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ADAPTIVE BOUNDARY CONTROL VIBRATION SUPPRESSION OF FLEXIBLE MANIPULATOR BASED ON IMPROVED RBF NEURAL NETWORK

UPB Scientific Bulletin, Series D: Mechanical Engineering 2024年第2期86卷 3-18页

作者： Zheng, Qingchun Wei, Zhiyong Zhu, Peihao Ma, Wenpeng Deng, Jieyong Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin300384 China China School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China Jiangxi Technical College of Manufacturing Jiangxi Nanchang330095 China

With lighter weight, lower power consumption, and higher flexibility, flexible manipulators have been widely used in industrial fields. However, it is easy to produce elastic deformation, resulting in vibration. In this paper, an improved radial basis function (RBF) neural network (NN) for adaptive boundary control is proposed. The partial differential equation (PDE) model of the flexible manipulator is established, and the asymptotic stability of the system is proved by the first Lyapunov method. Finally, simulation results show that the proposed control method can eliminate the low-amplitude angular fluctuation and the high-amplitude angular velocity fluctuation. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Flexible manipulators

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design and Preparation of Photosensitive Resin for the Defect-Free Sic Fabricated by Vat Photopolymerization

SSRN

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SSRN 2024年

作者： Zhang, Yubei Li, Shan Li, Wei Duan, Wenyan Liu, Bingshan Cui, Congcong Zhang, Ge Wang, Gong Technology and Engineering Centre of Space Utilization Chinese Academy of Sciences Beijing100094 China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China

Vat photopolymerization 3D Printing has been successfully used to produce silicon carbide ceramic with complex shape. However, the large polymerization shrinkage and intense pyrolysis behaviors of the photosensitive resin causes defects inside the ceramics. This paper proposes a photosensitive resin formulation with low shrinkage and high flexibility, which is composed of mono-functional monomers with a cyclic structure and an oligomer with a long aliphatic chain to form a three-dimensional cross-linked network. Meanwhile, this work introduces a non-reactive component to mitigate drastic thermal decomposition behavior. The photosensitive resin system has a low polymerization shrinkage and high reactivity, which is suitable for preparing ceramic slurries with high solid loading. Subsequently, the silicon carbide slurry with high solid content and high curing depth was obtained by mixing the silicon carbide powder and the optimal photosensitive resin. Finally, the defect-free silicon carbide parts were achieved through 3D printing, low-stress debinding and liquid silicon infiltration process. The resin preparation strategies proposed in this article provides value references for the preparation of defect free silicon carbide by UV curing. © 2024, The Authors. All rights reserved.

关键词： Silicon carbide

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Adaptive Robust Control of an Uncertain Robotic Manipulator with Guaranteed Transient and Steady State Performance 8

Adaptive Robust Control of an Uncertain Robotic Manipulator ...

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8th IEEE International Conference on advanced Robotics and Mechatronics, ICARM 2023

作者： Liu, Yifan Yu, Dejie Wang, Zilu Zhang, Zheshuo Yin, Hui Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha410082 China School of Information and Electrical Engineering Zhejiang Uni-versity City College Intelligent Transportation System Research Center Zhejiang Hangzhou310015 China School of Mechanical and Automotive Engineering South China University of Technology Guangdong Guangzhou510641 China

ISBN: (纸本)9798350300178

Guaranteeing human-specified performance in robot control subject to complex uncertainties is challenging. This study takes time-varying (possibly fast), bounded with unknown bounds uncertainties into consideration in controlling an uncertain robotic manipulator system (URMS). We employ an adaptive law to on-line estimate the unknown bounds for uncertainty compensation, and prescribed transient and steady state performance (TSSP) are guaranteed by using a state transformation technique. As a result, a class of adaptive robust control with prescribed TSSP is proposed. Simulation results are provided to validate the effectiveness of the proposed approach. © 2023 IEEE.

