The Experts below are selected from a list of 780 Experts worldwide ranked by ideXlab platform
H T Wang - One of the best experts on this subject based on the ideXlab platform.
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a theoretical and experimental investigation into five dof dynamic characteristics of an Aerostatic Bearing spindle in ultra precision diamond turning
International Journal of Machine Tools & Manufacture, 2013Co-Authors: S J Zhang, H T WangAbstract:Abstract In ultra-precision diamond turning (UPDT), spindle vibration has great influence on machining precision of high precision optical components. However, the spindle-vibration mechanism has not been fully understood. In this study, mathematical solutions for a proposed five-degree-of-freedom (FDOF) dynamic model of an Aerostatic Bearing spindle are derived to explore natural mechanisms of spindle vibration. Thus, the potential benefits of the solutions are to be applied for the prediction and optimization of the effects of spindle vibration on surface generation. Its dynamic characteristics possess three translational frequencies along the radial and axial directions, a spindle rotational frequency (SRF), and a pair of coupled tilting frequencies (CTFs) around the radial directions influenced the SRF. The theoretical results are identified by the frequency characteristics of thrust cutting forces, and the periodic, concentric, spiral, radial and two-fold patterns (PCSRPs) of the machined and simulated surface topographies, respectively.
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A theoretical and experimental investigation into five-DOF dynamic characteristics of an Aerostatic Bearing spindle in ultra-precision diamond turning
Elsevier, 2013Co-Authors: S J Zhang, To S, H T WangAbstract:In ultra-precision diamond turning (UPDT), spindle vibration has great influence on machining precision of high precision optical components. However, the spindle-vibration mechanism has not been fully understood. In this study, mathematical solutions for a proposed five-degree-of-freedom (FDOF) dynamic model of an Aerostatic Bearing spindle are derived to explore natural mechanisms of spindle vibration. Thus, the potential benefits of the solutions are to be applied for the prediction and optimization of the effects of spindle vibration on surface generation. Its dynamic characteristics possess three translational frequencies along the radial and axial directions, a spindle rotational frequency (SRF), and a pair of coupled tilting frequencies (CTFs) around the radial directions influenced the SRF. The theoretical results are identified by the frequency characteristics of thrust cutting forces, and the periodic, concentric, spiral, radial and two-fold patterns (PCSRPs) of the machined and simulated surface topographies, respectively.Department of Industrial and Systems Engineerin
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dynamic characteristics of an Aerostatic Bearing spindle and its influence on surface topography in ultra precision diamond turning
International Journal of Machine Tools & Manufacture, 2012Co-Authors: S J Zhang, Suet To, C F Cheung, H T WangAbstract:Abstract In ultra-precision diamond turning (UPDT), Aerostatic Bearing spindle vibration plays the major part in many factors that influence surface topographies. In this paper, a five-degree-of-freedom dynamic model for an Aerostatic Bearing spindle is built up to describe its dynamic responses, involving translational motions and tilting motions, and to analyze the effects on surface topography of the spindle vibration under different cutting processes in UPDT. It was found that the spindle processes at the axial natural frequency along the axial direction, the radial natural frequency along the radial directions and the twin tilting natural frequencies around the radial directions, and when cutting develops from outside to the center of the machined surface, the dominant effects of the spindle's tilting motions on surface topography gradually disappear and the axial translational motion produces a great influence on surface topography. This was identified by the experimental results.
S J Zhang - One of the best experts on this subject based on the ideXlab platform.
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a theoretical and experimental investigation into five dof dynamic characteristics of an Aerostatic Bearing spindle in ultra precision diamond turning
International Journal of Machine Tools & Manufacture, 2013Co-Authors: S J Zhang, H T WangAbstract:Abstract In ultra-precision diamond turning (UPDT), spindle vibration has great influence on machining precision of high precision optical components. However, the spindle-vibration mechanism has not been fully understood. In this study, mathematical solutions for a proposed five-degree-of-freedom (FDOF) dynamic model of an Aerostatic Bearing spindle are derived to explore natural mechanisms of spindle vibration. Thus, the potential benefits of the solutions are to be applied for the prediction and optimization of the effects of spindle vibration on surface generation. Its dynamic characteristics possess three translational frequencies along the radial and axial directions, a spindle rotational frequency (SRF), and a pair of coupled tilting frequencies (CTFs) around the radial directions influenced the SRF. The theoretical results are identified by the frequency characteristics of thrust cutting forces, and the periodic, concentric, spiral, radial and two-fold patterns (PCSRPs) of the machined and simulated surface topographies, respectively.
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A theoretical and experimental investigation into five-DOF dynamic characteristics of an Aerostatic Bearing spindle in ultra-precision diamond turning
Elsevier, 2013Co-Authors: S J Zhang, To S, H T WangAbstract:In ultra-precision diamond turning (UPDT), spindle vibration has great influence on machining precision of high precision optical components. However, the spindle-vibration mechanism has not been fully understood. In this study, mathematical solutions for a proposed five-degree-of-freedom (FDOF) dynamic model of an Aerostatic Bearing spindle are derived to explore natural mechanisms of spindle vibration. Thus, the potential benefits of the solutions are to be applied for the prediction and optimization of the effects of spindle vibration on surface generation. Its dynamic characteristics possess three translational frequencies along the radial and axial directions, a spindle rotational frequency (SRF), and a pair of coupled tilting frequencies (CTFs) around the radial directions influenced the SRF. The theoretical results are identified by the frequency characteristics of thrust cutting forces, and the periodic, concentric, spiral, radial and two-fold patterns (PCSRPs) of the machined and simulated surface topographies, respectively.Department of Industrial and Systems Engineerin
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dynamic characteristics of an Aerostatic Bearing spindle and its influence on surface topography in ultra precision diamond turning
International Journal of Machine Tools & Manufacture, 2012Co-Authors: S J Zhang, Suet To, C F Cheung, H T WangAbstract:Abstract In ultra-precision diamond turning (UPDT), Aerostatic Bearing spindle vibration plays the major part in many factors that influence surface topographies. In this paper, a five-degree-of-freedom dynamic model for an Aerostatic Bearing spindle is built up to describe its dynamic responses, involving translational motions and tilting motions, and to analyze the effects on surface topography of the spindle vibration under different cutting processes in UPDT. It was found that the spindle processes at the axial natural frequency along the axial direction, the radial natural frequency along the radial directions and the twin tilting natural frequencies around the radial directions, and when cutting develops from outside to the center of the machined surface, the dominant effects of the spindle's tilting motions on surface topography gradually disappear and the axial translational motion produces a great influence on surface topography. This was identified by the experimental results.
