Shape analysis and optimization of airbag for space inflatable antenna

The characteristics of normal inflatable antennas are described in this paper.For its deficiency such as low stiffness,a new-style of rigid-flexible coupling inflatable antenna is introduced.The advantages and system-composition are presented.Airbag is an important component,and the shape and stress distribution of airbag is important for the whole structure.Thus,shape-state analysis is performed.The uniformity of constrained force at joint between airbag and rib will impact the state of joint,or even the deployment process.Therefore,a shape optimization of airbag is developed on the base of genetic algorithms,and the best shape of airbag is finally obtained.Therefore,the stress distribution of airbags will be uniformed and the antenna structure system will be more reliability.