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Cutting force modeling in high-speed machining of selective laser melted Ti6Al4V alloys based on a modified constitutive model considering thermally activated effect

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Science China(Technological Sciences) 2025年第3期68卷 138-155页

作者： Dejian LIU Chenbing NI Youqiang WANG Lida ZHU Zhongpeng ZHENG Wei LU Naixin ZHANG Xingbao HUANG School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao266520China Key Lab of Industrial Fluid Energy Conservation and Pollution Control Ministry of EducationQingdao266520China School of Mechanical Engineering and Automation Northeastern UniversityShenyang110819China School of Mechanical Engineering Tsinghua UniversityBeijing100084China Shandong Zhongheng Jingxin Carbon Fiber Technology Development Co. LtdDezhou251100China State Key Laboratory of Bridge Safety and Resilience College of Civil EngineeringHunan UniversityChangsha410082China

The thermally activated effect can produce a vital influence on the mechanical property and cutting force of metal materials in the machining *** insight can be gained into the action criteria of the thermally activated effect on the cutting force,which provides a solid basis of the research of material performance and *** this study,a cutting force model of selective laser melted(SLMed)Ti6Al4V alloy is proposed by introducing the modified constitutive model with thermally activated effects and the analytical model of the deformation zone into the cutting force *** anisotropic properties of SLMed Ti6Al4V alloy under different scanning strategies(0°,67.5°,and 90°)are explored by combining with the cutting force model,constitutive model and analytical model of deformation zone(primary deformation and tool-chip contact area).The action of thermally activated effects on the cutting force,primary deformation and tool-chip contact zone is also researched in *** experiments and predictions of SLMed Ti6Al4V alloy under different scanning strategies have been implemented to reveal the effectiveness of this new *** comparison results indicate that the proposed milling force model can effectively predict milling force and reflect well on the anisotropy of SLMed Ti6Al4V *** addition,this proposed force model can well analyze the action mechanism of the thermally activated effect on the milling force of SLMed Ti6Al4V alloy,which is significantly essential for the machining mechanism research in terms of a microscopic perspective.

关键词： cutting force model modified constitutive model thermally activated effect SLMed Ti6Al4V alloy laser scanning strategies anisotropic properties

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Fault diagnosis for wasterwater treatment plant based on an improved support vector data description method

Fault diagnosis for wasterwater treatment plant based on an ...

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2023 CAA Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2023

作者： Zhou, Meng Song, Weiwei Wang, Jing Wang, Chang North China University of Technology School of Electrical and Control Engineering Beijing China Beijing Aerospace Automation Research Institute Beijing China

ISBN: (纸本)9798350337754

In this paper, a fault detection method based on improved support vector data description is proposed for wastewater treatment plants. First, an improved Multi-Kernel Support Vector Data Description (MKSVDD) method is presented in which multicore-kernel functions are combined with the traditional support vector data description method. This can make the model more adaptable to different input samples, allowing it to have both learning and generalization capabilities. Then, the parameters of the MKSVDD are optimizted by Sparrow Search Algorithm (SSA), which overcomes randomness and uncertainty of human manual adjustment parameters. Finally, simulation results are given to demonstrate the effectiveness of the proposed method. Nine types of fault data sets generated by the Benchmark Simulation Model 1 (BSM1) are used and simulations results show that the model is more adaptable to the samples and has better indicators for anomaly detection compared to the original algorithm. © 2023 IEEE.

关键词： Wastewater treatment

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Alertness Analysis from EEG Signals based on Temporal Complex Network Features 16

Alertness Analysis from EEG Signals based on Temporal Comple...

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16th International Congress on Image and Signal Processing, BioMedical engineering and Informatics, CISP-BMEI 2023

作者： Wei, Beibei Han, Chunxiao Chen, Yi Che, Yanqiu Qin, Yingmei Li, Shanshan Tianjin University of Technology and Education Tianjin Key Laboratory of Information Sensing & Intelligent Control School of Automation and Electrical Engineering Tianjin China

ISBN: (纸本)9798350330755

Fatigue driving is a major contributor to traffic accidents, as it reduces alertness and can even be fatal. To investigate alertness changes during prolonged driving, we first built a simulated driving experiment platform and designed an alertness detection experiment. Electroencephalogram (EEG) signals were collected during prolonged fatigue driving from 16 subjects. For each subject, the driving process was divided into eight stages from T0-T7. Then, the alertness level was analyzed by temporal complex network method based on multiplex limited penetrable visibility graphs from the collected EEG signals. The clustering coefficient, path length and global efficiency of the constructed complex network were extracted for each driving stage under five typical brain rhythms including delta, theta, alpha, beta, and gamma. The results indicate that after a long stage of driving, the clustering coefficient and path length show an overall increasing trend, while the global efficiency reveals an overall decreasing trend. Our findings may provide indicators for monitoring alertness level. © 2023 IEEE.

