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A Laser-Scribed Wearable Strain Sensing System Powered by an Integrated Rechargeable Thin-Film Zinc-Air Battery for a Long-Time Continuous Healthcare Monitoring

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SSRN 2022年

作者： Chen, Xue Hou, Zhanrui Li, Guoxian Yu, Wei Xue, Ye Niu, Guangyu Xin, Mingyang Yang, Li Meng, Chuizhou Guo, Shijie State Key Laboratory of Reliability and Intelligence of Electrical Equipment Key Laboratory of Bioelectromagnetics and Neuroengineering of Hebei Province School of Electrical Engineering Hebei University of Technology Tianjin300130 China State Key Laboratory for Reliability and Intelligence of Electrical Equipment Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction School of Mechanical Engineering Hebei University of Technology Tianjin300401 China State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Health Sciences and Biomedical Engineering Hebei University of Technology Tianjin300130 China Department of Architecture and Art Hebei University of Technology Tianjin300130 China

Wearable sensors with long cruising times without the need for an external wire-connected power supply are urgently required for a continuous physiological signal monitoring. Herein, we report the design and fabrication of a wearable all-in-one sensing system that integrates a sensitive strain sensor and a rechargeable zinc-air battery on the same laser-induced graphene (LIG) platform. The sensing electrode of the strain sensor, the catalytic air electrode of the zinc-air battery and the interconnection lines between the two are simultaneously fabricated through the same laser-scribing process on polyimide (PI) followed by pattern transfer to a flexible and stretchable polydimethylsiloxane (PDMS) substrate. In the sensor, the conductive porous LIG exhibits a high gauge factor (~27028.1), a wide detection range (~40%) and a well cyclic loading-unloading stability (>20000 cycles). In the zinc-air battery, Co3O4 nanoparticles are in-situ laser-sintered on LIG to form an excellent electrode/electrolyte/air three-phased interfacing structure for a high catalytic performance, and a moisturized tetraethyl ammonium hydroxide (TEAOH)-KOH/polyvinyl alcohol (PVA) gel electrolyte tightly binds the Co3O4 /LIG air electrode and zinc foil electrode together into an integrate thin-film energy device, which provides a high open-circuit voltage (~1.39 V) and a high specific capacity (712 mAh g-1 at 0.2 mA cm-2 ). For a proof-of-concept, an intelligent wristband based on the sensing system was fabricated and worn on the wearer’s wrist for a long-time continuous pulse monitoring of up to 10 h. The health state of the wearer can be depicted upon the acquired pulse waveforms. The developed LIG-based sensing system with a high internal powering capability will be promising in wearable sensing applications. © 2022, The Authors. All rights reserved.

关键词： Graphene

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Research on temperature field of non-uniform heat source model in surface grinding by cup wheel

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Advances in Manufacturing 2019年第3期7卷 326-342页

作者： Shi-Jie Dai Xiao-Qiang Li Hui-Bo Zhang State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin 300130People's Republic of China School of Mechanical Engineering Hebei University of TechnologyTianjin 300130People's Republic of China Hebei Key Laboratory of Robot Perception and Human-Robot Interaction Tianjin 300130People's Republic of China

To address the problems of thermal damage to a workpiece surface caused by the instantaneous high temperature during grinding and the difficulty in monitoring temperature in real time,the temperature field in the case of composite surface grinding by a cup wheel is *** order to predict the grinding temperature,considering material removal and grinding force distribution,a nonuniform heat source model with different function distributions in the circumferential and radial directions in the cylindrical coordinate system is first proposed;then,the analytical model is deduced and the numerical model of the temperature field is established based on the heat source *** validation experiments for grinding temperature field are carried out using a high-definition infrared thermal imager and an artificial *** to the temperature field based on the uniform heat source model,the results based on the non-uniform heat source model are in better agreement with the actual temperature field,and the temperature prediction error is reduced from approximately 23% to 6%.Thus,the present study provides a more accurate theoretical basis for preventing bums in cup wheel surface grinding.

