utilized a lumped-parameter approach for simulating the dynamics of a flexible net, and the capability of the net was demonstrated by multiple numerical experiments. The results show that space flexible nets are suitable for use in very large structures. studied a robust control method for a successful spin deployment and proposed the use of an analytical three-degree-of-freedom model and a fully three-dimensional finite element model to analyze the deployment of the space flexible net. used the mass-spring parallel method and the absolute nodal coordinate formulation method to construct a nonlinear constitutive model of a flexible net and, as explored in the expansion process, the results show that the computational amount dealt with in the absolute nodal coordinate formulation method is much larger than that in the mass-spring parallel method, although the absolute nodal coordinate formulation method can repeat the evolutionary behaviors of the flexible net more naturally. Some dynamical modeling methods for flexible nets described in prior research were reviewed for reference. In this study, a flexible net, which consists of a flexible net and several actuators connected to its corners, is proposed to execute the ADC mission. Therefore, flexible connection capturing has acquired more and more attention in recent years. The validity of these mechanisms can also be tested on the ground. Compared to rigid mechanisms, the material used for these capturing methods is more flexible and thus more adaptive for debris with complicated geometries. These mechanisms also have a larger space extension range, which can be used to capture targets with huge dimensions and capture multiple targets in one task. Flexible mechanisms allow for a long distance between the mothership and non-cooperative targets, making highly precise docking unnecessary. As for flexible connection mechanisms, harpoons, tether grippers, and space nets are commonly proposed. Due to the hardness of the material, stiff connection mechanisms are more likely to be destroyed during capture.
Thus, it is much harder to capture space debris using a stiff connection strategy. However, high precision rendezvous and docking are necessary for these mechanisms to function. The stiffness of composites, the ease with which they can be tested on the ground, and higher technology readiness level are their three obvious strengths compared to flexible connection capturing. In terms of stiff connection mechanisms, tentacles, single robotic arms, and multiple arms have been widely researched. The critical indicator results show that the wrapping of the debris is stable thus, this method is feasible for future missions.Ĭapture strategies can be simply characterized as stiff connection capturing and flexible connection capturing. Moreover, the debris can be fully enveloped and further dragged away along the expected trajectory. The flexible net can capture the debris rotating with an angular velocity of 6.28 rad/s. Numerical simulations show that the flexible net has an excellent capture capability with the presented control scheme. Moreover, compared with the previous space debris capture mechanism, the presented flexible net can be opened or closed repeatedly thus, the proposed flexible net has more potential to capture many pieces of debris in one mission. The presented method can be used to simulate the capture and post-capture process of irregular and rotating debris. In addition, an active control scheme is applied to designing the controllers of the flexible net. The debris dynamics, comprising translational and rotational dynamics, are constructed to simulate its motions throughout the whole process. The net capture dynamics, including the constitutive dynamics of the flexible net and the nonlinear contact dynamics with the debris, are established to simulate the movements of the flexible net.
In this paper, the authors focus on capturing irregular and rotating debris via a flexible net. Dragging space debris into the atmosphere to burn is an effective way to remove it. Space debris severely threatens the safety of spacecraft in near-earth orbit.
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