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8th Asia Conference on Power and Electrical Engineering, ACPEE 2023

作者： Yang, Pengfei zhang, Yu Su, fuwen Xiong, Binyu Mohammad Yusuf Mohammad Ghias, Amer Hoay Beng, Gooi Wuhan University of Technology School of Automation Wuhan China State Grid Hubei Electric Power Research Institute Wuhan China Nanyang Technological University School of Electrical and Electronic Engineering Singapore Singapore

ISBN: (纸本)9798350345520

To reduce the impact on microgrid stability due to the high penetration of distributed energy sources, a novel method based on the virtual synchronous machine (VSM) is used to enhance the dynamic characteristics. The effective allocation of inverters in parallel and power distribution is a key issue for microgrids when the distributed power sources are connected in parallel. This paper proposes a control strategy based on the theory of VSM, which mimics the rotational inertia and damping characteristics of synchronous generators to achieve smooth microgrid control, and analyses the control model of VSM. A case study of the islanded operation of multi-energy sources based on virtual synchronous control is simulated using the MATLAB/Simulink platform. The simulation results show that the control strategy enables the smooth control of the microgrid and accurate power distribution for multiple inverters. © 2023 IEEE.

关键词： MATLAB

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多层砌体结构的损坏程度与层间位移角限值

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建筑结构学报 2018年第S2期39卷 263-270页

作者：蒋利学王卓琳张富文上海市建筑科学研究院上海200032 上海市工程结构安全重点实验室上海200032

对收集到的国内外烧结黏土砖墙抗震试验研究成果进行分析,总结了剪切破坏时无筋和约束砖墙试件的荷载-层间位移骨架曲线、层间位移角限值、位移延性系数等基本特征。在采用层模型对多层砌体结构进行弹塑性抗震计算时,建议采用理想弹塑... 详细信息

对收集到的国内外烧结黏土砖墙抗震试验研究成果进行分析,总结了剪切破坏时无筋和约束砖墙试件的荷载-层间位移骨架曲线、层间位移角限值、位移延性系数等基本特征。在采用层模型对多层砌体结构进行弹塑性抗震计算时,建议采用理想弹塑性模型对荷载-层间位移骨架曲线进行简化。将单片砖墙的简化模型推广应用于多层砌体结构的层间结构,并根据我国不同年代版本的《建筑抗震设计规范》中构造柱设置的不同要求,建议分为5个抗震措施类别,分别给出了结构完好、基本完好、轻微破坏、中等破坏、严重破坏5个性能点的层间位移角限值的建议值,对后三个性能点还给出了允许位移比(水平位移与屈服位移之比)的建议值。所建议的多层砌体结构层间位移角限值与砖墙宏观破坏程度(斜裂缝宽度)有较好的对应关系,可作为特征性能点的控制指标。

关键词：多层砌体结构理想弹塑性模型性能点层间位移角位移延性系数

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基于测距值修正的温室植保机器人定位方法

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农业机械学报 2023年第8期54卷 347-358页

作者：毕松张国轩李志军胡福文北方工业大学电气与控制工程学院北京100144 北方工业大学机械与材料工程学院北京100144

针对温室植保机器人作业过程中,UWB节点之间频繁出现的非视距通信现象导致UWB系统定位精度低和稳定性差的问题,提出了一种基于UWB测距值修正的融合定位方法。首先,设计了基于测距残差的UWB节点间通信类型识别方法;其次,分析了视距和非... 详细信息

针对温室植保机器人作业过程中,UWB节点之间频繁出现的非视距通信现象导致UWB系统定位精度低和稳定性差的问题,提出了一种基于UWB测距值修正的融合定位方法。首先,设计了基于测距残差的UWB节点间通信类型识别方法;其次,分析了视距和非视距通信下UWB测距误差产生原因并建立了两种通信条件下的测距值修正模型;最后,基于扩展卡尔曼滤波器设计了UWB测距修正值和IMU数据融合方法,实现了温室机器人作业过程中的可靠定位。在温室环境下的实际验证结果表明:非视距通信条件下,经过UWB测距修正的融合定位方法的定位误差为11.95 cm,相较于未进行UWB测距值修正的融合定位方法,定位误差降低83.11%,可为温室植保机器人提供稳定的高精度定位信息。

