Landing Gear Design And Absorber Properties Optimization Of Trans-atmospheric Vehicle

The landing gear is one of the important structures and systems of aircraft, which relate to the reliability and security of taking off and landing. With the space shuttle carrying tools developed to promote the work and the military and civilian needs, trans-atmospheric vehicle has become a new hotspot for International Aerospace Science and technology in the field of competition.Although landing gear design can learn from the experience, but it also brings new difficulties and challenges.The landing gear of trans-atmospheric vehicle is chosen as the research object in this paper.According to the overall parameters and the technological requirements of the trans-atmospheric vehicle, a conceptual design of the landing gear is given. And then the landing gear shock absorber is designed. According to engineering estimates the radial dimensions of the outer cylinder of shock absorber and piston, buffer the initial pressure-volume, the initial pressure, the compressor area of the oil area.Then, based on virtual prototyping technology the landing gear component 3D models were built and assembly.A dynamical model of landing gear drop is built in LMS Virtual.Lab Motion software and a buffer hydraulic model is built in AMESim software. According the two software,combined simulation of the performance of landing gear shock absorber is carried out. Combined with LMS Virtual.Lab Motion, the optimization of the landing gear shock absorber is established in OPTIMUS software. The force of the front landing gear shock absorber reduces 17.5% and the efficiency of shock absorber is improved 9.9%; the force of main landing gear shock absorber reduces 13.3% and the efficiency of shock absorber is improves 7.4%.Finally, based on the modified Craig-Bampton method of finite element analysis using finite element software to flexible landing gear and then carry out drop test. Good buffer performance is obtained by adjusting corresponding parameters.In this paper, a preliminary design scheme of trans-atmospheric vehicle landing gear is completed. The landing gear shock absorber design has been depend on the combined simulation based on Motion and AMESim, the optimization based on LMS Virtual.Lab Motion and OPTIMUS, which provides some reference for the shock absorber design of the landing gear in the future.