This study explores the conceptual design of virtual avatars in autonomous driving and their trigger mechanisms in the context of the intelligent Human-Machine Interface (HMI). Through the intelligent system's per...
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Existing motion intent recognition systems in lower limb rehabilitation robots primarily rely on the fusion of multiple sensor features. Such systems capture the motion characteristics of healthy volunteers during spe...
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ISBN:
(纸本)9798350352900;9798350352894
Existing motion intent recognition systems in lower limb rehabilitation robots primarily rely on the fusion of multiple sensor features. Such systems capture the motion characteristics of healthy volunteers during specific m ovements a nd t hen process the data using machine learning algorithms to accurately recognize human motion events, such as forward and backward movements. We address the complexity and inaccuracies of current intent recognition systems by synthesizing feedback from rehabilitation physicians and patients and adopting modular design principles to develop an integrated human motion intent recognition system for lower limb rehabilitation robots. The system utilizes dual physical sensors to collect data on the movement characteristics of the patient's waist, abdomen, and shoulders, which are then classified using the Transformer-LSTM algorithm. The dataset employed for training and testing the algorithm was gathered from a tertiary care hospital, focusing on the movement characteristics of patients with functional hemiplegia of the lower extremities. Clinical trial results demonstrated that the Transformer-LSTM algorithm achieved an average classification accuracy of 97.54% in recognizing human lower limb movement events, compared to 87.48% with the LSTM algorithm. This lower limb rehabilitation robot also significantly enhances patient motivation and comfort during training.
Dexterous in-hand manipulation is an essential skill of production and life. However, the highly stiff and mutable nature of contacts limits real-time contact detection and inference, degrading the performance of mode...
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ISBN:
(纸本)9798350377712;9798350377705
Dexterous in-hand manipulation is an essential skill of production and life. However, the highly stiff and mutable nature of contacts limits real-time contact detection and inference, degrading the performance of model-based methods. Inspired by recent advances in contact-rich locomotion and manipulation, this paper proposes a novel model-based approach to control dexterous in-hand manipulation and overcome the current limitations. The proposed approach has an attractive feature, which allows the robot to robustly perform long-horizon in-hand manipulation without predefined contact sequences or separate planning procedures. Specifically, we design a high-level contact-implicit model predictive controller to generate real-time contact plans executed by the low-level tracking controller. Compared to other model-based methods, such a long-horizon feature enables replanning and robust execution of contact-rich motions to achieve large displacements in-hand manipulation more efficiently;Compared to existing learning-based methods, the proposed approach achieves dexterity and also generalizes to different objects without any pre-training. Detailed simulations and ablation studies demonstrate the efficiency and effectiveness of our method. It runs at 20Hz on the 23-degree-of-freedom, long-horizon, in-hand object rotation task.
This paper proposes a novel Internet architecture for IoT frameworks that integrates the Synapse Algorithm for intelligent energy management in smart homes. Current IoT energy management systems often face challenges ...
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Exoskeleton locomotion must be robust while being adaptive to different users with and without payloads. To address these challenges, this work introduces a data-driven predictive control (DDPC) framework to synthesiz...
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ISBN:
(纸本)9798350377712;9798350377705
Exoskeleton locomotion must be robust while being adaptive to different users with and without payloads. To address these challenges, this work introduces a data-driven predictive control (DDPC) framework to synthesize walking gaits for lower-body exoskeletons, employing Hankel matrices and a state transition matrix for its data-driven model. The proposed approach leverages DDPC through a multi-layer architecture. At the top layer, DDPC serves as a planner employing Hankel matrices and a state transition matrix to generate a data-driven model that can learn and adapt to varying users and payloads. At the lower layer, our method incorporates inverse kinematics and passivity-based control to map the planned trajectory from DDPC into the full-order states of the lower-body exoskeleton. We validate the effectiveness of this approach through numerical simulations and hardware experiments conducted on the Atalante lower-body exoskeleton with different payloads. Moreover, we conducted a comparative analysis against the model predictive control (MPC) framework based on the reduced-order linear inverted pendulum (LIP) model. Through this comparison, the paper demonstrates that DDPC enables robust bipedal walking at various velocities while accounting for model uncertainties and unknown perturbations.
Anomaly-based intelligent intrusion detection systems (IDS) employ advanced algorithms and deep learning (DL) techniques to monitor network traffic, system behavior, and user activities in real-time. By creating a bas...
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Magnetic continuum robots are subject to external magnetic fields and deformed remotely, simplifying the robot's transmission mechanism and providing it with significant potential for miniaturization and operation...
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ISBN:
(纸本)9798350377712;9798350377705
Magnetic continuum robots are subject to external magnetic fields and deformed remotely, simplifying the robot's transmission mechanism and providing it with significant potential for miniaturization and operational flexibility. However, modeling magnetic field distribution generated by permanent magnets is complex and requires time-consuming pre-calibrations. Moreover, it is highly susceptible to environments with ferromagnetic materials, posing significant challenges for the control of magnetic continuum robots. In response, we propose an approach that does not overly focus on the magnetic field distribution but instead directly learns the inverse kinematics of magnetic continuum robots end-to-end. Binding the robot's configuration to the pose of external magnets, precise control of continuum robots is facilitated. Additionally, we leverage teleoperation techniques to broaden the applicability of this method. By mounting magnets on a robotic arm and directly utilizing the target pose of the external magnet predicted by a multi-layer perceptron (MLP), we achieve the operation and navigation of magnetic continuum robots in complex environments. Experiments demonstrate that the mean control accuracy along the robot using our learning-based inverse kinematics is about half of the robot's diameter.
Tensegrity robots, composed of rigid rods and flexible cables, exhibit high strength-to-weight ratios and significant deformations, which enable them to navigate unstructured terrains and survive harsh impacts. They a...
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ISBN:
(纸本)9781665491907
Tensegrity robots, composed of rigid rods and flexible cables, exhibit high strength-to-weight ratios and significant deformations, which enable them to navigate unstructured terrains and survive harsh impacts. They are hard to control, however, due to high dimensionality, complex dynamics, and a coupled architecture. Physics-based simulation is a promising avenue for developing locomotion policies that can be transferred to real robots. Nevertheless, modeling tensegrity robots is a complex task due to a substantial sim2real gap. To address this issue, this paper describes a Real2Sim2Real (R2S2R) strategy for tensegrity robots. This strategy is based on a differentiable physics engine that can be trained given limited data from a real robot. These data include offline measurements of physical properties, such as mass and geometry for various robot components, and the observation of a trajectory using a random control policy. With the data from the real robot, the engine can be iteratively refined and used to discover locomotion policies that are directly transferable to the real robot. Beyond the R2S2R pipeline, key contributions of this work include computing non-zero gradients at contact points, a loss function for matching tensegrity locomotion gaits, and a trajectory segmentation technique that avoids conflicts in gradient evaluation during training. Multiple iterations of the R2S2R process are demonstrated and evaluated on a real 3-bar tensegrity robot.
This paper presents the design and development of an onboard intelligent device based on Jetson Xavier NX. The device utilizes the computational and recognition capabilities of AI chips to analyze safety signs and pro...
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Uncertainties complicate the task of designing optimal controllers for complex systems. This work introduces FMUGym, a novel open source interface that connects reinforcement learning libraries following the Gymnasium...
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