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5th IEEE International Conference on Flexible and Printable Sensors and Systems, FLEPS 2023

作者： Majidi, Carmel Carnegie Mellon University Department of Mechanical Engineering PittsburghPA United States Robotics Institute Carnegie Mellon University Department of Electrical & Computer Engineering PittsburghPA United States

ISBN: (纸本)9781665457330

Over the past decade, there's been tremendous advancements in soft and highly stretchable circuitry for use in epidermal electronics for health monitoring, wearable computing, and soft robotics. As these technologies continue to improve, there is increasing interest in new material architectures that allow these materials to be printable over large areas or to exhibit robust self-healing properties. Here, I present progress on new classes of highly elastic 'biphasic' composites that incorporate gallium indium (EGaIn) liquid metal and silver flakes within a soft polymer matrix. These include printable inks for creating soft, sticker-like, digital circuits and bioelectronic interface using styrene-isoprene-styrene (SIS) thermoplastic elastomer as the polymer binder. I also present recent progress on EGaIn-Ag-organogel composites that exhibit unique combinations of dynamically tunable electrical conductivity and spontaneous mechanical self-healing. These composites can be utilized for applications that range from highly stretchable digital circuits to bioelectronic stickers for electrophysiological monitoring. © 2023 IEEE.

关键词： Timing circuits

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A framework for correcting measurement position and directions to improve experimental frequency-based substructuring and hybrid models 31

A framework for correcting measurement position and directio...

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31st International Conference on Noise and Vibration engineering, ISMA 2024 and 10th International Conference on Uncertainty in Structural Dynamics, USD 2024

作者： Brons, M. Trainotti, F. Technical University of Denmark Department of Civil and Mechanical Engineering Nils Koppels Allé Kgs. Lyngby2800 Denmark Technical University of Munich Department of Mechanical Engineering Munich Institute for Robotics and Machine Intelligence Boltzmannstraße 15 Garching bei München85748 Germany

ISBN: (纸本)9789082893175

Experimental Frequency-based substructuring (FBS) is a strong tool for coupling individual substructures in the frequency domain to obtain predictions of the coupled response. A high-fidelity hybrid model can be obtained using FBS experimental measurements combined with an underlying numerical model. However, if the experimental sensor and impact positions are not exactly as numerically defined, the hybrid model will propagate errors. In this work, we suggest a method for correcting the position and direction of an impact/sensor to obtain more robust hybrid models. The framework is initially implemented on numerical data to investigate how direction or position can be detected. It is also tested on experimental data of a beam to validate the framework's applicability in practice. © 2024 Proceedings of ISMA 2024 - International Conference on Noise and Vibration engineering and USD 2024 - International Conference on Uncertainty in Structural Dynamics. All rights reserved.

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Interior-stress fields produced by a general axisymmetric punch

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Friction 2022年第4期10卷 530-544页

作者： Longxiang YANG Zhanjiang WANG Weiji LIU Guocheng ZHANG Bei PENG School of Automotive Engineering Geely University of ChinaChengdu 641423China Department of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Center for Robotics University of Electronic Science and Technology of ChinaChengdu 611731China

This work is a supplement to the work of Sneddon on axisymmetric Boussinesq problem in 1965 in which the distributions of interior-stress fields are derived here for a punch with general profile.A novel set of mathematical procedures is introduced to process the basic elastic solutions(obtained by the method of Hankel transform,which was pioneered by Sneddon)and the solution of the dual integral *** processes then enable us to not only derive the general relationship of indentation depth D and total load P that acts on the punch but also explicitly obtain the general analytical expressions of the stress fields beneath the surface of an isotropic elastic *** usually known cases of punch profiles are reconsidered according to the general formulas derived in this study,and the deduced results are verified by comparing them with the classical ***,these general formulas are also applied to evaluate the von Mises stresses for several new punch profiles.

关键词： axisymmetric Boussinesq problem interior stress Hankel transform dual integral equations

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Optimized Design of a Haptic Unit for Vibrotactile Amplitude Modulation

Optimized Design of a Haptic Unit for Vibrotactile Amplitude...

