Dynamic Analysis Of Partial Looped Space Elevator System Based On Absolute Node Coordinate Formulation

With Mankind beginning to enter the space age,space transportation has become the focus of increasing attention.Recently,Li et.al proposed the concept of a looped partial space elevator,which has high transportation efficiency and low cost.Due to the large overall size,long time of movement and subjecting to Coriolis force of the loopedshaped partial space elevator,it may habit large overall movement and collisions of tethers and elevators.Therefore,it is necessary to study the dynamic behavior of the looped partial elevator.Since the tether is too long relative to the overall size,the flexible deformation of the system needs to be considered.This paper uses curved thin beam element of ANCF to establish the dynamic model of the tether.It simplifies both the space elevator and the upper and lower platforms as masses attached to the tether,so that the space elevator can move along the tether.The platform ensures that the distance between the two ends of the tether remains unchanged.It establishes system dynamics equations in a microgravity environment and uses generalized-method to perform finite element analysis on them.This paper introduces the dynamic model of the looped partial space elevator system.In this paper,a restraint model of elevator movement along the rope is established and the system dynamics equation is derived.It gives a detailed description of curved thin beam element of ANCF.Numerical simulation results show that the traditional circular single elevator system will produce large lateral swing during movement,which may cause the two elevators to contact.This paper proposes two strategies to reduce the system swing by increasing the number of elevators and the elevator decelerating movement under the condition that the total elevator mass remains unchanged.The research content of this paper provides theoretical basis for the realization of partial space elevator tether transportation system.