In recent years, there has been an increased development of high-speed rotating machines that are used in many areas of the economy. In addition to the aircraft and military industries, these machines are widely used, for example, in the automotive industry and in conventional and distributed power engineering. A typical example of these machines are microturbines that can be used to produce electrical energy or drive various devices.

Since turbomachines are getting smaller and smaller, high rotational speeds are required to achieve high power and efficiency. This poses many technical difficulties and requires the use of new methods during the analysis and design process. High speed is the source of various dynamic phenomena regarding the rotor and blades that requires precise study. One of the important issues is also the selection of appropriate bearing systems, which is of paramount importance in oil-free turbomachines that do not use traditional lubricants. Another challenge is to design the dynamic properties of the rotor in such a way as to minimise the vibration level across the entire range of operating speeds. This not only reduces the impact of the machine on the environment but also lowers the load on its bearings and other parts. All applied solutions must ensure stable and silent operation and guarantee high durability and reliability with maintenance limited to the minimum. It is particularly important in the case of high-speed machines, whose rotors often operate above their first critical speeds and have a wide range of permissible operating speeds.

This Special Issue will provide an opportunity for researchers to share their original research and review articles based on current findings in the field of experimental research and dynamic analysis of modern high-speed rotating machines. In particular, we especially welcome papers on innovations in rotor dynamics and vibration control, unconventional bearing systems, and microturbines. Potential topics also include modelling of nonlinear phenomena and fluid-structure interactions. We encourage researchers that use theoretical, experimental, and numerical methods for developing modern rotating machines to participate. Practical case studies that consider the application of new technical solutions in many industrial sectors and advances in high-speed manufacturing are also welcome.

Potential topics include but are not limited to the following:

• Innovations in rotor dynamics
• Microturbines and turbogenerators
• Steam and gas turbines
• Nano, micro and cryogenic machines
• Oil-free turbomachinery
• Unconventional bearing systems
• Adjustable bearings – active lubrication
• New vibration control techniques
• Dynamic stability of rotors at high speeds
• Dynamics of bladed discs
• Modelling of fluid-structure interactions
• Nonlinear phenomena in high-speed rotor applications
• High-speed manufacturing: drilling, turning and milling