ANALYSIS ON VIBRATION MODAL OF U-BIMETALLIC FINNED TUBES
MA TengFei
GUO JianYing
SHA FengHuan
Abstract：U-bimetallic finned tube is a new widely used heat exchange component.In order to predict and control the flowinduced vibration damage of U-bimetallic finned heat exchange tubes,their natural frequencies must be calculated accurately.Inplane and out-of-plane vibration modal of U-bimetallic finned tubes were investigated by means of the hammering method and finite element method.The influence of arc bending radius R of U-bimetallic finned tubes on their natural frequencies was analyzed.The finite element simulation results of natural frequencies of U-bimetallic finned tubes were compared with the measured values for free-free boundary condition,the maximum error of the first 18 order frequencies is 7.3％.The natural frequencies of U-bimetallic finned tubes decrease with increasing the arc radius R for clamped-hinged case.
Keywords：U-bimetallic finned tubesVibration modalHammering methodFinite element method
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 787-791 )