检索结果-内蒙古大学图书馆

Fabrication of Micro/Nanostructured Copper Fibers by Vibration Cutting for Felt-Based Freshwater Purification

纳米制造与计量（英文） 2024年第4期7卷 1-14页

作者： Kaiyue Wu Jianfu Zhang Zhongpeng Zheng Zhiwei Li Peiyuan Ding Jiahui Liu Jianjian Wang State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipments and Control Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Freshwater purification from wasted water and seawater is crucial in addressing the global problem of water *** fiber felt with a micro/nanostructure emerges as an efficient approach for water purification;however,its production usually relies on chemical postprocessing to create micro/nano structures on the fiber surface,which might pollute the *** study proposed an ecofriendly method to produce micro/nanostructured copper fiber felt without chemical ***,a new transverse-feeding vibration cutting is proposed to fabricate micro/nanostructured fibers with controllable struc-ture *** the sintering of the structured fibers without postprocessing,the fiber felt can be produced in an ecofriendly way and exhibit special wettability and excellent photothermal ***-based freshwater purification,including oil-water separation and solar-driven seawater desalination,can be realized *** show an oil-water separation efficiency of＞90％and a high evaporation rate of water of＞1.08 kg m-2 h-1 at 73 mW cm-2 are achieved,dem-onstrating the application prospect of the produced fiber felt.

关键词： Microstructured fiber Vibration cutting Felt-based water purification Oil-water separation Seawater desalination

来源：评论

学校读者我要写书评

暂无评论

Vibration control of the Rail Grinding Vehicle with Abrasive Belt Based on Structural Optimization and Lightweight Design

引用

Chinese Journal of Mechanical Engineering 2024年第3期37卷 311-337页

作者： Wengang Fan Shuai Zhang Zhiwei Wu Yi Liu Jiangnan Yu School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control TechnologyMinistry of EducationBeijing 100044China China Railway Materials Operation and Maintenance Technology Co. LtdBeijing 100036China

As a new grinding and maintenance technology,rail belt grinding shows significant advantages in many applications The dynamic characteristics of the rail belt grinding vehicle largely determines its grinding performance and service *** order to explore the vibration control method of the rail grinding vehicle with abrasive belt,the vibration response changes in structural optimization and lightweight design are respectively analyzed through transient response and random vibration simulations in this ***,the transient response simulation analysis of the rail grinding vehicle with abrasive belt is carried out under operating conditions and non-operating ***,the vibration control of the grinding vehicle is implemented by setting vibration isolation elements,optimizing the structure,and increasing ***,in order to further explore the dynamic characteristics of the rail grinding vehicle,the random vibration simulation analysis of the grinding vehicle is carried out under the condition of the horizontal irregularity of the American AAR6 ***,by replacing the Q235 steel frame material with 7075 aluminum alloy and LA43M magnesium alloy,both vibration control and lightweight design can be achieved *** results of transient dynamic response analysis show that the acceleration of most positions in the two working conditions exceeds the standard value in GB/T 17426-1998 *** optimizing the structure of the grinding vehicle in three ways,the average vibration acceleration of the whole car is reduced by about 55.1%from 15.6 m/s^(2) to 7.0 m/s^(2).The results of random vibration analysis show that the grinding vehicle with Q235 steel frame does not meet the safety conditions of 3σ.By changing frame material,the maximum vibration stress of the vehicle can be reduced from 240.7 MPa to 160.0 MPa and the weight of the grinding vehicle is reduced by about 21.7%from 1500 kg to 1175 *** modal analysis results indic

关键词： Vibration control Dynamic characteristics Structural optimization Lightweight design Modal analysis

来源：评论

学校读者我要写书评

暂无评论

Thickness measurement of Single-Mode Fiber Coating Layer Based on Forward Brillouin Scattering

引用

IEEE Sensors Journal 2025年第11期25卷 19332-19340页

作者： Zhang, Yongqi Wang, Tao Liu, Yijia Liu, Li Zhang, Mingjiang Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education College of Physics and Optoelectronic Engineering Taiyuan030024 China Taiyuan University of Technology Shanxi Key Laboratory of Precision Measurement Physics The College of Physics and Optoelectronic Engineering Taiyuan030024 China

