This cluster of papers focuses on the monitoring, analysis, and control of vibration propagation in vehicles, particularly related to welding techniques, steel structures, micro-jet cooling, laser welding, surface tension effects, electromagnetoelastic transducers, fatigue analysis, vehicle suspension systems, and applications of nanotechnology. The research covers a wide range of topics related to the impact of material properties, welding methods, and cooling techniques on vibration modes and propagation in automotive and mechanical systems.