关键词： Uncertainty analysis

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Low shrinkage Cf/SiC composites by vat photopolymerization of polycarbosilane containing precursor slurry and PIP process

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Ceramics International 2025年

作者： Jin, Baojie Li, Shan Zheng, Xinqi Hu, Chuanqi Wang, Xuye Chen, Zihuan Duan, Wenyan Liu, Bingshan Cui, Congcong Li, Wei Zhang, Ge Wang, Gong Technology and Engineering Centre of Space Utilization Chinese Academy of Sciences Beijing100094 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China

Carbon fiber reinforced silicon carbide (Cf/SiC) composites were fabricated using vat photopolymerization (VPP) technology and precursor infiltration and pyrolysis (PIP) process. The photosensitive slurry was firstly prepared by blending SiC powder, mixed photosensitive resin and chopped carbon fiber. By introducing ceramic precursor vinyl hydropolycarbosilane (VHPCS) into the photosensitive slurry, the flexural strength of the green bodies was enhanced and the linear shrinkage of the debinding bodies was decreased. When the addition of VHPCS was 20 wt%, the flexural strength of the green bodies reached 37.37 MPa, and the linear shrinkage after debinding was 3.82%. Then the influence of different chopped carbon fiber content on various properties of Cf/SiC composites was investigated. When the carbon fiber content was 15 vol%, the flexural strength and bulk density, and porosity of the Cf/SiC composites measuring 190.20 ± 18.57 MPa, 2.40 ± 0.01 g/cm3, and 1.21 ± 0.08%, respectively. TEM and XRD confirmed the existence of C, 6H-SiC, and 3C-SiC in the matrix, where 6H-SiC exhibited crystalline characteristics and 3C-SiC exhibited amorphous characteristics. This work provides a new strategy for VPP additive manufactured Cf/SiC complex structure. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Bending strength

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Image Reconstruction of Photonics Integrated Interference Imaging system: Stablized CLEAN methods

Image Reconstruction of Photonics Integrated Interference Im...

引用

2021 International Conference of optical Imaging and Measurement, ICOIM 2021

作者： Chen, TianBao Tian, MingSen Zeng, XueFeng Zhang, ZhiYu Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Changchun China

ISBN: (纸本)9780738112121

Photonics Integrated Interference Imaging system (PIIIS) is a recently developed far-filed imaging approach aiming at high imaging performance and compact structure. Several sampling lenslet arrays have been proposed to acquire higher imaging quality. These lens configurations provide low-frequency intensive but high-frequency sparse measurements of complex visibility. However, this kind of sampling will induce Gibbs-ringing artifacts in inverse Fourier images. In this article, entropy prior and smoothness prior are proposed to remove the ringing artifacts, and stabilized CLEAN algorithms based on those priors are used to reconstruct images. A simulation experiment using hierarchical multistage sampling lens array is implemented, and the results show that these algorithms can eliminate the ringing artifacts. © 2021 IEEE.

关键词： Entropy

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Ultrawide-band optically transparent antidiffraction metamaterial absorber with a Thiessen-polygon metal-mesh shielding layer

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Photonics Research 2023年第7期11卷 1354-1363页

作者： NAITAO SONG QIAO SUN SU XU DONGZHI SHAN YANG TANG XIAOXI TIAN NIANXI XU JINGSONG GAO Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China College of Da Heng University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Jilin Provincial Key Laboratory of Advanced Optoelectronic Equipment and Instrument Manufacturing Technology Changchun 130033China

