The Experts below are selected from a list of 32955 Experts worldwide ranked by ideXlab platform
F. Jovane - One of the best experts on this subject based on the ideXlab platform.
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Towards Virtual Engineering in Machine Tool Design
CIRP Annals - Manufacturing Technology, 1996Co-Authors: G. Bianchi, P. Van Den Braembussche, Hendrik Van Brussel, Francesco Paolucci, F. JovaneAbstract:an integrated modeling technique for high speed machine Tool Design is proposed. The model contains a description of the structure, derived from a Finite Element/Model via modal reduction, compliant guideways with static and dynamic friction, and a continuous or discrete time controller. This modeling Tool permits Designers to evaluate, during the first stages of Design, how the mechanical structure and control contribute to the dynamic behavior of the machine, estimating, for example, the dynamic compliance at the Tool, the lost motion due to friction and the tracking error during acceleration. © 1996 CIRP.
Wilsun Xu - One of the best experts on this subject based on the ideXlab platform.
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Downhole Tool Design for Conditional Monitoring of Electrical Submersible Motors in Oil Field Facilities
IEEE Transactions on Industry Applications, 2017Co-Authors: Xiaodong Liang, Omid Ghoreishi, Wilsun XuAbstract:The electrical submersible pump (ESP) systems rely on downhole Tools to monitor the operation of electrical submersible motors and pumps. The monitored parameters include temperature and vibration of the motor, and the pump intake pressure. Transmitting these parameters successfully and reliably through a downhole Tool from downhole to surface under various ESP system operating conditions is critical for production optimization and equipment safety. In this paper, a new downhole Tool Design method using a phase-to-neutral communication scheme is proposed, which can overcome issues of current downhole Tool products installed in the field. In this Design, an effective signal communication path is formed by external impedance on the wellhead connecting one phase to the ground combined with a controlled thyristor at downhole connecting the neutral of an electrical submersible motor to the ground. Extensive analytical calculation and PSCAD simulation of the proposed method are demonstrated in the paper. Two case studies are conducted using a real ESP system under normal and single-line-to-ground fault conditions. A sensitivity study is performed to evaluate the influence of various factors on the signal strength for signal communication purpose. A lab testing further provides proof of concept. The proposed method in this paper will result in a reliable and effective downhole Tool Design for an ESP system operation.
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phase to phase communication scheme for downhole monitoring Tool Design in electrical submersible pump systems
IEEE Transactions on Industry Applications, 2016Co-Authors: Omid Ghoreishi, Xiaodong Liang, Wilsun XuAbstract:Electrical submersible pumps (ESPs) are commonly used artificial lift method in deep wells in oil industry. To monitor ESP systems operation, downhole monitoring Tools are used to transmit data representing the physical condition of the downhole such as temperature, pressure, and vibration to the surface. The most common communication method for downhole monitoring Tools in the field is to use a direct current (dc) signal over three phases of the main power cable, and the ground serves as a return path. However, this method cannot operate in the event of a single-line-to-ground (SLG) fault, although the ESP is still in operation due to ungrounded practice in its downhole zone. This method is also prone to failure in the presence of voltage unbalance. To overcome issues in the existing downhole monitoring Tool Design, a new phase-to-phase communication scheme is proposed in this paper. Intentional disturbances are applied to the ESP system and used as means of binary communication. In this paper, theoretical formulas of the proposed method are derived, and its performance is evaluated using simulation through case and sensitivity studies.
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phase to phase communication scheme for downhole monitoring Tool Design in electrical submersible pump systems
IEEE Industry Applications Society Annual Meeting, 2015Co-Authors: Omid Ghoreishi, Xiaodong Liang, Wilsun XuAbstract:Electrical Submersible Pumps (ESPs) are commonly used in deep wells in oil and gas industry. In order to monitor ESP systems operating conditions, downhole monitoring Tools are used to transmit data representing physical conditions of downhole such as temperature, pressure, and vibration to the surface. The most common downhole communication method implemented in the field is to use a DC signal over three phases of the main power cable and uses the ground as a return path. However, this method cannot operate in the event of a single-phase-to-ground fault, because the signal path would be shorted although the electrical submersible pump is still in operation due to the ungrounding practice in downhole ESP systems. Experience has also shown that this existing method is prone to failure in presence of unbalance conditions in the system. In this paper, a new phase-to-phase communication scheme for the downhole monitoring Tool Design is proposed where intentional disturbances in the power supply to the motor are used as means of binary communication. The proposed scheme is immune to single-phase-to-ground faults and unbalance conditions. Theoretical formulas defining this method are developed and the performance of the method is evaluated using simulation through case and sensitivity studies.
