Article
Chemistry, Analytical
Yue Liu, Yintian Xing, Hang Fu, Chuang Li, Chao Yang, Bo Cao, Changxi Xue
Summary: Precision glass molding (PGM) technology is efficient for producing micro/nanostructured glass components with complex geometries. Finite element analysis was used to study glass preform deformation, resulting in a model that can optimize PGM processing parameters.
Article
Materials Science, Multidisciplinary
Jingwei Zhao, Zhengyi Jiang, Zhihua Wang, Shengbo Sang, Leszek A. Dobrzanski, Ming Yang, Xiaoguang Ma, Yongzhen Wang
Summary: In this study, a numerical simulation model based on crystal plasticity theories was established to investigate the micro deep drawing process of ferritic stainless steel 430 foils. The results of the simulation matched well with experimental data, demonstrating the applicability of the model for analyzing the forming performance of the foils. The study revealed that annealing temperatures of 850 and 900 degrees Celsius are optimal for improving both the surface quality of the drawn cups and the formability of the foils. Thinning occurs significantly at the nose radius area, while the cup mouth area experiences the maximum thickness due to metal flow. Applying appropriate blank holding force during the micro deep drawing process can enhance the surface quality of the cups.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Fei Sun, Jian Yang, Jianan Fu, Bei Wang, Jiang Ma, Jun Shen
Summary: A method for preparing metallic molds based on the thermoplastic forming ability of metallic glasses has been proposed, successfully fabricating optical glass components with excellent optical properties.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Ceramics
Anh Tuan Vu, Rocio de los Angeles Avila Hernandez, Tim Grunwald, Thomas Bergs
Summary: Nonisothermal glass molding (NGM) is a technology to fabricate complex and precision optical elements in high production volumes. However, the high form deviation of manufactured glass optics is a challenge. In this research, the focus is on understanding the nonequilibrium thermoviscoelasticity of glass to control the final shape and optical characteristics. Experimental investigations and modeling are conducted to study the viscoelastic deformation responses of glass under different conditions. A new modeling method is proposed that incorporates temperature and thermal history into the rheological model parameters. The results show that the model can accurately predict the time-dependent responses of glass in both equilibrium and nonequilibrium regimes.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Multidisciplinary
Jiajie Li, Shengfeng Zhu
Summary: In this study, we consider the optimization of energy dissipation under the constraint of steady fluid flows described by the Navier-Stokes equations. Due to the nonlinearity of the Navier-Stokes equation, the computational cost of its numerical solver is high, resulting in inefficient shape optimization algorithms. To address this issue, we propose a new efficient shape gradient algorithm using a two-grid solver for the Navier-Stokes equation. We demonstrate the asymptotically optimal convergence rate of the mixed finite-element approximation of the two-grid distributed shape gradient. Our approach also includes a Uzawa iterative scheme for Stokes-type systems in the two-grid solver and a new scalar-type shape gradient flow to significantly improve computational efficiency, especially in three dimensions. Numerical experiments are conducted to validate the theoretical analysis and demonstrate the effectiveness of the two-grid shape gradient optimization algorithms.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Civil
Mihai Nedelcu
Summary: The inverse Finite Element Method (iFEM) is used to reconstruct the deformation of structures based on measured strains, which is important in Structural Health Monitoring. However, in shell structures with complex deformation, the number of in-situ strain gauges required for accurate results can be impractical. The Generalised Beam Theory (GBT) uses bar finite elements to describe the complex deformation of thin-walled beam members as a linear combination of pre-determined cross-section deformation modes. This paper proposes an iFEM/GBT formulation for shape sensing of thin-walled cylinders, achieving a significant reduction in strain gauges compared to the classic inverse-shell finite elements.
THIN-WALLED STRUCTURES
(2023)
Article
Automation & Control Systems
Chil-Chyuan Kuo, Zheng-Yan You
Summary: The study verified the feasibility of increasing mold thickness to maintain the structural strength of injection molding tool with cooling channels. The results can provide a reference for the design of conformal cooling channels.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Mathematics, Applied
Hui Yang, Shengfeng Zhu
Summary: In this paper, shape optimization in incompressible Stokes flows is investigated based on the penalty method for the divergence free constraint at continuous level. Shape sensitivity analysis is performed, and numerical algorithms are introduced. An iterative penalty method is used for solving the penalized state and possible adjoint numerically, and it is shown to be more efficient than the standard mixed finite element method in 2D. Asymptotic convergence analysis and error estimates for finite element discretizations of both state and adjoint are provided, and numerical results demonstrate the effectiveness of the optimization algorithms.