关键词： Complex networks

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control law design for localizer pre-capture based on integrated navigation 2

Control law design for localizer pre-capture based on integr...

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2nd International Symposium on Aerospace engineering and Systems, ISAES 2023

作者： Zhang, Jiahao Meng, Fandong Zhou, Chao Gao, Zhiyuan School of Mechatronic Engineering and Automation Shanghai University Shanghai China Comac Aircraft Electronics Electrical and Control Integration Division Shanghai China

ISBN: (纸本)9798350303728

To enhance the performance of automatic landing systems for commercial aircraft, a control law of localizer pre-capture was developed based on the maximum pitch angle limit of the approach, the characteristics of the aircraft and localizer, and the fusion signals of the integrated navigation are used to delineate the approach paths and adjust the intercept angle. The modeling and simulation of the control law was implemented using MATLAB/Simulink. The simulation results show that the designed control law can guide the aircraft into the linear beam range of the localizer with appropriate intercept angle in various complex situations. The proposed method can provide a reference for further research of automatic flight control system for commercial aircraft. © 2023 IEEE.

关键词： Air navigation

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Features Extraction of Different Emotional based on Brain Rhythm 5

Features Extraction of Different Emotional based on Brain Rh...

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5th Asia Symposium on Image Processing, ASIP 2023

作者： Liu, Yanli Han, Chunxiao Tong, Wenhui Liu, Junxiu Qin, Yingmei Che, Yanqiu Tianjin University of Technology and Education School of Automation and Electrical Engineering Tianjin Key Laboratory of Information Sensing & Intelligent Control Tianjin China

ISBN: (纸本)9798350323429

Emotions are an essential part of human physiological performance. Therefore, the study of emotion recognition is extremely relevant in both practical applications and theoretical research. Based on the electroencephalogram (EEG) data we collected, this paper explored the differences from five different characteristics among the coefficient of variation (CV) , power spectral density (PSD) , differential entropy (DE) , approximate entropy (AE) , and permutation entropy (PE) of three emotions at different rhythms, analyzed the activity of each brain region under different emotions. Finally, this paper also compares the classification accuracy of single features and combined features. The experimental results reveal that emotions are more strongly correlated with Beta and Gamma bands;temporal lobe regions are most active in emotion-related brain activity;and the accuracy of combined features is higher than the accuracy of single feature classification. The experiment conclusively demonstrates that effective feature extraction and selection have far-reaching implications for emotion recognition. © 2023 IEEE.

关键词： Emotion Recognition

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Odor Plume Direction Estimation via Gas Sensor Array

Odor Plume Direction Estimation via Gas Sensor Array

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2023 International Annual Conference on Complex Systems and Intelligent Science, CSIS-IAC 2023

作者： Li, Jin-Sheng Li, Ji-Gong School of Automation and Electrical Engineering Tianjin University of Technology and Education Tianjin Key Laboratory of Information Sensing and Intelligent Control Tianjin China

ISBN: (纸本)9798350309003

The direction of the odor plumes is very helpful for robots to preform odor source localization task. To address issues of that wind measurement equipment is not able or convenient to carry on the robots, this paper proposes a method for estimating the incoming direction of the odor plume with a gas sensor array. Firstly, a model for estimating the incoming direction of the odor plume was established via the positional relationship between gas sensors in the sensor array. Secondly, by using the output responses of the gas sensors in the array, the time delay between gas sensors was calculated via cross-correlation method. Thirdly, the solution of the model was solved using the Levenberg-Marquette method. Finally, the results of gas sensor arrays in different distribution patterns indicate that our proposed method can estimate the incoming direction of odor plume effectively. © 2023 IEEE.

关键词： Gases

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Trajectory Planning of Robot Terminal Pose by Interpolation Method 38

Trajectory Planning of Robot Terminal Pose by Interpolation ...

