With numerous applications coilable masts in high-precision astronomical observations,such as X-ray source observations,it is important to investigate mast stiffness.To date,there have been many studies on the bending...With numerous applications coilable masts in high-precision astronomical observations,such as X-ray source observations,it is important to investigate mast stiffness.To date,there have been many studies on the bending stiffness of coilable masts,but few studies on their torsional stiffness,especially regarding the nonlinear characteristics of torsional stiffness of coilable masts under large torsional deformation.In this paper,a nonlinear analysis method is presented to examine the torsional stiffness of coilable masts with triangular sections.Based on the second-order bending buckling hypothesis of battens under large torsion deformation,the nonlinear relationship between torsional torque and torsional angle is obtained by analyzing torsional deformation and force of coilable masts.This method is used to analyze the torsional stiffness nonlinearity of a certain type of coilable mast which will be used in a practical application in the future and the results are verified by simulation and testing.The comparison results show that the error is within the acceptable range,which proves the effectiveness of the proposed method.展开更多
Coilable masts are extensively utilized in aerospace systems owing to their structural simplicity,reliability,and high deployment ratios.However,their application is constrained by compression-twist coupling motion du...Coilable masts are extensively utilized in aerospace systems owing to their structural simplicity,reliability,and high deployment ratios.However,their application is constrained by compression-twist coupling motion during deployment,which induces large structure deformations and displacements.To address this limitation,this study proposes a parallel chiral coilable mast with synergistic control strategies.This design transforms the conventional unidirectional compression-twist motion into a bidirectional synchronous pure sliding deployment.Three pretensioned modes were developed for a single-bay unit based on diagonal constraints,leveraging the critical role of diagonals in achieving structural bistability.A topologyoptimized multi-bay configuration enables directional rotation while maintaining structural stability via pretension modes.By redesigning structural constraints on the top and bottom disks,a decoupling strategy achieves pure linear motion at the top batten frame,significantly expanding the operational envelope.The parallel-designed chiral configuration is developed based on the synergistic control strategies of these two structural constraints.Numerical simulations and experimental validation confirm the effectiveness and feasibility of the synergistic control strategies.The chiral configuration facilitates multifunctional deployment capabilities in geometrically unconstrained environments,demonstrating substantial improvements over conventional designs.展开更多
文摘With numerous applications coilable masts in high-precision astronomical observations,such as X-ray source observations,it is important to investigate mast stiffness.To date,there have been many studies on the bending stiffness of coilable masts,but few studies on their torsional stiffness,especially regarding the nonlinear characteristics of torsional stiffness of coilable masts under large torsional deformation.In this paper,a nonlinear analysis method is presented to examine the torsional stiffness of coilable masts with triangular sections.Based on the second-order bending buckling hypothesis of battens under large torsion deformation,the nonlinear relationship between torsional torque and torsional angle is obtained by analyzing torsional deformation and force of coilable masts.This method is used to analyze the torsional stiffness nonlinearity of a certain type of coilable mast which will be used in a practical application in the future and the results are verified by simulation and testing.The comparison results show that the error is within the acceptable range,which proves the effectiveness of the proposed method.
基金supported by the National Key R&D Program of China(Grant No.2018YFB1304600)the CAS Interdisciplinary Innovation Team(Grant No.JCTD-2018-11)the National Natural Science Foundation of China(Grant No.51775541)。
文摘Coilable masts are extensively utilized in aerospace systems owing to their structural simplicity,reliability,and high deployment ratios.However,their application is constrained by compression-twist coupling motion during deployment,which induces large structure deformations and displacements.To address this limitation,this study proposes a parallel chiral coilable mast with synergistic control strategies.This design transforms the conventional unidirectional compression-twist motion into a bidirectional synchronous pure sliding deployment.Three pretensioned modes were developed for a single-bay unit based on diagonal constraints,leveraging the critical role of diagonals in achieving structural bistability.A topologyoptimized multi-bay configuration enables directional rotation while maintaining structural stability via pretension modes.By redesigning structural constraints on the top and bottom disks,a decoupling strategy achieves pure linear motion at the top batten frame,significantly expanding the operational envelope.The parallel-designed chiral configuration is developed based on the synergistic control strategies of these two structural constraints.Numerical simulations and experimental validation confirm the effectiveness and feasibility of the synergistic control strategies.The chiral configuration facilitates multifunctional deployment capabilities in geometrically unconstrained environments,demonstrating substantial improvements over conventional designs.
