process, the paper sheet is conveyed by the blower air. Vibration and acoustic measurements confirmed that under certain circumstances the sheet undergoes flow-induced vibration with significant amplitudes, generating a serious noise source at the same frequency. In order to understand the fluid-structure interaction between the flexible paper sheet and air exiting the nozzles, and to assess the conditions when unstable paper vibration with large amplitudes is possible, a simplified analytical model was developed. The paper sheet, modeled as a flexible 1D chain, is fully coupled to quasi-1D inviscid flow. Under the assumption of small deflections, the coupled equations can be analytically solved in frequency domain, yielding complex eigenfrequencies of the system. For a given flow velocity (corresponding to a specific air pressure setting), the real and imaginary part of the eigenfrequency determines whether the system is stable or unstable.
- ItemNávrh laboratorní parní trati pro testování odběrových sond a výzkum transportu příměsí při varu(Technická Univerzita v Liberci, 2006) Peukert, Pavel; Hrubý, Jan