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2021 IEEE International Conference on Real-Time Computing and robotics, RCAR 2021

作者： Qi, Yuanyang Liu, Jincun Yu, Junzhi College of Engineering Peking University State Key Laboratory for Turbulence and Complex Systems BIC-ESAT Department of Advanced Manufacturing and Robotics Beijing100871 China College of Information and Electrical Engineering China Agricultural University Beijing100083 China

ISBN: (纸本)9781665436786

This paper proposes a fireworks algorithm based path planning method for amphibious robots that operate in terraqueous environments. Firstly, the amphibious path planning is formulated into a constrained optimization problem by coordinate transformation and line segmentation. Distance, energy consumption, and robot mode switching costs regarding the unconventional characteristics of the amphibious environment are considered. Secondly, the fireworks algorithm (FWA) and the bare bones fireworks algorithm (BBFWA) are briefly introduced. Finally, both methods have been implemented for solving the amphibious path planning problem. Simulation experiments have been conducted to explore the effectiveness and performance of both methods. Results indicate that our proposed path planning method for terraqueous environments is effective, and the fireworks algorithm outperforms the bare bones fireworks algorithm despite the latter surpasses several enhanced variants of the former on certain benchmarks. © 2021 IEEE.

关键词： Motion planning

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MM-LINS: a Multi-Map LiDAR-Inertial System for Over-Degenerate Environments

arXiv

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arXiv 2025年

作者： Ma, Yongxin Xu, Jie Yuan, Shenghai Zhi, Tian Yu, Wenlu Zhou, Jun Xie, Lihua School of Mechanical Engineering Shandong University Jinan250061 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of Education Jinan250061 China State Key Laboratory of Robotics and Systems Harbin Institute of Technology Harbin150001 China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Jiangsu Nanjing210016 China School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore

SLAM plays a crucial role in automation tasks, such as warehouse logistics, healthcare robotics, and restaurant delivery. These scenes come with various challenges, including navigating around crowds of people, dealing with flying plastic bags that can temporarily blind sensors, and addressing reduced LiDAR density caused by cooking smoke. Such scenarios can result in over-degeneracy, causing the map to drift. To address this issue, this paper presents a multi-map LiDAR-inertial system (MM-LINS) for the first time. The front-end employs an iterated error state Kalman filter for state estimation and introduces a reliable evaluation strategy for degeneracy detection. If over-degeneracy is detected, the active map will be stored into sleeping maps. Subsequently, the system continuously attempts to construct new maps using a dynamic initialization method to ensure successful initialization upon leaving the over-degeneracy. Regarding the back-end, the Scan Context descriptor is utilized to detect inter-map similarity. Upon successful recognition of a sleeping map that shares a common region with the active map, the overlapping trajectory region is utilized to constrain the positional transformation near the edge of the prior map. In response to this, a constraint-enhanced map fusion strategy is proposed to achieve high-precision positional and mapping results. Experiments have been conducted separately on both public datasets that exhibited over-degenerate conditions and in real-world environments. These tests demonstrated the effectiveness of MM-LINS in over-degeneracy environment. Our codes are open-sourced on Github 1 Copyright © 2025, The Authors. All rights reserved.

关键词： Plastic containers

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Biomechanical models in the lower-limb exoskeletons development: A review

TechRxiv

引用

TechRxiv 2023年

作者： Firouzi, Vahid Seyfarth, Andre Song, Seungmoon Von Stryk, Oskar Sharbafi, Maziar Ahmad Lauflabor Locomotion Laboratory Institute of Sport Science TU Darmstadt Germany Simulation Systems Optimization and Robotics Group Department of Computer Science TU Darmstadt Germany Mechanical and Industrial Engineering Northeastern University United States

