Dynamic Characteristic Formulations for Jointed Space Structures

Yoshida, Tomihiko

doi:10.2514/1.15537

Cited by 16 publications

(5 citation statements)

References 14 publications

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“…Fig. 1 Force diagram of a jointed beam [20] Fig. 2 Force diagram of a differential section of a joint [20] 2.1 Modeling for energy dissipation caused by friction Pressure is usually applied on a joint to improve the stiffness of the deployed structure.…”

Section: Friction Damping For Jointed Structuresmentioning

confidence: 99%

“…2 Force diagram of a differential section of a joint [20] 2.1 Modeling for energy dissipation caused by friction Pressure is usually applied on a joint to improve the stiffness of the deployed structure. To investigate the friction damping caused by the pressure, the force diagram of a jointed cantilever given by Yoshida [20] is shown in Fig. 1.…”

Section: Friction Damping For Jointed Structuresmentioning

confidence: 99%

“…Tan et al [16,17] performed a force-displacement-velocity experiment on jointed links with cables to establish a nonlinear force model that considers nonlinear stiffness and damping. Based on force analysis and a simplified model for impact analysis, Yoshida [20] proposed a friction damping formulation and a procedure for calculating impact damping for jointed beams. However, the impact damping formulation is based on the assumption that the displacement amplitude of the jointed beams with clearance is linear.…”

Section: Introductionmentioning

confidence: 99%

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Damping formulations for jointed deployable space structures

et al. 2015

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Both the friction caused by the preload in locked joints and the impact caused by clearance in unlocked joints cause energy dissipation in jointed deployable structures. The energy dissipation of locked joints is studied by analyzing the force on the infinitesimal body of the joint. The jointed beam with an unlocked joint is simplified into an impact mass-spring model with clearance, which considers the coefficient of restitution of impact. The energy dissipations of the joint caused by friction and clearance are transformed into damping ratios by Taylor expansion. Then, the effects of pressure, clearance and the dynamic parameters on the damping of joints are analyzed by utilizing the damping ratio formulation. The damping ratio increases with the preload and the clearance. To validate the damping ratio formulation of joints, experiments on a single jointed beam with preload and double jointed beams with clearance are conducted. Comparison between the experimental results and the model simulation results shows that the friction and impact damping models are accurate for the dynamic calculation of deployable structures. Furthermore, the damping ratio formulations can be directly introduced into the design and dynamic analysis of deployable structures.

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Section: Friction Damping For Jointed Structuresmentioning

confidence: 99%

Section: Friction Damping For Jointed Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Damping formulations for jointed deployable space structures

et al. 2015

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“…Numerous works have been dedicated to the dynamic modeling and nonlinear analysis of this kind of structure [3][4][5][6], most of which tackle the joints in trusses as ideal joints ignoring the joint clearance. Joint clearance ensures that the structures can be successfully assembled and deployed [7] but leads to some unexpected influences, such as impact and friction, which affect the dynamic response, stability, and pointing accuracy of structures in orbit [8][9][10] as the primary sources of structural nonlinearity and damping. Therefore, joint clearance must be considered in modeling LDSS to improve model fidelity.…”

Section: Introductionmentioning

confidence: 99%

A study on the effects of clearance joints on the dynamic response of the beam-joint structure using VFIFE

Yao

Liang

Zhang

et al. 2023

Preprint

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Joint clearance is unavoidable because it ensures successful assembly and deployment, but it also affects the dynamic response, stability, and pointing accuracy of large deployable space structures. This paper investigates the effects of clearance joints on the dynamic response of a beam-joint structure, a fundamental element of large deployable space structures. Vector form intrinsic finite element is employed to establish the structure’s motion governing equation to overcome the difficulties in modeling and solving of traditional finite element method led by contact behavior. The contact forces are modeled by the Lankarani and Nikravesh contact model and the modified Coulomb's friction model. First, a classical benchmark problem of a clamped-clamped beam is studied to validate the accuracy and efficiency of the model proposed. Then, a planar beam-joint structure with clearance joints is used to investigate the effects of clearance on the dynamic response. Subsequently, multiple simulation cases are executed to study the effects of different clearance factors on the dynamic structural characteristics. The results show that as the coefficient of restitution becomes small and the sliding friction coefficient gets large, more energy is dissipated, revealing their significant influence on the structural damping characteristics. Joint clearance enlarges the structure’s dynamic response, and larger clearance size and more clearance joints exacerbate these effects. The structure’s damping ratio becomes larger when the clearance size gets smaller. These results indicate that clearance joints have significant effects on the structure's dynamic characteristics, and they must be considered in the design and analysis of high-precision space structures.

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“…铰链的动力学特性在含铰结构动力学问题的研究中尤为重要, 大量的理论分析及实验测量应用到了铰的动力学特性的研究中. Yoshida [15] 对空间结构中的含间隙铰进行了研究, 建立了铰的力学模型, 分析了在间隙段到接触段过程中频率转换及能量耗散的机理. Wang和Li [16] 研究了含间隙铰接两杆结构的非线性动力学问题, 将结构简化为弹簧质量系统, 假设铰的刚度为分段线性模式. Wang和Lion [17,18] 利用幅频响应函数对机械结构中的铰的动力学参数进行了辨识, 辨识过程中考虑到了环境的测量噪声.…”

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