The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Shaoru Zhang - One of the best experts on this subject based on the ideXlab platform.
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control of rotor Radial Displacement for bearingless induction motors
Conference on Industrial Electronics and Applications, 2012Co-Authors: He Chen, Shaoru Zhang, Ruiye ZhangAbstract:It is the focus of the research on the bearingless motors to suspend the rotor stably by controlling rotor Radial Displacement. Without studying the relationship between the Radial suspension force and rotor Radial Displacement, traditional control method for rotor Radial Displacement has some drawbacks such as the complexity of computation and the time-consuming tuning. In order to overcome these drawbacks, a new approach to control the rotor Radial Displacement was proposed based on the relationship between the rotor Radial Displacement and Radial suspension force. The airgap flux orientation is adopted to decouple the electromagnetic torque and Radial suspension force. This approach directly controls the rotor Radial Displacement of bearingless induction motors. In addition, a control system was designed by applying this approach. The simulation results show that the proposed control strategy is effective in improving the static and dynamic performance of stable suspension of bearingless motors. In addition, the proposed approach realizes direct control for rotor Radial Displacement of the bearingless induction motor.
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direct control of Radial Displacement for bearingless permanent magnet type synchronous motors
IEEE Transactions on Industrial Electronics, 2009Co-Authors: Shaoru ZhangAbstract:In recent years, research has been focused on bearingless motors to suspend the rotor stably by controlling rotor Radial Displacement. Without studying the relationship between the Radial suspension force and Radial Displacement, the traditional control method for rotor Radial Displacement has some drawbacks such as the complexity of computation and time-consuming tuning. In order to overcome these drawbacks, a novel approach to control the rotor Radial Displacement was proposed based on the relationship between the Radial Displacement and Radial suspension force. The rotor flux orientation is adopted to decouple the electromagnetic torque and Radial suspension force. This approach directly controls the rotor Radial Displacement of bearingless permanent-magnet-type synchronous motors. In addition, a control system was designed by applying this approach. The simulation and experimental results show that the proposed control strategy is effective in realizing stable operation in rotor Radial position control.
Shaoxian Bing - One of the best experts on this subject based on the ideXlab platform.
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estimation of the water oil relative permeability curve from Radial Displacement experiments part 1 numerical inversion method
Energy & Fuels, 2012Co-Authors: Daigang Wang, Zhenquan Li, Shaoxian BingAbstract:The water–oil relative permeability curve is mainly obtained from linear Displacement experiments. Few Radial Displacement experiments have been carried out. In the process of linear Displacement experiments, the flow properties of the water–oil two phase are linear. Nevertheless, it is Radial near the bottom holes of an actual reservoir. With regard to both kinds of Displacement experiments, the flow characteristics are various, which may result in great deviation to apply the linear calculation theory of the relative permeability curve to an actual reservoir. As a result of the above-mentioned problems, on the basis of Radial Displacement experiments, using the Levenberg–Marquardt algorithm for automatic history matching, this paper performs optimization of production performance and relative permeability representation models. Finally, a novel numerical inversion method for the Radial water–oil relative permeability curve is established. A test based on the basic data of a Radial laboratory displacemen...
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Estimation of the Water–Oil Relative Permeability Curve from Radial Displacement Experiments. Part 1: Numerical Inversion Method
Energy & Fuels, 2012Co-Authors: Daigang Wang, Zhenquan Li, Shaoxian BingAbstract:The water–oil relative permeability curve is mainly obtained from linear Displacement experiments. Few Radial Displacement experiments have been carried out. In the process of linear Displacement experiments, the flow properties of the water–oil two phase are linear. Nevertheless, it is Radial near the bottom holes of an actual reservoir. With regard to both kinds of Displacement experiments, the flow characteristics are various, which may result in great deviation to apply the linear calculation theory of the relative permeability curve to an actual reservoir. As a result of the above-mentioned problems, on the basis of Radial Displacement experiments, using the Levenberg–Marquardt algorithm for automatic history matching, this paper performs optimization of production performance and relative permeability representation models. Finally, a novel numerical inversion method for the Radial water–oil relative permeability curve is established. A test based on the basic data of a Radial laboratory displacemen...
Ruiye Zhang - One of the best experts on this subject based on the ideXlab platform.
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control of rotor Radial Displacement for bearingless induction motors
Conference on Industrial Electronics and Applications, 2012Co-Authors: He Chen, Shaoru Zhang, Ruiye ZhangAbstract:It is the focus of the research on the bearingless motors to suspend the rotor stably by controlling rotor Radial Displacement. Without studying the relationship between the Radial suspension force and rotor Radial Displacement, traditional control method for rotor Radial Displacement has some drawbacks such as the complexity of computation and the time-consuming tuning. In order to overcome these drawbacks, a new approach to control the rotor Radial Displacement was proposed based on the relationship between the rotor Radial Displacement and Radial suspension force. The airgap flux orientation is adopted to decouple the electromagnetic torque and Radial suspension force. This approach directly controls the rotor Radial Displacement of bearingless induction motors. In addition, a control system was designed by applying this approach. The simulation results show that the proposed control strategy is effective in improving the static and dynamic performance of stable suspension of bearingless motors. In addition, the proposed approach realizes direct control for rotor Radial Displacement of the bearingless induction motor.
Zhan Liao - One of the best experts on this subject based on the ideXlab platform.
