Study On The Device Of Unloding The Gravity In The Expansion Process Of The Solar Arrays

In recent years,the demand for people's life has been rising,more and more functions are needed for satellites,scientists have had to develop new large solar arrays to meet their energy needs.The solar arrays must undergo rigorous testing on the ground before it is put into use.To obtain reliable ground test data,a simulated microgravity environment must be provided for the solar arrays.The traditional ground test equipment on the ground has a large inertia and large frictional resistance,which can only meet the longitudinal expansion requirements of the small solar arrays.In this paper,the structure of the solar arrays is large,and it is a transverse expansion mode,which is a new large solar arrays.Therefore,it is necessary to design a new unfolding device to provide the microgravity environment needed for expansion test on the ground.The main work and achievements of this paper are as follows:1.The paper expounded the research status of microgravity environment simulation technology,several common methods of microgravity environment simulation was introduced.The key of microgravity environment simulation is the gravity compensation and barycenter following.2.Analyzed the differences between the traditional large solar arrays and the new large solar arrays,introduced the structure and expansion process of the transverse expansion part of the solar arrays in this project,designed three scheme about the device of unloading the gravity,by contrast,that motor follow,double towel bar-gear follow schemes can not meet the requirement,the single towel bar-pulleys follow scheme have high safety factor and less friction,and it is light weight,will be the best solution for this project.3.From the Angle of ensuring the safety of the solar arrays,reducing the inertia and lessening the pressure imposed on the longitudinal expansion as much as possible,presented the functional requirements and performance requirements of the device,designed the structural of the component that hangs the side board,the mechanism for turning over and the component that hangs the middle-outer panel in detail.4.Using ADAMS software to simulate the device of unloading the gravity,the solar arrays model and the overall model.it is concluded that the device of unloading the gravity can realize following the barycenter of the solar arrays,but it does not meet the requirements of hanging with a constant force.then through optimizing the structure of the mechanism for turning over,made the device of unloading the gravity meet the requirement that hang the solar wing with a constant force.5.Made a unfolding device for the solar arrays,built a experimental platform,analyzed the problems encountered in the platform construction and put forward the improvement measures.Finally,designed the experiment and tested the performance of the device of unloading the gravity and it is satisfying.