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7th Annual International Conference on Network and Information systems for Computers, ICNISC 2021

作者： Zang, Xizhe Wang, Chao Zhang, Pu Heng, Shuai Zhao, Jie State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China Zhejiang Lab Hangzhou311121 China

ISBN: (纸本)9781665402323

As robots are gradually used in more and more scenarios, the requirements for robots to complete a variety of complex tasks are becoming higher and higher. Robotic hands, as the important tool for robot to complete the task, has attracted more and more attention. However, the robotic grasping tool usually has a single function and few degrees of freedom, which makes it difficult to adapt to more complex application scenarios. This paper presented a novel robotic hand with four fingers, which is designed based on the characteristics of human hands. We introduced the design process of the finger structure, analyzed the kinematics and statics of the designed hand, and further manufactured the prototype. To verify the function of the designed multi-fingered hand, we designed a serial of grasping experiments for different objects. The experimental results show that the designed multi-fingered hand can successfully grasp different experimental objects and meet the grasping requirements of the robot. © 2021 IEEE.

关键词： Degrees of freedom (mechanics)

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Passive Suspension Design and Dynamics Analysis of Manned Lunar Rover

Passive Suspension Design and Dynamics Analysis of Manned Lu...

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Mechatronics and robotics Engineering (ICMRE), International Conference on

作者： Junyang Zhang Zhen Liu Zhonghao Qin State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China Special Robot Equipment Group Harbin Institute of Technology Zhengzhou Research Institute Harbin China

ISBN: (数字)9798350394276

ISBN: (纸本)9798350394283

The lunar surface environment differs significantly from that of Earth, thus necessitating the specialized design of suspension systems for lunar rovers. Within this study, a double wishbone independent suspension system is specifically designed for a manned lunar rover, with its dynamics attributes investigated through theoretical analyses and simulations. Firstly, the structural parameters of the double wishbone suspension are designed. Secondly, the theoretical dynamics model of the suspension is established, the dynamics equations are deduced, and an exploration into the impact of diverse system parameters on the suspension’s dynamics performance is conducted. Finally, the suspension underwent multi-body dynamics analysis using ADAMS to verify compliance with specified requirements for obstacle-crossing performance.

关键词： Space vehicles Suspensions (mechanical systems) Analytical models Mechatronics Moon Mathematical models Shock absorbers

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A Trajectory Planning Framework for Experimental Module Manipulator On-Orbit Servicing

A Trajectory Planning Framework for Experimental Module Mani...

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IEEE International Conference on robotics and Biomimetics

作者： Boyu Ma Baoshi Cao Yang Liu Yuteng Xie Xiaohang Yang Wei Wang Handong Hu Xiaokai Zhou Yiming Ji Zhengpu Wang Mengfei Li Haoran Sun Wandong Sun Zongwu Xie State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China School of Resources and Environment Northeast Agricultural University Harbin China

This article proposes a novel trajectory planning framework for the Experimental Module Manipulator (EMM) on-orbit servicing (OOS). For a start, the simulation system of the EMM based on Open Inventor is developed, and the trajectory planning technical route of the EMM for OOS missions is illustrated, including two main phases: large-scale transfer and small-scale approach. Before trajectory planning, the Gilbert–Johnson–Keerthi convex bounding boxes of the CSS and the EMM are modeled. Moreover, we present a Cartesian-space collision-free planning scheme. For the different task requirements in the above two phases, two corresponding collision-free trajectory planning schemes in joint space are proposed. Finally, simulations of the EMM supporting an astronaut extra-vehicular activity verify the effectiveness of our trajectory planning framework and all of the schemes presented in this article.

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Research on Low-Force Cutting Load Characteristics for Lunar Rock Simulant

Research on Low-Force Cutting Load Characteristics for Lunar...

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2021 International Conference on Computer Graphics, Artificial Intelligence, and Data Processing, ICCAID 2021

作者： Wang, Yizhuo Li, Peng Xu, Bo Liu, Junwei Mechanical Engineering College Beihua University Jilin132022 China Mechanical Engineering College Yanshan University Qinhuangdao066004 China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China

ISBN: (数字)9781510652170

ISBN: (纸本)9781510652163

In the whole lunar regolith drilling and sampling task, It is critical to make the operation of the drilling and sampling system efficient and reliable. In view of the high efficiency drilling requirements of lunar rock under low-force conditions, it is necessary to study the mechanical properties of an elemental blade and lunar rock. Firstly, a test platform is developed to test the low-force cutting load characteristics for the lunar rock simulant according to the requirements of the cutting load characteristics test function. Then, the linear cutting load and impact crushing load characteristics for the lunar rock simulant are tested and verified respectively. It is finally found that the cutting load of the lunar rock simulant can be reduced by increasing the cutting edge rake angle and side rake angle and improving the percussive frequency. This provides a certain reference for setting the operating parameters of lunar rock core drilling tools to achieve high performance drilling under low-force conditions. © 2022 SPIE.