The coating layer is essential for protecting and applying optical fibers. Nowadays, the thickness measurement of the coating layer relies on point measurement schemes, such as the side-looking light distribution method and mechanical method. However, there are some problems with the above methods, such as the tradeoff between resolution and field of view (FOV), the cutting of the measurement position, and the long measurement time. To overcome these problems, we propose a new method based on forward Brillouin scattering (FBS), which measures the coating layer thickness of single mode fibers (SMFs). The physical properties of the transverse acoustic field involved in FBS make it possible to measure the thickness of the fiber coating. The corresponding relationship between the transverse acoustic mode frequency and the diameter of the coating layer can be calculated. The coating layer thickness can be measured with high precision by measuring the frequency spectrum of FBS corresponding to multiple transverse acoustic modes at a given temperature. In the verification experiment, three types of SMF coated with polyimide are used as the sensing fiber to measure the thickness of the coating layer at multiple temperatures. The experimental results show that the error in the coating layer thickness obtained is less than 0.05 μm. To the best of our knowledge, this is the first demonstration of nondestructive, high-precision monitoring of fiber coating thickness. © 2025 IEEE.

关键词： Acoustic field measurement

来源：评论

学校读者我要写书评

暂无评论

In-Vehicle Network Injection Attacks Detection Based on Feature Selection and Classification

引用

Automotive Innovation 2024年第1期7卷 138-149页

作者： Haojie Ji Liyong Wang Hongmao Qin Yinghui Wang Junjie Zhang Biao Chen Key Laboratory of Modern Measurement and Control Technology Ministry of EducationBeijing Information Science and Technology UniversityBeijing 100192China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Hefei Innovation Research Institute Beihang UniversityHefei 230012China

Detecting abnormal data generated from cyberattacks has emerged as a crucial approach for identifying security threats within in-vehicle *** transmission of information through in-vehicle networks needs to follow specific data for-mats and communication protocols ***,statistical algorithms are employed to learn these variation rules and facilitate the identification of abnormal ***,the effectiveness of anomaly detection outcomes often falls short when confronted with highly deceptive in-vehicle network *** this study,seven representative classification algorithms are selected to detect common in-vehicle network attacks,and a comparative analysis is employed to identify the most suitable and favorable detection *** consideration of the communication protocol characteristics of in-vehicle networks,an optimal convolutional neural network(CNN)detection algorithm is proposed that uses data field characteristics and classifier selection,and its comprehensive performance is *** addition,the concept of Hamming distance between two adjacent packets within the in-vehicle network is introduced,enabling the proposal of an enhanced CNN algorithm that achieves robust detection of challenging-to-identify abnormal *** paper also presents the proposed CNN classifica-tion algorithm that effectively addresses the issue of high false negative rate(FNR)in abnormal data detection based on the timestamp feature of data *** experimental results validate the efficacy of the proposed abnormal data detection algorithm,highlighting its strong detection performance and its potential to provide an effective solution for safeguarding the security of in-vehicle network information.

关键词： Classification algorithm Anomaly detection In-vehicle network Feature extraction Injecting attack

来源：评论

学校读者我要写书评

暂无评论

Ultrasensitive SERF atomic magnetometer with a miniaturized hybrid vapor cell

引用

Microsystems & Nanoengineering 2024年第4期10卷 367-376页

作者： Yintao Ma Yao Chen Mingzhi Yu Yanbin Wang Shun Lu Ju Guo Guoxi Luo Libo Zhao Ping Yang Qijing Lin Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and SystemsXi’an Jiaotong UniversityXi’an 710049China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China School of Instrument Science and Technology Xi’an Jiaotong UniversityXi’an 710049China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing YantaiYantai 265503China

The chip-scale hybrid optical pumping spin-exchange relaxation-free(SERF)atomic magnetometer with a single-beam arrangement has prominent applications in biomagnetic measurements because of its outstanding features,including ultrahigh sensitivity,an enhanced signal-to-noise ratio,homogeneous spin polarization and a much simpler optical configuration than other *** this work,a miniaturized single-beam hybrid optical pumping SERF atomic magnetometer based on a microfabricated atomic vapor cell is *** the optically thin Cs atoms are spinpolarized,the dense Rb atoms determine the experimental *** enhanced signal strength and narrowed resonance linewidth are experimentally proven,which shows the superiority of the proposed magnetometer *** using a differential detection scheme,we effectively suppress optical noise with an approximate five-fold ***,the cell temperature markedly affects the performance of the *** systematically investigate the effects of temperature on the magnetometer *** theoretical basis for these effects is explained in *** developed miniaturized magnetometer has an optimal magnetic sensitivity of 20 fT/Hz^(1/2).The presented work provides a foundation for the chip-scale integration of ultrahighly sensitive quantum magnetometers that can be used for forward-looking magnetocardiography(MCG)and magnetoencephalography(MEG)applications.

