Towards Highly Efficient, Additively Manufactured Passive Vibration Eliminators for Mechanical Systems.

Structural damping largely determines the dynamic properties of mechanical structures, especially those whose functioning is accompanied by time-varying loads. These loads may cause vibrations of a different nature, which adversely affects the functionality of the structure. Therefore, many studies have been carried out on vibration reduction methods over the last few years.

Changes in Frequency and Mode Shapes Due to Damage in Steel-Concrete Composite Beam.

This study presents an analysis of changes in the vibration frequency and mode of vibration of a composite beam due to damage. A steel-concrete composite beam was considered, for which numerical analysis (RFE model) and experimental tests were conducted. Two levels of damage were introduced to the beam.

Rigid Finite Element Method in Modeling Composite Steel-Polymer Concrete Machine Tool Frames.

At the stage of designing a special machine tool, it is necessary to analyze many variants of structural solutions of frames and load-bearing systems and to choose the best solution in terms of dynamic properties, in particular considering its resistance to chatter. For this reason, it is preferred to adopt a low-dimensional calculation model, which allows the user to reduce the necessary calculation time while maintaining a high accuracy. The paper presents the methodology of modeling the natural frequencies, mode shapes, and receptance functions of machine tool steel welded frames filled with strongly heterogenous polymer concrete, using low-dimensional models developed by the rigid finite elements method (RigFEM).

Increasing Damping of Thin-Walled Structures Using Additively Manufactured Vibration Eliminators.

The paper presents a new way to conduct passive elimination of vibrations consisting of covering elements of structures with low dynamic stiffness with polylactide (PLA). The PLA cover was created in 3D printing technology. The PLA cover was connected with the structure by means of a press connection.

Finite Element Modeling of the Dynamic Properties of Composite Steel-Polymer Concrete Beams.

This paper presents a method for modeling the dynamic properties of steel-polymer concrete beams, the basic structural components of machine tools, assembly lines, vibratory machines, and other structures subjected to time-varying loads during operation. The presented method of modeling steel-polymer concrete beams was developed using the finite element method. Three models of beams differing in cross-sectional dimensions showed high agreement with experimental data: relative error in the case of natural frequencies did not exceed 5% (2.

Analysis of Surface Geometry Changes after Hybrid Milling and Burnishing by Ceramic Ball.

The production of modern machines requires parts with much greater geometric accuracy and surface geometry (SG) precision than several years ago. These requirements are met by so-called hybrid technologies that must simultaneously be inexpensive to implement. The integration of treatment procedures (usually in one operation) is geared towards achieving a synergistic effect.