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Optimal interface surface determination for multi-axis freeform surface machining with both roughing and finishing

Chinese Journal of Aeronautics 2018年第2期31卷 370-384页

作者： Lufeng CHEN Pengcheng HU Ming LUO Kai TANG Hong Kong University of Science and Technology Hong Kong China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Ministory of EducationNorthwestern Polytechnical University Xi'an 710072 China

In the current practice of multi-axis machining of freeform surfaces, the interface surface between the roughing and finishing process is simply an offset surface of the nominal surface. While there have already been attempts at minimizing the machining time by considering the kinematic capacities of the machine tool and/or the physical constraints such as the cutting force, they all target independently at either the finishing or the roughing process alone and are based on the simple premise of an offset interface surface. Conceivably, since the total machining time should count that of both roughing and finishing process and both of them crucially depend on the interface surface, it is natural to ask if, under the same kinematic capacities and the same physical constraints, there is a nontrivial interface surface whose corresponding total machining time will be the minimum among all the possible（infinite） choices of interface surfaces, and this is the motivation behind the work of this paper. Specifically, with respect to the specific type of iso-planar milling for both roughing and finishing, we present a practical algorithm for determining such an optimal interface surface for an arbitrary freeform surface. While the algorithm is proposed for iso-planar milling, it can be easily adapted to other types of milling strategy such as contour milling. Both computer simulation and physical cutting experiments of the proposed method have convincingly demonstrated its advantages over the traditional simple offset method.

关键词： Feed rate Finishing and roughing process Interface surface lso-planar tool path Physical constraints

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Condition Monitoring for Railway Point Machines Based on Sound Analysis and Support Vector Machine

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Chinese Journal of Electronics 2020年第4期29卷 786-792页

作者： SUN Yongkui CAO Yuan XIE Guo WEN Tao School of Electronic and Information Engineering Beijing Jiaotong University National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi'an University of Technology

Railway point machines(RPMS) are one of the key equipments in the railway system to switch different routes for the *** monitoring for RPMs is a vital measure to keep train operation safe and *** convenience and low cost into consideration, a novel intelligent condition monitoring method for RPMs based on sound analysis is ***-domain and frequency-domain features are obtained,and normalized using z-score standardization method to eliminate the influences of different *** particle swarm optimization(BPSO) is utilized to select the most significant discrimination feature *** effects of the selected optimal features are verified using Support vector machine(SVM), 1-Nearest neighbor(1 NN), Random forest(RF), and Naive Bayes(NB).Experiment results indicate SVM performs best on identification accuracy and computing cost compared with the other three *** identification accuracies on normal switching and reverse switching processes reach100% and 99.67%, respectively, indicating the feasibility of the proposed method.

关键词： Condition monitoring Sound analysis Railway point machines(RPMs) Binary particle swarm optimization(BPSO) Support vector machine(SVM)

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Spatio-temporal distribution of dengue cases and vectors along with the interrelationship of environmental and climatic factors in the metropolitan city, Kolkata, India, for 2017–2022: calling implications for vector control

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Emerging Microbes and Infections 2025年第1期14卷 2493924页

作者： Rani Jena, Sasmita Elanchezhiyan, C. Kumar Sam, Avik Gogoi, Ujjal Shende, Varun Basu, Srimoyee Bandyopadhyay, Saikat Mandal, Bithika Biswas, Baishakhi Banerjee, Atanu Baruah, Kalpana C. Phuleria, Harish Bhowmick, Ipsita Pal Regional Office of Health & Family Welfare MOHFW GOI Kolkata India Department of Zoology Annamalai University Annamalai Nagar India Environmental Science and Engineering Department Indian Institute of Technology Bombay Mumbai Powai India Regional Medical Research Center North East Dibrugarh India Vector Control Department (Health) Kolkata Municipal Corporation Kolkata India Maveric System Dunlap IL United States National Center for Vector Borne Diseases Control Dte.GHS MOHFW GOI Kolkata India

We studied the spatio-temporal distribution of dengue at the micro-scale, along with other important factors for disease transmission, like vector prevalence, seasonality, breeding behaviour, entomological indices, and its relation with environmental and climatic factors in Kolkata, one of the most populous metropolitan cities in India, facing dengue upsurge in recent years. We analysed dengue data from 144 wards, city-level meteorological data for 6 years (2017–2022), Land Use Land Cover (LULC) data for 2022, and entomological surveillance data from 7 wards in 2022. Dengue showed high spatial heterogeneity and clustering at the micro-level, with a yearly post-monsoon peak (August-November) accounting for ∼90% of cases and representing a 2–3 month lag between high rainfall, temperature, and relative humidity (RH). Both Ae. aegypti and Ae. albopictus were prevalent, with distinct spatio-temporal distributions and instances of mixed breeding. Ae. aegypti primarily breeds indoors and peri-domestically, showing a strong correlation with rainfall (R² = 0.78, p-value = 0.0003) in indoor habitats and had a perennial presence. In contrast, Ae. albopictus was the more common outdoor breeder, strongly correlating with rainfall (R² = 0.75, p-value = 0.0003) in outdoor habitats. This is the first study from Kolkata, India, highlighting the spatio-temporal distribution of dengue and its links to vector behaviour, climate, and environmental factors. The findings will help identify recent dengue hotspots in Kolkata, which will help in developing targeted vector control strategies. © 2025 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group, on behalf of Shanghai Shangyixun Cultural Communication Co., Ltd.