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38th Youth Academic Annual Conference of Chinese Association of automation, YAC 2023

作者： Chen, Biao Hu, Shan Bing, Zhigang Tianjin University of Technology and Education Tianjin Key Laboratory of Information Sensing Intelligent Control School of Automation and Electrical Engineering Tianjin China

ISBN: (纸本)9798350303636

In order to improve the stability of the robot at work, this paper adds an insertion point between the end of the robot and the next target point, and changes the original linear trajectory to a new trajectory planned by interpolation method. The simulation experiment is carried out in MATLAB software. The interpolation method curve is compared with the linear curve. The optimization results show that the velocity and acceleration curves under the interpolation method become more gentle, which verifies the effectiveness of the method. © 2023 IEEE.

关键词： interpolation method linear posture robot

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Data-Based Soft Fault Diagnosis of a Three-Phase DC/AC Converter 7

Data-Based Soft Fault Diagnosis of a Three-Phase DC/AC Conve...

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7th IEEE International Electrical and Energy Conference, CIEEC 2024

作者： Chen, Cen Du, He Cai, Xi Wang, Haoran Zhai, Guofu Harbin Institute of Technology Department of Electrical Engineering and Automation Harbin China Engineering Corporation China Three Gorges Construction Chengdu China Three Gorges Intelligent Industrial Control Technology Company Wuhan China

ISBN: (纸本)9798350359558

With the widespread use of power electronic equipment, accurately identifying soft faults in power electronic converters is crucial for the stable and reliable operation of power electronic equipment. This paper proposed a soft fault diagnosis method for three-phase DC/AC converter using a data-based approach. Firstly, simulation analysis is conducted on the soft faults of three-phase DCI AC converter, and appropriate test signals are selected as data sources. Then, the LSTM neural network and its variants are used to obtain fault diagnosis models. Finally, the method is validated through experiments, and the results show that it has good performance in soft fault diagnosis of the three-phase DCI AC converter. © 2024 IEEE.

关键词： Failure analysis

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Imbalanced Fault Diagnosis of Key Components in Spacecraft ACS via Collaborative ResNet

Imbalanced Fault Diagnosis of Key Components in Spacecraft A...

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2023 China automation Congress, CAC 2023

作者： Ma, Shujun Mao, Zehui Liang, Hanyu Li, Shuyu College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China Laboratory of Science and Technology on Space Intelligent Control Beijing China

ISBN: (纸本)9798350303759

In this paper, a fault diagnosis method based on Collaborative Residual Network (Collaborative ResNet) is proposed to address the problem of imbalanced fault diagnosis for key components of spacecraft attitude control system (ACS). The designed Collaborative ResNet consists of two branches, the conventional learning branch and rebalancing learning branch, which conduct representation learning and classifier learning, respectively. A new Dynamic Complementary Loss (DC Loss) is introduced in the rebalancing learning to dynamically alleviate the excessive gradient of negative samples on the few sample classes and compensate for the gradient of misdiagnosed samples, which enhances the network sensitivity to the class with few number samples. Then the features extracted by two branches are adaptively integrated through the collaborative learning strategy to combine the strengths of both approaches. The effectiveness of the proposed method was validated on the imbalanced data collected on a ground semi-physical platform. © 2023 IEEE.

关键词： Failure analysis

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Implicit Representation for Interacting Hands Reconstruction from Monocular Color Images 12th

Implicit Representation for Interacting Hands Reconstructio...

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12th International Conference on Image and Graphics, ICIG 2023

作者： Zuo, Binghui Zhao, Zimeng Xie, Wei Wang, Yangang School of Automation Southeast University Nanjing China Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Nanjing China

ISBN: (纸本)9783031463044

Reconstructing interacting hands from monocular color images plays an important role in promoting the understanding of human behavior and the application of existing AR/VR technology. With the emergence of interacting hands datasets, numerous data-driven methods attempt to regress the MANO parameters of the left and right hand from the network. This formulation not only limits the handedness and the number of hands in the image but also introduces the deficiencies of the MANO into the interacting-hand reconstruction task. To address this obstacle, we present a novel framework for representing the surface of interacting hands with implicit functions. Our key idea is to construct an implicit neural occupancy network, which implicitly reconstructs interacting hands with image features as query strategies and conditions. The proposed query strategies only require one sample to obtain enough points on the surface. Our unified framework efficiently completes the task of reconstructing hands with the unlimited number, handedness, and interaction compactness from monocular color images. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.

关键词： Color

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