关键词： pumping polarization magnetometer

来源：评论

学校读者我要写书评

暂无评论

Robotic mobile and mirror milling of large-scale complex structures

引用

National Science Review 2023年第5期10卷 10-13页

作者： Zenghui Xie Fugui Xie Limin Zhu Xin-Jun Liu State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical Engineering(DME) Tsinghua University Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Tsinghua University State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong University

Large-scale complex structures,such as spacecraft cabins,aircraft composite skins and launch vehicle fuel tanks,are the core components of the equipment in aerospace,energy,shipbuilding and other *** milling quality and efficiency are factors directly affecting the performance and productivity of spacecraft,aircraft and other key *** kind of structure generally features large dimension,high accuracy,

关键词：

来源：评论

学校读者我要写书评

暂无评论

DESIGN AND KINEMATICS ANALYSIS OF VERTICAL EXTERNAL MESHING BIOMASS PELLET FUEL FORMING MACHINE

International Journal of Mechatronics and Applied Mechanics

引用

International Journal of Mechatronics and Applied Mechanics 2023年第13期2023卷 30-37页

作者： Tingzhou, Ning Xuewu, Qian School of Mechanical Manufacturing Jinan Vocational College Jinan250103 China Jinan Key Laboratory of 5G + Advanced Control Technology Jinan250103 China

In order to reduce the energy consumption of die roll forming machine and improve the productivity of piston punch forming machine, this paper proposes a new type of biomass solidification forming method. Firstly, a comparative analysis of the three types of biomass solidification forming equipment was carried out in terms of their working principles and performance, which revealed the characteristics of each type of biomass solidification forming equipment. Secondly, a new type of biomass pellet fuel forming machine was designed by combining the characteristics of piston punch forming machine and die roll forming machine. During operation, the plungers on the roller engage with the holes in the ring die, and the biomass material is continuously compressed and densely formed in the ring die holes, which reduce the energy consumption and improved the productivity. Finally, a kinematics analysis of the key components of the forming machine was carried out based on SolidWorks, and the feasibility of the design scheme was verified. The design of this forming machine can be a reference for improving the productivity and reducing the energy consumption of biomass solidification forming equipment. © 2023, Cefin Publishing House. All rights reserved.

关键词： Biomass

来源：评论

学校读者我要写书评

暂无评论

Microstructure and property evolution of nitrogen supersaturated (AlNbTiZr)Nx high-entropy ceramic films: Effect of nitrogen ratios

引用

Ceramics International 2025年第16期51卷 21763-21775页

作者： Wang, Bingxu Li, Peng Cai, Zhaobing Lin, Guangpei Dong, Yinghui Gu, Le Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan430081 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Precision Manufacturing Institute Wuhan University of Science and Technology Wuhan430081 China Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China

High entropy ceramic (AlNbTiZr)Nx films with different nitrogen contents were prepared by magnetron sputtering at different nitrogen ratios (Rn). The phase composition, microstructure, mechanical and tribological properties of the films were characterized. The results show that nitrogen saturates rapidly in the films and the nitrogen content of the films increases slightly with the increase of Rn. The films deposited at Rn = 0 exhibited an amorphous structure, while those deposited at Rn = 0.83–16.67 % demonstrated an FCC structure. The hardness and modulus of the films varied without a clear regularity with increasing the deposited Rn, where the highest values of 32.95 GPa and 468.67 GPa were measured at Rn = 3.33 %, respectively. All films exhibited adequate wear resistance in the friction tests, except the alloy films deposited at Rn = 0. In particular, the films deposited at Rn = 16.67 % demonstrated exceptional wear resistance, with a minimum wear rate of 8.95 × 10−8 mm3 N−1 mm−1. Regarding the compositions of the abrasive debris and oxide film, the wear debris and oxide film were found to consist of TiO2, Nb2O5, Al2O3, and ZrO2 for all of the films except for that deposited at Rn = 0. However, the film deposited at Rn = 0 was worn out. In addition, it is found that the wear mechanism of the (AlNbTiZr)Nx films is mainly abrasive wear, while the wear mechanism of the AlNbTiZr film is abrasive and adhesive wear. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Oxide films

