{"title":"Design and Energy Consumption Optimization of an Automatic Hybrid Sailboat","authors":"Rong-Shyang Ou, Cheng Liang, X. Ji, Huihuan Qian","doi":"10.1109/RCAR52367.2021.9517339","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517339","url":null,"abstract":"To perform high endurance ocean cruise mission, energy is of paramount importance for Autonomous Surface Vehicles (ASVs). Autonomous sailboats, as a new type of ASV, can provide an energy-saving solution. However, conventional autonomous sailboats have low mobility in complex marine environment. Hybrid sailboat, which is equipped with an auxiliary electric propulsion system, can solve both energy and mobility problems. To achieve ocean cruise mission, the energy consumption of hybrid sailboat needs to be optimized. In this paper, the control method of the hybrid system is redesigned to address this problem. Moreover, to solve the problem of sideways drift when sailing upwind, the course stability of hybrid sailboat needs to be enhanced. This paper presents an efficient design optimization to reduce leeway angle. Notably, the leeway angle can be reduced by 55.4% and about 58.9% of energy is saved on average. Our optimization strategy can enable hybrid sailboat to sail more stable and longer.","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125751213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jie Cheng, Shengpei Ding, Hongjun Yang, Xuexin Zhang, Tairen Sun
{"title":"Saturated nonlinear control of robots with series elastic actuators","authors":"Jie Cheng, Shengpei Ding, Hongjun Yang, Xuexin Zhang, Tairen Sun","doi":"10.1109/RCAR52367.2021.9517535","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517535","url":null,"abstract":"In this paper, two saturated nonlinear control strategies are proposed for regulation of SEA-driven robots based on singular perturbation (SP) and Energy Shaping (ES). The SP-based saturated controller is designed with two saturated control terms for cascaded two subsystems, and the ES-based saturated controller is proposed by a saturated PD control term plus a static gravity compensator. In comparison of the two controllers, the SP-based saturated controller requires the stiffness being relative large, while the ES-based saturated controller requires accurate stiffness knowledge. Satisfaction of the control saturation is guaranteed by using the hyperbolic tangent function in controllers design. Asymptotical control stability is analyzed using the Hoppensteadts Theorem and the Krasovskii-LaSalle theorem, and the control effectiveness is illustrated by simulations and experiments.","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130880865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Finger Joint Angle Estimation based on sEMG signals and deep learning method","authors":"Chenfei Ma, Weiyu Guo, Lisheng Xu, Guanglin Li","doi":"10.1109/RCAR52367.2021.9517643","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517643","url":null,"abstract":"Conventional movement recognition methods are normally based on classification algorithms, which could only provide discrete movement classification rather than natural human body continuous movements. In this paper, we utilized the deep learning methods to estimate eight complicated movements of fingers by extracting the kinematic information based on surface electromyographic (sEMG) signals. Aiming at realizing continuous estimation, we adopted four representative models, AlexNet, Residual neural network (ResNet), Long Short-term Memory network (LSTM) and Gate Recurrent Unit (GRU) in this study. Convolutional kind models (AlexNet and ResNet) are chosen because of their irreplaceable feature extraction ability. And recurrent kind models (LSTM and GRU) are chosen because they are suitable for time-series signal processing. We took 10 degrees of freedom (DoFs) of joint angles from one hand as the target, 12 channels of sEMG as input and trained the models with the stochastic gradient descent and backpropagation. The models were tested on 8 abled subjects. The results indicated that the employed AlexNet turned out to show the best estimation performance and stability than other models. We realized the AlexNet is more suitable for sEMG based continuous movement estimation.","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130086911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tingting Mi, D. Que, Senlin Fang, Zhenning Zhou, Chaoxiang Ye, Chengliang Liu, Zhengkun Yi, Xinyu Wu
{"title":"Tactile Grasp Stability Classification Based on Graph Convolutional Networks","authors":"Tingting Mi, D. Que, Senlin Fang, Zhenning Zhou, Chaoxiang Ye, Chengliang Liu, Zhengkun Yi, Xinyu Wu","doi":"10.1109/RCAR52367.2021.9517085","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517085","url":null,"abstract":"One of the challenges for robots to grasp unknown objects is to predict whether objects will fall at the beginning of grasping. Evaluating robotic grasp state accurately and efficiently is a significant step to address this issue. In this paper, based on the different fusion approaches of multi-sensor tactile signals, we propose two novel methods based on Graph Convolution Network (GCN) for robotic stability classification. Specifically, we propose two deep learning methods including GCN based on data-level fusion (GCN-DF) and GCN based on feature-level fusion (GCN-FF). We explore the optimal parameters for transforming sensor signals into a graph structure. Furthermore, we verify the effectiveness of the proposed methods on the BioTac Grasp Stability (BiGS) dataset. The experimental results prove that the proposed approaches achieve higher classification accuracy than Support Vector Machine (SVM) and Long Short-Term Memory (LSTM).","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121987605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiya Zhang, Shan Wang, D. Gao, Yan Zhao, G. Lin, Xin Peng
