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2nd International Conference on Modeling in Mechanics and Materials

作者： Jia, Jinda Shan, Xiaobiao Liu, Yingxiang Xie, Tao State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China

Panel flutter vibration is a typical aeroelastic phenomenon taking place in flying aircrafts as they move at high speed. The vibration has been a hot academic research aspect. The present paper focuses on converting this aerodynamic mechanical vibration into useful electricity by using piezoelectric patches. A mathematical Euler-Bernoulli distributed model of the piezoelectric energy harvesting system is established to investigate nonlinear dynamical behaviour of a piezoelectric cantilever plate. The dynamical responding ability of energy harvesting is numerically calculated. Influences of the length and the thickness of piezoelectric layer, the external resistance and wind velocity on the output performance are emphatically explored. A series of prototypes of piezoelectric energy harvesters with different physical dimensions were designed and manufactured. Wind tunnel experiments were setup and carried out at different wind velocities. The experimental results show that the harvesting power gets enhanced as increasing the wind velocity. The maximum power could be obtained at condition of a reasonable piezoelectric length and width. Maximum power is 2.0 mW at wind speed of 11.0 m/s. This work provides a strong theoretical and experimental basis for the study of aerodynamic energy harvesting from panel aircrafts. © Published under licence by IOP Publishing Ltd.

关键词： Energy harvesting

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Edge-Preserving Depth Map Super-Resolution with Intensity Guidance

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Journal of Beijing Institute of technology 2019年第1期28卷 51-56页

作者： Xiaochuan Wang Xiaohui Liang State Key Laboratory of Virtual Reality Technology and System Beihang University

Depth discontinuity edge affects the visual quality of synthesized images in 3D image ***,it suffers from accuracy degradation when up-sampled from low-resolution depth maps,especially at large scaling *** preserve the accuracy of depth discontinuity,a novel joint bilateral depth super-resolution with intensity guidance method is ***,the fast local intensity classification is exploited to estimate depth coefficients in joint bilateral up-sampling for depth maps,so as to eliminate depth discontinuity edge ***,the proposed method is accelerated on graphic processing units(GPUs)to meet the requirement of realtime *** demonstrate that our method can preserve the accuracy of depth discontinuity edges after super resolution,leveraging the visual quality of synthesized image in 3D image warping.

关键词： super resolution depth map joint bilateral filter 3D image warping synthesized image

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Prototype Guided Personalized Federated Intrusion Detection system

Prototype Guided Personalized Federated Intrusion Detection ...

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Smart World Congress (SWC), IEEE

作者： Long Cheng Huiru Yan Hanlin Zhou Ying Wang Haichuan Tang Fang Fang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing China Chinese Academy of Sciences Institute of Computing Technology Beijing China AI Lab of CRRC Academy Beijing China

ISBN: (数字)9798331520861

ISBN: (纸本)9798331520878

Preventing network attacks and protecting user privacy are consistently hot research topics in the Internet of Things (IoT) and edge computing fields. Recent advancements in Federated Learning (FL) have shown promise in addressing these challenges. FL allows various clients to collaboratively build an intrusion detection system (IDS) without sharing their private data. However, most existing methods train a single intrusion detection model for all clients and assume that the training and test data distribution are identical, leading to unsatisfactory detection accuracy and generalization abilities in practice. To overcome these challenges, this paper introduces a prototype-guided personalized FL approach named PG-FedIDS. We propose two novel mechanisms within this method. Firstly, we utilize class prototypes as auxiliary information carriers to generate personalized models for each client, rather than generating a single global model as in previous works. Secondly, we propose a prototype-guided ensemble learning strategy, which can leverage the global knowledge in prototypes to enhance detection accuracy and generalization abilities for each client. We conduct extensive experiments on two benchmark datasets with different evaluation test settings. The results demonstrate that our PG-FedIDS achieves promising detection accuracy and consistently outperforms other FL baselines.

关键词： Training Privacy Accuracy Federated learning Image edge detection Prototypes Intrusion detection Data models Ensemble learning Internet of Things

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Earth Summit Mission 2022:Scientific Expedition and Research on *** Helps Reveal the Synergy between Westerly Winds and Monsoon and the Resulting Climatic and Environmental Effects

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Advances in Atmospheric Sciences 2023年第2期40卷 187-193页

作者： Yaoming MA Weiqiang MA Huaguang DAI Lei ZHANG Fanglin SUN Jinqiang ZHANG Nan YAO Jianan HE Zhixuan BAI Yuejian XUAN Yunshuai ZHANG Yuan YUAN Chenyi YANG Weijun SUN Ping ZHAO Minghu DING Kongju ZHU Jie HU Bian Bazhuga Bai Juepingcuo Zhuo Ma Ren Qingnima Suo Langwangdui Yang Zong Haikun WEN Land-Atmosphere Interaction and its Climatic Effects Group State Key Laboratory of Tibetan Plateau Earth SystemResources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China College of Atmospheric Science Lanzhou UniversityLanzhou 730000China National Observation and Research Station for Qomolongma Special Atmospheric Processes and Environmental Changes Dingri 858200China Kathmandu Center of Research and Education Chinese Academy of SciencesBeijing 100101China China-Pakistan Joint Research Center on Earth Sciences Chinese Academy of SciencesIslamabad 45320Pakistan Meteorological Observatory of Tibetan Autonomous Region Lhasa 850000China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Geography and Environment Shandong Normal UniversityJinan 250014China Meteorological Bureau of Tingri County Tingri 858200China Nanjing Institute of Astronomical Optics&Technology National Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China