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2024 IEEE International Conference on robotics and Biomimetics, ROBIO 2024

作者： Huang, Jingchen Fang, Yun Guo, Weichao Qiao, Zhijian Sheng, Xinjun School of Mechanical Engineering Meta Robotics Institute Shanghai Jiao Tong University State Key Laboratory of Mechanical System and Vibration Shanghai200240 China Hong Kong University of Science and Technology Department of Electronic and Computer Engineering Hong Kong Hong Kong

ISBN: (纸本)9781665481090

Communicating information to users is a crucial aspect of human-machine interaction. Vibrotactile feedback encodes information into spatiotemporal vibrations, enabling users to perceive tactile sensations. It offers advantages such as lightweight, wearability, and high stability, with broad applications in sensory substitution, virtual reality, education, and healthcare. However, existing haptic unit designs lack amplitude modulation capabilities, which limits their applications. This paper proposed an optimized design of the haptic unit from the perspective of vibration amplitude modulation. A modified elastic model was developed to describe the propagation and attenuation mechanisms of vibration in the skin. Based on the model, two types of hierarchical architectural design were proposed. The design incorporated various materials arranged in multiple layers to amplify or attenuate the vibration amplitude as it traveled through the structure. An experimental platform was built to evaluate the performance of the optimized design. © 2024 IEEE.

关键词： Virtual reality

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Graph Synthesis of Generalized Parallel Mechanisms with Coupling Sub-chains 16th

Graph Synthesis of Generalized Parallel Mechanisms with Coup...

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16th International Conference on Intelligent robotics and Applications, ICIRA 2023

作者： Tian, Chunxu Li, Luquan Xia, Zhihao Zhang, Dan Institute of AI and Robotics Academy for Engineering and Technology Fudan University Shanghai200433 China Department of Mechanical Engineering The Hong Kong Polytechnic University Kowloon Hong Kong

ISBN: (纸本)9789819965038

Over the past few decades, there has been extensive research conducted in both academia and industry on conventional parallel manipulators. However, the exploration of generalized parallel mechanisms with coupling sub-chains has received limited attention. This paper introduces a novel approach to synthesizing parallel mechanisms with additional connecting sub-chains, focusing on number synthesis and graph representation. To develop manipulators with additional constraints, this study constructs contracted graphs with different loops. The contracted graphs are represented by arrays, which denote the connectivity relationships among associated linkages, leading to the discovery of new contracted graphs. Besides, the connective array is introduced to identify isomorphic and invalid contracted graphs, while also analyzing specific contracted graph variations. Furthermore, this paper deduces the evolutionary process of contracted graphs, resulting in the derivation of all available topological arrangements. This innovative method for graph synthesis of parallel mechanisms with coupling sub-chains has the potential to expand the range of available options within the family of generalized parallel mechanisms. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Manipulators

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Limitations in Transitioning from Conventional to Modern Total Knee Arthroplasty: A Review

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Multiscale Science and engineering 2024年第3期5卷 77-85页

作者： Sohail, Muhammad Park, Jaehyun Lee, Jaehun Kim, Heung Soo Department of Mechanical Robotics and Energy Engineering Dongguk University-Seoul Seoul Republic of Korea

Total knee arthroplasty (TKA) has undergone significant evolution from the initial concept of ivory components to the integration of artificial intelligence. Modern technologies, such as computers and surgical robots, are now employed to precisely place implants and achieve a neutral joint configuration with minimal incisions. Despite these advancements, achieving the desired preoperative outcome remains a challenge. Accurate implant alignment continues to be a prominent limitation in the field. Malalignment results in unbalanced stresses, restricted range of motion, patient discomfort, and ultimately, TKA failure. This study reviews the limitations of commercially available TKA techniques, including navigated TKA, robotic-assisted TKA, and artificial intelligence-based approaches. Compared with the conventional TKA, navigated TKA offers the advantage of smaller incisions, but does not consistently achieve the planned implant position. Conversely, robotic-assisted surgery theoretically provides perfect neutral alignment, but its widespread use is hindered by high operational costs and associated complications. While machine learning can predict the outcomes, its current level of accuracy is not yet clinically acceptable. Although most of the calculations for Patient-specific implants are performed during preoperative session, reducing surgery duration, drawbacks include the added expense of CT scans and MRI images, while the promised results have yet to be consistently achieved.