关键词： Non-uniform heat source Temperature filed Surface grinding Cup wheel

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Grassmann Line Geometry Based Configuration Synthesis of Equivalent Uu Parallel Mechanisms with Two Virtual Center-of-Motion

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SSRN 2022年

作者： Wei, Jun Yu, Bin Liu, Chenglei Song, Jingke Zhang, Jianjun School of Mechanical Engineering Hebei University of Technology Tianjin300401 China Intelligent Rehabilitation Device and Detection Technology Engineering Research Center Ministry of Education Tianjin300130 China Key Laboratory of Robot Perception and Human–Machine Fusion Hebei Province Tianjin300130 China

This paper investigates a class of equivalent UU parallel mechanisms with two virtual center-of-motions (VCMs) in terms of the Grassmann line geometry principle, which its configuration synthesis is carried out by using geometric characteristics of the equivalent UU model. First, the equivalent UU model is proposed concerning the analysis of ankle rehabilitation and the ankle UU model, which three geometric characteristics and four classes of motion and constraint characteristics of the equivalent UU model are given. Second, the motion principle of equivalent UU parallel mechanism is proposed with respects to the characteristics of motion and constraint, which provides a theoretical method for configurable synthesis. Third, a series of constraint limbs satisfying the motion and constraint characteristics of equivalent UU parallel mechanism are synthesized by using the constraint screw synthesis method in terms of the screw theory and Grassmann line geometry principle. Finally, the concept of multiset is introduced into mechanism synthesis, and a series of equivalent UU parallel mechanisms are synthesized based on the method of constraint screw multiset. © 2022, The Authors. All rights reserved.

关键词： Screws

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A Novel Construction Method for 1-Dof Multi-Loop Kirigami Mechanisms

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SSRN 2024年

作者： Lv, Weilin Nie, Wansui Wei, Jun Zhang, Jianjun Meng, Chuizhou Liu, Teng Sui, Jin Guo, Shijie Engineering Research Center The Ministry of Education for Intelligent Rehabilitation Equipment and Detection Technologies Hebei University of Technology Tianjin300401 China Hebei Provincial Key Laboratory of Robot Perception and Human-Machine Fusion Hebei University of Technology Tianjin300401 China School of Mechanical Engineering Hebei University of Technology Tianjin300401 China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang110169 China

Kirigami has been utilized in designing deployable mechanisms for various engineering applications. This paper presents a novel construction method for one-degree-of-freedom (1-DOF) multi-loop kirigami mechanisms whose folding motions are kinematically equivalent to their original degree-4 rigid origami. Firstly, we introduce a family of single-loop kirigami (SLK) as the main loop of 1-DOF multi-loop kirigami. Secondly, the coupling-constraint properties of multi-DOF SLKs are clarified, and the structural characteristics of the 1-DOF multi-loop kirigami are defined, based on which, the construction method for the 1-DOF multi-loop kirigami is proposed. Thirdly, the representative models are selected and their kinematics are presented to demonstrate their capability to achieve folding motion equivalent to their origami prototypes, thus verifying the validity of our proposed methodology. Fourthly, the non-constraint condition of the 1-DOF multi-loop kirigami is presented. Finally, we propose extended configurations of 1-DOF multi-loop kirigami and provide the forward and inverse design methods for constructing kirigami meshes. The proposed methodology facilitates the design of large-scale deployable structures. © 2024, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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On the Study of Configuration and Kinematics of a 3-DOF Generalized Spherical Parallel Mechanism for Ankle Rehabilitation

Research Square

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Research Square 2021年

作者： Zhang, Jianjun Yang, Shuai Liu, Chenglei Wang, Xiaohui Guo, Shijie School of Mechanical Engineering Hebei University of Technology Tianjin300401 China Hebei Province Key Laboratory of Robot Perception and Human-Machine Fusion Tianjin300130 China

The kinematic equivalent model of the existing ankle rehabilitation robot is inconsistent with the anatomy structure of the human ankle, which will influence the rehabilitation effect. Therefore, this paper equivalent the human ankle to the UR model and proposes a novel 3-DOF generalized spherical parallel mechanism for ankle rehabilitation. The parallel mechanism has two spherical centers corresponding to the rotation center of the tibiotalar joint and subtalar joint. Via screw theory, the mobility of the parallel mechanism is analyzed, which meets the requirement of the human ankle. Its inverse kinematics is presented and singularities are identified based on the Jacobian matrix. The workspaces of the parallel mechanism are obtained by the search method and compared with the motion range of the human ankle, which shows that the parallel mechanism could meet the motion demand of ankle rehabilitation. In addition, on the basis of the motion/force transmissibility, the performance atlases are plotted in the parameter optimal design space and the optimum region is obtained according to the demands of practical application. The results show that the parallel mechanism can meet the motion requirements of ankle rehabilitation and have excellent kinematic performance in its rehabilitation range, which provides a theoretical basis for the prototype design and experiment verification. © 2021, CC BY.