来源：评论

学校读者我要写书评

暂无评论

Planning of a Single Flow Channel in Valve Blocks Based on Additive manufacturing and the Ant Colony Algorithm

引用

Chinese Journal of Mechanical Engineering 2024年第5期37卷 191-202页

作者： Jin Zhang Ziyang Li Yuying Zhang Yandong Liu Ying Li Xiangdong Kong School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Qinhuangdao 066004China National&Local Joint Engineering Research Center for Advanced Manufacturing Technology and Equipment Qinhuangdao 066004China State Key Laboratory of Fluid Power and Mechatronic Systems Hangzhou 310027China

As electro-hydrostatic actuator(EHA)technology advances towards lightweight and integration,the demand for enhanced internal flow pathways in hydraulic valve blocks ***,owing to the constraints imposed by traditional manufacturing processes,conventional hydraulic integrated valve blocks fail to satisfy the demands of a more compact channel layout and lower energy ***,the subjectivity in the arrangement of internal passages results in a time-consuming and labor-intensive *** study employed additive manufacturing technology and the ant colony algorithm and B-spline curves for the meticulous design of internal passages within an aviation EHA valve *** layout environment for the valve block passages was established,and path optimization was achieved using the ant colony algorithm,complemented by smoothing using B-spline ***-dimensional modeling was performed using SolidWorks software,revealing a 10.03%reduction in volume for the optimized passages compared with the original *** fluid dynamics(CFD)simulations were performed using Fluent software,demonstrating that the algorithmically optimized passages effectively prevented the occurrence of vortices at right-angled locations,exhibited superior flow characteristics,and concurrently reduced pressure losses by 34.09%-36.36%.The small discrepancy between the experimental and simulation results validated the efficacy of the ant colony algorithm and B-spline curves in optimizing the passage design,offering a viable solution for channel design in additive manufacturing.

关键词： Hydraulic valve block Flow channel B-spline curve Additive manufacturing Ant colony algorithm

来源：评论

学校读者我要写书评

暂无评论

A bionic approach for the mechanical and electrical decoupling of an MEMS capacitive sensor in ultralow force measurement

引用

Frontiers of Mechanical Engineering 2023年第2期18卷 297-317页

作者： Wendi GAO Bian TIAN Cunlang LIU Yingbiao MI Chen JIA Libo ZHAO Tao LIU Nan ZHU Ping YANG Qijing LIN Zhuangde JIANG Dong SUN State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesOverseas Expertise Introduction Center for Micro/Nano Manufacturing and Nano Measurement Technologies Discipline InnovationXi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and SystemSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265599China State Key Laboratory of Robotics and Systems(HIT) Harbin 150006China Beijing Advanced Innovation Center for Intelligent Robots and Systems Beijing Institute of TechnologyBeijing 100081China Department of Biomedical Engineering City University of Hong KongHong KongChina

Capacitive sensors are efficient tools for biophysical force measurement,which is essential for the exploration of cellular ***,attention has been rarely given on the influences of external mechanical and internal electrical interferences on capacitive *** this work,a bionic swallow structure design norm was developed for mechanical decoupling,and the influences of structural parameters on mechanical behavior were fully analyzed and optimized.A bionic feather comb distribution strategy and a portable readout circuit were proposed for eliminating electrostatic *** instability was evaluated,and electrostatic decoupling performance was verified on the basis of a novel measurement method utilizing four complementary comb arrays and applicationspecific integrated circuit *** electrostatic pulling experiment showed that the bionic swallow structure hardly moved by 0.770 nm,and the measurement error was less than 0.009% for the area-variant sensor and 1.118% for the gap-variant sensor,which can be easily compensated in *** proposed sensor also exhibited high resistance against electrostatic rotation,and the resulting measurement error dropped below 0.751%.The rotation interferences were less than 0.330 nm and(1.829×10^(-7))°,which were 35 times smaller than those of the traditional differential *** on the proposed bionic decoupling method,the fabricated sensor exhibited overwhelming capacitive sensitivity values of 7.078 and 1.473 pF/μm for gap-variant and area-variant devices,respectively,which were the highest among the current *** immunity to mechanical disturbances was maintained simultaneously,i.e.,less than 0.369% and 0.058% of the sensor outputs for the gap-variant and area-variant devices,respectively,indicating its great performance improvements over existing devices and feasibility in ultralow biomedical force measurement.

关键词： micro-electro-mechanical system capacitive sensor bionics operation instability mechanical and electrical decoupling biomedical force measurement

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：