关键词：温室植保机器人 UWB通信类型判别 UWB测距值修正融合定位

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Numerical and experimental analysis of the cavitation characteristics of orifice plates under high-pressure conditions based on a modified cavitation model

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INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 2023年第1期203卷

作者： Li, Qingye Zong, Chaoyong Liu, fuwen Xue, Tianhang zhang, Ao Song, Xueguan Dalian Univ Technol Sch Mech Engn Dalian 116023 Peoples R China

The flow systems in nuclear power plants and aircraft engine fuel pipelines are often subjected to ex-treme high-pressure conditions, which can induce cavitation and severely affect essential system com-ponents. Orifice plates are the most typical infrastructures representing the flow principle of the aboved flow systems. In this paper, a modified cavitation model combining local flow characteristics, supervised learning, and genetic algorithms is proposed to investigate the cavitation flow characteristics of orifice plates under high-pressure conditions. The modified cavitation model eliminates the influence of the bub-ble diameter and nucleation site volume fraction on mass flow rate and achieves dimensionality reduc-tion at the physical level. The relationship between evaporation/condensation coefficients and mass flow rate is constructed by supervised learning, and the two coefficients are determined using the genetic al-gorithm. The mass flow rates are calculated by the modified cavitation model within a 5% experiment error, proving the accuracy of the modified cavitation model. The effect of the diameter ratio (the di-ameter of the pipe to the orifice plate) and pressure drop on the mass flow rate are obtained based on the validated cavitation model. Finally, an empirical formula for calculating the mass flow rate based on the diameter ratio and pressure drop is derived. The modified cavitation model shows great potential for cavitation prediction applications for throttling devices such as nuclear power safety valves and aircraft engine nozzles.(c) 2022 Elsevier Ltd. All rights reserved.

关键词： Computational fluid dynamics Cavitating flowrate modelling Modified cavitation model Mass transfer Throttling device Orifice plate

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IGCRRN: Improved Graph Convolution Res-Recurrent Network for spatio-temporal dependence capturing and traffic flow prediction

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ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE 2022年第0期114卷

作者： zhang, Qingyong Yin, Conghui Chen, Yuepeng Su, fuwen Wuhan Univ Technol Sch Automat Wuhan 430070 Peoples R China Wuhan Univ Technol Sch Informat Engn Wuhan 430070 Peoples R China

Accurate traffic flow prediction is critical for traffic management and route guidance, enabling urban traffic to be free-flowing conditions and maximizing transport efficiency. In current prediction methods, the simple and fixed spatial graph only uses the prior knowledge of the traffic network, resulting in weak prediction performance. This paper proposes an Improved Graph Convolution Res-Recurrent Network (IGCRRN), which relies on uncertain spatio-temporal information for traffic flow prediction. In particular, a spatial dependence matrix that combines the origin graph matrix and the data-generated embedding node matrix is created. In this way, the spatial connection relationship can be obtained from the static graph information and changing traffic flow series, making the improved graph convolution block infer and quantify the different contributions in both spatial dependence and temporal dependence in a data-driven manner. In addition, the residual structure is employed to model the multi-level spatial dependence, and the IGCRRN-cell units based on the residual connection block and LSTM are designed to make the model automatically capture the spatio-temporal dependence in the traffic flow sequence. Experiments are conducted on two real traffic datasets, and the experiment results show that our proposed spatial dependence matrix can investigate the valuable information and consider the heterogeneity in the traffic flow. The IGCRRN model outperforms the baseline and state-of-the-art methods in prediction performance.

