Dynamic stiffness method for free vibration of an axially moving beam with generalized boundary conditions

doi:10.1007/s10483-019-2493-8

Abstract

Abstract: Axially moving beams are often discussed with several classic boundary conditions, such as simply-supported ends, fixed ends, and free ends. Here, axially moving beams with generalized boundary conditions are discussed for the first time. The beam is supported by torsional springs and vertical springs at both ends. By modifying the stiffness of the springs, generalized boundaries can replace those classical boundaries. Dynamic stiffness matrices are, respectively, established for axially moving Timoshenko beams and Euler-Bernoulli (EB) beams with generalized boundaries. In order to verify the applicability of the EB model, the natural frequencies of the axially moving Timoshenko beam and EB beam are compared. Furthermore, the effects of constrained spring stiffness on the vibration frequencies of the axially moving beam are studied. Interestingly, it can be found that the critical speed of the axially moving beam does not change with the vertical spring stiffness. In addition, both the moving speed and elastic boundaries make the Timoshenko beam theory more needed. The validity of the dynamic stiffness method is demonstrated by using numerical simulation.

Key words: plane-stress, crack-tip, anisotropic plastic stress field, general expression, axially moving beam, natural frequency, generalized boundary condition, Timoshenko beam model, dynamic stiffness matrix

2010 MSC Number:

74K10

Hu DING, Minhui ZHU, Liqun CHEN. Dynamic stiffness method for free vibration of an axially moving beam with generalized boundary conditions. Applied Mathematics and Mechanics (English Edition), 2019, 40(7): 911-924.

TrendMD

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