Transcription of Notes 9 Torsional Vibrations a (twisted) Overview
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Notes 9 Torsional Vibrations a (twisted) Overview
1459/659 S&V measurementsNotes 9 Torsional Vibrations a (twisted) OverviewLuis San AndresMast-Childs Chair Professor 2019 Torsional Vibrations a (twisted) Overview & Adolfo Delgado, Texas A&M University-Mechanical Engineering Department, January 2018 Contents reproduced (with permission) and adapted from Torsional Dynamic Overview course developed by Brian Murphy Rotating Machinery Analysis, Inc. Copyrighted materialME 459/659 Sound & Vibration Measurements Notes 9 The Basics of Torsional Vibrations3 Torsional vibration is oscillatory twisting of the shafts in a rotor assembly that is superimposed to the running speed. The frequency can be externallyforced, or can be an eigenvalue (natural frequency of the Torsional system). A resonance will occur if aforcing frequency coincides with a natural frequency. Individual turbomachine rotors are usually stiff enough in torsion to avoid typical Torsional excitation frequency range. A typical high speed drive train includes a motor and a gearbox driving rotating machinery through flexible When rotating machines are connectedtogether via shafts or couplings, however, each of the individual rotors can act as a single massive inertia.
driving electric generators or ... • Synchronous electric motors can produce pulsating torque at low frequency during startup. • A system so simple only has a single natural frequency low enough to be excited by the most typical sources of torsional excitation. ... interstage seals and turbine blades Stresses Always results in stress ...
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