Simulation Research Of The Damaged Aircraft Trailer Based On Virtual Prototype Technology

The trailer for damaged aircraft is the necessary special vehicle for the rescue at the large-scale airport. It is mainly used to move the airplane away from the scene of the accident quickly in order to restore the normal order of the airport after some serious airplane crashes,which provides the guarantee for the normal flight take off and land.Based on the technology of virtual prototype, simulation study on the trailer for moving the airplane and lightweight on its related parts are carried out. The main research steps are as follows:1. build the virtual prototype of the trailer for moving the damaged aircraft. First of all,The Solidworks software is used to establish three-dimensional model of the trailer, then import this model into the dynamics simulation software ADAMS and finally finish the virtual prototype of one vehicle and multi-vehicles cooperation for moving the aircraft.2. Verify the validity of the finite element model of the cantilever through the stress test.The Patran software is used to set up the finite element model of the cantilever, the load boundary condition of which stems from the dynamic model of the independent suspension in ADAMS and a static analysis of the cantilever is completed. Then a stress-test platform of the cantilever is designed and the result of the finite element simulation and the result of stress test are compared to verify the validity of the finite element model on the condition of different loads, which makes the preparation for the lightweight research of the cantilever in the next step.3. Research the lightweight of the cantilever Based on the multidisciplinary design optimization method. the three-dimensional modeling software Solidworks is used for the parametric modeling of the cantilever and the sim-flow process is built in Isight. On the basis of this, experimental design of the cantilever sheet thickness and the position of the rib is made to verify the input variables through comparing the contribution rate of different input variables in the pareto diagram. Finally with the max stress less than allowable stress as constraint and mass being minimum as objective function, the Multi-Island Genetic Algorithm is used to find the global optimal solution for lightweight.4. Research the rigid-flexible coupling dynamics simulation of the connecting beam in the multi vehicles collaborative work. The connecting beam plays a key role in keeping the synchronous operation of the frames in the multi vehicles collaborative work and avoiding causing the secondary damage of the aircraft. As for the flexible effects of the connecting beam, Patran is applied to make the connecting beam flexible, which generates the MNF file containing the flexible information to replace the original rigid model in ADAMS. Thus the rigid-flexible coupling dynamics model is built with the connecting beam as the study objective. On the basis of this model, an analysis of force in the two ends of the connecting beam is compared in the rigid model and in the rigid-flexible model and the stress and strain of the connecting beam is studied in the operation.