To address the challenges of deploying traditional industrial robots and mitigating high-risk manual operations in complex constrained environments such as earthquake rescue, aircraft maintenance, and nuclear facility inspection, hyper-redundant robots have emerged as a research focus due to their exceptional flexibility and environmental adaptability. However, conventional hyper-redundant manipulators based on universal joint-linkage structures exhibit limitations in redundant degrees of freedom and low actuation efficiency when traversing long-distance pipelines or isolation zones. An extensible arm structure design was innovatively proposed to reconfigure the distribution of degrees of freedom and optimize the kinematic model, enabling the robot to penetrate extended isolation areas while maintaining high-precision end-effector manipulation and compact coiling capability in standby mode. Furthermore, the workspace of the proposed robot was quantitatively analyzed using the Monte Carlo method, with experimental results demonstrating that the workspace volume of the extensible hyper-redundant manipulator is approximately 1.78 times that of conventional hyper-redundant arms. Finally, the flexible motion characteristics of the robotic arm's end-effector were validated through kinematic simulations and physical prototype experiments. The developed extensible hyper-redundant robotic system provides a technically advanced solution for detection and sampling tasks in complex confined environments with isolation barriers, offering significant advantages for applications in nuclear facility maintenance and aerospace inspection scenarios.
基于蒙特卡洛法(Monte Carlo Method),对关节空间q∈R15进行均匀采样,结合正向运动学模型生成末端执行器的三维点云分布如图12所示。仿真结果表明,该构型在无环境约束条件下可实现长、宽、高范围分别为2.66、2.61、2.63 m的半椭球形可达工作空间。通过伸缩杆自由度的运动,使得伸展式超冗余臂体的工作空间体积约为传统超冗余臂体的工作空间的1.78倍。
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