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A review of the techniques for the mold manufacturing of micro/nanostructures for precision glass molding 被引量:8
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作者 Tianfeng Zhou Yupeng He +7 位作者 Tianxing wang Zhanchen Zhu Ruzhen Xu Qian Yu Bin Zhao Wenxiang Zhao Peng Liu xibin wang 《International Journal of Extreme Manufacturing》 SCIE EI 2021年第4期23-54,共32页
Micro/nanostructured components play an important role in micro-optics and optical engineering,tribology and surface engineering,and biological and biomedical engineering,among other fields.Precision glass molding tec... Micro/nanostructured components play an important role in micro-optics and optical engineering,tribology and surface engineering,and biological and biomedical engineering,among other fields.Precision glass molding technology is the most efficient method of manufacturing micro/nanostructured glass components,the premise of which is meld manufacturing with complementary micro/nanostructures.Numerous mold manufacturing methods have been developed to fabricate extremely small and high-quality micro/nanostructures to satisfy the demands of functional micro/nanostructured glass components for various applications.Moreover,the service performance of the mold should also be carefully considered.This paper reviews a variety of technologies for manufacturing micro/nanostructured molds.The authors begin with an introduction of the extreme requirements of mold materials.The following section provides a detailed survey of the existing micro/nanostructured mold manufacturing techniques and their corresponding mold materials,including nonmechanical and mechanical methods.This paper concludes with a detailed discussion of the authors recent research on nickel-phosphorus(Ni-P)mold manufacturing and its service performance. 展开更多
关键词 precision glass molding mold manufacturing MICRO/NANOSTRUCTURE mold material extreme features
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Compressional Deformation in Indentation Process for Microlens Array Mold 被引量:1
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作者 Yaqun Bai xibin wang +2 位作者 Tianfeng Zhou Zhiqiang Liang Guang Li 《Journal of Beijing Institute of Technology》 EI CAS 2018年第1期15-21,共7页
The structure of a microlens array( MLA) can be formed on copper by an indentation process which is a new manufacture approach we applied here instead of a traditional method to test the material property,thereby wo... The structure of a microlens array( MLA) can be formed on copper by an indentation process which is a new manufacture approach we applied here instead of a traditional method to test the material property,thereby work time can be saved. Single-indentation and multi-indentation are both conducted to generate a single dimple and dimples array,namely micro lens and MLA. Based on finite element simulation method,factors affecting the form accuracy,such as springback at the compressed area of one single dimple and compressional deformation at the adjacent area of dimples arrays,are determined,and the results are verified by experiments under the same conditions. Meanwhile,indenter compensation method is proposed to improve form accuracy of single dimple,and the relationship between pitch and compressional deformation is investigated by modelling seven sets of multi-indentations at different pitches to identify the critical pitch for the MLA's indentation processing. Loads and cross-sectional profiles are measured and analyzed to reveal the compressional deformation mechanism. Finally,it is found that MLA at pitches higher than 1. 47 times of its diameter can be manufactured precisely by indentation using a compensated indenter. 展开更多
关键词 microlens array(MLA) indentation process compensation method compressional deformation
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Multi-functional optical fiber sensor system based on a dense wavelength division multiplexer
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作者 Yue-Xin Yin Zhifa Wu +4 位作者 Siwen Sun Liang Tian xibin wang Yuanda Wu Daming Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第7期222-224,共3页
We propose a novel and efficient multi-functional optical fiber sensor system based on a dense wavelength division multiplexer(DWDM).This system consists of an optical fiber temperature sensor, an optical fiber strain... We propose a novel and efficient multi-functional optical fiber sensor system based on a dense wavelength division multiplexer(DWDM).This system consists of an optical fiber temperature sensor, an optical fiber strain sensor, and a 48-channel DWDM.This system can monitor temperature and strain changes at the same time.The ranges of these two sensors are from-20℃ to 100℃ and from-1000 με to 2000 με, respectively.The sensitivities of the temperature sensor and strain sensor are 0.03572 nm/℃ and 0.03808 nm/N, respectively.With the aid of a broadband source and spectrometer,different kinds and ranges of parameters in the environment can be monitored by using suitable sensors. 展开更多
