**Preface to "Advances in Bearing Lubrication and Thermal Sciences"**

Bearings are regarded as the "joints"of machines and are the most widely used mechanical components, which directly affect the safe and stable operation of major equipment. During high-speed and heavy-load operation, friction and heat generation increase between rolling elements, cages, and rings. Therefore, in the analysis and evaluation of many bearing properties, "thermal science"has always been regarded as one of the core issues of rolling bearings. Statistics show that about 80% of the failures of rolling bearings are caused by local heating problems. At this time, lubrication technology is becoming the key to reducing bearing friction and wear, enhancing bearing heat dissipation, and extending bearing life.

Over the last century, significant research has been carried out on various aspects of bearing thermal analysis and corresponding lubrication techniques. However, as bearing speeds continue to increase, complex operating conditions present more challenges for bearing thermal analysis. At the same time, the continuous cross-integration of materials, sensors, big data, and emerging technologies have led to the continuous expansion of bearing lubrication technology.

This reprint focuses on the hot issue of bearing lubrication and thermal analysis, and brings together many cutting-edge studies, such as bearing multi-body dynamics, bearing tribology, new lubrication and heat dissipation structures, bearing self-lubricating materials, thermal analysis of bearing assembly process, bearing service state prediction, etc.

> **Ke Yan** *Editor*