关键词： Rocks

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Obstacle Identification Based on Deep Learning for Inspection Robot of FAST Wire Rope

Obstacle Identification Based on Deep Learning for Inspectio...

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Automation, robotics and Computer Engineering (ICARCE), International Conference on

作者： Chengxu Yang Xiangyu Sun Gangfeng Liu School of Mechatronics Engineering Harbin Institute of Technology Harbin China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China

In this paper, for the requirements of image recognition and localization of the obstacles existing on the moving path in the inspection task of FAST cable inspection robot, the deep learning method is used to realize the recognition of multi-kind and multi-scale obstacles. The obstacles on FAST wire rope have not been identified before. By enhancing the data set and improving the network model, the recognition accuracy and speed are both improved, which meets the efficiency and accuracy requirements of obstacle detection on the wire rope, and provides help for the subsequent robot pace planning and overhaul tasks.

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DeepMatcher: A Deep Transformer-based Network for Robust and Accurate Local Feature Matching

arXiv

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arXiv 2023年

作者： Xie, Tao Dai, Kun Wang, Ke Li, Ruifeng Zhao, Lijun State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150006 China SenseTime Group Inc. Beijing100080 China

Local feature matching between images remains a challenging task, especially in the presence of significant appearance variations, e.g., extreme viewpoint changes. In this work, we propose DeepMatcher, a deep Transformer-based network built upon our investigation of local feature matching in detector-free methods. The key insight is that local feature matcher with deep layers can capture more human-intuitive and simpler-to-match features. Based on this, we propose a Slimming Transformer (SlimFormer) dedicated for DeepMatcher, which leverages vector-based attention to model relevance among all keypoints and achieves long-range context aggregation in an efficient and effective manner. A relative position encoding is applied to each SlimFormer so as to explicitly disclose relative distance information, further improving the representation of keypoints. A layer-scale strategy is also employed in each SlimFormer to enable the network to assimilate message exchange from the residual block adaptively, thus allowing it to simulate the human behaviour that humans can acquire different matching cues each time they scan an image pair. To facilitate a better adaption of the SlimFormer, we introduce a Feature Transition Module (FTM) to ensure a smooth transition in feature scopes with different receptive fields. By interleaving the self- and cross-SlimFormer multiple times, DeepMatcher can easily establish pixel-wise dense matches at coarse level. Finally, we perceive the match refinement as a combination of classification and regression problems and design Fine Matches Module to predict confidence and offset concurrently, thereby generating robust and accurate matches. Experimentally, we show that DeepMatcher significantly outperforms the state-of-the-art methods on several benchmarks, demonstrating the superior matching capability of DeepMatcher. The code is available at https://***/XT1997/DeepMatcher. © 2023, CC BY.

关键词： Behavioral research

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Study of the shear strength behavior in flip chip under thermo-mechano-electrical coupling and different solder height

Study of the shear strength behavior in flip chip under ther...

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International Conference on (ICEPT) Electronic Packaging Technology

作者： Bin Zhou Jianxin Qiao Yunkang Su Dapeng Liu Wentao Huang Longqiu Li State Key Laboratory of Robotics and System Key Laboratory for Microsystems and Microstructure Manufacturing Harbin Institute of Technology Harbin China School of Mechanical and Electrical Engineering Harbin Institute of Technology Harbin China

Complicated service environment such as thermo-mechano-electrical coupling field and limited solder height have brought great challenges to the reliability of flip chips packaging and hindered the chip integration process. In this work, mechanical properties of 3.0Ag-0.5Cu(SAC305) solder under different service environment and height were investigated at macroscopic and microcosmic level. The flip chip shear test is realized on the universal test machine use the proposed fixture. The shear strength shows declining trend with the increment of coupling fields and solder heights. The underlying mechanism of strength loss is thermal softening effect and reduction rate could reach 42.77% at most. The Scanning Electron Microscopy (SEM) is used to analysis the fracture morphology and intermetallic compound (IMC) layer. The shear strength was negatively correlated with the thickness of IMC layer, and was positively correlated with fractal dimension of fracture morphology. The result shows that the thickness of IMC layer is the highest while the field is thermo-mechano-electrical and the solid height is 398μm. Meanwhile, the fractal dimension of fracture morphology is the lowest.

