Stiffness Matching Optimum Design Of Multi-Stanchion Landing Gear Airplane

The multi-wheel, multi-stanchion landing gear design has been selected by most of foreign large military transporter. The takeoff and landing security of the plane is improved and the demand to the road face of the airfield is depressed. But many difficult such as calculation of load distribution, crush stiffness matching of each stanchion, and so on exist. And, up to the present, no design criterion or guidance books about them can be found in China or other countries. In order to analyze the best stiffness matching design of stanchions and solve these problems above, the multi-stanchion landing gear has been chosen as the research object of this paper. A similar experimental model was made by using a military transporter as the objective archetype. The landing impact experiments of different states were accomplished and some rules of landing responses were found out. At the same time, a mechanical model of multi-stanchion landing gear and the whole plane was established, it's landing impact processes of different cases were simulated by MSC.Dytran, and the results were primary compared with the experimental data. In order to improve the simulation speed, an efficient approach to simulate the landing processes of multi-stanchion landing gear and the whole plane was set up, and the stiffness matching simulation system of multi-stanchion landing gear was established by applying this method. Many landing impact cases were simulated by this system, the results were compared with the previous experiment and MSC.Dytran simulation data, and the simulation approach and system were verified correct. Ultimately, the stanchion stiffness matching of each landing cases was optimized by applying the multi-objective optimum theory. The objective functions including the acceleration responses of key point of the airframe, the compression of each stanchion, and so on. The stiffness ratio of landing gear's stanchion were the design variable. Finally, the best stanchion stiffness matching was gained by synthesized all of the landing cases. The research of this paper can be used as the guidance and reference of multi-stanchion landing gear design.