While most micro-robots face difficulty traveling on rugged and uneven terrain, beetles can walk smoothly on the complex substrate without slipping or getting stuck on the surface due to their stiffness-variable tarsi...
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Real-time and high-performance 3D object detection is of critical importance for autonomous driving. Recent top-performing 3D object detectors mainly rely on point-based or 3D voxel-based convolutions, which are both ...
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In this paper, we would present the structure of the teleoperation system of the Tiangong-2 Space Manipulator system. The system consist of on-orbit teleoperation and on-ground skill learning subsystem, and they meet ...
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ISBN:
(纸本)9781665405362
In this paper, we would present the structure of the teleoperation system of the Tiangong-2 Space Manipulator system. The system consist of on-orbit teleoperation and on-ground skill learning subsystem, and they meet the requirements of different tasks. Then, we also represented the keytechnology, the calibration method of the CyberGlve, of the two subsystem. And the experiments showed the methods are effective.
The accuracy of puncture has a significant impact on hr achy therapy. However, when the puncture needle enters the diseased tissue, there are complex forces between the needle body and soft tissue, resulting in the de...
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ISBN:
(纸本)9781665405362
The accuracy of puncture has a significant impact on hr achy therapy. However, when the puncture needle enters the diseased tissue, there are complex forces between the needle body and soft tissue, resulting in the deflection of the puncture needle, which affects the puncture accuracy. In order to improve the positioning accuracy and ensure better treatment effect, an adaptive step puncture strategy based on force feedback was proposed in this paper. Firstly, according to the process of brachytherapy, the mechanism design and control system design of puncture end tool were carried out. Secondly, combined with the end tool, the data acquisition platform was designed, the data acquisition and analysis were completed, and an adaptive step puncture strategy was proposed according to the experimental data. Finally, the experimental verification was carried out by using layered silica gel in the built data acquisition platform. Experiments showed that the adaptive step puncture strategy proposed in this paper significantly improves the puncture accuracy compared with direct puncture.
We present a conceptually simple, flexible, and efficient "Combine-and-Conquer" framework, CC-Det for object detection task. Our approach efficiently detects objects in an image by generating a keypoint heat...
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Learning from natural bacteria flagellum, we demonstrate a magnetic polymer multilayer conical microrobot that bestow the controllable propulsion upon external rotating magnetic field with uniform intensity. The magne...
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Variable camber wings have great potential to enhance the flight efficiency of aircraft due to their smooth and seamless surfaces. Nevertheless, how to address the precise deformation of the skin and the coordinated m...
Variable camber wings have great potential to enhance the flight efficiency of aircraft due to their smooth and seamless surfaces. Nevertheless, how to address the precise deformation of the skin and the coordinated movement between the mechanism and the structure poses a significant challenge. In this study, an optimization design method for the rigid-flexible coupled morphing leading edge is proposed, and a quasi-static kinematic model of the leading edge is established by combining the geometrically nonlinear deformation computational model of the flexible skin with the internal rigid driving mechanism equations of motion. The multi-objective optimization problem of the structural parameters of the rigid mechanism is solved with the optimization objectives of the highest driving accuracy and minimum driving force. The constitutive parameters were determined according to the ideal point method and verified by finite element simulation and ground test. The results show that the average error between the deformed shape of the optimized leading edge and the desired shape is 1.14 mm, and the maximum error is 3.51 mm, which proves the effectiveness of the proposed method in the design of morphing leading edges.
In the field of precision positioning and micro-manipulation, achieving high-precision motion with minimal hysteresis remains a significant challenge. In this paper, a symmetric high-precision 2-degree-of-freedom line...
In the field of precision positioning and micro-manipulation, achieving high-precision motion with minimal hysteresis remains a significant challenge. In this paper, a symmetric high-precision 2-degree-of-freedom linear piezoelectric platform (PEP) is proposed to address this issue. A single bonded-type piezoelectric actuator, utilizing fewer piezoelectric ceramic slices, drives the flexible stage to achieve two-dimensional motion with reduced hysteresis. The symmetric structural design eliminates long-term unbalanced loading, thereby enhancing mechanical stability. A hysteretic dynamics hybrid model of the PEP is established, and it is used to design the feedforward controller to achieve high accuracy. A prototype PEP has been fabricated for tests to verify its performances. The open-loop experiment results show that the proposed PEP has low hysteresis (7% hysteresis rate), high displacement resolution (3 nm), and can output ±9.7 μm × ±9.7 μm stroke. The closed-loop experimental results show that the repeated positioning precision of the PEP is ±6 nm, the hysteresis rate is 0.1%, and the relative trajectory tracking error is less than 0.07%. This work can broaden the application prospects of the PEP in precision positioning and micro-manipulation.
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