With the rapid development of the global aviation industry, airport ground operations management is increasingly challenging. Ensuring safety, improving efficiency, and reducing environmental impacts constitute critical tasks. To address this, a mixed-integer linear programming model incorporating taxiway conflict prevention was developed. This model aimed to minimize taxi time and CO₂ emissions through dynamic optimization with the non-dominated sorting genetic algorithm II (NSGA-II). Implementation was conducted in Python for a major Chinese hub airport, with results compared against the commercial optimizer Gurobi. Computational findings reveal a 17.46% reduction in total taxi time and an 18.35% decrease in CO₂ emissions across 14 aircraft. The NSGA-II solution is found to be within 1.083% of Gurobi’s optimal solution, while a 95.0% faster computation time is achieved. The capability of NSGA-II in handling large-scale multi-objective taxi path optimization problems is demonstrated. Operational efficiency is enhanced, and CO₂ emissions are significantly reduced by the proposed approach.

In order to study the displacement characteristics of pile and anchor supporting deep foundation pit in seasonal frozen loess area, the horizontal displacement of pile top and pile body and the surface settlement outside the pit under different working conditions were compared by indoor scale model test. The results show that water migration and redistribution occur in the freeze-thaw cycle, and the existence of external water replenishment conditions will accelerate the water migration rate, which makes the displacement of supporting structure and the surface settlement outside the pit much larger than that in the excavation stage. The maximum horizontal displacement of pile top and pile body in the freeze-thaw stage under closed conditions increase by 6~8 times compared with that in the excavation stage, and the surface settlement outside the pit increases by 3 times. Compared with the closed freeze-thaw condition, the horizontal displacement of pile top and pile body increases about 1.4 and 1.2 times, and the surface settlement outside the pit increases 1.5 times. The research results can provide reference for the risk prevention and control of pile and anchor support deep foundation pit construction in this kind of seasonal freezing loess area.

A numerical simulation of groundwater dynamics in the Sugan Lake Basin was conducted by using MODFLOW, and 50-year predictions were made for four different water diversion schemes. The results from MODFLOW simulations fit well with the measured data, indicating that the established model can be used for predicting the groundwater dynamics in the Sugan Lake Basin. The MODFLOW simulation results under different water diversion schemes reveal that over a period of 50 years, as the amount of diverted water increases, the shrinkage rate of the large Sugan Lake’s area also increases, and the groundwater level in the Sugan Lake Basin shows a general declining trend. The impact of inter-basin water transfer exhibits certain time lags and spatial heterogeneity. Considering both the water diversion requirements and the effects of the water diversion project on the ecological environment of the Sugan Lake Basin, it is suggested that a water diversion scheme of 1.0×10⁸ m³/a is more appropriate. The research results provide important scientific theoretical support for assessing the impacts of inter-basin water transfer projects on the ecological environment of the Sugan Lake Basin and for determining suitable water diversion schemes.

Two schemes, hollow shaft and solid shaft were proposed for the cantilever high-speed rotor of a turbofan engine during the structural design stage. Based on the beam element finite element method, rotor dynamic analysis models with hollow shaft and solid shaft were established, and critical speed and vibration mode calculations were carried out. The calculation results show that hollow shaft structure is suitable for the rotor. Then, an analysis was conducted on the sensitivity of the unbalance response of a rotor with a hollow shaft to the unbalance amount at the characteristic position, providing a basis for the selection of balance surfaces in high-speed dynamic balance test. Finally, the dynamic characteristics test of the simulated rotor with hollow shaft within the full speed range and the high-speed dynamic balance test research at the working speed were completed. The rotor smoothly crossed the two orders bending critical speed and safely operated to the working speed, verifying the rationality of the rotor’s hollow shaft structure and dynamic design. Compared with the experimental results, the calculation error of the established finite element model is not more than 4.08%, which well reflects the dynamic characteristics of the rotor. After high-speed dynamic balancing, the deflection of the rotor at the working speed is significantly reduced, not less than 33.33%. The research results provide reference and technical support for the structural, dynamic design, and experimental research of real low-pressure rotors, and has important engineering value.

In order to study the problem that the processing of 7075 aluminum alloy rings was affected by the large value of initial residual stress, the effect of reducing the residual stress was investigated by using the method of compression of 7075 aluminum alloy rings along the ring direction. ABAQUS simulation software was used to simulate the quenching and compression of 7075 aluminum alloy rings to obtain the initial residual stress field and the residual stress field after compression. The results show that the initial residual stresses generated by quenching can be effectively reduced by the method of compression in the ring direction. After the data before and after compression is compared, it is found that when the compression deformation amount is 1.312 5%, the amplitude of quenching residual stress decreases by 57% of the original residual stress value as a whole, and the amplitude of radial residual stress and circumferential residual stress decreases by about 58%. It is concluded that the method of circumferential compression can effectively reduce the residual stresses of aluminum alloy ring parts.