关键词： Inverse problems

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An Experimental Study on the Design & Construction of a Torque Measurement Unit with Tactile Sensors

An Experimental Study on the Design & Construction of a Torq...

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Iranian Conference on Electrical engineering (ICEE)

作者： Fatemeh Zargarbashi Hamed Nazemi Harandi Amin Hamed Mehdi Tale Masouleh School of Mechanical Engineering Sharif University of Technology Tehran Iran School of Mechanical Engineering Amirkabir University of Technology Tehran Iran Human and Robot Interaction Laboratory School of Electrical and Computer Engineering University of Tehran Tehran Iran

ISBN: (数字)9781728172965

ISBN: (纸本)9781728172972

This paper presents the state of the art of the design and construction of a torque measurement unit based on a new modification in balancing method. This unit consists of six soft tactile sensors that each include a MEMS barometer covered by silicone rubber. Sensors are mounted in an array under the body of a servo motor to read the force from which motor torque can be obtained. Correct performance of sensor was validated in experimental tests by applying different loads on a Kinco servo motor and comparison of sensor output with value of actual torque obtained from motor driver software. The sensor was able to measure torque with less than 0.1 N.m uncertainty. The main advantage of this torque measurement method is its accuracy, simple construction, precision, real-time measurement and low cost compared to expensive strain gauge based sensors. Due to its soft surface, this torque sensor can be safely employed in human-robot interaction purposes and one can instantly find the force exerted on the environment by the end effector of robot due to the low delay time of the sensors.

关键词： Torque Sensors Torque measurement Force Force measurement Mathematical model Tactile sensors

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Fully Stretchable, Porous Mxene-Graphene Foam Nanocomposites for Energy Harvesting and Self-Powered Sensing

SSRN

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SSRN 2022年

作者： Yang, Li Liu, Chaosai Yuan, Wenjing Meng, Chuizhou Dutta, Ankan Chen, Xue Guo, Langang Niu, Guangyu Cheng, Huanyu State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Health Sciences and Biomedical Engineering Hebei University of Technology Tianjin300130 China Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science & Engineering Hebei University of Technology Tianjin300130 China State Key Laboratory for Reliability and Intelligence of Electrical Equipment Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction School of Mechanical Engineering Hebei University of Technology Tianjin300401 China Department of Engineering Science and Mechanics The Pennsylvania State University University Park 16802 United States State Key Laboratory of Reliability and Intelligence of Electrical Equipment Key Laboratory of Bioelectromagnetics and Neuroengineering of Hebei Province School of Electrical Engineering Hebei University of Technology Tianjin300130 China School of Architecture and Art Hebei University of Technology Tianjin300130 China

The growing demand for intelligent wearable electronic devices has spurred the rapid developments of high-performance deformable power supplies such as triboelectric nanogenerators (TENGs) with high output performance. However, the intrinsically stretchable TENGs especially those prepared with low-cost manufacturing approaches still suffer from poor performance. To address the challenge, this paper presents a fully stretchable TENG consisting of an intrinsically stretchable MXene/silicone elastomer and silver nanowires (Ag NWs)-graphene foam nanocomposite. The intrinsically stretchable TENG exhibits high output performance (voltage, current, and power of 73.6 V, 7.75 μA, and 2.76 W m -2 ), long-term reliability, and stable electrical output under various extreme deformation conditions. In addition to the application on the human skin and clothing for human motion monitoring and detecting the strength training postures, the intrinsically stretchable TENG can also harvest the intermittent mechanical energy from human bodies to charge various energy storage units such as commercial capacitors for driving wearable electronic devices. The resulting systems have been demonstrated in applications from home anti-theft to water resources early warning systems, which provide the proof-of-the-concept demonstrations for the next-generation standalone device platforms. © 2022, The Authors. All rights reserved.

关键词： Nanogenerators

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A Droplet-Based Multivolume Microfluidic Device for Digital Polymerase Chain Reaction

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SSRN 2022年

作者： Wei, Chunyang Yu, Chengzhuang Li, Shanshan Meng, Jiyu Li, Tiejun Cheng, Jingmeng Li, Junwei Hebei Key Laboratory of Robotic Sensing and Human-robot Interactions School of Mechanical Engineering Hebei University of Technology Tianjin300132 China State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin300130 China Institute of Biophysics School of Health Sciences and Biomedical Engineering Hebei University of Technology Tianjin300401 China Department of Computer Science and Electrical Engineering Hebei University of Technology Langfang065000 China