关键词 DENSE wavelength DIVISION multiplexer(DWDM) planar LIGHTWAVE circuit multi-functional SENSOR optical fiber SENSOR system
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Low-power electro-optic phase modulator based on multilayer graphene/silicon nitride waveguide
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作者 Lanting Ji Wei Chen +7 位作者 Yang Gao Yan Xu Chi Wu xibin wang Yunji Yi Baohua Li Xiaoqiang Sun Daming Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第8期302-309,共8页
Electro-optic modulator is a key component for on-chip optical signal processing.An electro-optic phase modulator based on multilayer graphene embedded in silicon nitride waveguide is demonstrated to fulfill low-power... Electro-optic modulator is a key component for on-chip optical signal processing.An electro-optic phase modulator based on multilayer graphene embedded in silicon nitride waveguide is demonstrated to fulfill low-power operation.Finite element method is adopted to investigate the interaction enhancement between the graphene flake and the optical mode.The impact of multilayer graphene on the performance of phase modulator is studied comprehensively.Simulation results show that the modulation efficiency improves with the increment of graphene layer number,as well as the modulation length.The 3-dB bandwidth of around 48 GHz is independent of graphene layer number and length.Compared to modulator with two-or four-layer graphene,the six-layer graphene/silicon nitride waveguide modulator can realizeπphase shift at a low-power consumption of 14 fJ/bit when the modulation length is 240μm. 展开更多
关键词 electro-optic modulator GRAPHENE silicon nitride WAVEGUIDE
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A federated learning scheme meets dynamic differential privacy
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作者 Shengnan Guo xibin wang +3 位作者 Shigong Long Hai Liu Liu Hai Toong Hai Sam 《CAAI Transactions on Intelligence Technology》 SCIE EI 2023年第3期1087-1100,共14页
Federated learning is a widely used distributed learning approach in recent years,however,despite model training from collecting data become to gathering parameters,privacy violations may occur when publishing and sha... Federated learning is a widely used distributed learning approach in recent years,however,despite model training from collecting data become to gathering parameters,privacy violations may occur when publishing and sharing models.A dynamic approach is pro-posed to add Gaussian noise more effectively and apply differential privacy to federal deep learning.Concretely,it is abandoning the traditional way of equally distributing the privacy budget e and adjusting the privacy budget to accommodate gradient descent federation learning dynamically,where the parameters depend on computation derived to avoid the impact on the algorithm that hyperparameters are created manually.It also incorporates adaptive threshold cropping to control the sensitivity,and finally,moments accountant is used to counting the∈consumed on the privacy‐preserving,and learning is stopped only if the∈_(total)by clients setting is reached,this allows the privacy budget to be adequately explored for model training.The experimental results on real datasets show that the method training has almost the same effect as the model learning of non‐privacy,which is significantly better than the differential privacy method used by TensorFlow. 展开更多
关键词 data privacy machine learning security of data
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Early chatter identification based on optimized VMD with multi-band information fusion and compression method in robotic milling process
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作者 Sichen CHEN Zhiqiang LIANG +5 位作者 Yuchao DU Zirui GAO Haoran ZHENG Zhibing LIU Tianyang QIU xibin wang 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第6期464-484,共21页
Undesirable self-excited chatter has always been a typical issue restricting the improvement of robotic milling quality and efficiency.Sensitive chatter identification based on processing signals can prompt operators ... Undesirable self-excited chatter has always been a typical issue restricting the improvement of robotic milling quality and efficiency.Sensitive chatter identification based on processing signals can prompt operators to adjust the machining process and prevent chatter damage.Compared with the traditional machine tool,the uncertain multiple chatter frequency bands and the band-moving of the chatter frequency in robotic milling process make it more challenging to extract chatter information.This paper proposes a novel method of chatter identification using optimized variational mode decomposition(OVMD)with multi-band information fusion and compression technology(MT).During the robotic milling process,the number of decomposed modes k and the penalty coefficient a are optimized based on the dominant component of frequency scope partition and fitness of the mode center frequency.Moreover,the mayfly optimization algorithm(MA)is employed to obtain the global optimal parameter selection.In order to conquer information collection about the uncertain multiple chatter frequency bands and the band-moving of the chatter frequency in robotic milling process,MT is presented to reduce computation and extract signal characteristics.Finally,the cross entropy of the image(CEI)is proposed as the final chatter indicator to identify the chatter occurrence.The robotic milling experiments are carried out to verify the proposed method,and the results show that it can distinguish the robotic milling condition by extracting the uncertain multiple chatter frequency bands and overcome the band-moving of the chatter frequency in robotic milling process. 展开更多
