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SSRN 2023年

作者： Li, Guirong Zhang, Zhibo Wang, H.M. Cao, Z.L. Liu, J.Q. Zhou, Zicheng Dong, Chao Su, Wenxue Wei, Y.M. Zhao, Huan Zhou, Pengjie School of Materials Science & Engineering Jiangsu University Jiangsu Province Zhenjiang212013 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Hunan Province Changsha410082 China School of Materials Science & Engineering Jiangsu University of Science and Technology Jiangsu Province Zhenjiang212013 China

High-entropy particles reinforced 2024Al composites exhibit the advantages as prominent particulate performance and metal/metal interfacial strengthening, which is the focused topic in the field of advanced composites. In order to adjust the metastable state of solid-solute samples, a variety of aging treatments of FeCoNi1.5CrCu/2024Al composite were processed incorporating oil bath aging (OBA), deep cryogenic and magnetic field treatment (DCT and MFT) in order to adjust the metastable state of solid-solute samples. The results show that in comparison to sole optimized OBA(170℃×10h) both the DCT and MFT accelerate the aging process, that is, the peak aging can be reached at a lower aging temperature(160℃×10h，DCT-OBA) even a shorter aging time(160℃×8h，MFT+OBA). The optimized DCT-OBA and MCT+OBA samples exhibit the similar characteristic as high compactness, high-density dislocations, voluminous nanometer sub-grains, massive GPB areas and plentiful fine precipitates, small-sized and uniformly distributed HEAP andtight-binding interface. The multiple strength and toughness of the composites are attributed to the significant improvement of comprehensive performance. In comparison to the SS one, the least amplification for the three optimized samples are 10.6%(compactness), 57.1%(microhardness),10.0%( yield strength) and 86.1%(maximum compression ratio). © 2023, The Authors. All rights reserved.

关键词： Aluminum

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A power optimization control method based on IMC for 3D printer

A power optimization control method based on IMC for 3D prin...

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2020 International Conference on Mechatronics technology and Intelligent manufacturing, ICMTIM 2020

作者： Xie, Ruidong Yang, Haichuan Yi, Yingmin Key Lab of Manufacturing Equipment of Shaanxi Province Xi'an University of Technology Xi'an710048 China Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi'an University of Technology Xi'an710048 China

Aiming at the effect of selective laser sintering technology used in 3D printing, the recursive least squares method was applied to fitting a control system model for quantification the relationship between laser power and corresponding temperature in this paper. The internal model control method is considered based on the establishing model. The controller is put into the actual 3D printing power control system for controlling the laser power. In the experiment, both internal model controller and the PID controller for the 3D printer are researched and deployed for comparing the their effects in the paper. The experimental result illustrates that the IMC based on the recursive least squares method is of effectiveness. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： 3D printers

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Possible Mechanisms of Cubic Texture Generation in Heavily Rolling Face-Centered Cubic Metal Due to the Annealing Twining

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SSRN 2023年

作者： Ji, Yaotang Suo, Hongli Wang, Lanjin Zhang, Zili School of Materials Science and Engineering Liaocheng University Shandong Liaocheng252059 China Key Laboratory of Advanced Functional Materials Ministry of Education Faculty of Materials and Manufacturing Beijing University of Technology 100 Pingleyuan Chaoyang District Beijing100124 China Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China

Face-centered cubic (FCC) metals were subjected to heavy rolling and two-step recrystallization annealing to form sharp cubic textures. The traditional theory states that the formation of recrystallized cubic-oriented grains originates from rolling cube grains. However, in our study, the Ni8W alloy underwent severe deformation during rolling to form a typical brass-type rolling texture with almost no cubic-oriented grains. The quasi-3D electron backscatter diffraction results show that the newly generated cubic grains are not necessarily adjacent to the rolling cubic grains. Instead of growing from the exited rolling cube grains, we found that the newly oriented recrystallized cubic grains could be generated from twin growth. During the low-temperature recrystallization annealing, most initial recrystallized grains occur based on the grain boundary migration or merging. Under such a condition, the initial recrystallized grains will maintain the same orientation as the original matrix. However, there is another possibility that the initially new orientation recrystallized grains are generated through twinning. The {221} orientation grains that can generate cubic orientation by Σ3 boundaries. Such a twining process reveals another pathway for the generation of initial recrystallized cubic grain in the highly deformed FCC alloys. Then, the recrystallized cubic-oriented grains ultimately evolve into cubic textures owing to their growth advantages, as described by the traditional theory. This discovery solves the puzzle of the recrystallization nucleation mechanism for cubic orientation grains and can help us better understand the evolution of the recrystallized cubic texture in heavily deformed FCC alloys. © 2023, The Authors. All rights reserved.

