Research On Gas-solid Coupling Of Inflatable Membrane Boom

The inflatable structures possess many properties such as small packing volume,ultra-light weight, high reliability, and show wide applications prospects in the field ofaeronautics and astronautics. Inflatable membrane boom used as a typical supportcomponent of spatial structure, its deploying process has an important influence on thedynamic behavior of satellite bus. The research of gas-solid coupling could provide thereference for a smooth and expansion of inflatable film tube. This paper focuses on thegas-solid coupling of the inflatable membrane boom’s expansion and mode andharmonic response of inflatable membrane boom.For the gas-solid coupling of inflatable membrane boom, we propose a quasi-staticmodel of membrane boom, which could simulate each transient of the inflatablemembrane boom’s expansion. We derive the airflow’s governing equation under ALEdescription, and the vibration equation of the film wall which includes prestress. Finally,we use the finite difference method to discrete those equations, and create a solvingmethod of this problem with gas-solid coupling boundary conditions and ALE movingmesh method.Based on solving method of gas-solid coupling, we would solve the problem of thegas-solid coupling of inflatable membrane boom’s expansion. On one hand, air flowfield in the membrane boom is analyzed and verified, and make a discussion that thegas-solid coupling characteristics of the inflatable membrane tube’s expansion dependon the quasi-static model of inflatable film boom. In addition, we analyze the influenceof the solution on this problem based on the gas parameters and structure parameters. Itwill provide useful theoretic references for developing dynamics of inflatable membranetube.For the solution of dynamic characteristics on inflatable membrane tube, wepropose the wet mode’s solving method of the inflatable membrane boom. This paperdiscusses the changes of inflatable boom’s modal and harmony response due to the gasin the inflatable membrane boom. Firstly, we solve the mode of inflatable membranetube based on the wet mode’s solving method, and study the rules how the gasinfluences the modal. Then we make a discussion that the influence to the mode comefrom gas density and sound velocity in gas. Finally, when changing the membrane tubestructure parameters, we study the modal influence of inflatable tube from the gas. Thisresearch will provide reference for the solution of dynamic characteristics of themembrane tube.