Lower limb exoskeletons serve multiple purposes, like supporting and augmenting movement. Biomechanical models are practical tools to understand human movement, and motor control. This review explores the applications of biomechanical gait models in the development of lower-limb exoskeletons. Biomechanical models can be broadly categorized as conceptual and detailed models. Biomechanical models can be used for the design, control, and assessment of exoskeletons. Also, these models can be used to estimate unmeasurable or hard-to-measure variables, which is also useful within the aforementioned applications. The analysis of applications and research areas aims to inspire further advancements in this field and contribute to the development of more effective exoskeletons. We highlight validating simulation studies, improving the accuracy and fidelity of biomechanical models, and benefiting from exoskeletons to enhance or validate biomechanical models as future research areas related to biomechanical models. We also emphasize the exploration of model-based design and control approaches for exoskeletons targeting pathological gait, and utilizing biomechanical models for diverse design objectives of exoskeletons. Also, increasing the availability of open-source resources accelerates exoskeleton and biomechanical model advancement. Our review reveals existing needs and cracks new perspectives for the development of more usable and human-compatible exoskeletons based on biomechanical models. © 2023, CC BY.

关键词： Exoskeleton (robotics)

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End-to-end Semantic Segmentation Network for Low-Light Scenes

End-to-end Semantic Segmentation Network for Low-Light Scene...

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： Hongmin Mu Gang Zhang MengChu Zhou Zhengcai Cao College of Information Science and Technology Beijing University of Chemical Technology Beijing China Department of Macao Institute of Systems Engineering Macau University of Science and Technology Macao China Helen and John C. Hartmann Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA State Key Laboratory of Robotics and Systems Harbin Institute of Technology Harbin China

ISBN: (数字)9798350384574

ISBN: (纸本)9798350384581

In the fields of robotic perception and computer vision, achieving accurate semantic segmentation of low-light or nighttime scenes is challenging. This is primarily due to the limited visibility of objects and the reduced texture and color contrasts among them. To address the issue of limited visibility, we propose a hierarchical gated convolution unit, which simultaneously expands the receptive field and restores edge texture. To address the issue of reduced texture among objects, we propose a dual closed-loop bipartite matching algorithm to establish a total loss function consisting of the unsupervised illumination enhancement loss and supervised intersection-over-union loss, thus enabling the joint minimization of both losses via the Hungarian algorithm. We thus achieve end-to-end training for a semantic segmentation network especially suitable for handling low-light scenes. Experimental results demonstrate that the proposed network surpasses existing methods on the Cityscapes dataset and notably outperforms state-of-the-art methods on both Dark Zurich and Nighttime Driving datasets.

关键词： Training Computer vision Accuracy Convolution Semantic segmentation Lighting Logic gates

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Environment-Driven Online LiDAR-Camera Extrinsic Calibration

arXiv

引用

arXiv 2025年

作者： Huang, Zhiwei Li, Jiaqi Zhong, Ping Fan, Rui The Department of Control Science & Engineering The College of Electronics & Information Engineering Tongji University Shanghai201804 China The School of Computer Science and Engineering Central South University Hunan Changsha410083 China The National Key Laboratory of Science and Technology on Automatic Target Recognition National University of Defense Technology Hunan Changsha410073 China The Department of Control Science & Engineering The College of Electronics & Information Engineering Shanghai Research Institute for Intelligent Autonomous Systems The State Key Laboratory of Intelligent Autonomous Systems Frontiers Science Center for Intelligent Autonomous Systems Tongji University Shanghai201804 China The National Key Laboratory of Human-Machine Hybrid Augmented Intelligence Institute of Artificial Intelligence and Robotics Xi’an Jiaotong University Shaanxi Xi’an710049 China

LiDAR-camera extrinsic calibration (LCEC) is the core for data fusion in computer vision. Existing methods typically rely on customized calibration targets or fixed scene types, lacking the flexibility to handle variations in sensor data and environmental contexts. This paper introduces EdO-LCEC, the first environment-driven, online calibration approach that achieves human-like adaptability. Inspired by the human perceptual system, EdO-LCEC incorporates a generalizable scene discriminator to actively interpret environmental conditions, creating multiple virtual cameras that capture detailed spatial and textural information. To overcome cross-modal feature matching challenges between LiDAR and camera, we propose dual-path correspondence matching (DPCM), which leverages both structural and textural consistency to achieve reliable 3D-2D correspondences. Our approach formulates the calibration process as a spatial-temporal joint optimization problem, utilizing global constraints from multiple views and scenes to improve accuracy, particularly in sparse or partially overlapping sensor views. Extensive experiments on real-world datasets demonstrate that EdO-LCEC achieves state-of-the-art performance, providing reliable and precise calibration across diverse, challenging environments. Copyright © 2025, The Authors. All rights reserved.