关键词： Gated mechanism Graph convolution network Spatio-temporal dependence Heterogeneity Traffic flow prediction

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Potential Gradient Measurement System in Ground Grid Field Area 4

Potential Gradient Measurement System in Ground Grid Field A...

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4th IEEE International Conference on Power, Intelligent Computing and Systems, ICPICS 2022

作者： Yang, Sen Su, Hainan zhang, Yan Yang, Yang Li, fuwen Wang, Daochen State Grid Dandong Electric Power Supply Company Liaoning Province Dandong China

ISBN: (数字)9781665467735

ISBN: (纸本)9781665467735

Substation grounding network is an important measure to maintain the safe and reliable operation of power system and ensure the safety of operators. The condition of grounding device is directly related to the safe operation of power system. It is very important to test the characteristic parameters of grounding device scientifically and reasonably and evaluate its condition accurately. At present, the testing work of grounding device in domestic power system is weak, some key technical concepts are vague, the means are backward, and the testing instrument is not complete. © 2022 IEEE.

关键词： Instrument testing

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Model Composition for Multimodal Large Language Models 62

Model Composition for Multimodal Large Language Models

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62nd Annual Meeting of the Association-for-Computational-Linguistics (ACL) / Student Research Workshop (SRW)

作者： Chen, Chi Du, Yiyang Fang, Zheng Wang, Ziyue Luo, fuwen Li, Peng Yan, Ming zhang, Ji Huang, Fei Sun, Maosong Liu, Yang Tsinghua Univ Inst AI Dept Comp Sci & Tech Beijing Peoples R China Tsinghua Univ Inst AI Ind Res AIR Beijing Peoples R China Alibaba Grp Inst Intelligent Comp Hangzhou Peoples R China Shanghai Artificial Intelligence Lab Shanghai Peoples R China Jiangsu Collaborat Innovat Ctr Language Competenc Nanjing Jiangsu Peoples R China

ISBN: (纸本)9798891760943

Recent developments in Multimodal Large Language Models (MLLMs) have shown rapid progress, moving towards the goal of creating versatile MLLMs that understand inputs from various modalities. However, existing methods typically rely on joint training with paired multimodal instruction data, which is resource-intensive and challenging to extend to new modalities. In this paper, we propose a new paradigm through the model composition of existing MLLMs to create a new model that retains the modal understanding capabilities of each original model. Our basic implementation, NaiveMC, demonstrates the effectiveness of this paradigm by reusing modality encoders and merging LLM parameters. Furthermore, we introduce DAMC to address parameter interference and mismatch issues during the merging process, thereby enhancing the model performance. To facilitate research in this area, we propose MCUB, a benchmark for assessing ability of MLLMs to understand inputs from diverse modalities. Experiments on this benchmark and four other multimodal understanding tasks show significant improvements over baselines, proving that model composition can create a versatile model capable of processing inputs from multiple modalities.

关键词： Computational linguistics

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预制混凝土双T板加固方法试验研究

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施工技术 2019年第15期48卷 6-11页

作者：张永群李向民张富文上海市建筑科学研究院上海200032 上海市工程结构安全重点实验室上海200032

为研究预制混凝土双T板加固方法,分别对通过粘贴CFRP布及钢板加固的预制混凝土双T板进行力学性能试验研究。研究结果表明,未加固预制混凝土双T板对比试件均产生剪压斜裂缝;粘贴CFRP布加固试件的主要破坏模式为钢筋屈服,受拉区CFRP布断... 详细信息

为研究预制混凝土双T板加固方法,分别对通过粘贴CFRP布及钢板加固的预制混凝土双T板进行力学性能试验研究。研究结果表明,未加固预制混凝土双T板对比试件均产生剪压斜裂缝;粘贴CFRP布加固试件的主要破坏模式为钢筋屈服,受拉区CFRP布断裂或剥离;粘贴钢板加固试件的主要破坏模式为受压区混凝土压碎及受拉区加固钢板屈服。加固后预制混凝土双T板试件跨中截面混凝土应变发展规律基本符合平截面假定。粘贴CFRP布加固试件峰值承载力提高约1. 48~1. 83倍,粘贴钢板加固试件峰值承载力提高约2. 17倍。

