Prediction of Changes in Modal Properties of the Euler–Bernoulli Beam Structures Due to the Modification of Its Spatial Properties

Abstract

The beams can be considered as fundamental structural elements applied in many technical structures and equipment. In the operating regimes, these beam structures are very often loaded by the time-dependent forces which cause their undesirable dynamical behavior and the whole system is getting into critical resonant state. It is clear that the reduction of the level of unwanted vibrations or prevention of their occurrence should be one of the important objectives in the design of machine equipment and structures. To achieve these aims, the knowledge of modal properties of beam structures in relation to their internal structure is necessary. The insertion of reinforcing core into a beam body is one of the possible techniques to achieve the required changes in modal properties (mode shapes, natural frequencies) of the beam structure. The dependency of the modal properties of structurally modified beam structure on the geometric parameters and material properties of the inserted reinforcing core is studied in this paper.

Influence of geometric parameters and material properties of the reinforcing core on the modal properties of vibrating beam structures

“…One of the possible approaches that can be used to prevent these inappropriate effects, structural treatments in the beam structure need to be done. The techniques of structural modifications [1] applied in this paper, that lead to the modification of beam structure modal properties are based on the use of the reinforcing core inserted into the beam body [2][3][4] and pre-stressing force acting in the axial direction of the beam structure. The computational model, which describes the investigated beam structure, is based on Euler-Bernoulli beam theory.…”