关键词 Robotic milling Chatter detection Variational mode decomposition Information fusion and compression Chatter featur
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Mode-insensitive and mode-selective optical switch based on asymmetric Y-junctions and MMI couplers
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作者 SHIJIE SUN QIDONG YU +4 位作者 YUANHUA CHE TIANHANG LIAN YUHANG XIE DAMING ZHANG xibin wang 《Photonics Research》 SCIE EI CAS CSCD 2024年第3期423-430,共8页
Driven by the large volume demands of data in transmission systems,the number of spatial modes supported by mode-division multiplexing(MDM)systems is being increased to take full advantage of the parallelism of the si... Driven by the large volume demands of data in transmission systems,the number of spatial modes supported by mode-division multiplexing(MDM)systems is being increased to take full advantage of the parallelism of the signals in different spatial modes.As a key element for photonic integrated circuits,the multimode waveguide optical switch(MWOS)is playing an important role for data exchange and signal switching.However,the function of the traditional MWOS is simple,which could only implement the mode-insensitive or mode-selective switching function;it is also difficult to scale to accommodate more spatial modes because of the limitation of the device structure.Therefore,it is still challenging to realize a multifunctional and scalable MWOS that could support multiple modes with low power consumption and high flexibility.Here,we propose and experimentally demonstrate a multifunctional MWOS based on asymmetric Y-junctions and multimode interference(MMI)couplers fabricated on a polymer waveguide platform.Both mode-insensitive and mode-selective switching functions can be achieved via selectively heating different electrode heaters.The fabricated device with the total length of∼0.8 cmshows an insertion loss of less than 12.1 dB,and an extinction ratio of larger than 8.4 dB with a power consumption of∼32 mW for both mode-insensitive and mode-selective switching functions,at 1550 nm wavelength.The proposed MWOS can also be scaled to accommodate more spatial modes flexibly and easily,which can serve as an important building block for MDM systems. 展开更多
关键词 WAVEGUIDE optical MODE
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Recent advancements in optical microstructure fabrication through glass molding process 被引量:7
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作者 Tianfeng ZHOU Xiaohua LIU +3 位作者 Zhiqiang LIANG Yang LIU Jiaqing XIE xibin wang 《Frontiers of Mechanical Engineering》 SCIE CSCD 2017年第1期46-65,共20页
Optical microstructures are increasingly applied in several fields, such as optical systems, precision measurement, and microfluid chips. Microstructures include microgrooves, microprisms, and microlenses. This paper ... Optical microstructures are increasingly applied in several fields, such as optical systems, precision measurement, and microfluid chips. Microstructures include microgrooves, microprisms, and microlenses. This paper presents an overview of optical microstructure fabrication through glass molding and highlights the applications of optical microstructures in mold fabrication and glass molding. The glass-mold interface friction and adhesion are also discussed. Moreover, the latest advance- ments in glass molding technologies are detailed, including new mold materials and their fabrication methods, viscoelastic constitutive modeling of glass, and micro- structure molding process, as well as ultrasonic vibration- assisted molding technology. 展开更多
关键词 optical microstructure microgroove micro-lens glass molding process single-point diamond cutting
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Influence of laser shock peening on surface integrity and tensile property of high strength low alloy steel 被引量:6
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作者 Yong wang Xiaoyu PAN +4 位作者 xibin wang Zhibing LIU Shuyao LIU Wenjuan WAN Puyi wang 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第6期199-208,共10页
