| As a potential new type of space transportation system,the space elevator system has been widely studied by scholars due to its low transportation cost and strong transportation capacity.However,most of the current research are on the vibration suppression of ropes.Few scholars have studied the influence of the complicated mechanical environment(such as the gravity of the moon)on the space elevator system.Moreover,the current research on the space elevator system is mainly based on two types of models: the constant cross-section space elevator model and the variable cross-section space elevator model.Although the variable cross-section space elevator model has lower requirements on the strength of the rope material than the constant cross-section space elevator model.However,due to its complicated cross-sectional area change function,its practical application prospects are limited,so it is only suitable for theoretical analysis.Therefore,this article is mainly based on a new segmented space elevator system model,combined with a new finite element method,to deeply explore the influence of lunar gravity on the stress and displacement of the equatorial space elevator system,and to study the dynamic performance of the system.Based on the disadvantages of the existing space elevator model,this paper proposes a new segmented space elevator system model.The segmented space elevator system achieves the purpose of reducing the internal stress of the rope by segmenting the rope,each segement with a different cross-sectional area.Based on the segmented design idea,the rope segmentation parameters are optimized and calculated,and the segmented equatorial space elevator system finite element analysis model is established based on the optimized system parameters,and an iterative calculation method is proposed to correct the finite element calculation error.Through a comparative analysis with the traditional space elevator system structure,the effectiveness of the segmented space elevator system in reducing the peak stress of the system is demonstrated,and it reflects the huge advantages of the new design and engineering practicability.Based on the finite element model of the new segmented equatorial space elevator system,the influence of the lunar gravitation on the space elevator system is analyzed,and the magnitude of the influence of the lunar gravitational acceleration is obtained.Combined with different working conditions,it comprehensively analyzes the influence of lunar gravity on the stress and displacement of the segmented space elevator system,and explores the influence of the number of rope segments and the length of the rope on the moon’s gravitational effect.Through finite element analysis and theoretical analysis,the influence of lunar gravity is clarified,which provides a guidance for the subsequent model design of the segmented space elevator system.The dynamic models of two segmented space elevator systems,flexible and rigid,were established respectively,and the modal analysis and stability analysis of the space elevator system under the influence of lunar gravity were carried out by using the dynamic model.Through the finite element analysis,the axial and lateral vibration laws of the segmented space elevator system under different lunar gravitational conditions are explored,and the influence of the segmental parameters of the rope on its vibration is explored,and the effect of the segmented space elevator system is clarified.The main factor of the vibration frequency,and the gradual stability characteristics of the segmented space elevator system structure are demonstrated.The calculation results show that the segmented space elevator system has the structural frequency adjustability compared with the traditional space elevator system,and by optimizing the design of the number of segments of the segmented rope and other parameters,the vibration frequency of the system itself can be effectively increased,so as to provide convenience for later vibration suppression. |
