Starved lubrication analysis of angular contact ball bearing based on a multi-degree-of-freedom tribo-dynamic model

Abstract When the oil supply is not adequate to maintain the ideal lubrication, angular contact ball bearing will enter into the starved lubrication regime resulting in the potential performance degradation and consequently the severe failures. To study the effects of starved lubrication on the performance of angular contact ball bearing, this paper first proposes a multi-degree-of-freedom (DOF) tribo-dynamic model by introducing five-DOF inner ring, six-DOF balls, and six-DOF cage. The model considers the starved lubrication in the ball-raceway contact and the full multi-body interactions between the bearing components. With different ball-raceway starvation degrees being analyzed, the effects of starved lubrication on the bearing tribo-dynamic performance are first revealed. By comparison, it is found that the oil film thickness, the skidding performance, and the traction forces in the ball-raceway contact are significantly influenced by the starvation degrees. It is also found that the starvation-induced change of the ball-pocket contact force is dramatical under combined loads, and the maximum contact force under this load condition increases with the increasing starvation degrees

Construction and practice of infection prevention and control system in large Fangcang shelter hospitals

The management team from Ruijin Hospital had successively participated in the design, construction and operation of many Fangcang shelter hospitals. Combined with the large scale of the hospital, large amount of patients and medical wastes, high infection risk of staff, this paper summarizes the experience of our team in the prevention and control work from design of Fangcang shelter hospital, infection prevention and control system and operation process, staff training, health management, medical waste management, which may provide reference for the safe and stable operation of large shelter hospitals