Laser Shock Peening(LSP)is a well-established surface treatment commonly used to improve mechanical properties of material’s surfaces.To further understand the relationship between tensile property and fatigue life i... Laser Shock Peening(LSP)is a well-established surface treatment commonly used to improve mechanical properties of material’s surfaces.To further understand the relationship between tensile property and fatigue life improvement of high strength low alloy steel in the LSP process,LSP treatment of 32 CrNi high strength low alloy steel was carried out by YAG laser with pulse energy of 15 J,and tensile property was tested by electronic universal material testing machine.Surface morphology,residual stress and tensile fracture of the specimens before and after LSP were observed by white light interferometer(WLI),X-ray measuring apparatus and scanning electron microscope(SEM).Result shows that LSP did not change tensile strength of 32 CrNi steel but cause yield characteristic transform from obvious yield point to no yield phenomenon which is the only factor benefiting fatigue life,indicating that the increment of fatigue life was probably related to the disappearance of yield phenomenon.Formation mechanisms of tensile fractures and yield phenomenon induced by LSP at room temperature were also discussed and completely revealed.Deeper compressive residual stress and flat grains contributed to the transition of yield characteristic and lower elongation rate of 32 CrNi steel subjected to LSP. 展开更多
关键词 32CrNi steel Laser shock peening Residual stress Tensile property Yield characteristic
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Optical and scintillation properties of Ce:Y_(3)Al_(5)O_(12) single crystal fibers grown by laser heated pedestal growth method 被引量:2
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作者 xibin wang Yun Dai +4 位作者 Zhonghan Zhang Liangbi Su Huamin Kou Yangxiao wang Anhua Wu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2021年第12期1533-1539,I0003,共8页
The single crystal scintillating optical fibers acting as the scintillators and light conductors show potential application in scintillating fiber array detectors with high spatial resolution.In this paper we report t... The single crystal scintillating optical fibers acting as the scintillators and light conductors show potential application in scintillating fiber array detectors with high spatial resolution.In this paper we report the growth of 0.2 at%Ce:Y_(3)Al_(5)O_(12) single crystal fiber.The crystalline phase,surface morphology of the axialsection and cro ss-section,optical and scintillation properties of the as-grown fiber were investigated.The Ce:Y_(3)Al_(5)O_(12) single crystal fiber has a pure YAG phase,a uniform distribution of cerium in the axialsection and cross-section surface.Emission spectrum is composed of broad bands ranging from 440 to700 nm.In addition,the single crystal fiber has a high light yield of 26115±2000 photons/MeV,low energy resolution of 9.44%@662 keV and decay time of a fast component of 78 ns and a slow component of 301 ns.The intensity ratio of fast to slow components is roughly 8:1. 展开更多
关键词 Ce:Y_(3)Al_(5)O_(12) Single crystal fiber Laser heated pedestal growth method Rare earth Scintillator
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Mesoscale fabrication of a complex surface for integral impeller blades 被引量:2
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作者 xibin wang Tianfeng ZHOU +4 位作者 Lijing XIE Li JIAO Zhibing LIU Zhiqiang LIANG Pei YAN 《Frontiers of Mechanical Engineering》 SCIE CSCD 2017年第1期116-131,共16页
Integral impeller is the most important compo- nent of a mini-engine. However, the machining of a mesoscale impeller with a complex integral surface is difficult because of its compact size and high accuracy requireme... Integral impeller is the most important compo- nent of a mini-engine. However, the machining of a mesoscale impeller with a complex integral surface is difficult because of its compact size and high accuracy requirement. A mesoscale component is usually manufac- tured by milling. However, a conventional milling tool cannot meet the machining requirements because of its size and stiffness. For the fabrication of a complex integral impeller, a micro-ball-end mill is designed in accordance with the non-instantaneous-pole envelope principle and manufactured by grinding based on the profile model of the helical groove and the mathematical model of the cutting edge curve. Subsequently, fractal theory is applied to characterize the surface quality of the integral impeller. The fractal theory-based characterization shows that the completed mesoscale integral impeller exhibits a favorable performance in terms of mechanical properties and morphological accuracy. 展开更多
关键词 mesoscale fabrication micro-milling tool mesoscale milling impeller blade
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Modeling of the minimum cutting thickness in micro cutting with consideration of the friction around the cutting zone
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作者 Tianfeng ZHOU Ying wang +2 位作者 Benshuai RUAN Zhiqiang LIANG xibin wang 《Frontiers of Mechanical Engineering》 SCIE CSCD 2020年第1期81-88,共8页