关键词： Nucleation

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Removal of Phenanthrene from Contaminated Soil by Ozonation Process

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China Petroleum Processing & Petrochemical technology 2020年第3期22卷 73-79页

作者： Yang Yixin Gao Wenfang Yang Jingchao Cao Hongbin Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology College of Chemical EngineeringBeijing Institute of Petrochemical TechnologyBeijing 102617 Beijing Engineering Research Centre of Process Pollution Control and Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190 College of Environmental and Energy Engineering Beijing University of TechnologyBeijing 100124

In order to improve the ozonation efficiency for the remediation of PAHs contaminated soil,the performance experiments were carried out with quartz sand artificially contaminated with *** byproducts of phenanthrene were detected by GC-MS and the toxicity was evaluated by seed germination *** influence of the particle size and moisture content of quartz sand on the ozonation efficiency was *** addition,two kinds of real soil was used to compare with the quartz *** was revealed that the phenanthrene removal rate reached 96%after 600 minutes by using the ozonation *** byproducts of phenanthrene,including 9,10-phenanthrenedione,(1,1’-biphenyl)-2,2’-dicarboxaldehyde,and(1,1’-biphenyl)-2,2’-dicarboxylic acid,were *** proven by seed germination tests,the toxicity of the byproducts was lower than *** phenanthrene was removed more effectively by ozonation in the quartz sand with finer particle *** ozonation efficiency was significantly improved by increasing the moisture content,which is assumed to be related to the alkalinity of quartz sand.

关键词： ozonation phenanthrene quartz sand soil remediation

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Application of Digital Twin technology in the Teaching of Engineering Drawing Course

Application of Digital Twin Technology in the Teaching of En...

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Information Science and Education (ICISE-IE), International Conference on

作者： Runfeng Zhang Yuxin Tang Zhenzhong Liu Yanfang Sun Jianguo Wu Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin China School of Language and Culture Tianjin University of Technology Tianjin China Tianjin Hanhailanfan Marine Technology Co. Ltd. Tianjin China

As an advanced technology that integrates virtuality and reality, digital twin technology has shown a wide range of application prospects in various fields. This paper aims to explore the potential application of digital twin technology in the teaching of engineering drawing courses, to improve students' theoretical knowledge and practical ability. By combining digital twin technology with traditional engineering drawing teaching, students can carry out practical operations and simulations in a virtual environment to better understand and apply drawing concepts and principles. Besides, taking the assembly drawing of thread connection as an actual teaching case, the specific application of digital twin technology in theoretical and experimental teaching is explained, respectively. The results show that digital twin technology is conducive to improving students' interest in engineering drawing courses and training students' spatial imagination ability, which is of great significance to reforming drawing courses.

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CMAS attack behavior of air plasma sprayed thermal barrier coatings with big pores

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Journal of the European Ceramic Society 2022年第13期42卷 6159-6169页

作者： Shan, Xiao Wu, Di Cai, Huangyue Luo, Lirong Yang, Lixia Jia, Libing Guo, Fangwei Zhao, Xiaofeng Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Aero Engine Corporation of China Shanghai Commercial Aircraft Engine Manufacturing Co. Ltd Shanghai201306 China Engineering Research Center of Nano-Geo Materials of Ministry Education Faculty of Materials Science and Chemistry China University of Geosciences Wuhan430074 China College of Material Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing210016 China Power Generation Siemens Energy Co. Ltd Shanghai200082 China

Previous studies indicated that big globular pores in air plasma sprayed (APS) thermal barrier coatings (TBCs) are more likely to remain after calcium-magnesium-alumino-silicates (CMAS) attack than are small ones. In this research, therefore, the CMAS attack behavior of an APS TBC with more big globular pores was investigated. It was demonstrated that the more-big-globular-pores APS TBC exhibited better resistance to exfoliation and intergranular corrosion, and chemical degradation than normal APS TBCs, while its pores can be easily filled by CMAS. Analysis on pore structures and CMAS infiltration characteristics indicated that the morphologies of the transition regions between the globular and the crack network pores may play an import role in determining the CMAS filling behavior for globular pores in APS TBCs. © 2022 Elsevier Ltd

关键词： Plasma spraying

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Stiffness Model of Bolted Joint of Machine Tool Based on Multi-scale Theory

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Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2020年第2期41卷 159-168页

作者： Yang, Cheng Zhao, Yong-Sheng Liu, Zhi-Feng Cai, Li-Gang Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of Technology Beijing100124 China

Computer numerical controlled (CNC) machine tools are comprised of numerous parts mainly connected by bolts. Accurate modeling of the contact stiffness of bolted joints is therefore a crucial element in predicting the dynamic performance of CNC machine tools. This paper presents a contact stiffness model of a bolted joint based on multi-scale theory. The model uses a series of stacked three-dimensional sine waves to describe the multi-scale roughness of the contact surface, and each frequency level is considered to be a single layer of asperities, which are stacked on top of each other. A relationship between the contact area ratio and frequency level can be deduced. Moreover, the contact stiffness at each frequency level can be represented within the model as a spring in series, therefore, the total stiffness is obtained by summing the contact stiffness at each frequency level. An experimental setup consisting of a box-shaped specimen was used to validate the numerical model of the bolted joint for the case of equal bolt pre-tightening forces and relative errors between the multi-scale natural frequencies and experimental frequencies were found to be less than 5.91%. This suggests the multi-scale model can be used to effectively predict the dynamic characteristics of CNC machine tools. © 2020, Chinese Mechanical Engineering Society. All right reserved.