关键词： Spatio-temporal data

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Simulator Design Using a General Purpose PC and Off-The-Shelf Interface Boards for GNSS/INS Integrated Navigation System

Simulator Design Using a General Purpose PC and Off-The-Shel...

引用

International Conference on Control, Automation and systems ( ICCAS)

作者： Jae Hoon Son Yeong Hye Lee Junwoo Jurug Yongtaek Hwang Jiwoo Hwang Minsu Kim Gyeongmin Park JunMin Park Hoyoung Yoo Chansik Park Sang Heon Oh Sang Jeong Lee Dong-Hwan Hwang Department of Electronics Engineering Chungnam National University Daejeon Korea Department of Intelligent Systems & Robotics Chungbuk National University Daejeon Korea Advanced Technology Laboratory Microinfinity Co. Ltd. Daejeon Korea

When a navigation systems are developed, lots of tests have to be performed. If a simulator is available which can generate signal and data of real environment, huge amount of time and cost can be reduced for development. In this paper, a simulator design method is proposed for GNSS/INS integrated navigation system using a general-purpose PC and OTS interface boards. In order to verify the proposed design method, a simulator of GPS L1 C/A and HG1700AG58 is implemented using a PC with intel i7-8700 CPU, USRP 2952-R, PCI-1780U-AE, FSCC/4-PCIe and LabVIEW2015. The implementation results show that GNSS signal and IMU data can be used for GNSS/INS integrated navigation system design.

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A Vision-Based Two-Stage Fruit Outer Diameter Detection Method

A Vision-Based Two-Stage Fruit Outer Diameter Detection Meth...

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IEEE International Conference on robotics and Biomimetics

作者： Yifei Hao Shuaizheng Yan Zhengxing Wu Bingwei He Chenghua Li Junzhi Yu Department of Mechanical Engineering Fuzhou University Fuzhou China Laboratory of Cognitive and Decision Intelligence for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China Key Laboratory of Cognition and Decision Intelligence for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China Guangzhou Shenghui Cleaning Service Co. Ltd. Guangzhou China Department of Advanced Manufacturing and Robotics State Key Laboratory for Turbulence and Complex Systems BIC-ESAT College of Engineering Peking University Beijing China

ISBN: (数字)9798331509644

ISBN: (纸本)9798331509651

Regarding the mobile monitoring system in agricultural automation, the outer diameter monitoring of greenhouse vegetables has significant implications for accurately regulating fruit growth and cultivation plans. In this paper, a novel vision-based two-stage outer diameter detection method is proposed, including the segmentation and outer diameter calculation of greenhouse tomato images. To address the issues of multiple tomatoes in a single image and the similarity in color between tomatoes and the background, a YOLOv8 network embedded with convolutional block attention module is constructed for detection and segmentation in the first stage. Additionally, to solve the problem of inaccurate outer diameter detection caused by different tomato poses and pedicles, a defined central axis method is proposed, which can adaptively filter out the maximum outer diameter candidates and calculate accurate values utilizing depth information in the world coordinate system. The backbone network is fine-tuned on the pre-trained YOLOv8 model with 1000 tomato images. Extensive measurement experiments, involving 215 tomatoes in 80 images, is conducted to validate the effectiveness of our proposed approach. Compared to the ground truth, we obtain a measurement error of 4.27 mm, the coefficient of determination value R2 is 0.9349.

关键词： Image segmentation Measurement errors Adaptation models Automation Image color analysis Robot kinematics Biomimetics Adaptive filters Information filters Monitoring

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自主水下直升机——海洋探测的新平台

引用

engineering 2023年第6期25卷 21-27页

作者：周晶黄豪彩黄善和司玉林石凯全向前郭春雷陈振纬王智鲲王英强王章霖蔡成业胡若愚荣振威何佳钟刘鸣陈鹰 Intelligent Ocean Technology Center Zhejiang UniversityZhoushan 316021China College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Ocean College Zhejiang UniversityZhoushan 316021China State Key Laboratory of Fluid Power&Mechatronic Systems Zhejiang UniversityHangzhou 310027China State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110169China Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanya 572000China

The demand for ocean exploration down to the deep seafloor,for instance,ocean resource exploration and ocean observations,has promoted innovations in underwater *** unmanned vehicles are urgently required to be deployed and operate on the *** most underwater vehicles are unable to operate on the seafloor and even have difficulty reaching there,we developed a seafloor-resident autonomous underwater helicopter(AUH).This paper introduces the new idea and design of AUHs and discusses the pros and cons of AUHs in comparison with other underwater ***,we verify the importance of developing new facilities to enable mankind to easily operate close to the seafloor.

