86-torsional_vibration_guidelines_-_tdf&clh

86-torsional_vibration_guidelines_-_tdf&clh - Gas...

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Unformatted text preview: Gas Machinery Conference ♦ Nashville, Tennessee GUIDELINES FOR PREVENTING TORSIONAL VIBRATION PROBLEMS IN RECIPROCATING MACHINERY Presented by Troy Feese, P.E. and Charles Hill Engineering Dynamics Incorporated 16117 University Oak San Antonio, Texas 78249 (210) 492-9100 October 7, 2002 i Engineering Dynamics Incorporated • 16117 University Oak • San Antonio, TX 78249 • (210) 492-9100 • FAX (210) 492-9586 • [email protected] Table of Contents 1 Introduction..................................................................................................................................... 1 2 Torsional Modeling of Reciprocating Machinery........................................................................ 2 2.1 Torsional Stiffness.................................................................................................................... 2 2.2 Polar Mass Moment of Inertia.................................................................................................. 4 3 Viscous Dampers............................................................................................................................. 5 3.1 Equivalent Damping and Inertia............................................................................................... 5 3.2 Service Life .............................................................................................................................. 6 3.3 Case History – Broken Engine Crankshaft Linked to Failed Engine Damper ......................... 7 4 Torsionally Soft Couplings............................................................................................................. 8 4.1 Variable Stiffness ..................................................................................................................... 9 4.2 Service Factors ....................................................................................................................... 10 4.3 Case History – Coupling Failure in Variable Speed Reciprocating Compressor System ...... 11 4.4 Case History – Oil Pump Failure............................................................................................ 13 5 Torsional Modeling of Motors..................................................................................................... 14 5.1 Torsional Stiffness.................................................................................................................. 14 5.2 Case History – Effects of Motor Model on Torsional Natural Frequencies........................... 16 6 Shaft Properties ............................................................................................................................ 18 6.1 Shaft Sizing ............................................................................................................................ 18 6.2 Endurance Limits ................................................................................................................... 18 6....
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86-torsional_vibration_guidelines_-_tdf&clh - Gas...

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