Dynamic modeling and analysis of the looped space tether transportation system based on ANCF

IF 3.4 Q1 ENGINEERING, MECHANICAL 国际机械系统动力学学报(英文) Pub Date : 2022-07-03 DOI:10.1002/msd2.12044
Jie Yang, Qingtao Wang, Zhiyong Zhang, Zhendong Liu, Shidong Xu, Gangqiang Li
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Abstract

A high-fidelity multibody-system dynamic model of the looped tether transportation system (L-TTS) is proposed in this study to study its large deformation as well as large overall motion. The absolute nodal coordinate formulation (ANCF)-based gradient-deficient beam element is employed to establish the accurate model of the two flexible tethers subject to large deformations. The relative movement of climbers along tethers is described by using the sliding joint model based on ANCF. To reduce the collision risks between tethers and climbers, two libration suppression strategies, namely, the decelerated motion of climbers relative to tethers and multiple climbers per tether are investigated in this study. Several numerical simulations not only validate the effectiveness of the two strategies in reducing the collision risks between climbers and tethers, the overall librations of L-TTS, and the magnitudes of the longitudinal elastic force of tethers, but also verify the good performance of the high-fidelity model proposed in this study for dynamic simulation of the L-TTS in microgravity conditions.

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基于蚁群函数的环形空间系绳运输系统动力学建模与分析
针对环系绳运输系统的大变形和大整体运动,建立了环系绳运输系统的高保真多体系统动力学模型。采用基于绝对节点坐标公式(ANCF)的梯度亏缺梁单元,建立了两根大变形柔性系索的精确模型。利用基于蚁群函数的滑动节点模型描述了攀爬者沿锚索的相对运动。为了降低绳索与攀爬者碰撞的风险,本研究研究了两种抑制振动的策略,即攀爬者相对于绳索的减速运动和攀爬者对绳索的多重运动。数值模拟不仅验证了两种策略在降低攀登者与系绳碰撞风险、L-TTS整体振动和系绳纵向弹性力大小方面的有效性,而且验证了本研究提出的高保真度模型在微重力条件下L-TTS动态仿真中的良好性能。
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