Friction modeling between the tool and the workpiece plays an important role in predicting the minimum cutting thickness during TC4 micro machining and finite element method(FEM)cutting simulation.In this study,a new ... Friction modeling between the tool and the workpiece plays an important role in predicting the minimum cutting thickness during TC4 micro machining and finite element method(FEM)cutting simulation.In this study,a new three-region friction modeling is proposed to illustrate the material flow mechanism around the friction zone in micro cutting;estimate the stress distributions on the rake,edge,and clearance faces of the tool;and predict the stagnation point location and the minimum cutting thickness.The friction modeling is established by determining the distribution of normal and shear stress.Then,it is applied to calculate the stagnation point location on the edge face and predict the minimum cutting thickness.The stagnation point and the minimum cutting thickness are also observed and illustrated in the FEM simulation.Micro cutting experiments are conducted to validate the accuracy of the friction and the minimum cutting thickness modeling.Comparison results show that the proposed friction model illustrates the relationship between the normal and sheer stress on the tool surface,thereby validating the modeling method of the minimum cutting thickness in micro cutting. 展开更多
关键词 TOOL FRICTION minimum CUTTING thickness finite element method TOOL edge RADIUS micro CUTTING
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A plastic strain energy method exploration between machined surface integrity evolution and torsion fatigue behaviour of low alloy steel
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作者 Yong wang xibin wang +7 位作者 Zhibing LIU Shuyao LIU Sitao wang Hongtao CHEN Ci SONG Yifan BAI Pai wang Yang LIU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第10期412-429,共18页
To explore the evolution mechanism of multistage machining processes and torsional fatigue behaviour based on strain energy for the first time and provide process optimization of axis parts of low alloy steel for serv... To explore the evolution mechanism of multistage machining processes and torsional fatigue behaviour based on strain energy for the first time and provide process optimization of axis parts of low alloy steel for service performance,four multistage machining processes were applied to the 45Cr Ni Mo VA steel,including the Rough Turning process(RT),RT+the Finish Turning process(FRT),FRT+the Grinding process(GFRT)and RT+the Finish Turning process on dry cutting condition(FRT0).The result showed that the FRT process’s average low-cycle torsional fatigue life increased by 50%when it evolved from the RT process.The lower surface roughness of R1.3μm caused the total strain energy to increase by 163.8 Pa mm/mm instead of the unchanged strain energy density,and the crack feature evolved from some specific bulges to flat shear plane characteristics.When the GFRT process evolved from the FRT process,its average fatigue life increased by 1.45 times,compared with the RT process.Plastic strain amplitude decreased by 21%,and the strain energy density decreased by 4%due to more considerable compressive residual stress(-249 MPa).Plastic deformation layer depth had a consistent tendency with surface roughness.In this paper,surface integrity evolutions on cyclic characteristics and fatigue behaviour have also been explained.A fatigue life prediction model based on the energy method for machined surface integrity is proposed. 展开更多
关键词 Cyclic hysteresis loop Multistage machining processes Strain energy Surface integrity evolution Torsional fatigue
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Precision Milling of Integrated Turbine Based on a Non-Contact On-Machine Measurement System
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作者 Ying wang Tianfeng Zhou +3 位作者 Jia Zhou Min Li Zhiqiang Liang xibin wang 《Nanomanufacturing and Metrology》 EI 2022年第4期394-402,共9页
The machining accuracy of the curved surfaces of integrated turbine blades directly determines the performance and service life of the turbojet engine system.In this paper,a non-contact on-machine measurement system i... The machining accuracy of the curved surfaces of integrated turbine blades directly determines the performance and service life of the turbojet engine system.In this paper,a non-contact on-machine measurement system is developed for precision milling of integrated turbines to reduce the impact of workpiece deformation,overcutting,tool chatter,and material work hardening.Milling with the on-machine measurement system obtained high-quality integrated turbine surfaces.The geometric accuracy error(PV)is below 3μm,and the surface roughness(Ra)is less than 2μm.The processed integrated turbine blade can achieve the accuracy requirements in the design and manufacturing and can be practically applied to the entire turbojet engine. 展开更多
关键词 Integrated turbine Precision milling K418 superalloy On-machine measurement Topography compensation
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