Transparent absorbers, with a functional integration of broadband electromagnetic shielding, microwave camouflage,and optical transparency, have attracted increasing attention in the past decades. Metal mesh, an artificial, optically transparent, conducting material composed of periodic metallic gratings, is the optimal choice for the microwave shielding layer of transparent absorbers because of its excellent compatibility between high transparency and low resistance. However, the micrometer-level periodicity of metallic grating concentrates the diffraction of light, which degrades the imaging quality of cameras and sensors in common. In this study, we report on a generalized Thiessenpolygon-randomization method that prevents the concentration of the diffraction of light in periodic metallic grating and demonstrate an ultrawide-band optically transparent diffraction-immune metamaterial absorber. The absorber is constructed with a multilayer indium-tin-oxide-based metasurface and a Thiessen-polygon-randomized metal-mesh reflector. The lossy metasurface provides multimode absorption, whereas the Thiessen-polygon randomization prevents the concentration of the diffraction of light. The practical sample achieves a 10 dB absorptivity and shielding effectiveness over a range of 8–26.5 GHz, and the optical transparency is also preserved over the entire visible and near-infrared regions. The point spread function and field of view are both improved by using the antidiffraction absorber. Our study paves the way for the application of optically transparent electromagnetic devices, display, and optoelectronic integration in a more practical stage. ? 2023 Chinese Laser Press.

关键词： absorber transparent polygon

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An Ontology-based Knowledge Modeling towards Eco-design for Additive manufacturing 31

An Ontology-based Knowledge Modeling towards Eco-Design for ...

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31st CIRP Conference on Life Cycle Engineering, LCE 2024

作者： Wang, Yanan Peng, Tao Kim, Samyeon Xiong, Yi Tang, Yunlong Tang, Renzhong State Laboratory of Fluid Power Components and Mechatronic Systems School of Mechanical Engineering Zhejiang University Hangzhou310058 China Department of Mechanical Engineering Jeonju University Jeonju-si Jeollabuk-do55069 Korea Republic of School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen518055 China Mechanical and Aerospace Engineering Department Monash University Melbourne3800 Australia Materials Science and Engineering Department Monash University Melbourne3800 Australia Zhejiang Province Key Laboratory of Advanced Manufacturing Technology School of Mechanical Engineering Zhejiang University Hangzhou310058 China

Owing to the unique technological merits of additive manufacturing (AM), design for AM, particularly eco-design for AM, has been gaining attention in improving the sustainable performance of AM-fabricated (AMed) parts. The main challenge in harvesting potential sustainability benefits is how to capture the impact of design on sustainable performance. Though several existing studies adopted quantitative evaluation on AM sustainability and investigated the relationships between design information and sustainability information of AMed part, the sustainability information is still unavailable in the design phase. This hardly guides eco-design for AM in practice. To support the increasing industrial applications of AM, this paper illustrates related knowledge, that is, material-process-structure-ecoProperty (MPSeP) relationships to connect design and sustainability information in eco-design for AM. An ontology-based method is proposed to model the MPSeP relationships of the AMed part in a structured way. An example of an AMed hydraulic valve body was used to demonstrate the MPSeP modeling process. It is discussed that how the constructed model effectively assists AM designers through providing eco-design recommendation, and enables design software tools to perform sustainability analysis towards eco-design for AM. © 2024 The Author(s).

关键词： 3D printing

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Let Compressed Sensing Burst into New Life: The Use of Downsampling in Metalens Integrated Interferometric Imaging system

SSRN

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SSRN 2023年

作者： Ma, Lifeng Chang, Jun Huang, Yi Xie, Bingqing Zhang, Jianping School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China

The interference imaging system based on the photonic integrated planar detection technology has the characteristics of small volume, light weight, low power consumption, easy processing and testing, which can meet the needs of photodetectors. And its resolution is not limited by the aperture size of a single lens, which is an emerging technology. Aiming at the image restoration problem of photon integrated interferometric imaging system, the image restoration technology is studied. Here, a new method is proposed to convert the downsampled data of Segmented Planar Imaging Detector for Electro-optical Reconnaissance (SPIDER) into compressed samples and recover the data by compressed sensing. This will create a more meaningful prospect for the further development of integrated photon detection. © 2023, The Authors. All rights reserved.