关键词： climatic & environmental factors Dengue Kolkata vector

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Enhanced mid-latitude warming due to poleward shift of sea salt aerosols in a warmer future

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Science Bulletin 2025年

作者： Yang, Yang Yu, Yang Wang, Yujue Wang, Hailong Russell, Lynn M. Wang, Pinya Liao, Hong State Key Laboratory of Climate System Prediction and Risk Management/Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control/Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology/Joint International Research Laboratory of Climate and Environment Change Nanjing University of Information Science and Technology Nanjing210044 China School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing210044 China Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Laboratory of Marine Environment and Ecology Ministry of Education of China Ocean University of China Qingdao266100 China Atmospheric Climate and Earth Sciences Division Pacific Northwest National Laboratory RichlandWA99352 United States Scripps Institution of Oceanography University of California San DiegoCA92093 United States

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A New Method for Piston Ring Contour Cutting Based on Linear Driving

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13th International Conference on Advanced Design and Manufacture

作者： Zhang, Yicheng Chen, Zhihua Yang, Liangcai Chen, Jihong Tang, Xiaoqi College of Mechatronic Engineering and Automation National University of Defence Technology China State Engineering Research Centre of Numerical Control System Huazhong University of Science and Technology China Reserch Institute of Numerical Control Kunming University China

ISBN: (纸本)9781848002401

It is not easy to processing piston ring contour because of its complicating shape. From view of time-domain analysis, in order to trace the curve of piston ring, servo actuator must have high speed and acceleration to complete movement of back and forth. From view of frequency -domain analysis, the order of harmonic of the piston ring contour is very high, so the control system bandwidth also should be wide enough. It's hard to satisfy these requirements for the traditional drive methods by using rotate serve and Lead screw. In this paper, a new method of direct drive by linear motor is provided, And achieve good results.

关键词： linear motor piston ring numerical control

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Bayesian reliability estimation method for CNC system based on the prior failure rate

Bayesian reliability estimation method for CNC system based ...

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International Conference on Measuring technology and Mechatronics Automation, ICMTMA 2010

作者： You, Dazhang Xiaoqi, Tang National Numerical Control System Engineering Research Center Huazhong of University Science and Technology Wuhan China Mechanic Engineering College Hubei University of Technology Wuhan China

ISBN: (纸本)9780769539621

The CNC system failure rate distillation function was deduced to adopt Bayes method, which used binomial probability distribution as the likelihood function kernels, and Beta distribution as the prior distribution. With the fully priori information, failure rate mean and variance was calculated, then the parameter in Beta distribution could be estimated . The 2-parameters Weibull distribution was the optimum fitting distribution of the CNC system failure probability distribution .The Shape parameter and size parameter of Weibull distribution could be estimated by using the failure rate gotten from Bayes formula , then the MTBF also could be estimated. © 2010 IEEE.

关键词： Failure rate

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Investigation of the synthesis and thermal insulation properties of K₂Ti₆O₁₃ whisker-reinforced SiO₂ micro powder composite coating fabrics

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Energy 2025年 328卷

作者： Man, Yi Ge, Chang Wang, Yao He, Yongqing Yang, Wei Qi, Yumin Wang, Bohong Varbanov, Petar Sabev Wang, Jin Nanjing Vocational University of Industry Technology Jiangsu Nanjing 210023 China School of Materials Science and Engineering Hebei University of Technology Tianjin 300401 China Hebei Key Laboratory of New Functional Materials School of Material Science and Engineering Hebei University of Technology Tianjin 300401 China School of Energy and Environmental Engineering Hebei University of Technology Tianjin 300401 China Chongqing Key Laboratory of Micro-Nano System and Intelligent Transduction National Research Base of Intelligent Manufacturing Service Chongqing Technology and Business University Chongqing 400067 China National & Local Joint Engineering Research Center of Harbor Oil & Gas Storage and Transportation Technology/Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control Zhejiang Ocean University No.1 Haida South Road Zhoushan 316022 China Széchenyi István University Egyetem tér 1 Győr 9026 Hungary

Developing functional textiles with thermal insulation and hydrophobic properties is of significant interest. This study successfully synthesizes K2Ti6O13 (potassium titanate, KTO) whiskers via the hydrothermal method... 详细信息