关键词：钢板混凝土预制加固力学性能

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Three-axial cutting force measurement in micro/nano-cutting by utilizing a fast tool servo with a smart tool holder

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CIRP ANNALS-MANUFACTURING TECHNOLOGY 2021年第1期70卷 33-36页

作者： Chen, Yuan-Liu Chen, fuwen Li, Zhongwei zhang, Yang Ju, Bingfeng Lin, Huanbin Zhejiang Univ State Key Lab Fluid Power & Mechatron Syst Hangzhou 310027 Peoples R China Tech Univ Denmark Dept Mech Engn Lyngby Denmark

Cutting force is a significant indicator for in-process monitoring of cutting status. Although dynamometers are widely used in cutting force measurement, they are not suitable for nano-cutting due to insufficient sensitivities and low integrating possibilities. This paper presents a smart tool holder composed by piezoelectric ceramics and a flexible hinge, which could be integrated with a fast tool servo (FTS), for three-axial cutting force measurements in micro/nano-cutting. An algorithm was developed for enabling its quasi-static force measurement. Experiments were performed to verify the capabilities of cutting force measurement, demonstrating a high measurement sensitivity for indicating the micro/nano-cutting status. (c) 2021 CIRP. Published by Elsevier Ltd. All rights reserved.

关键词： Cutting Force In-process measurement

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Surface Functionalization of Micrometer Silver Flakes for Fabricating High-Performance Electrically Conductive Adhesives

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ACS APPLIED ELECTRONIC MATERIALS 2022年第11期4卷 5387-5396页

作者： zhang, Weiwei Liu, Jiahao Liu, Hao Wang, Jianqiang zhang, Luobin Wang, Jintao Wang, Haozhong Wang, Fengyi Wang, Xinjie Yu, fuwen Lv, Ziwen zhang, Zheng Hang, Chunjin Li, Mingyu Chen, Hongtao Harbin Inst Technol Shenzhen Dept Mat Sci & Engn Shenzhen 518055 Peoples R China Harbin Inst Technol Shenzhen Sauvage Lab Smart Mat Shenzhen 518055 Peoples R China China Elect Prod Reliabil & Environm Testing Res Guangzhou 510610 Peoples R China Beijing Santel Technol & Trading Corp Beijing 100039 Peoples R China Harbin Inst Technol State Key Lab Adv Welding & Joining Harbin 150001 Peoples R China

Silver (Ag) flakes are widely used as conductive fillers in the electrically conductive adhesives (ECAs). However, there are organic lubricants on the Ag surface such as oleic acid and stearic acid, a kind of surfactant commonly used in the production of Ag flakes, which will deteriorate the conductivity and mechanical properties of the ECAs. In this study, glutaric acid was used to remove the organic lubricants, which can increase the electrical conductivity and mechanical properties of the ECAs. FTIR, Raman, and XPS tests revealed that the glutaric acid was chemically adsorbed on the Ag surface by single-dentate coordination and then reacted with organic lubricants, explaining the action mechanism by which the glutaric acid enhanced the electrical and mechanical properties of the ECAs. In addition, the effects of glutaric acid on the thermal stability, bulk resistivity, shear strength, and viscosity of the ECAs were investigated. When the glutaric acid reached 0.12 wt %, the minimum bulk resistivity of the ECAs was 1.52 x 10-4 S center dot cm, the shear strength was 24.57 MPa, and the viscosity was 149 Pa center dot s. This provides a method for fabricating high-performance ECAs.

关键词： glutaric acid flaky Ag powders bulk resistivity shear strength electrically conductive adhesives

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