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Electrocatalysis for sustainable nitrogen management: materials innovation for sensing, removal and upcycling technologies

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Science China Chemistry 2025年第6期 2322-2342页

作者： Mei Yi Hongmei Li Minghao Xie Panpan Li Zhaoyu Jin Guihua Yu Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China College of Materials Science and Engineering and College of Chemistry Sichuan University Materials Science and Engineering Program and Walker Department of Mechanical Engineering The University of Texas at Austin

The global nitrogen cycle holds immense importance due to its crucial role in supporting life, supplying vital nutrients for plant growth, preserving environmental balance, and enabling the proper functioning of ecosystems. However, human activities frequently disrupt this cycle, leading to the accumulation of nitrates and nitrites in water bodies. This accumulation causes environmental pollution and health risks. Traditional methods for treating nitrogen pollution, including biological, physical, and chemical approaches, have inherent limitations. In recent years, electrocatalysis has emerged as a promising and sustainable approach for nitrogen management. This technology offers superior efficiency, high selectivity, and environmental *** not only enables accurate detection of nitrogen pollutants in the environment but also facilitates their conversion into harmless nitrogen gas. Moreover, recent advancements have focused on the upcycling of nitrogen pollutants into valuable compounds,such as ammonia and urea. In this comprehensive review, we showcase the applications of electrocatalysis in sustainable nitrogen management. Specifically, we highlight its use in the sensing, removal, and upcycling of major nitrogen pollutants,including nitrate（NO3-）, nitrite（NO2-）, and nitric oxide（NO）. We discuss the use of catalysts, such as Pd alloys, Cu-based, and Fe-based materials, in electrochemical sensing and catalysis. Additionally, we explore recent advancements in the conversion of nitrogen pollutants into valuable compounds like ammonia and urea. The review also addresses current challenges and future opportunities in the field, including innovations in sensor and catalyst design, as well as large-scale treatment strategies. We anticipate that these perspectives will provide profound insights for effective nitrogen pollution control and sustainable utilization of nitrogen resources.

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An improved memetic algorithm for multi-objective resource-constrained flexible job shop inverse scheduling problem: An application for machining workshop

An improved memetic algorithm for multi-objective resource-c...

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作者： Wei, Shupeng Tang, Hongtao Li, Xixing Lei, Deming Wang, Xi Vincent School of Mechanical and Electronic Engineering Wuhan University of Technology Wuhan China Hubei Provincial Engineering Research Center of Robotics and Intelligent Manufacturing Wuhan China School of Mechanical Engineering Hubei University of Technology Wuhan China School of Automation Wuhan University of Technology Wuhan China Department of Production Engineering KTH Royal Institute of Technology Sweden

Resource-constrained flexible job shop scheduling problems are commonly encountered in some manufacturing industries, and have been widely studied in recent years. However, traditional resource constrained flexible job shop scheduling problem rarely consider the uncertainties in actual manufacturing systems, which may make the original schedule become suboptimal or even unfeasible. Therefore, a resource constrained flexible job shop inverse scheduling problem (RCFJISP) is proposed in this paper, which aims to cope with uncertain events by simultaneously adjusting the machine, worker and process parameters of the original schedule. A multi-objective optimization model is constructed to minimize the makespan, worker cost, machine energy consumption and deviation index. Furthermore, an improved memetic algorithm (IMA) is developed for solving the proposed problem. In IMA, a novel double-layer encoding mechanism is designed to enhance the capacity in exploring new solution's domains. Three initialization strategies utilizing original scheduling information are designed to improve the quality of initial solutions. An adaptive mutation strategy and a local search mechanism are designed to enhance exploration and exploitation ability of the algorithm. And a crowding operator is proposed to reflect the diversity of the population effectively. In computational experiments, 28 extended benchmarks are constructed, and the effectiveness of the proposed strategy and algorithm is verified by comparing IMA with its 4 variants and other 4 widely used algorithms. Finally, two inverse scheduling problems of a real-world hydraulic cylinder machining workshop under two uncertain situations are studied. The results demonstrate that IMA can effectively solve the actual inverse scheduling problem. With a slight adjustment to the original scheduling, it can reduce the makespan by 11.5%, the worker cost by 8.1% and the machine energy consumption by 27.9% on average. © 2024 The Society of Ma

关键词： Multiobjective optimization

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Combustion Profile of Bio-pellet Produced from Sawdust Using Wet Torrefaction Method with Various Concentrations of Acetic Acid 4

Combustion Profile of Bio-pellet Produced from Sawdust Using...