Digital PCR plays an essential role in detecting and quantifying nucleic acid targets, while there are still challenges, including reduction of cost, simplification of operations, and system miniaturization. This work proposes a droplet-based multivolume microfluidic device for easy-to-operate and integrated droplet digital PCR (ddPCR). With an elaborate " asymmetrical droplet-splitting" microstructure, we have successfully prepared a small droplet population ( n = 1.5k, Φ = 59.1 ± 2.2 μm) and a large droplet population ( n = 1.5k, Φ = 106.3 ± 3.9 μm) in the same chip for realizing multivolume design, by which the ddPCR chip achieves a dynamic range of over 10^4 for DNA molecule quantification. The chip integrates droplet generation, droplet array self-assembly, droplet dPCR, and fluorescence detection on a single device. The quantitative capability of the ddPCR chip was evaluated by measuring template DNA at concentrations from 20 to 12500 copies/μL. Benefiting from the characteristics of wide dynamic range, easy operation, and miniaturization, our ddPCR device is expected to be used in the applications involving DNA molecule quantification, including diagnosis of genetic disease, single-cell gene expression, and point of care field. © 2022, The Authors. All rights reserved.

关键词： Drops

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Multi-Component Design of a Mobile Rehabilitation Application for Remote Monitoring of Patients

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Proceedings of the International Symposium on human Factors and Ergonomics in Health Care 2021年第1期10卷 317 - 321页

作者： Shai Bernard Nick Daristotle Yealshaday Demises Jesse Hearn Kohar Malkastian Matt Moorhead Imani Murph Phil Oweida Naghmeh Taefi Monifa Vaughn-Cooke Anne McLaughlin Kimberly Kontson University of Maryland A. James Clark School of Engineering Department of Mechanical Engineering College Park Maryland USA North Carolina State University Department of Psychology Raleigh North Carolina USA The Food and Drug Administration Office of Science and Engineering Laboratories Human-Device Interaction Laboratory White Oak Maryland USA

This paper a will provide background and research outcomes for a student-led multi-University motion capture design project with the FDA human Device interaction Lab. This research project spawned from the FDA’s interest in studying mobile Apps used to collect information about a rehabilitation patient’s function outside of a laboratory setting. This is particularly important from a research perspective as it allows knowledge to be gathered about the reliability, safety, and efficacy of such devices, which can later inform human factors guidelines and regulatory oversight. While there is a wide range of applications for remote monitoring of patient function, this project focuses specifically on wearables used to track rehabilitative progress of individuals suffering from upper or lower limb impairment. These wearables may also be used to assess the efficacy of a new assistive technology intended to restore or augment function. The interdisciplinary student teams applied human-centered design principles to develop and prototype hardware and software components for a rotatable body-worn mobile device holder to remotely track rehabilitation progress. The design process and outcomes are presented along with insights on further development of system components.

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Effect of the configuration and concentration of B-doping on the thermal properties and structural stability of graphene: A theoretical study

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Diamond and Related Materials 2025年 156卷

作者： Li, Dongbo Da, Liangguo Huang, Kaifeng Li, Dong Yu, Liang Wang, Haini Yu, Yaqi Wu, Long Tang, Yunqing School of Mechanical and Electrical Engineering Huainan Normal University Huainan232038 China Human-computer collaborative robot Joint Laboratory of Anhui Province Huainan232038 China School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of Education Shandong University Jinan250061 China

The thermal properties and structural stability of B-doped graphene were investigated by employing density functional theory (DFT), ab initio molecular dynamics (AIMD), and molecular dynamics (MD) simulations, with a focus on the effects of doping configuration and concentration. DFT calculations indicate that B-doping reduces the cohesive energy of graphene, consequently diminishing its structural stability. Among the three B double-doping configurations, only the para configuration exhibits a phonon dispersion without imaginary frequencies, whereas both meta and ortho configurations show imaginary frequencies, indicating structural instability. The AIMD results further demonstrate that B-doped graphene preferentially undergoes cleavage at B[sbnd]B bonds, leading to decreased structural stability. MD results show that B-doping significantly reduces the thermal conductivity of graphene. At a doping concentration is 0.6 %, the thermal conductivity of meta and para configurations decreases to 48.08 % and 54.6 % of that of the pristine graphene, respectively. The results of phonon properties show that B-doping reduces the phonon participation rate and induces strong phonon localization at the B-doped site. These results and conclusions will provide valuable theoretical insights for the thermal design of graphene-based semiconductor devices. © 2025 Elsevier B.V.

关键词： Temperature distribution

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