APPLIED NUMERICAL MATHEMATICS
(2024)
Article
Materials Science, Ceramics
Wei Yang, Zhen Zhang, Wuyi Ming, Ling Yin, Guojun Zhang
Summary: This study investigates the influence of molding temperature and pressure on shape deviation, crack area, and surface quality of ultra-thin glass in the ultra-thin glass molding process. The finite element model and simulation method are used to study typical forming defects, and the results show that molding temperature has a significant effect on shape deviation, crack area, and surface quality, while molding pressure is only strongly correlated with shape deviation and crack area.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Marcin Kozlowski, Kinga Zemla, Magda Kosmal, Oleksij Kopylow
Summary: The article investigates the behavior of 185 toughened glass samples of different thicknesses under impact and proposes a load duration factor for toughened glass based on numerical simulations. The study aims to determine the critical drop height causing glass fracture, and also showcases the practical value of the modeling methodology and results through a case study.
Article
Mechanics
Jonas Nieschlag, Philipp Eisenhardt, Sven Coutandin, Juergen Fleischer
Summary: The study focuses on numerical analysis of rotational molded composite tie rods with optimized geometry to achieve higher mechanical tensile loads.
COMPOSITE STRUCTURES
(2021)
Article
Polymer Science
Sharlin Shahid, Eskil Andreasson, Viktor Petersson, Widaad Gukhool, Yuchi Kang, Sharon Kao-Walter
Summary: Injection-molded polyethylene plates exhibit highly anisotropic mechanical behavior. This article studies three different anisotropic yield criteria and compares their accuracy and computation time in finite element modeling. It is concluded that Barlat Yld91 and Barlat Yld2004-18P yield criteria can be calibrated with a few tensile tests and still capture anisotropy in deformation-stress-strain.
Article
Mathematics, Applied
Shuangbing Guo, Xiliang Lu, Zhiyue Zhang
Summary: In this paper, an optimization algorithm is studied for computing the smallest eigenvalue of the Schrodinger operator with volume constraint. A finite element discretization is used to establish the numerical solution, and an error estimate is provided. The optimal solution is approximated using a fixed point iteration scheme, and a monotonic decreasing algorithm is developed for solving the eigenvalue optimization problem. Numerical simulations demonstrate the efficiency of the proposed method.
Article
Materials Science, Composites
Justin D. Miller, Jan-Anders E. Mansson
Summary: The development of design guidelines and analysis techniques is crucial for the adoption of 3D tow reinforced hybrid-molded structures. The discrepancies in fiber length caused by the cross-sectional dimensions of the tow bundle result in tow spreading and local fiber waviness. The effects of simulating the resulting fiber orientations and effective elastic properties are investigated through modeling and comparing with previous experimental results. Accounting for fiber waviness greatly improves part stiffness predictions in tension, while spread tow bundles enhance strength and stiffness predictions compared to simulations with a uniform cross section. The behavior under bending load is significantly influenced by the overmolding material.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
F. Dassi, P. Di Barba, A. Russo
Summary: This paper proposes an innovative technique that uses the virtual element method (VEM) to handle meshes with general polygonal and polyhedral elements for optimal shape design problems. The shape synthesis of a magnetic pole is taken as a case study.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Automation & Control Systems
Jing Hong, Lin Zhang, Zhiyu Zhang, Hu Huang, Jiwang Yan
Summary: A comparative study was conducted on mechanical polishing (MP) and laser polishing (LP) as methods for improving the quality of laser-nitrided surfaces. The results showed that LP significantly reduced surface roughness and achieved remarkable improvements in surface quality.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Lin Zhang, Yusuke Sato, Jiwang Yan
Summary: This manuscript proposes a novel adaptive control points sampling strategy to improve form accuracy and retain as many micro surface features as possible. By adjusting the sampling stepovers between control points to adapt to surface profile variation, the proposed method constrains interpolation error within tolerance and eliminates issues of insufficient/excessive control points in the machining area. Compared to the constant sampling method, the form error of the proposed method is reduced by about 35% in both theoretical predictions and experimental measurements with the same number of control points. This technique provides a new route for allocating control points in FTS diamond turning to achieve high form accuracy and machining efficiency in the fabrication of freeform optics.
JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING
(2023)
Article
Engineering, Industrial
Weihai Huang, Jiwang Yan
Summary: Ultrasonic vibration cutting (UVC) is a promising technology for processing hard-brittle materials in a ductile mode. This study used cyclic nanoindentation to reveal the mechanism of UVC in monocrystalline silicon (Si) and found that cyclic loading promotes silicon amorphization and decreases the threshold for phase transition. Furthermore, the critical cutting depth for brittle-to-ductile transition and the degree of amorphization in cutting chips increase in UVC compared to conventional cutting.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Mingming Cui, Hu Huang, Lin Zhang, Jiwang Yan
Summary: In this study, a new nanosecond laser pulling method is proposed to fabricate micro-nano structures on metallic glasses. The formation mechanism and evolution of the micro-nano bulge are investigated, and various micro-nano structures are successfully created on the MG surface, affecting the surface optical diffraction. Overall, this study provides a highly flexible and controllable method for the fabrication of micro-nano structures on MGs.
Review
Engineering, Manufacturing
Weihai Huang, Jiwang Yan
Summary: Brittle materials are widely used in optics, optoelectronics, and semiconductors. Ultraprecision machining of brittle materials can improve their functional performance and lifespan. This paper provides a comprehensive overview of recent advances in ultraprecision machining of soft-brittle materials, comparing different machining methods and analyzing their effects on tool-workpiece interactions. The paper also identifies challenges in engineering applications and provides solutions and guidelines for future research and development.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2023)
Article
Materials Science, Ceramics
Zhanchen Zhu, Tianfeng Zhou, Yupeng He, Qian Yu, Xibin Wang, Tao Yan, Jiwang Yan, Haihui Ruan
Summary: In this study, a novel two-step precision glass molding (PGM) process is proposed for the fabrication of chalcogenide (ChG) glasses with micro-nano structure arrays. A nickel-phosphorus (Ni-P) mold is used to transfer the antireflective micro-nano structure array to silicate glass, which is then used as a mold to replicate the structured surface onto the ChG glass. The results demonstrate high forming accuracy and favorable infrared optical transmission characteristics of the ChG glass micro-nano structure array, while the silicate glass proves to be a suitable mold material for the ChG glass molding process. This work provides a novel PGM technique for ChG glass materials.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Jing Hong, Haoxiang Wu, Hu Huang, Lin Zhang, Zhiyu Zhang, Minqiang Jiang, Jiwang Yan
Summary: In this study, nanosecond laser nitriding was used to improve the surface hardness and tribological characteristics of metallic glasses. Three laser nitrided surfaces with different hardness were prepared and their tribological characteristics were systematically investigated. The results showed that the hardness of the laser nitrided surfaces increased by 47.94%, 114.56%, and 171.99% compared to the original alloy, and the coefficients of friction were reduced by 29.12%, 65.05%, and 71.84%, respectively. Additionally, the scratch damage mechanisms were analyzed based on the various features of residual scratches and surrounding chips under different conditions.
Article
Materials Science, Multidisciplinary
Yuka Yamamuro, Tomotaka Shimoyama, Jiwang Yan
Summary: Femtosecond pulsed laser irradiation was used to generate numerous nanopores on the surface of yttria-stabilized zirconia (YSZ) without causing thermal damage to the material. The nanopore generation mechanism involved light focusing and ablation inside the YSZ grains. This study demonstrates the feasibility of selectively fabricating nanopores on YSZ surfaces for various applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Weihai Huang, Jiwang Yan
Summary: In this study, the tool-workpiece interaction mechanisms in cutting curved microstructures on 4H-SiC (0001) were explored through ultraprecision diamond turning. It was found that microcracks easily occurred in the feed-in/cut-in area of the micro-dimples due to large friction-induced tensile stress. Dimples located on different cleavage directions exhibited varying tendencies to cause surface cracking and had different subsurface damage characteristics.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2023)
Article
Materials Science, Multidisciplinary
Chao Wang, Hu Huang, Mingming Cui, Zhiyu Zhang, Lin Zhang, Jiwang Yan
Summary: Superhydrophobicity was achieved on the FeCoCrMnNi surface by synergistic laser texturing and low temperature annealing. Textured surfaces exhibited excellent superhydrophobicity at different hatching intervals and a maximum contact angle of 165 degrees was obtained. The created superhydrophobic surfaces possessed good liquid capture, self-cleaning capabilities, and enabled magnification for optical imaging.