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OAMatcher: An Overlapping Areas-based Network for Accurate Local Feature Matching

arXiv

引用

arXiv 2023年

作者： Dai, Kun Xie, Tao Wang, Ke Jiang, Zhiqiang Li, Ruifeng Zhao, Lijun State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150006 China SenseTime Group Inc. Beijing100080 China

Local feature matching is an essential component in many visual applications. In this work, we propose OAMatcher, a Tranformer-based detector-free method that imitates humans behavior to generate dense and accurate matches. Firstly, OAMatcher predicts overlapping areas to promote effective and clean global context aggregation, with the key insight that humans focus on the overlapping areas instead of the entire images after multiple observations when matching keypoints in image pairs. Technically, we first perform global information integration across all keypoints to imitate the humans behavior of observing the entire images at the beginning of feature matching. Then, we propose Overlapping Areas Prediction Module (OAPM) to capture the keypoints in co-visible regions and conduct feature enhancement among them to simulate that humans transit the focus regions from the entire images to overlapping regions, hence realizeing effective information exchange without the interference coming from the keypoints in non-overlapping areas. Besides, since humans tend to leverage probability to determine whether the match labels are correct or not, we propose a Match Labels Weight Strategy (MLWS) to generate the coefficients used to appraise the reliability of the ground-truth match labels, while alleviating the influence of measurement noise coming from the data. Moreover, we integrate depth-wise convolution into Tranformer encoder layers to ensure OAMatcher extracts local and global feature representation concurrently. Comprehensive experiments demonstrate that OAMatcher outperforms the state-of-the-art methods on several benchmarks, while exhibiting excellent robustness to extreme appearance variants. The source code is available at https://***/DK-HU/OAMatcher. © 2023, CC BY.

关键词： Image enhancement

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PetLock:A Genderless and Standard Interface for the Future On-orbit Construction

arXiv

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arXiv 2022年

作者： Li, Yuntao Xu, Zichun Yang, Xiaohang Zhao, Zhiyuan Zhao, Jingdong Liu, Hong State Key Laboratory of Robotics and System Harbin Institute of Technology Heilong Jiang Harbin China

Modular design is the foundation of on orbit construction technology of large space facilities in the future. Standard interface is the key technology of modular design of the future space robotic systems and space facilities. This paper presents the designed and tested of PetLock, a standard and genderless interface which can transfer mechanical loads, power and data between the future modular space robotic manipulator and spacecraft. PetLock adopts a completely genderless design, including connection face, locking mechanism, data and power interface. The connection surface provides a large translation and rotation misalignment tolerance, due to its 120-degree symmetrical and 3D shape design. The locking mechanism features the three locking pins retraction structure design, which is simple and reliable. POGO pin connectors in the center of the interface provides the power and data transfer capabilities. Due to the advantages of high locking force, large tolerance, high reliability and low cost, PetLock has the very big application potential in future on orbit construction missions. Copyright © 2022, The Authors. All rights reserved.

关键词： Fits and tolerances

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On the Passive Virtual Viscous Element Injection Method for Elastic Joint Robots

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IEEE Transactions on robotics 2025年 41卷 4078-4099页

作者： Zhang, Jiexin Hou, Tengyu Ding, Ye Zhang, Bo Liu, Honghai Huazhong University of Science and Technology State Key Laboratory of Intelligent Manufacturing Equipment and Technology Hubei Wuhan 430074 China School of Mechanical Engineering State Key Laboratory of Mechanical System and Vibration Shanghai 200240 China Shanghai Jiao Tong University State Key Laboratory of Mechanical System and Vibration Shanghai 200240 China Harbin Institute of Technology Shenzhen State Key Laboratory of Robotics and Systems Shenzhen 518055 China Peng Cheng Laboratory Shenzhen 518000 China

Increasing the viscosity of elastic joints can significantly improve the performance of elastic joint robots during physical human–robot interactions. However, current approaches for injecting viscous elements require an additional damper to be added in parallel with the elastic elements. In this paper, we propose a new concept called virtual viscous element injection (VVI), which enables a robot to exhibit viscoelasticity without altering its mechanical structure. VVI relies only on motor-side dynamics reshaping and state feedback. Interestingly, the VVI method allows high-resolution joint torque measurements in elastic joint robots, unlike in physical viscoelastic joint robots, which measure joint torque using higher-order derivatives of the positions. Furthermore, the VVI method is proved to preserve the passivity of robot dynamics, which provides numerous possibilities for the applications of combined passivity-based controllers. Specifically, we first emphasize the impedance control method using VVI. The results demonstrate that the VVI-DF method, which combines the direct feedback (DF) method with VVI, addresses the issue of excessive acceleration feedback in the controller. This provides looser constraints for achieving a high-gain torque loop in impedance control. Moreover, this paper also provides examples of the application of VVI combined with passivity-based position and torque controllers. Experiments and simulations demonstrate the effectiveness of the proposed methods. The proposed method can be extended to various robots, such as exoskeletons, and collaborative robots. © 2004-2012 IEEE.

关键词： elastic joint robots impedance control passivity-based control physical human-robot interaction Virtual viscous element injection

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