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4th International Symposium on Advances and Innovation in mechanical engineering, ISAIME 2023

作者： Pertiwi, Indah Ayu Muhammad Abubakar Setiawan, Adi Iskandar, Rizky Magister Program in Renewable Energy Engineering Faculty of Engineering Universitas Malikusssaleh Jalan Batam Bukit Indah Lhokseumawe24352 Indonesia Chemical Engineering Department Faculty of Engineering Universitas Malikussaleh Kampus Bukit Indah Muara Satu Lhokseumawe24352 Indonesia Mechanical Engineering Vocational Education Study Program Faculty of Teaching and Educational Science Universitas Malikussaleh Cot Teungku Nie Reuleut Muara Batu Aceh Utara24355 Indonesia Mechanical Engineering Department Faculty of Engineering Universitas Malikusssaleh Jalan Batam Bukit Indah Lhokseumawe24352 Indonesia

Sawdust is one of the industrial wastes which naturally contains low energy density. An effective method is needed to utilize this biomass as a solid fuel product. This work aimed to investigate the physical and combustion properties of bio-pellets produced from sawdust under the wet torrefaction method. To prepare sawdust bio-pellet a number of steps were carried out including the wet torrefaction process, dough preparation, pelletizing, and drying. Wet torrefaction was performed by hydrothermally treating the sample in an autoclave at a temperature of 130°C and pressure of 2 atm (g) for 80 minutes. For the hydrothermal process, the used acetic acid solution was varied with variations of 1.3 M, 1.8 M, and 2.3 M. Properties of the product were analyzed under proximate and bomb calorimetry analyses. To evaluate the combustion properties a purposely built test apparatus was developed equipped with a data logger system. Based on the results it can be observed that increases in torrefaction temperature and acetic acid concentration resulted in an increase in the calorific value as well as decreases in the ash content. The highest calorific value was 4745 kcal/kg obtained from sawdust torrefied in acetic acid with a concentration of 2.3 M at a temperature of 130?. This sample also exhibits the lowest ash content which is only 1.97%. The combustion test disclosed a maximum combustion temperature of 589? with a burning rate of 0.711 g/min. Overall, the wet torrefaction applied in this investigation was beneficially enhanced the properties of bio-pellet products. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Sawdust

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Controllability Analysis and Stabilization of Untethered Tumbler Floating ROV

Controllability Analysis and Stabilization of Untethered Tum...

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2023 IEEE International Conference on robotics and Biomimetics, ROBIO 2023

作者： Huang, Junda Wu, Haiwen Cao, Hanwen Zhou, Jianshu Liu, Yunhui The Chinese University of Hong Kong T Stone Robotics Institute The Department of Mechanical and Automation Engineering Hong Kong Hong Kong

ISBN: (纸本)9798350325706

Floating ROVs have extensive applications on oceanographic research, environmental monitoring, and search and rescue operations. In this work, two levels of floating ROV stabilization is realized. First, the intrinsic stability is induced by the design of center of mass and moment of inertia based on the stability analysis, such that the ROV can always keep its upwards standing configuration. Besides, an underactuated control method for this novel untethered tumbler floating (TF) ROV is introduced for stabilization, which effectively enhances the stabilization efficiency based on the attitude controller. The model considering rigid body dynamics based on Euler equations, and nonlinear controllability with one, two, or three torques are analyzed serving for the moment of inertia design and underactuated controller. Simulation experiments are conducted to validate the efficacy of our approach, and the results demonstrate its effectiveness for stabilizing the TF-ROV. © 2023 IEEE.

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