Developing functional textiles with thermal insulation and hydrophobic properties is of significant interest. This study successfully synthesizes K₂Ti₆O₁₃ (potassium titanate, KTO) whiskers via the hydrothermal method and prepares KTO composite silica polyester fabric (KSP) through impregnation technology, exhibiting excellent thermal insulation and hydrophobic qualities. X-ray diffraction (XRD) analysis verifies the high purity and excellent crystallinity of KTO whiskers and SiO₂ micro-powder. Scanning electron microscopy (SEM) images reveal that the KTO whiskers retain their original morphology and exhibit uniform size distribution, with an average length of around 1 μm and an aspect ratio of 40. Transmission electron microscopy (TEM) images further validate the planar growth properties of the whiskers. Raman spectroscopy research elucidates the vibrational modes of various chemical bonds in the KTO whiskers. The ultraviolet–visible–near-infrared spectrophotometer test results demonstrate that the KSP fabric reflects 43.5 % more light than standard polyester fabric and substantially lowers the temperature in the covered chamber under simulated sunlight exposure, achieving a maximum reduction of 7.4 °C. The KSP fabric has exceptional hydrophobic properties, completing a contact angle of 153.2° and maintaining reflectance stability, with a mere 5.92 % reduction after 20 days of outside exposure. This work offers substantial reference value for the advancement of practical textiles. © 2025

关键词： Composite coating fabric Hydrophobic property K2Ti6O13 whisker SiO2 micro-powder Thermal insulation

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Implementation and design of open control system for industrial robot based on double-CPU

Implementation and design of open control system for industr...

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International Conference on Computing control and Industrial engineering (CCIE)

作者： Tian, Maosheng Tang, Xiaoqi Zhang, Yong State Engineering Research Center of Numerical Control System Huazhong University of Science and Technology Wuhan China Wuhan Huazhong Numerical Control Co. Ltd Wuhan China

ISBN: (纸本)9781424495979

In order to enhance openness and flexibility of industrial robot control system, an open control system based on double-CPU was designed. An embedded industrial computer based on 86 CPU with Windows XP worked as the upper-system, which implemented HMI and management of the open control system. A FPGA(Field Programmable Gate Array) and another same embedded industrial computer with RT-Linux worked as the lower-system, which implemented realtime motion control of the open control system. Ethernet based on a user-defined Ethernet type was used for exchanging data between the two CPU. Experimental results of the open control system being used for controlling a 5 DOF(Degrees of Freedom) flexible-joint manipulator demonstrate that performance of the system can satisfy requirements of different industrial robot application. © 2011 IEEE.

关键词： Industrial robots

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A modular numerical control system based on embedded technology

A modular numerical control system based on embedded technol...

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2009 International Conference on Computational Intelligence and Software engineering, CiSE 2009

作者： Li, Zhengyi Tang, Xiaoqi Zhou, Xiangdong State Engineering Research Center of Numerical Control System School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781424445073

This paper proposes a novel architecture of the numerical control (NC) system based on multiprocessor and real-time Ethernet. To comply with the trend of modular, open framework NC system, the hardware architecture is composed of ARM, DSP and FPGA modules, of which the ARM module is responsible for HMI (Human-Machine Interface), the DSP module is in charge of core calculation, and the FPGA module plays the role of logical operation and constructs a real-time Ethernet for integrating servo drive modules, machine input/output units into the system. The proposed NC system has the advantages of smart reconfiguration, high performance but low cost. Finally, successful utilization of this system for a hoop bending machine control is briefly described. ©2009 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Study on the High-Speed Penetration and Shear Failure Mechanism of Beach Sand

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Materials 2025年第9期18卷 1922-1922页

作者： Zhu, Jianzhong Li, Jiangquan Kong, Yun Dong, Mingming Li, Yuqiong Zou, Meng Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China Key Laboratory for Bionics Engineering of Education Ministry Jilin University Changchun130022 China School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of Mechanics Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing100190 China Guangdong Aerospace Research Academy Nansha Guangzhou511458 China

In this paper, the contact parameters of beach sand are calibrated based on the discrete element method and the optimal design method, and the obtained parameters by calibration are used as input for the angle of repose simulation. The relative error between angle of repose simulation results and experimental results is 3.27%. Based on the penetration and shear tests, simulation models were constructed to study the pressure shear failure mechanism of beach sand under high-speed conditions. The high-speed penetration simulation shows that with the increase of the penetration rate, the influence area of the sinkage plate gradually increases, and the stress of sand particles also increases. When the penetration rate increased from 0.5 m/s to 8 m/s, the pressure on the plate increased 12.7 times, indicating that the bearing capacity of the sand increased significantly with the increase of the penetration rate. The high-speed shear simulation shows that in the stable shear stage, the average shear torque initially increases slightly with the increase of speed, and then decreases significantly when the speed exceeds 4 m/s. This is because as the shear rate increases, the disturbance of the soil by the shear plate increases, the velocity of soil particles increases, resulting in a decrease in the number of soil particles in contact with the shear plate, thereby reducing the shear torque. © 2025 by the authors.

关键词： Fracture mechanics

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