JOURNAL OF LASER APPLICATIONS
(2023)
Article
Engineering, Industrial
Yupeng He, Tianfeng Zhou, A. Senthil Kumar, Xibin Wang, Jiwang Yan
Summary: The shear interference and chip removal interference between different tool edges during non-free cutting are the main reasons for the deformation of micron-submicron grooves. This paper presents a new variable shear angle removal model to understand the material removal mechanism and cutting-induced deformation of micron-submicron grooves in non-free cutting. Finite element simulations and high-speed cutting experiments are conducted to analyze the cutting microstate and dynamic deformation of the micron-submicron grooves.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Shigeru Tanikawa, Yusuke Sato, Jiwang Yan
Summary: With the advancement of optical technologies such as VR and 3D sensing, there is a growing demand for optical components with complex shapes. Ultra-precision diamond turning is a common method used for freeform optics. However, a time delay caused by the independent control system of the fast tool servo (FTS) can lead to angular misalignment and form errors. In this paper, a novel method for measuring and compensating for the time delay was proposed, resulting in improved form accuracy for freeform optics.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Toshiki Tsuchida, Weihai Huang, Jiwang Yan
Summary: This study investigates the processing characteristics of yttria-stabilized zirconia (YSZ) ceramic under ultrasonic vibration-assisted burnishing (UVB) enhanced by flexible stage and tool rotation techniques. The results show that the use of flexible stage-enhanced UVB reduces the fluctuation of burnishing force and produces a smooth surface with a reduced surface roughness. The use of tool rotation-enhanced UVB forms arc-shaped surface textures and further reduces the surface roughness. Stress-induced phase transformation of YSZ is observed in all burnished surfaces. This study demonstrates the feasibility of manufacturing YSZ with a smooth surface and high residual compressive stress.
PRODUCTION ENGINEERING-RESEARCH AND DEVELOPMENT
(2023)
Article
Engineering, Manufacturing
Mohamed Wagih, Ibrahem Maher, Hassan El-Hofy, Jiwang Yan, Mohsen A. Hassan
Summary: Trochoidal milling is a machining method used to extend cutting tool life. This paper analyzes and experiments the elliptical tool path and proposes a novel linear-elliptical tool path to enhance the performance. The effects on material removal rate, cutting forces, walls waviness, and surface roughness are investigated. The results show improved material removal rate and surface quality, making the linear-elliptical paths promising in increasing the performance of trochoidal milling.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Industrial
Weihai Huang, Kodai Nagayama, Jiwang Yan
Summary: This study investigates the fabrication of spherical and hexagonal microlens arrays on calcium fluoride (CaF2) using diamond turning. The study demonstrates that microcracks tend to be generated during the cutting process, especially when cutting along specific directions. By reducing the maximum undeformed chip thickness and using a depth-offsetting segment cutting method, high-quality microlens arrays without surface cracking can be achieved. This study proves the feasibility of fabricating high-quality freeform microstructured surfaces on CaF2 and other soft-brittle materials through diamond turning.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Junichi Kouguchi, Hayato Yoshioka
Summary: A new monitoring method for milling process using signal analysis of acceleration sensors is proposed in this research, which can solve the difficulty in estimating cutting forces for small diameter tools.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Weijie Wang, Yanling Tian, Zhao Zhang, Zhilai Lu, Fujun Wang, Dawei Zhang
Summary: This paper proposes a comprehensive model for predicting the cutting depth and contact area in nanoscratching. The model takes into account the geometric shape of the indenter and elastic recovery, reducing prediction errors. The study also analyzes the influence of the indenter geometry on the contact area, with the face angle of the pyramid identified as a key factor.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Qiaolin Li, Yuki Shimizu, Xiaohao Wang, Xinghui Li, Wei Gao
Summary: This paper introduces a stitching linear scan method for roundness and diameter measurement of small cylinders, using a ruby ball stylus as hardware filtering to eliminate the influence of high-frequency data. Experimental results show that the repeatability of the ruby ball stylus is better than the diamond stylus.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Chaturaporn Kerdkaew, Surasak Kaewpho, Sakchai Chomkokard, Theera Yaemglin, Ittipon Cheowanish, Noparit Jinuntuya, Wiwat Wongkokua
Summary: A new calibration standard for a CMOS-based autocollimator using an optical angle generator with a submillimeter strip reflector (OAG-SSR) is proposed. This method provides angular values along the measuring range of the autocollimator without any mechanical movement, enabling a faster calibration process, which is suitable for integration with production lines.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Haohao Tao, Tongjie Li, Feng Chen, Jinwei Fan, Ri Pan
