The Experts below are selected from a list of 6045 Experts worldwide ranked by ideXlab platform
Ching-hua Deng - One of the best experts on this subject based on the ideXlab platform.
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Application of Petri Net in the planning of a shearing-cut and bending progressive die workstation
International Journal of Materials and Product Technology, 2001Co-Authors: Zone-ching Lin, Ching-hua DengAbstract:The method for analysing the strip workstation of shearing-cut and bending progressive dies is studied. First, the Petri Net model is used to construct the work conditions and synthesizing method of each workstation of the shearing-cut and bending progressive die. The model is able to clearly represent the systems hierarchy and dynamic work conditions such as the upper and lower dies Offset Displacement during the shearing-cut and bending process and the sheet springback during the process. It is thus capable of planning the work conditions of every workstation of the shearing-cut and bending progressive die. These conditions include: strip message communication through various workstations, the communication of the compensator message for the upper and lower die Offset Displacement and the communication of sheet springback. The model can distinctively express the design of supporting theories and the planning of information communication during the machining process.
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Analysis of a torque equilibrium model and the optimal strip working sequence for a shearing-cut and bending progressive die
Journal of Materials Processing Technology, 2001Co-Authors: Zone-ching Lin, Ching-hua DengAbstract:Abstract The shearing force in the shearing-cut process for a shearing-cut and bending progressive die is far greater than the strip bending force. In this paper, the equation for torque equilibrium is first established. The heuristic rule is then adopted to locate the die center of the shearing-cut and bending progressive die and an Offset Displacement is set (i.e. rough tuning). The algorithm of the static equilibrium is then used to conduct further fine-tuning of the die center to obtain the central pressure position of the shearing-cut and bending progressive die. The purpose is to reduce the time spent in adjusting the pressure center of the shearing-cut and bending progressive die. Finally, genetic-algorithms (GA) are applied as a solution tool in the analysis of the optimal strip working sequence possessing a smaller difference between the right and left torque in the shearing-cut and bending progressive die. This sequence can improve the approach of rough tuning by applying an Offset Displacement to the die center followed by further fine-tuning, as mentioned earlier. Instead, only fine-tuning of the die center is required to obtain the die’s central pressure with torque equilibrium for effective reduction of the time spent in adjusting the center of the shearing-cut and bending progressive die.
Zone-ching Lin - One of the best experts on this subject based on the ideXlab platform.
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Application of the torque equilibrium method in the study of Offset Displacement in the upper and lower dies in a shearing-cut progressive die
International Journal of Materials and Product Technology, 2001Co-Authors: Zone-ching Lin, Jenq-maw ChangAbstract:A shearing-cut progressive die is formed by arranging two or more sets of independent engineering dies in various engineering stations. The design of the shearing-cut progressive die involves a large number of variables. For example, the confirmation of the pressure centre of the shearing-cut progressive die is an issue worthy of exploration and evaluation. In this paper, we use the torque equilibrium method of the upper and lower dies of the shearing-cut progressive die along both sides of the centre axis to derive the pressure centre position of the shearing-cut progressive die. In the past, the search for the pressure centre of dies has not been analysed by more efficient methods. The designed die had to be adjusted step by step to derive the position closer to the pressure centre. Based on these disadvantages, we used the torque equilibrium method of the upper and lower dies along both sides of the centre axis in the search for the pressure centre. The Offset Displacement of upper and lower dies around the centre is applied to reduce the torque difference on both sides, which further reduces the arrangement time of the upper and lower dies and increases the design capabilities of the shearing-cut progressive die.
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Application of Petri Net in the planning of a shearing-cut and bending progressive die workstation
International Journal of Materials and Product Technology, 2001Co-Authors: Zone-ching Lin, Ching-hua DengAbstract:The method for analysing the strip workstation of shearing-cut and bending progressive dies is studied. First, the Petri Net model is used to construct the work conditions and synthesizing method of each workstation of the shearing-cut and bending progressive die. The model is able to clearly represent the systems hierarchy and dynamic work conditions such as the upper and lower dies Offset Displacement during the shearing-cut and bending process and the sheet springback during the process. It is thus capable of planning the work conditions of every workstation of the shearing-cut and bending progressive die. These conditions include: strip message communication through various workstations, the communication of the compensator message for the upper and lower die Offset Displacement and the communication of sheet springback. The model can distinctively express the design of supporting theories and the planning of information communication during the machining process.
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Analysis of a torque equilibrium model and the optimal strip working sequence for a shearing-cut and bending progressive die
Journal of Materials Processing Technology, 2001Co-Authors: Zone-ching Lin, Ching-hua DengAbstract:Abstract The shearing force in the shearing-cut process for a shearing-cut and bending progressive die is far greater than the strip bending force. In this paper, the equation for torque equilibrium is first established. The heuristic rule is then adopted to locate the die center of the shearing-cut and bending progressive die and an Offset Displacement is set (i.e. rough tuning). The algorithm of the static equilibrium is then used to conduct further fine-tuning of the die center to obtain the central pressure position of the shearing-cut and bending progressive die. The purpose is to reduce the time spent in adjusting the pressure center of the shearing-cut and bending progressive die. Finally, genetic-algorithms (GA) are applied as a solution tool in the analysis of the optimal strip working sequence possessing a smaller difference between the right and left torque in the shearing-cut and bending progressive die. This sequence can improve the approach of rough tuning by applying an Offset Displacement to the die center followed by further fine-tuning, as mentioned earlier. Instead, only fine-tuning of the die center is required to obtain the die’s central pressure with torque equilibrium for effective reduction of the time spent in adjusting the center of the shearing-cut and bending progressive die.
Athanasia Erkeki - One of the best experts on this subject based on the ideXlab platform.