{"title":"Research on Diameter Prediction of Silicon Single Crystal Based on Data Driven","authors":"Xiya Zhang, Shan Wang, D. Gao, Yan Zhao, G. Lin, Xin Peng","doi":"10.1109/RCAR52367.2021.9517426","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517426","url":null,"abstract":"Czochralski silicon single crystal growth is a dynamic time-varying process with multi-field and multi-phase coupling, complex physical changes, nonlinearity and large hysteresis, but the mechanism model based on a large number of assumptions is difficult to apply in practice. Therefore, this article is based on the long-term and massive crystal growth data of the existing CL120-97 single crystal furnace crystal pulling workshop, ignoring the complex crystal growth environment in the furnace, and analyzing the correlation of the crystal pulling parameters the affect of crystal diameter. Mining the data Contains regular information, and further builds a crystal diameter prediction model based on BP neural network. The model prediction results are verified by actual crystal pulling data. The results show that the average relative percentage error is 0.08355% for 6 groups of randomly selected crystal pulling data, which proves that the model is feasible for predicting crystal diameters at the equal diameter stage.","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116174493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abdur Rasool, Qingshan Jiang, Qiang Qu, Chaojie Ji
{"title":"WRS: A Novel Word-embedding Method for Real-time Sentiment with Integrated LSTM-CNN Model","authors":"Abdur Rasool, Qingshan Jiang, Qiang Qu, Chaojie Ji","doi":"10.1109/RCAR52367.2021.9517671","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517671","url":null,"abstract":"Artificial Intelligence (AI) is a research-focused technology in which Natural Language Processing (NLP) is a core technology in AI. Sentiment Analysis (SA) aims to extract and classify the people's opinions by NLP. The Machine Learning (ML) and lexicon dictionaries have limited competency to efficiently analyze massive live media data. Recently, deep learning methods significantly enrich the accuracy of recent sentiment models. However, the existing methods provide the aspect-based extraction that reduces individual word accuracy if a sentence does not follow the aspect information in real-time. Therefore, this paper proposes a novel word embedding method for the real-time sentiment (WRS) for word representation. The WRS's novelty is a novel word embedding method, namely, Word-to-Word Graph (W2WG) embedding that utilizes the Word2Vec approach. The WRS method assembles the different lexicon resources to employ the W2WG embedding method to achieve the word feature vector. Robust neural networks leverage these features by integrating LSTM and CNN to improve sentiment classification performance. LSTM is utilized to store the word sequence information for the effective real-time SA, and CNN is applied to extract the leading text features for sentiment classification. The experiments are conducted on Twitter and IMDB datasets. The results demonstrate our proposed method's effectiveness for real-time sentiment classification.","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122286318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Leijian Yu, Erfu Yang, Beiya Yang, Andrew Loeliger, Zixiang Fei
{"title":"Stereo Vision-based Autonomous Navigation for Oil and Gas Pressure Vessel Inspection Using a Low-cost UAV","authors":"Leijian Yu, Erfu Yang, Beiya Yang, Andrew Loeliger, Zixiang Fei","doi":"10.1109/RCAR52367.2021.9517584","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517584","url":null,"abstract":"It is vital to visually inspect pressure vessels regularly in the oil and gas company to maintain their integrity. Compared with visual inspection conducted by sending engineers and ground vehicles into the pressure vessel, utilising an autonomous Unmanned Aerial Vehicle (UAV) can overcome many limitations including high labour intensity, low efficiency and high risk to human health. This work focuses on enhancing some existing technologies to support low-cost UAV autonomous navigation for visual inspection of oil and gas pressure vessels. The UAV can gain the ability to follow the planned trajectory autonomously to record videos with a stereo camera in the pressure vessel, which is a GPS-denied and low-illumination environment. Particularly, the ORB-SLAM3 is improved by adopting the image contrast enhancement technique to locate the UAV in this challenging scenario. What is more, a vision hybrid Proportional-Proportional-Integral-Derivative (P-PID) position tracking controller is integrated to control the movement of the UAV. The ROS-Gazebo-PX4 simulator is customised deeply to validate the developed stereo vision-based autonomous navigation approach. It is verified that compared with the ORB-SLAM3, the numbers of ORB feature points and effective matching points obtained by the improved ORB-SLAM3 are increased by more than 400% and 600%, respectively. Thereby, the improved ORB-SLAM3 is effective and robust enough for UAV self-localisation, and the developed stereo vision-based autonomous navigation approach can be deployed for pressure vessel visual inspection.","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127043545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jianshu Zhou, Yunquan Li, Yang Yang, Hanwen Cao, Junda Huang, Yunhui Liu
