Scheme Design And Landing Simulation Of Air Cushion Landing System

An amphibious landing aircraft is a hot research field,and the Air Cushion Landing System(ACLS)is one which can complete an amphibious landing process.ACLS can adapt to a variety of complex landing terrains,which greatly expands the landing range of a fixed wing aircraft.When landing with ACLS,the air cushion body is deformed and compressed with the pressure increasing,and the gas exhausts through the ports to deplete energy until the landing process ending.Under the background of a ground-effect aircraft,the conceptual design of the ACLS and the preliminary design of the trunk are completed.Based on the nonlinear finite element theory and LS-DYNA simulation platform,the simulation analysis model of ACLS and the finite element landing model of whole aircraft are established and analysis is carried out.The deformation and stress levels of ACLS is analyzed.The curves of displacement,velocity variation and acceleration are obtained.The volume and pressure change and ACLS's cushion performance are comprehensively evaluated.The simulation results show that: ACLS does not occur rebound away the ground in the landing process,and the biggest shock overload is 2.87 g less than the maximum permissible overload 3g,which means ACLS meets the requirements of cushion performance.Also,the bottom of the fuselage does not touch the ground,which means the stroke and body shape of the ACLS meets the requirements.At present,the research of ACLS is still at the exploratory stage and the cushion performance simulation of ACLS using the modern finite element method is still in the blank.This study will provide a method for the design of ACLS and certain reference significance to cushion performance simulation analysis.