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synergy of tectonic geomorphology applied geophysics and remote sensing techniques reveals new data for active extensional tectonism in nw peloponnese greece
Geomorphology, 2015Co-Authors: I Fountoulis, Emmanuel Vassilakis, Spyridon Mavroulis, J Alexopoulos, S Dilalos, Athanasia ErkekiAbstract:Abstract In tectonically active areas, such as in the northwest Peloponnese of western Greece, geomorphic processes are strongly influenced by active faulting; in many cases such faults cannot be easily identified. In this paper we apply multidisciplinary analysis (morphotectonic indices, neotectonic mapping, geophysical surveys and remote sensing techniques) to map the recently-recognized east–west trending Pineios River normal fault zone with a high degree of accuracy, and to better understand its contribution to the evolution of the ancient region of Elis during Holocene time. Fault activity seems to be related to frequent changes in river flow patterns and to Displacements of the nearby shoreline. We argue that fault activity is the main reason for migration of Pineios river mouth as documented for several time periods during historical time. Quantitative constraints on deformation caused by the faulting were applied through the application of the morphotectonic indices proposed in this paper, including drainage network asymmetry and sinuosity, and mountain front sinuosity, all of which indicate that this is a highly active structure. Slip rates calculated to be as high as 0.48 mm/yr for the last 209 ka (based on previously published dating) were verified by applied geophysical methods. The fault surface discontinuity was identified at depth using vertical electrical resistivity measurements and depositional layers of different resistivity were found to be clearly Offset. Displacement increases toward the west, reaching an observed maximum of 110 m. The most spectacular landform alteration due to surface deformation is the north–south migration of the river estuary into completely different open sea areas during the late Quaternary, mainly during the Holocene. The sediment transport path has been altered several times due to these changes in river geometry with and the most recent seeming to have occurred almost 2000 years ago. The river estuary migrated to its contemporary position along the southern coast, settled on the hanging wall, inducing retrograding of the northern coast, and settled on the foot wall, with rates reaching the order of 0.52 m/yr, as concluded from historical and recently-acquired remote sensing data.
Maria Giuseppina Limongelli - One of the best experts on this subject based on the ideXlab platform.
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“Total Displacement of curved surface sliders under nonseismic and seismic actions: A parametric study”
Structural Control and Health Monitoring, 2017Co-Authors: Virginio Quaglini, Emanuele Gandelli, Paolo Dubini, Maria Giuseppina LimongelliAbstract:Summary The re-centring capability is recognized as a fundamental function of any effective isolation system, not only because it is associated to small or negligible deformation at the end of the earthquake but rather because it prevents Displacement build up that may limit the capability of the structure to withstand aftershocks and future earthquakes. The current Eurocode recommends to estimate the maximum total Displacement of the isolated system as the superposition of the nonseismic Offset Displacement resulting from permanent actions, long-term deformations and thermal movements of the structure, and of the amplified seismic Displacement induced by the design earthquake. For systems endowed with low re-centring capability, the estimation shall also account for the possible accrual of Displacements during the lifetime of the structure. However, the aforementioned criteria have never been evaluated for curved surface sliders, which are characterized by an inherent nonlinear behaviour. The study aims at giving more insight into the matter by conducting a parametric study based on one-directional nonlinear response time history analyses and considering a variety of seismic scenarios. The first part of the study investigates the effect of a nonseismic Displacement on the earthquake-induced Displacement and formulates a criterion to evaluate the capability of curved surface sliders to provide a seismic response independent of the Offset Displacement. The response of the isolation system to natural sequences of earthquakes, where the Offset Displacement is the residual Displacement from the previous shake, is addressed in the second part of the paper. The provisions of the Eurocode are eventually checked against the observed data.
Jie Zheng - One of the best experts on this subject based on the ideXlab platform.
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Investigation of a cascading core-Offset in-line fiber Mach-Zehnder interferometer for refractive index measurement
Advanced Sensor Systems and Applications X, 2020Co-Authors: Qingyu Zou, Haiyang Bao, Jie ZhengAbstract:A cascading core-Offset in-line fiber Mach-Zehnder interferometer (MZI) was proposed to improve the RI sensitivity and eliminate the cross sensitivity between RI and temperature. The sensor was fabricated by cascading a small core-Offset inline fiber MZI (the Offset Displacement is 6μm and interference arm length is 30mm) with a large core-Offset in-line fiber MZI (the Offset Displacement is 40μm and interference arm length is 30mm). By enlarging the Offset Displacement, the RI sensitivity was improved from -9.177 to 108.326nm/RIU. And the MZIs with two Offset Displacement offer interference dips with different RI response, by utilizing the interference dips, the simultaneously measurement can be realized to eliminate the cross sensitivity.
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study of a large lateral core Offset in line fiber modal interferometer for refractive index sensing
Optical Fiber Technology, 2019Co-Authors: Fangda Yu, Jie ZhengAbstract:Abstract A large lateral core-Offset in-line fiber modal interferometer was proposed in order to avoid the relative direction of the two core-Offset joints affecting the interference performance. The RI sensing performances of the interferometers with different arm lengths were evaluated and compared with the small core-Offset ones. The simulation and experimental results showed that the power remaining in the core mode decreased from 25 to 0.002% after the input light passing through the first core-Offset joint as the core-Offset Displacement increased from 6 to 40 μm. Thus, the interference between the core mode and cladding mode within the enlarged core-Offset interferometer was suppressed, and meanwhile the interference within the cladding modes was dominated. As the core-Offset Displacement was simply enlarged from 6 to 40 μm, the RI sensitivity was greatly improved from 43.97 to 123.40 nm/RIU. The proposed sensor is a cost-effective solution for RI sensing purpose, and exhibits the advantages of high sensitivity, simple structure and easy fabrication with only a fusion splicer.