“Earth summit mission 2022”is one of the landmark scientific research activities of the Second Tibetan Plateau Scientific Expedition and Research(STEP).This scientific expedition firstly used advanced technology and methods to detect vertical meteorological elements and produce forecasts for mountain ***“Earth summit mission 2022”Qomolangma scientific expedition exceeded an altitude of over 8000 meters for the first time and carried out a comprehensive scientific investigation mission on the summit of *** the participants,the westerly–monsoon synergy and influence team stationed in the *** region had two tasks:1)detecting the vertical structure of the atmosphere for parameters such as wind,temperature,humidity,and pressure with advanced instruments for high-altitude detection at the *** base camp;and 2)observing extreme weather processes to ensure that members of the mountaineering team could successfully reach the *** this scientific expedition,a better understanding of the vertical structure and weather characteristics of the complex area of *** is gained.

关键词： Earth altitude weather

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Reducing the drag of underwater vehicle in the shape of a small boat by using piezoelectric transducers 2

Reducing the drag of underwater vehicle in the shape of a sm...

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2nd International Conference on Modeling in Mechanics and Materials

作者： Zhang, Lu Shan, Xiaobiao Liu, Yingxiang Peng, Gaoliang Xie, Tao State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China

Reducing the flow resistance of moving underwater vehicles can improve their performance and reduce the energy consumption. This paper presents a method to interfere the turbulent boundary layer for achieving the drag reduction by using piezoelectric transducers. The transducer produces ultrasonic traveling waves vibration near the hull surface. The working frequency and the maximum vibration amplitude of the transducers placed in different locations were obtained through the structural dynamic analysis. The fluid-solid coupling simulations were performed to explore the reduction drag performance. The simulation results show that better drag reduction performance can be obtained when the angle between the vibration direction of the piezoelectric transducer and the flow direction is 67.62. The method of using piezoelectric transducer vibration for drag reduction is proved to be feasible. The present work provides a valuable reference for the study of drag reduction of underwater vehicles. © Published under licence by IOP Publishing Ltd.

关键词： Piezoelectricity

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Autonomous inverse encoding guides 4D nanoprinting for highly programmable shape morphing

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International Journal of Extreme Manufacturing 2025年第3期 472-488页

作者： Shuaiqi Ren Zhiang Zhang Ruokun He Jiahao Fan Guangming Wang Hesheng Wang Bing Han Yong-Lai Zhang Zhuo-Chen Ma Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Engineering Research Center of Intelligent Control and Management Department of Engineering University of Cambridge Institute of Medical Robotics School of Biomedical Engineering Shanghai Jiao Tong University State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University

Highly programmable shape morphing of 4D-printed micro/nanostructures is urgently desired for applications in robotics and intelligent systems. However, due to the lack of autonomous holistic strategies throughout the target shape input, optimal material distribution generation,and fabrication program output, 4D nanoprinting that permits arbitrary shape morphing remains a challenging task for manual design. In this study, we report an autonomous inverse encoding strategy to decipher the genetic code for material property distributions that can guide the encoded modeling toward arbitrarily pre-programmed 4D shape morphing. By tuning the laser power of each voxel at the nanoscale, the genetic code can be spatially programmed and controllable shape morphing can be realized through the inverse encoding process. Using this strategy, the 4D-printed structures can be designed and accurately shift to the target morphing of arbitrarily hand-drawn lines under stimulation. Furthermore, as a proof-of-concept, a flexible fiber micromanipulator that can approach the target region through pre-programmed shape morphing is autonomously inversely encoded according to the localized spatial *** strategy may contribute to the modeling and arbitrary shape morphing of micro/nanostructures fabricated via 4D nanoprinting, leading to cutting-edge applications in microfluidics, micro-robotics, minimally invasive robotic surgery, and tissue engineering.

关键词：

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A Networked Method Applied to Sensitivity Analysis of a VSG controlled BESS system

A Networked Method Applied to Sensitivity Analysis of a VSG ...