{"title":"A 22-DOFs Bio-inspired Soft Hand Achieving 6 Kinds of In-hand Manipulation","authors":"Jianshu Zhou, Yunquan Li, Yang Yang, Hanwen Cao, Junda Huang, Yunhui Liu","doi":"10.1109/RCAR52367.2021.9517366","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517366","url":null,"abstract":"Bio-inspired soft robots present distinctive superiorities in safety issues working in a human-centered environment. Soft robotic hands are of prominent popularity for soft robots to be applied in real applications. With continuous efforts being devoted, researchers have been developing various soft hands performing excellent grasping capability towards daily objects with salient safety insurance. However, the functional dexterity of soft robotic hands is still limited, especially because lacking in-hand object manipulation capabilities, which inevitably limits the application potential of soft robotic hands. This restriction is induced by the limited dexterity of soft actuators usually with a one-DOF per actuator providing a predefined motion trajectory. To tackle this challenge, a novel bio-inspired multi-DOF soft actuator based on V-joint is proposed, which achieves human finger-joint-like motion. By connecting the V-joint in a desired order, it is possible to build multi-DOF soft robots like traditional rigid counterparts. A 22-DOFs anthropomorphic soft hand (S-22) is fabricated out based on the V-joint, which is capable of realizing dexterous hand gestures and 6 kinds of in-hand manipulation. The presented soft robotic approach is a promising solution for dexterous soft robotic hand design and broden the potential application of soft hands.","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126766065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jie Li, Chao Han, Tao Yu, Xiao He, Zhenming Jiang, Leijie Sun, Hao Liu
{"title":"Bronchoscopic Interventional Surgery Robot which Constrained by a Shear-Fork Mechanism","authors":"Jie Li, Chao Han, Tao Yu, Xiao He, Zhenming Jiang, Leijie Sun, Hao Liu","doi":"10.1109/RCAR52367.2021.9517429","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517429","url":null,"abstract":"To ease the workload of bronchoscopy doctors, reduce the risk of both patients and doctors, and improve the accuracy and flexibility of bronchoscopy and biopsy, in this paper, a kind of bronchoscope interventional robot which constrained by shear-fork mechanism is designed, and the model simulation test is carried out. Based on the full analysis of the operation essentials and techniques of doctor's mirror feeding and biopsy sampling. The interventional robot includes hardware platforms such as operating handle, shear-fork constraint mirror feeding mechanism, upper computer, and so on, cooperating with master-slave control mode, the flexible transportation of the bronchoscope in straight line and rotation, the transportation of the biopsy forceps in a straight line and the opening and closing of the forceps were realized. The validity of the model is verified by the model experiment on the human trachea simulation model.","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127453597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Joint Torque Feedback-based Decentralized Neuro-optimal Control of Input-constrained Modular Robot Manipulator System","authors":"B. Ma, Yuan-chun Li","doi":"10.1109/RCAR52367.2021.9517614","DOIUrl":"https://doi.org/10.1109/RCAR52367.2021.9517614","url":null,"abstract":"This paper presents a decentralized neuro-optimal control for input-constrained modular robot manipulator (MRM) system based on joint torque feedback (JTF) technique. Utilizing the joint torque sensor measurement, the dynamic model of MRM subsystem is constructed. An improved performance index function is formulated by utilizing the hybrid tracking errors, measured model information, constrained control input torque and uncertainties. On the basis of adaptive dynamic programming (ADP) approach, the corresponding Hamilton-Jacobi-Bellman (HJB) equation is settled via critic neural network (NN) structure, thus, the decentralized optimal control strategy is obtained. The trajectory tracking error of the MRM subsystem is proved to be ultimately uniformly bounded (UUB) under the Lyapunov stability theorem. The effectiveness of the developed control strategy is guaranteed by experimental results.","PeriodicalId":232892,"journal":{"name":"2021 IEEE International Conference on Real-time Computing and Robotics (RCAR)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116658990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}