Research On Ground Loads Of Aircraft With Multi-wheels And Multi-landing Gear

Landing gear with multi-wheels and multi-struts was put forward shortly after the occurrence of tricycle landing gear. The research on the ground load of landing gear with multi-wheels and multi-struts has been conducted for a long time and the research is quite successful at abroad. However, due to the blockage of the developed countries in technical information as well as the number of aircraft with multi-wheels and multi-landing gear keeps growing. Now, it is worthwhile to conduct the research on the ground load of landing gear with multi-wheels and multi-strutsAccording to the basic theories of the mechanics, the dynamics analysis model of the full-aircraft during its landing process is established in this paper. Then the massive dynamics software-ADAMS is used to conduct the drop analysis and symmetric landing analysis. At last, the researchers discussed and analyzed the results of the simulation contrastively.Firstly, according to the conditions of the aircraft being researched, differential coefficient equations of the aircraft during its symmetric landing are established systemically in this paper. In addition, considering the distribution characteristics of the landing gear mentioned above, the equations used to calculate the forces of its stroke absorbers as well as its tires are presented in detail in the paper.Secondly, a full-aircraft assembly model in software ADAM is defined, which includes an airframe subsystem, a strut subsystem of the nose landing gear, a wheel subsystem of the nose landing gear, a strut subsystem of the forward main landing gear, a wheel subsystem of the forward main landing gear, a strut subsystem of the after main landing gear and a wheel subsystem of the after main landing gear. Then the drop simulation analysis and symmetric landing of the full-aircraft is being conducted in this research.Finally, the author analyzed the results of the dynamic simulation and given a rough conclusion about the distribution of the ground loads of the aircraft researched among its different landing gears. It is proved by the analysis that, during the symmetric landing of that airplane, the impact load of the after main landing gear is the largest among those landing gears and the nose landing gear comprised of about 18 percent of the total impact load. Comparing to that of the traditional nose wheel landing gear, the distribution of the ground load of the aircraft multi-wheels and...