关键词：海洋探测 ocean underwater

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Transcranial Direct Current Stimulation Associated with Visual and Auditory Cueing during Gait Training: A Case Study with a Parkinson's Disease Patient

Transcranial Direct Current Stimulation Associated with Visu...

引用

IEEE/RAS-EMBS International Conference on Biomedical robotics and Biomechatronics (BioRob)

作者： Angie Pino Patricio Barria Karim Baleta Rolando Aguilar José M. Azorín Marcela Múnera Carlos A. Cifuentes Club de Leones Cruz del Sur Rehabilitation Center Punta Arenas Chile Department of Electrical Engineering University of Magallanes Punta Arenas Chile Department of Systems Engineering and Automation Miguel Hernández University of Elche Elche Spain Bristol Robotics Laboratory University of the West of England Bristol UK

ISBN: (数字)9798350386523

ISBN: (纸本)9798350386530

Parkinson's Disease (PD) is a neurodegenerative disorder that leads to motor dysfunctions and restricts walking independence. Approaches such as transcranial direct current stimulation (tDCS) and cueing gait are potential rehabilitation strategies that have proven efficient in improving motor function in individuals with PD in preliminary and separate studies. This case study with a single PD patient explores the feasibility and potential effects of combining anodal tDCS (a-tDCS) with visual and auditory cues during 15 gait training sessions. The patient was assessed before the first intervention and after completing all training weeks regarding kinematic parameters of gait, neuronal activation, muscle strength, and functional skills. Results showed a beneficial impact in significantly increasing the participant's speed, stride length, step length, and muscle strength. Furthermore, the decrease in beta brain activity and increase in the delta were associated with a reduction in the effects of the disease, improved motor performance, and shorter functional task times. This study suggests the a-tDCS strategy with double cueing gait can lead to therapeutic potential in relieving the disease's motor symptoms.

关键词： Training Visualization Motor drives Parkinson's disease Kinematics Muscles Motors Neurorehabilitation Transcranial direct current stimulation Robots

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The Stiffness of 3-PRS PM Across Parasitic and Orientational Workspace

arXiv

引用

arXiv 2024年

作者： Nigatu, Hassen Jihao, Li Zhu, Keqi Zhang, Junhan Guo, Haotian Lu, Guodong Kim, Doik Robot Perception and Grasp Lab School of Mechanical Engineering Zhejiang University Hangzhou310027 China Robotics Research Center of Yuyao Robotics Institute Zhejiang University Yuyao Technology Innovation Center No.479 Ye Shan Road Yuyao Zhejiang Province Ningbo China The State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical Engineering The Engineering Research Center for Design Engineering and Digital Twin of Zhejiang Province Zhejiang University Hangzhou310027 China Korea Republic of

This study investigates the stiffness characteristics of the Sprint Z3 head, also known as 3-PRS Parallel Kinematics Machines, which are among the most extensively researched and viably successful manipulators for precision machining applications. Despite the wealth of research on these robotic manipulators, no previous work has demonstrated their stiffness performance within the parasitic motion space. Such an undesired motion influences their stiffness properties, as stiffness is configuration-dependent. Addressing this gap, this paper develops a stiffness model that accounts for both the velocity-level parasitic motion space and the regular workspace. Numerical simulations are provided to illustrate the stiffness characteristics of the manipulator across all considered spaces. The results indicate that the stiffness profile within the parasitic motion space is both shallower and the values are smaller when compared to the stiffness distribution across the orientation workspace. This implies that evaluating a manipulator’s performance adequately requires assessing its ability to resist external loads during parasitic motion. Therefore, comprehending this aspect is crucial for redesigning components to enhance overall stiffness. © 2024, CC BY.

关键词： Manipulators

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