This project belongs to the discipline of aviation systems engineering. The development of large and medium-sized aircraft is related to national security and the core interests of economic development. It is of great strategic significance to promoting the development of my country's aviation industry, enhancing its ability to participate in global scientific and technological competition, and realizing the transformation from a major aviation country to a powerful aviation country. At present, my country's Y-20, C-919, and Jiaolong 600 large aircraft have been successfully tested one after another. However, the domestic D-class flight simulator (the highest level in international civil aviation standards) relies entirely on imports, and its key technologies have long been monopolized or even blocked by foreign countries. The project team actively meets the strategic needs of the country's military-civilian integration and the development of the national civil aircraft, and conducts a series of projects such as& ldquo; Made in China& 2025rdquo; Driven by the national strategy, the military and civilian sides have worked closely together. After more than ten years of independent innovation in industry, academia and research, they have successfully developed Y-7, Y-8, Y-9, KJ (airborne early warning) 200, KJ (airborne early warning) 500, Boeing 737-800, etc. Multiple large and medium-sized aircraft full-mission flight simulators have made major breakthroughs in key technologies such as D-level flight simulator system integration, core avionics software simulation, high-precision atmospheric environment modeling, and precise construction of virtual environments. The core technical indicators have met the requirements of China's Civil Aviation CCAR-60 D-level simulator, and the overall level has reached international advanced, filling domestic gaps. The main innovation results are as follows: 1. China took the lead in establishing a D-class flight simulator system integration architecture that meets the highest standards of the FAA and China's CCAR, solving the problems of core flight data analysis, closed-loop precision assembly, hybrid real-time network construction, and automatic inspection and testing software development. System integration problems have broken the long-term dependence on imports for domestic D-class flight simulators, and the overall technology has made major breakthroughs and reached the international advanced level. 2. Invented an ldquo; digital matrix rdquo; multi-channel voice communication system, built a dual redundancy architecture based on raster graphics and segmented rendering technology, independently developed a navigation module with sensor-level simulation accuracy, ARINC708 protocol meteorological cloud map and terrain information, modeling and simulation of core avionics software such as communications, breaking the technical monopoly that the core avionics system of civil aircraft is controlled by foreign manufacturers, and reaching the domestic leading level and the advanced level of similar foreign simulators. 3. For the first time, the combined modeling of Dryden turbulence fields using the particle-based meshless lattice-Boltzmann method (LBM) and the Tustin bilinear transformation method was applied to realize real-time simulation of the three-dimensional flow field in the airport area, overcoming the difficulty of fine modeling of complex atmospheric environments such as wind shear during low-altitude flights in the airport area, which has greatly improved the modeling and simulation degree in special meteorological environments, and the accuracy has reached the D standard of simulators. 4. Creatively proposed a multi-channel real-time sound fusion algorithm and a frequency response curve compensation algorithm based on four-level parameter conversion to complete accurate simulation of the sound system, with a fitting error reaching plusmn;5dB, reaching the D level standard; finite element analysis method was used to extract the acceleration power spectral density. Based on the main frequency points and characteristic influence parameters, a dynamic special effect simulation model was established, and the error at 6 peak frequencies did not exceed plusmn;2Hz, higher than the D level standard, reaching the technological leading level of similar simulators at home and abroad. Related technologies have formed 30 invention patents, 9 utility models, and 1 software copyright; published 46 papers and works, with a total of 197 citations; and formulated 1 national military standard. Since the development of the project, a total of 7 full-mission flight simulators of various models have been put into use, training more than 520 pilots, 31600 hours of flight simulation time, saving training costs of 2.7 billion yuan (including 798 million yuan in the past three years). The results of the project have significantly promoted the technological progress of the domestic simulator industry. In the future, the annual demand for large and medium-sized aircraft simulators will be nearly 10 billion, which will bring huge economic value to the domestic D-class simulators entering domestic and foreign markets and have significant social benefits.