Passenger density is a major factor influencing indoor climate conditions and the corresponding energy consumption in the transfer halls of metro transportation hubs. In this study, passenger flow in a subway transfer hall in Beijing was measured across three typical seasons. A differential equation model was established to account for the characteristics of passenger density. Based on this, a passenger density prediction model was developed and utilized for analysis. The results show that passenger density is primarily affected by operation time and the surrounding population composition, with a relatively weak correlation to outdoor weather conditions. Additionally, passenger density differs significantly between weekdays and weekends, with the weekday peak being 2.5 times higher than that on weekends. During the four peak hours on weekdays, both in the morning and evening, passenger density exceeds the design capacity, resulting in insufficient fresh air supply. However, for most of the weekday hours and for all hours on weekends, passenger density remains below the design capacity. This indicates a substantial potential for energy savings by adjusting the fresh air supply according to actual passenger density.

As the clearance between the rotor and the casing gradually becomes smaller, the probability of collision and friction increases greatly, the rubbing dynamics of the dual disk‐shaft‐bearing system is studied in this paper. Considering the gyro effect of rotor, a dynamic model of the rotor system under nonlinear oil film force is established; the matrices of Timoshenko beam and coupled rigid disk elements are obtained and the rotor support is described by the analytical formula of Capone nonlinear oil film force. Taking the deformation and energy dissipation into account during the rubbing, the rubbing stiffness is characterized by using nonlinear Hertz contact theory. It is innovative to study the mechanism of the rub‐impact dynamics for the rotor system considering the nonlinear oil film force of sliding bearing. The equation of motion for the rotor system is derived to investigate the effect of the rotating speed, the eccentricity, the rubbing clearance, and stiffness on the nonlinear dynamic responses. The results indicate that the rotational speed, the eccentricity, rubbing clearance, and stiffness have significant effect on the nonlinear dynamic behaviors of the dual‐disk rotor with the sliding bearings; the system presents complex dynamic behaviors such as period, multiperiod, quasiperiod, jumping, and paroxysmal chaos. From the perspective of rotor stable operation, there are optimal ranges of the speed, eccentricity, and rubbing parameter, and these parameters should be considered comprehensively to avoid the rotor working in nonlinear motion states such as chaos and quasiperiod. The research work has important guiding significance for the selection of rotor balance accuracy level, design of static gap, and structure optimization.