Summary: In this paper, a novel OTA method is proposed that considers the relationship between tolerance of machine tools' key parts and volumetric error. A volumetric error prediction model is established based on the bridge between geometric error and tolerance. Additionally, a Processing Simplicity Index (PSI) is introduced to replace manufacturing cost and a tolerance-PSI model is established. An OTA model is formulated to minimize volumetric error and maximize PSI. The feasibility and effectiveness of the method are validated through simulations and experiments.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Xiumin Zhang, Jianhua Liu, Huanxiong Xia, Xiaohui Ao, Jiechen Zhou, Zhihao Fu
Summary: A comprehensive finite-element model was developed in this paper to study the evolution of surface figure in high-precision bonded mirrors. The cure kinetics and mechanical behaviors of the optical adhesive were experimentally examined and modeled, and the effects of environmental factors on the surface-figure accuracy and stability were further investigated.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Peng Wang, Bin Chen, Jian Li, Jianwei Wang, Yingjie Zhang, Kai Feng
Summary: This paper proposes an aerostatic bearing with damper modules to suppress vibration on the bearing surface. The stiffness and damping characteristics can be adjusted by changing the thickness of the sheets, resulting in effective vibration suppression.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Lei Yang, Xiaoguang Guo, Renke Kang, Xianglong Zhu, Yufan Jia, Hao Wang
Summary: This paper develops an analytical model that takes into account the pad surface morphology to predict the evolution of the workpiece surface shape. The model considers the cross-scale relationship between the formation of lapped surface shape and the scratching process of a single abrasive grain. The simulated and experimental results validate the correctness and validity of the model, providing new ideas for controlling the workpiece surface.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Gabriele Piscopo, Alessandro Salmi, Eleonora Atzeni
Summary: This paper proposes an artifact for the LP-DED process and evaluates its dimensional accuracy and geometrical tolerances. The findings show that the tolerances of the LP-DED process are comparable to sand casting, lower than LB-PBF technologies, but similar to EB-PBF technologies.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Liang Xue, Ningsong Qu
Summary: This study focuses on the key issues of improving material removal rate and surface quality in macro-electrolyte jet machining. By introducing a novel tool with the rear-end tilted, the current density of the workpiece surface can be increased, leading to improved machining performance. Experimental results show that the tool with a rear-end tilt angle of 15 degrees significantly enhances the material removal rate and reduces surface roughness compared to the standard tool.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Ping Yang, Kaixin Luo, Runxi Wu
Summary: This article proposes a new calibration device to measure the spatial errors of a six-axis serial robot. The device compensates for errors by modifying angles and identifying stiffness parameters, and experiments verify its effectiveness.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Shilei Wu, Mingxiang Ling, Yingbin Wang, Tao Huang
Summary: This paper studies the electromechanical behavior of elliptical APAs by analyzing the multi-domain dynamics of piezoelectric stacks and compliant mechanisms using a novel electro-mechanical transfer matrix method. An analytical electro-elasto transfer matrix of piezoelectric stacks operating at the d33 mode is derived in the form of Taylor's series. The dynamic response spectrum of displacement and impedance for elliptical APAs is accurately captured by this electro-mechanical model, and different topologies of elliptical APAs are compared to suggest the optimal configuration.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Lei Meng, Yusheng Liu, Ying Yan, Dongming Guo, Ping Zhou
Summary: This study explores electrochemically induced chemical etching (ECICE) as a method to achieve nanogram-level, low-cost, stress-free, and stable material removal of fused quartz. The key factors affecting removal minimum and stability are revealed through modeling analysis and testing. A proposed method achieves precision stable removal with satisfactory results at the nanogram level.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Hong Yao, Hai Bi, Junjie Wei, Shuo Zhan, Fangxin Chen, IEEE
Summary: This paper presents a dual-loop control syringe-based picoliter-scale injection system for high-precision microinjection. The system utilizes an inner pneumatic servo loop and an outer position servo loop to achieve precise control. The experimental results demonstrate that the system can regulate the smallest droplet size to within 0.25 pL.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Engineering, Multidisciplinary
Jinchun Yuan, Jiasheng Li, Ye Ding
Summary: In this paper, a simple and effective internal model control (IMC) system is proposed to attenuate thrust ripples in ultraprecision air-bearing linear feed systems, based on a modified modeling and identification method of permanent magnet linear synchronous motors (PMLSMs). The performance of the proposed method in overcoming nonlinearity and achieving smooth velocities in steady states is demonstrated through analysis and experiments.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