关键词： Bolted joints

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Influence of Different Filling Materials on Stiffness of a New Buffer Bag

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Transactions of Nanjing University of Aeronautics and Astronautics 2021年第1期38卷 106-116页

作者： HOU Yu ZHANG Ming NIE Hong Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics&AstronauticsNanjing 210016P.R.China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China

A buffer bag mechanism is designed,which can provide axial impact protection under small *** stiffness characteristics of the structure under impact load are *** stiffness of the mechanism and the internal pressure change of the buffer bag are compared and analyzed,when the filling materials are liquid and gas ***,the influence of initial fluid bag pressure,bulk modulus and shell thickness on the stiffness of the mechanism and the change of bag pressure are *** results show that the stiffness of the liquid bag is better than that of the gas bag when the filler is liquid and gas;the liquid bag has obvious pressure rise after the mechanism is subjected to axial force by 300 kN,and the gas bag has almost no pressure rise;the change of bulk modulus,which is1000,1500,2000 and 2500 MPa,has an obvious effect on the liquid bag,and it is positively correlated with the stiffness of the *** change of gas modulus,which is 28 and 44,has little effect on the stiffness of the mechanism;the thickness of the buffer bag,which is 5,10 and 15 mm,also has an obvious effect on the *** stiffness of the liquid bag is greater,and the protection for flexible joint is better in the same condition.

关键词： buffer bag flexible joint axial protection liquid bag gas bag

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Evaluation of Landslide Susceptibility Using Machine Learning Based on Information Value Sampling Method

Evaluation of Landslide Susceptibility Using Machine Learnin...

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Chinese Automation Congress (CAC)

作者： Lang Liu Xin Chen Lingran Zhao Weihua Cao School of Automation China University of Geosciences Wuhan China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan China Ministry of Education Engineering Research Center of Intelligent Technology for Geo-Exploration Wuhan China Exploration Institute of Geological Engineering of Xiangyang Xiangyang China

In landslide susceptibility prediction using machine learning (ML) models, the selection of appropriate negative samples significantly impacts the accuracy of the predictions. Many existing studies tend to randomly choose negative samples from the entire research area or specific attribute areas such as low slopes, leading to inaccuracies and biases that decrease the reliability of susceptibility mapping. To address this issue, this paper proposes an ML model based on the coupled information value (IV) method for susceptibility modeling. In this approach, the attribute values of environmental factors are transformed into information values, representing their contribution to landslides, using the information quantity method. Very low and low prone areas are then identified based on these information values, and random points are selected from these areas as negative samples for training and verifying subsequent machine learning models, which include the Random Forest (RF) model and Support Vector Machine (SVM) *** study focuses on the Three Gorges reservoir area in the Zigui-Badong area as an example. The comparative analysis of models trained using traditional sampling methods reveals that the RF model and SVM model, which were sampled using the information value method, achieve accuracies of 95.33% and 91.13%, respectively. In contrast, models trained using traditional sampling methods achieve accuracies of 90.43% and 88.69%, respectively.

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The Path Planning Algorithm for Uuv Based on the Fusion of Grid Obstacles of Artificial Potential Field

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SSRN 2024年

作者： Sun, Mingxiao Xiao, Xiaotian Luan, Tiantian Zhang, Xiaoshuang Wu, Baoqi Zhen, Liqiang School of Automation Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Heilongjiang Provincial Key Laboratory of Complex Intelligent System and Integration Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Jiangsu Automation Research Institution No. 18 Shenghu Road Haizhou District Jiangsu Province Lianyungang City222000 China

The artificial potential field approach (APFA) has the advantages of short computation time and easy implementation, widely used in path planning. The problems of local oscillation and susceptibility to local minima for APFA are considered in three dimensions (3D) path planning application of unmanned underwater vehicle (UUV), and the artificial potential field grid method (APFG) is proposed. Firstly, the obstacles are rasterized in 3D map. The repulsive points are attached to the surface of the raster to change the repulsive influence range. This method can compensate for the long planning path caused by the idealization of traditional APFA modeling. At the same time, the repulsion function on the grid surface is changed so that the potential field on the grid surface is parallel to the grid surface, which will solve the local oscillation problem in the path planning of UUV. Then, virtual target points are introduced to avoid the UUV falling into local optimization. The simulations show that APFG effectively overcomes the shortcomings of local oscillations and the tendency to fall into local minima for UUV in 3D path planning, and the path planning is smooth and efficient. © 2024, The Authors. All rights reserved.

关键词： Motion planning

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