Dynamics of moving coupled objects with stabilizers and unconventional couplings

• Published in: Journal of sound and vibration 2024-02, Vol.570, p.118020, Article 118020
• Main Authors: Stojanović, Vladimir, Deng, Jian, Milić, Dunja, Petković, Marko D.
• Format: Article
• Language: English
• Subjects: D-decomposition method; Dynamic stability; Principle of argument; Vibrations
• ISSN: 0022-460X; 1095-8568
• DOI: 10.1016/j.jsv.2023.118020

•Dynamics and stability of coupled bogies with specific couplings and stabilizers are analyzed.•Complexly modeled flexibly supported infinite coupled beam-layer reaction is used.•The improved version of Principle of Argument and D-decomposition method is discussed.•New phenomena of effect of change the viscous damping in coupling has been discovered.•The technical solutions of specific couplings are presented, and their benefits are discussed. A comprehensive investigation was carried out to analyze the vibration stability of a coupled bogie system moving uniformly along a complexly modeled flexibly supported infinite high-order shear deformable coupled beam system on a viscoelastic base. The main contribution of this study involves a comparative analysis of the specific coupling of the bogie system with and without the proposed additional stabilizer, in comparison to conventional cases. The study demonstrates significant benefits of the newly proposed options of dual coupling and additional stabilizers in terms of stability. Another contribution of the study is the feasibility of the proposed unconventional models in technical practice. A phenomenon has been discovered that increasing the viscous damping in a special coupling leads to the occurrence of motion instability in the mechanical system. The paper also presents a novel technical solution for connecting moving objects at high speeds. The benefits of the additional oscillator as a stabilizer are extensively illustrated through numerous different examples. It is well-known that when the velocity of masses, such as the bogie or any other complex oscillator, exceeds the minimum velocity at which waves propagate in the beam, the oscillation of the system may become unstable. Therefore, it is crucial to determine the conditions and stable regions of motion that involve specific combinations of system parameters. The region of instability is identified within the parameter space of the system using the D-decomposition technique and the argument principle. The bogie is specifically connected to another bogie in two new ways: with an additional stabilizer allowing double transverse displacement and providing an additional contact with the base, or with a specific coupling that enables simultaneous rotational and transverse displacement at the contact point. The analysis reveals two key findings. First, the additional mechanical stabilizer allows for the widest range of permissible suspension stiffness (lar