Design And Finite Element Optimization Analysis Of Rapidly Assembled Helipad

China has the characteristics of large land area and complex geographical environment,and it is highly vulnerable to frequent natural disasters.In this context,aviation emergency rescue is playing an increasingly important role.However,the complex geographical environment poses great challenges to emergency rescue.In many cases,rescue helicopters cannot land in time for rescue work,thus delaying valuable rescue time.In this context,it is urgent to develop a mobile apron that can be quickly laid out in complex environments.Firstly,the functional requirements of the rapid paving research design were introduced,including the requirements for rapidity,the requirements for the helicopter,and the national standards to be met.According to the requirements,the preliminary design of several different types of rapidly assembled Helipad were completed,and one of them was selected as the final solution for analysis.Finally,through the three planning schemes,the basic dimensions of the final scheme was initially planned under the premise of meeting certain requirements.Secondly,static analysis of quick couplings was conducted under two stress conditions.Under the wheel load conditions,the static analysis of the two positions of the deck unit and the assembly in the three soil environments of hard,medium hard and soft were carried out,and the more extreme cases were analyzed.Finally,the stress of the deck assembly in hard,medium hard and soft soil environment were analyzed under the sliding load condition.In terms of dynamics,the impact on the deck at the same location was mainly analyzed under the vertical landing conditions of the helicopter as also as the dynamic analysis of the deck during airdrop.Then,multi-objective optimization based on response surface methodology was conducted for the rapidly assembly helicopter.Firstly,the parametric models of decks and connectors were established,and appropriate test points were selected through experimental design to construct a response surface proxy model.Then the multi-objective genetic algorithm was used to optimize the deck structure and quick connecting parts,and the Pareto feasible solution with the aim of mass,deformation and stress was sought.Finally,Experiments of the rapidly assembled helipad on loading and assembling were conducted.The static experiments and dynamic experiments were carried out on deck units and deck assemblies under different conditions of force and load conditions in which the deformation and dynamic response of the deck under different conditions were discussed.The assembly experiment on the rapidly assembled helipad was carried out in three environments: concrete,grassland,snow underground,and the assembly time of the full-size rapidly assembled helipad was estimated based on the experimental results.