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Power Engineering (ICPE), International Conference on

作者： Zhiyuan Sun Chao Luo Kun Zheng Yihua Zhu Jiawei Yu Guangxi Power Grid Electric Power Research Institute China Southern Power Grid Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guang zhou China National Energy Power Grid Technology R&D Centre Guang zhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guang zhou China

ISBN: (数字)9798331531140

ISBN: (纸本)9798331531157

The grid-forming battery energy storage system (BESS) plays important role in constructing new energy system. This paper presents a frequency domain modal-based stability analysis of virtual synchronous generator (VSG) controlled BESS. Both ac and dc side interactive dynamics of the grid-tied inverter system are considered, by establishing a hybrid ac/dc impedance network. Then, the frequency domain modal analysis (FMA) method for networked converter systems is applied to the BESS system, covering the eigen-sensitivity from the node level to parameter level. Using this method, key parameters that influence the BESS system’s weakly/negative damping modes most can be better analyzed and identified. The analysis results are validated via the time-domain simulations.

关键词： Battery energy storage system Sensitivity analysis Frequency-domain analysis Modal analysis Stability analysis Synchronous generators Impedance Time-domain analysis Tuning Grid forming

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An improved dynamic window approach integrated global path planning

An improved dynamic window approach integrated global path p...

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2019 IEEE International Conference on robotics and Biomimetics, ROBIO 2019

作者： Zhang, Fuhai Li, Ning Xue, Tiegang Zhu, Ying Yuan, Rupeng Fu, Yili Harbin Institute of Technology State Key Laboratory of Robotics and System Harbin150001 China

ISBN: (纸本)9781728163215

Aiming at the shortcomings of dynamic windowing algorithm (DWA) into local optimal solution. This work studys a modified DWA algorithm integrated global path planning. By introducing the result of global path planning as a reference trajectory, a novel evaluation function is designed which makes the optimal trajectory be guaranteed. In addition, the work also proposes the evaluation sub-function of direction, the evaluation sub-function of smoothing speed and the evaluation sub-function of acceleration, separately, ensures the direction, smoothness and speed of movement. The algorithm is verified in mobile robot, experimental results show that the algorithm optimizes the path of mobile robot, simultaneously, the advantages of the traditional DWA, such as the practicability and continuity of motion are retained. © 2019 IEEE.

关键词： Mobile robots

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Design of a highly compliant underactuated prosthetic hand

Design of a highly compliant underactuated prosthetic hand

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2019 IEEE International Conference on robotics and Biomimetics, ROBIO 2019

作者： Cheng, Ming Fan, Shaowei Jiang, Li Harbin Institute of Technology State Key Laboratory of Robotics and System Harbin Heilongjiang China

ISBN: (纸本)9781728163215

This paper presents a highly compliant prosthetic hand based on a novel synergy mechanism. The prosthetic hand consists of a synergy mechanism, four fingers and one thumb. The synergy mechanism can transmit the power from two motors to four fingers. It can effectively reduce the number of motors. At the same time, it makes the prosthetic hand have excellent dexterity. The underactuated finger has three joints with two DOF. It has two main motion modes: coupled motion in free space and self-adaptive motion when contacting with the object, which can mimic the human finger as much as possible. The thumb uses one motor to drive the two flexion-extension joints and uses a manual switch to drive the abduction-adduction joint, which can reduce the number of motors and the cost efficiently. The performance evaluation is given to demonstrate the comprehensive performance in terms of the versatility, compliance, sensing, size, weight and cost of the proposed design. © 2019 IEEE.

关键词： End effectors

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Assimilation of All-sky Geostationary Satellite Infrared Radiances for Convection-Permitting Initialization and Prediction of Hurricane Joaquin(2015)

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Advances in Atmospheric Sciences 2022年第11期39卷 1859-1872页

作者： Lei ZHU Zhiyong MENG Yonghui WENG Fuqing ZHANG Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environmental Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science and TechnologyNanjing 210044China Laboratory for Climate and Ocean–Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China I.M.System Group(IMSG) at Environmental Modeling Center(EMC)NCEPNWSNOAACollege ParkMD 20740USA Department of Meteorology and Atmospheric Science and Center for Advanced Data Assimilation and Predictability TechniquesThe Pennsylvania State UniversityUniversity ParkPennsylvania 16802USA

Intensity forecasting is one of the most challenging aspects of tropical cyclone(TC) forecasting. This work examines the impact of assimilating high-resolution all-sky infrared radiance observations from geostationary satellite GOES-13 on the convection-permitting initialization and prediction of Hurricane Joaquin(2015) with an ensemble Kalman filter(EnKF)based on the Weather Research and Forecasting(WRF) model. Given that almost all operational global and regional models struggled to capture Hurricane Joaquin(2015)'s intensity, this study examines the potential in improving Joaquin's prediction when assimilating all-sky infrared radiances from GOES-13's water vapor channel. It is demonstrated that, after a few 3-hour cycles assimilating all-sky radiance, the WRF model was able to forecast reasonably well Joaquin's intensity,including its rapid intensification(RI). The improvement was largely due to a more realistic initial hurricane structure with a stronger, warmer, and more compact inner-core. Ensemble forecasts were used to further explore the important physical mechanisms driving the hurricane's RI. Results showed that the RI forecasts were greatly impacted by the initial inner-core vortex structure.

关键词： all-sky infrared radiance TC intensity EnKF inner-core structure

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