Junwen Wang - One of the best experts on this subject based on the ideXlab platform.
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A calculation method on the performance analysis of the thrust Aerostatic Bearing with vacuum pre-load
Tribology International, 2017Co-Authors: Ming Huang, Baorui Wang, Junwen WangAbstract:Abstract Thrust Aerostatic Bearing with vacuum pre-load (VPL pads) is a kind of effective supporting structure with simple mechanism and well stiffness. In this paper, a calculation method is presented to calculate the static characteristics of the VPL pads. Based on finite difference method (FDM), an efficient iterative algorithm is developed to decrease the iterative times. Compared to the experiment results, it shows that the calculation method can predict the static characteristics exactly.
Ming Huang - One of the best experts on this subject based on the ideXlab platform.
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Analysis and Optimization of Performance Under Operating Condition of Thrust Aerostatic Bearing with Vacuum Pre-load
Advances in Mechanical Design, 2020Co-Authors: Mengyang Li, Qiu Hu, Pinkuan Liu, Ming HuangAbstract:Thrust Aerostatic Bearing with vacuum pre-load (VPL pad) is used in high-precision application. In some cases, performance of Bearing not only needs to be optimal, but also needs good stability. In this paper, a parameter called stiffness volatility is defined to represent stability of performance of VPL pad under operating condition. It shows that parameters such as vacuity, area ratio and positive pressure distinctly affect stiffness volatility of VPL pad. There is significant interaction between those effect factors. Through adjusting parameter combination, optimized performance of VPL pad under operating condition is obtained.
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A calculation method on the performance analysis of the thrust Aerostatic Bearing with vacuum pre-load
Tribology International, 2017Co-Authors: Ming Huang, Baorui Wang, Junwen WangAbstract:Abstract Thrust Aerostatic Bearing with vacuum pre-load (VPL pads) is a kind of effective supporting structure with simple mechanism and well stiffness. In this paper, a calculation method is presented to calculate the static characteristics of the VPL pads. Based on finite difference method (FDM), an efficient iterative algorithm is developed to decrease the iterative times. Compared to the experiment results, it shows that the calculation method can predict the static characteristics exactly.
Wenjie Chen - One of the best experts on this subject based on the ideXlab platform.
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Development of an Aerostatic Bearing system for roll-to-roll printed electronics
Journal of Micromechanics and Microengineering, 2018Co-Authors: Shasha Chen, Weihai Chen, Jingmeng Liu, Wenjie Chen, Yan JinAbstract:Roll-to-roll printed electronics is proved to be an effective way to fabricate electrical devices on various substrates. High precision overlay alignment plays a key role to create multi-layer electrical devices. Multiple rollers are adopted to support and transport the substrate web. In order to eliminate the negative effect of the machining error and assembling error of the roller, a whole roll-to-roll system including two Aerostatic Bearing devices with arrayed restrictors is proposed in this paper. Different to the conventional roller, the Aerostatic Bearing device can create a layer of air film between the web and the device to realize non-contact support and transport. Based on simplified Navier–Stokes equations, the theoretical model of the air film is established. Moreover, the pressure distribution of the whole flow field and single restrictor in different positions are modeled by conducting numerical simulation with computational fluid dynamics (CFD) software FLUENT. The load capacity curves and stiffness curves are generated to provide guidance for optimizing the structure of the device. A prototype of the Aerostatic Bearing system is set up and the experiment tests are carried out. For the proposed Aerostatic Bearing roller with a diameter of 100 mm and length of 200 mm, the experimental results show the Aerostatic Bearing method can achieve the position accuracy in a range of 1 μm in the vertical direction of the web, which is much better than that using existing methods.
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ICARCV - An Aerostatic Bearing device with arrayed restrictors for roll-to-roll printed electronics
2016 14th International Conference on Control Automation Robotics and Vision (ICARCV), 2016Co-Authors: Shasha Chen, Weihai Chen, Jingmeng Liu, Wenjie ChenAbstract:High precision overlay alignment is of great importance to guarantee the quality of Roll-to-Roll printed electronics (R2RPE) products. Aiming at removing machining and assembling errors of the roller with both support and transport uses, an Aerostatic Bearing device with arrayed restrictors is proposed. In this paper the design of the whole device is presented. The mathematical model of the air film existed between the flexible substrate and the Aerostatic Bearing device is given by adopting simplified Navier-Stokes equations. In order to modeling the pressure distribution of the air film, numerical simulation is processed with Computational Fluid Dynamics (CFD) software FLUENT. Load capacity curve and stiffness cure are generated to optimize the size and distribution of restrictors on the device. The simulation results indicate that: 1) air film with homogeneous pressure distribution is obtained from the designed arrayed restrictors; 2) diameter of the restrictors has a major influence on load capacity and stiffness when the number of the restrictors reaches a certain quantity.