关键词： Compressed sensing

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An Adaptive Bionic Sensor: Enhancing Ankle Joint Tracking with High Sensitivity and Superior Cushioning Performance

SSRN

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SSRN 2024年

作者： Jin, Jianqiao Zhang, Chen Zhao, Jianyuan Yu, Minghan Lei, Ming Jin, Chun Yin, Rui Zhao, Weiwei Sauvage Laboratory for Smart Materials The School of Integrated Circuit Harbin Institute of Technology Shenzhen518055 China Shenzhen Key Laboratory of Flexible Printed Electronics Technology Harbin Institute of Technology Shenzhen518055 China State Key Laboratory of Advanced Welding & Joining Harbin Institute of Technology Harbin150001 China Human-Computer Interaction Design Lab School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen518055 China

Flexible sensors are renowned for their rapid responsiveness, high flexibility, and outstanding mechanical properties, making them ideal for applications in wearable devices, sports and health monitoring, and human-machine interfaces. To enhance the sensing performance of these flexible sensors, researchers have drawn inspiration from nature, creating various bionic microstructures. However, these structures often manifest in the macroscopic form of thin films, which do little to improve impact resistance and joint protection. In response, this work achieves a highly sensitive and impact-resistant pressure sensor by integrating bionic principles at both micro and macro levels. Specifically, at the micro level, a muscle-like hydrogel system consisting of MXene nanosheets incorporated into the double network of polyvinyl alcohol and sodium alginate matrix is selected. At the macro level, the bionic prototypes of mimosa leaves and durian spikes with good energy absorption structure, together with octopus’ sucker with good adsorption capacity are selected, and the synergistic construction of the three structures is realized through 3D printing methods. The obtained sensor has an appropriate response range, sensitivity and stability. More importantly, the displacement deformation of the hydrogel can be reduced by 91.22%, while its adhesion strength can be increased by 57.5% compared to the unstructured hydrogel. As a proof-of-concept, the proposed bionic flexible sensor can be used to monitor the motion status of the human ankle joint in real-time, thereby assisting users in making real-time judgments on gait health. © 2024, The Authors. All rights reserved.

关键词： Sodium alginate

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受水车启发的、在饱和盐水中也能实现高效和稳定的太阳能淡化的旋转蒸发器

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Science Bulletin 2023年第15期68卷 1640-1650,M0004页

作者：蒋函锦刘行航王海涛王德文郭亚楠王冬高岗王笑夷胡超权 State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of Ministry of EducationJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsSchool of Materials Science and EngineeringJilin UniversityChangchun 130012China School of Fashion and Textiles The Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China College of Chemical Engineering Northeast Electric Power UniversityJilin 132012China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

太阳能海水淡化是解决全球淡水短缺的最有前景方法之一.然而,传统的蒸发体在高盐度海水中遭遇了盐累积带来的蒸发速率下降甚至失效的瓶颈.受古代水车的启发,本文开发了一种自适应旋转蒸发器,其可以在任意浓度的盐水中实现长期高效的太... 详细信息

太阳能海水淡化是解决全球淡水短缺的最有前景方法之一.然而,传统的蒸发体在高盐度海水中遭遇了盐累积带来的蒸发速率下降甚至失效的瓶颈.受古代水车的启发,本文开发了一种自适应旋转蒸发器,其可以在任意浓度的盐水中实现长期高效的太阳能海水淡化.这种蒸发器是一种双硫化物负载的滚筒式生物质炭.借助了木材天然的水传输通道和分层结构,蒸发器具有杰出的水供应和热定位能力.实验和数值模拟表明,归因于其低密度及独特的亲疏水特性,这个蒸发器能够在盐结晶产生的重心偏移下周期性转动以实现自动盐移除.这使得这个蒸发体甚至可以在饱和盐水(26.47%)中,24 h内保持2.8 kg m^(-2)h^(-1)的高蒸发速率,这是过去一直无法实现的.因此,这项概念验证工作展示了一种不受浓度和运行时间限制的、自旋转诱导脱盐的蒸发器.

关键词： Adaptively rotating evaporator Self-removal of salt Waterwheel-inspired Stable solar desalination

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