Due to the high calorific value of energetic materials combined with their flammable and explosive nature. The propagation in the tube will affect the shape and geometric dimensions of the tube, resulting in the propagation of detonations is affected. In order to deeply investigate the influence of annular perturbation on the propagation of detonation waves, accurately and clearly observe the propagation dynamics of the detonation wave in annular tube, and better reflect the influence of boundary layer effect and curvature tube wall on detonation waves.An annular disturbance detonation experimental device was built up. Annular disturbance was realized by adding disturbance tubes with different diameters to the end of the smooth circular tube. The detonation wave velocity, triple-point trajectory, and cell structure were observed by using a data acquisition system composed of pressure sensors and smoke films. The experimental system of annular disturbance detonation was constructed successfully. It was able to obtain the ideal propagation data with remarkable regularity and high reliability. After verification, the detonation experimental device built has excellent data acquisition capabilities, and the obtained data confirms that the device is scientific and effective. The experimental system built contributes to providing theoretical support for accident prevention and control, allowing scientific instruments to play a more significant role in supporting technological innovation and societal development.

The optimization and operational control of ventilation systems on the offshore platforms is of great significance for improving cabin environmental quality and ensuring occupant health. In response to the current lack of a comprehensive design standard system for offshore platform ventilation, domestic and international specifications for shipboard and land-based ventilation systems were systematically classified and summarized to establish a dedicated design standard framework tailored to offshore platforms. Ventilation rate models, indoor dynamic models, air quality models, and energy consumption models were analyzed. Furthermore, an overview of ventilation optimization methods was provided for three critical areas: living areas, equipment areas, and storage areas. Current challenges and technical difficulties in system design and operation were analyzed, and feasible future development strategies for ventilation system design and optimization were proposed. The research results provide scientific basis and technical guidance for the design, operation, and energy-saving measures of offshore platform ventilation systems.

With the development of global oil and gas exploration and development to deep and ultra-deep wells, the problems such as underground high temperature environment and unreasonable selection of drilling parameters in field operation make the bit wear increasingly serious. In order to prolong the bit life and improve the rock breaking efficiency, a 3D simulation model of polycrystalline diamond compact(PDC) cutters marble was established, and the effects of different cutting depth, cutting speed and bit caster on the PDC cutters surface temperature and rock breaking efficiency were analyzed. The results show that the temperature rise of the cutting gear can be divided into three stages: ascending period, transitional period and stable period, and the crushing form of the rock changes from plastic to brittle when the cutting depth increases to a certain extent. With the increase of cutting speed, both temperature and crushing work ratio increase. With the increase of cutting depth and bit caster, the crushing work ratio increases and the temperature increases first and then decreases. The response surface method was used to optimize the cutting speed, cutting depth and bit caster, and the optimal parameter combination was given. The research results can provide guidance for efficient rock breaking of PDC bit in field.

The continental shale oil in the Da’anzhai section of the Ziliujing Formation in the Sichuan Basin has great exploration and development prospects. The sedimentary facies are diverse, the lithology is complex, and the vertical changes are fast. The understanding of the lithological differentiation combination mode and reservoir characteristics is unclear, which restricts the optimal selection of favorable shale oil reservoirs in the Da’anzhai section. Based on observations, thin section analysis, X-ray diffraction (XRD), vitrinite reflectance Ro testing, total organic carbon (TOC) content testing, physical property testing, rock pyrolysis, fluorescence analysis, and other experiments of four actual drilling cores in the central Sichuan Basin. By comprehensively analyzing mineral composition characteristics, as well as considering the content, occurrence, thickness of the shell layer, and its superimposed relationship with shale, seven lithological combination models for the Da’anzhai member in the central Sichuan basin were established (pure shale type, shale interbedded with floating shell limestone type, shale interbedded with millimeter scale shell limestone type, shale interbedded with centimeter scale shell limestone type, shale interbedded with centimeter scale shell limestone type, shale interbedded with shell limestone type, and pure shell limestone type). By integrating reservoir characteristic parameters such as TOC content, physical properties, oil content, and brittleness index, the reservoir characteristics of different lithological combinations were clarified. Based on the exploration and development practices of the Da’anzhai section and reservoir characteristics, a classification evaluation standard for reservoirs was established. It is believed that the lithological combination of shale interbedded with millimeter scale shell limestone and shale interbedded with centimeter scale shell limestone is the key layer for exploration and development, which has most favorable source reservoir combination, best physical properties, the highest oil saturation index(OSI) index, strong mobility, and good brittleness. The thick dark shale interval has the highest TOC content, good physical and oil properties, which is a potential interval for further exploration.

The application of building information modeling(BIM) technology in the construction industry in China has developed rapidly, and its further development is inseparable from the support of BIM standards. In view of the importance of BIM standards, it is necessary to review the existing researches on BIM standards. Firstly, three key research topics, namely theoretical research, technical research and application research of BIM standards, were determined by keyword cluster analysis method. Secondly, for each research topic, the methods and results of existing research were explained and summarized through critical review, with typical cases being enumerated. Then, the evolution trend of BIM standard research was analyzed by using the timeline map generated by keywords. The results indicate that the extension of industry foundation classes(IFC) standard and the technical and application research based on IFC will still be the research hotspots. At the same time, research on BIM standard framework will continue. Furthermore, future research on BIM standards should also focus on three cutting-edge areas: technological integration, expansion of application scenarios, and cross-disciplinary collaboration. The research results will help further develop BIM standards and improve the formulation and application level of BIM standards.