Kongshu Deng

Based on the engineering challenge of dynamic stability control for shield propulsion systems under complex geological conditions, this study aims to address two critical issues: adaptive optimization of nonuniform configurations during multi-ring continuous tunneling and long-term stability evaluation. By establishing a segmented progressive reconfiguration mechanism with the core constraint of minimizing phase angle adjustment quantities between adjacent configurations, analytical optimization algorithms achieve rapid and energy-efficient switching of nonuniform layouts. Simultaneously, this work innovatively proposes the Thrust Stability Coefficient ( TSC ). A quantitative dynamic stability evaluation model is developed by coupling the discrete characteristics of thrust variation coefficients with their mean levels. Numerical simulations and field validation demonstrate: The nonuniform thrust system reduces TSC values by 85%, while the overall TSC at the Duesseldorf WHL Metro Project in Germany is further reduced by 70% during continuous construction. Adams virtual prototype simulations validate the effectiveness of TSC in characterizing the stability of chained nonuniform configurations. The theoretical framework of “dynamic reconfiguration optimization—global stability evaluation—long-term safety control” established in this research not only provides innovative solutions for shield propulsion systems under complex geological conditions, but also delivers critical technical support through its engineering data-driven verification methodology and chain optimization strategy for the stability control of intelligent tunneling equipment in underground engineering.

To address the safety hazards associated with traditional pneumatic tires, such as blowouts, this study innovatively designs a modular safety tire. Focusing on its fundamental vibration characteristics, particularly at the first-order mode, the research adopts a combined approach of theoretical analysis and simulation verification: first, a theoretical model is established based on the Lagrange vibration differential equation, followed by the construction of a virtual prototype on the Adams/View platform for simulation validation. The study systematically investigates the first-order natural frequency characteristics of vehicles equipped with this tire under three vibration modes: vertical vibration, pitch vibration, and roll vibration. As fundamental research, the findings reveal that the modular safety tire exhibits excellent resonance suppression capabilities at the first-order mode, with its natural frequency range offering the following advantages: (1) effectively avoiding road excitation frequencies within common driving speed ranges; (2) circumventing resonance frequency bands caused by tire self-excited vibrations; and (3) preventing resonance issues during vehicle idling. This research not only provides an innovative solution for enhancing tire safety performance but also, through the analysis of its vibration characteristics at the first-order mode, validates that it meets operational standards. It holds substantial engineering application value for advancing automotive component technology innovation and serves as a foundation for future development.

A cost-effective deformable wheel designed to enhance cargo transportation in environments lacking elevators was proposed in this paper. Firstly, the configuration and rotating principle for the deformable wheel has been analyzed in detail, including the main parameters for the wheel. Secondly, the dimensional design for a vehicle with four wheels has been presented base on parameters from the climbing ladders. Thirdly, the virtual prototype for a vehicle has been set up based on the parameter from the designed wheel. Finally, the mostly factors effecting the stability and comfort of a vehicle have been discussed. Results shown that the deformable wheel has a strong ability to climb stairs without impairing stability and comfort. The findings would provide theoretical support and foundation for design and application of a new type of non-inflatable wheel with ability of climbing ladders.

The bearing characteristics of heavy load support platforms withredundant multibranch chains were investigated to resolve theproblem of heavy load support platforms that are subject to externalbias loads.

This study aims to investigate the force transmission characteristics of a multiple-fulcrum supporting platform, and the significance of this paper is to creatively put forward the law of uniform force characteristics of multiple-fulcrum supporting platform with heavy loads and layout reconfiguration methods to realize the law. In this paper, firstly, a force transmission model for the multiple-fulcrum supporting platform has been constructed, the relationship between force transmission characteristics and layout parameters for all fulcrums has been discussed in detail, and the layout law for all fulcrums with the same supporting force has been discovered. Then, layout reconfiguration methods have been proposed to realize the uniform force characteristics of all fulcrums under different types of constraint surfaces (rectangular or square constrained surface, circular constrained surface, and unconstrained surface). Finally, layout reconfiguration methods have been applied to some engineering problems by ADAMS simulation. The simulation results show that the supporting force of all fulcrums in the supporting platform is equal when the layout central point (LCP) of all fulcrums is coincident with the force equivalent point (FEP) of external loads. The results provide theoretical guidance and support for the reconfiguration of multiple-fulcrum supporting platforms that can realize uniform forces among all fulcrums.