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rupture of posterior cruciate ligament leads to Radial Displacement of the medial meniscus
BMC Musculoskeletal Disorders, 2017Co-Authors: Can Zhang, Zhenhan Deng, Wenfeng Xiao, Yihe Hu, Zhan Liao, Kanghua Li, Hongbo HeAbstract:Abstract Background To explore the association between the rupture of posterior cruciate ligament (PCL) and the Radial Displacement of medial meniscus under the conditions of different flexion and various axial loads. Methods The Radial Displacement value of medial meniscus was measured for the specimens of normal adult knee joints, including 12 intact PCLs, 6 ruptures of the anterolateral bundle (ALB), 6 ruptures of the postmedial bundle (PMB), and 12 complete ruptures. The measurement was conducted at 0°, 30°, 60°, and 90° of knee flexion angles under 200 N, 400 N, 600 N, 800 N and 1000 N of axial loads respectively. Results The Displacement values of medial meniscus of the ALB rupture group increased at 0° flexion under 800 N and 1000 N, and at 30°, 60° and 90° flexion under all loads in comparison with the PCL intact group. The Displacement values of the PMB rupture group was higher at 0° and 90° flexion under all loads, and at 30° and 60° flexion under 800 N and 1000 N loads. The Displacement of the PCL complete rupture group increased at all flexion angles under all loads. Conclusions Either partial or complete rupture of the PCL can increase in the Radial Displacement of the medial meniscus, which may explain the degenerative changes that occuring in the medial meniscus due to PCL injury. Therefore, early reestablishment of the PCL is necessarily required in order to maintain stability of the knee joint after PCL injury.
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effect of posterior cruciate ligament rupture on the Radial Displacement of lateral meniscus
Clinical Biomechanics, 2015Co-Authors: Yihe Hu, Kanghua Li, Zhan LiaoAbstract:Abstract Background The relationship between lateral meniscus tear and posterior cruciate ligament injury is not well understood. The present study aims to investigate and assess the effect of posterior cruciate ligament rupture on lateral meniscus Radial Displacement at different flexion angles under static loading conditions. Methods Twelve fresh human cadaveric knee specimens were divided into four groups such as posterior cruciate ligament intact, anterolateral band rupture, posteromedial band rupture and posterior cruciate ligament complete rupture groups, according to the purpose and order of testing. Radial Displacement of lateral meniscus was measured under different loads (200–1000 N) at 0°, 30°, 60°, and 90° of knee flexion. Findings Compared with posterior cruciate ligament intact group, the Displacement values of lateral meniscus in anterolateral band rupture group increased at 0° flexion with 600 N, 800 N, and 1000 N and at 30°, 60° and 90° flexion under all loading conditions. Posteromedial band rupture group exhibited higher Displacement at 0° flexion under all loading conditions, at 30° and 60° flexion with 600, 800 N and 1000 N, and at 90° flexion with 400 N, 600 N, 800 N, and 1000 N than the posterior cruciate ligament intact group. The posterior cruciate ligament complete rupture group had a higher Displacement value of lateral medial meniscus at 0°, 30°, 60° and 90° flexion under all loading conditions, as compared to the posterior cruciate ligament intact group. Interpretation The study concludes that partial and complete rupture of the posterior cruciate ligament can trigger the increase of Radial Displacement on lateral meniscus.
Daigang Wang - One of the best experts on this subject based on the ideXlab platform.
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estimation of the water oil relative permeability curve from Radial Displacement experiments part 1 numerical inversion method
Energy & Fuels, 2012Co-Authors: Daigang Wang, Zhenquan Li, Shaoxian BingAbstract:The water–oil relative permeability curve is mainly obtained from linear Displacement experiments. Few Radial Displacement experiments have been carried out. In the process of linear Displacement experiments, the flow properties of the water–oil two phase are linear. Nevertheless, it is Radial near the bottom holes of an actual reservoir. With regard to both kinds of Displacement experiments, the flow characteristics are various, which may result in great deviation to apply the linear calculation theory of the relative permeability curve to an actual reservoir. As a result of the above-mentioned problems, on the basis of Radial Displacement experiments, using the Levenberg–Marquardt algorithm for automatic history matching, this paper performs optimization of production performance and relative permeability representation models. Finally, a novel numerical inversion method for the Radial water–oil relative permeability curve is established. A test based on the basic data of a Radial laboratory displacemen...
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Estimation of the Water–Oil Relative Permeability Curve from Radial Displacement Experiments. Part 1: Numerical Inversion Method
Energy & Fuels, 2012Co-Authors: Daigang Wang, Zhenquan Li, Shaoxian BingAbstract:The water–oil relative permeability curve is mainly obtained from linear Displacement experiments. Few Radial Displacement experiments have been carried out. In the process of linear Displacement experiments, the flow properties of the water–oil two phase are linear. Nevertheless, it is Radial near the bottom holes of an actual reservoir. With regard to both kinds of Displacement experiments, the flow characteristics are various, which may result in great deviation to apply the linear calculation theory of the relative permeability curve to an actual reservoir. As a result of the above-mentioned problems, on the basis of Radial Displacement experiments, using the Levenberg–Marquardt algorithm for automatic history matching, this paper performs optimization of production performance and relative permeability representation models. Finally, a novel numerical inversion method for the Radial water–oil relative permeability curve is established. A test based on the basic data of a Radial laboratory displacemen...