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Downhole monitoring Tool Design using power line disturbances
2015 IEEE IAS 51st Industrial & Commercial Power Systems Technical Conference (I&CPS), 2015Co-Authors: Xiaodong Liang, Wilsun XuAbstract:The downhole monitoring Tool is a critical component in electrical submersible pump (ESP) wells to monitor downhole parameters such as the pump intake pressure, the temperature of motor winding and oil reservoir, the motor vibration etc. to ensure proper ESP system operation and to optimize production. In this paper, a downhole monitoring Tool Design method is proposed using power line disturbances. This method is based on the technology of two-way automatic communication system (TWACS). The AC current signal is used for the downhole Tool. This new Design scheme utilizes an external impedance connecting one phase of the ESP system to the ground on the wellhead, and a controlled thyrsitor connected between the neutral of the ESP motor and the ground by conducting at a specific firing angle and cycles. This Design can overcome the impact of single-line-to-ground faults of the ESP system on the communication of downhole Tools. The Design method is verified through the simulation using PSCAD by case and sensitivity studies. The lab testing is conducted to further validate the effectiveness of the proposed Design method.
S.e. Tabatabaie - One of the best experts on this subject based on the ideXlab platform.
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An enhanced methodical approach to machine Tool Design procedure
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2008Co-Authors: Mohammad Javad Nategh, S.e. TabatabaieAbstract:The Designers' heuristic approach has been the subject of research, with a view to developing algorithms that can be used in automated Design systems. However, apart from some general achievements, viable results are not sufficiently available to be employed in machine Tool Design procedures. The existing algorithms suffer serious deficiencies, restraining their viable use. In pursuit of a total solution, the current authors have proposed an enhanced methodology on the basis of a weighted priority system that can be used for various steps of machine Tool Design practice and competitiveness evaluation procedure. The core idea of this methodology is based on prioritization of Design factors. The weighted priority orders of input information and the degree and intensity of connectivity existing between input information and Design factors are used to decide the priorities of Design factors. This methodical approach can assist in developing consistency among the Designers throughout Design procedures, improving competence of young engineers, and developing total solutions and CAD programs. Its applications have been illustrated by examples of layout, assembly, and component Design for machining centres and lathes.
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An enhanced methodical approach to machine Tool Design procedure
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2008Co-Authors: Mohammad Javad Nategh, S.e. TabatabaieAbstract:The Designers' heuristic approach has been the subject of research, with a view to developing algorithms that can be used in automated Design systems. However, apart from some general achievements, viable results are not sufficiently available to be employed in machine Tool Design procedures. The existing algorithms suffer serious deficiencies, restraining their viable use. In pursuit of a total solution, the current authors have proposed an enhanced methodology on the basis of a weighted priority system that can be used for various steps of machine Tool Design practice and competitiveness evaluation procedure. The core idea of this methodology is based on prioritization of Design factors. The weighted priority orders of input information and the degree and intensity of connectivity existing between input information and Design factors are used to decide the priorities of Design factors. This methodical approach can assist in developing consistency among the Designers throughout Design procedures, improving competence of young engineers, and developing total solutions and CAD programs. Its applications have been illustrated by examples of layout, assembly, and component Design for machining centres and lathes. ? IMechE 2008.
G. Bianchi - One of the best experts on this subject based on the ideXlab platform.
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Towards Virtual Engineering in Machine Tool Design
CIRP Annals - Manufacturing Technology, 1996Co-Authors: G. Bianchi, P. Van Den Braembussche, Hendrik Van Brussel, Francesco Paolucci, F. JovaneAbstract:an integrated modeling technique for high speed machine Tool Design is proposed. The model contains a description of the structure, derived from a Finite Element/Model via modal reduction, compliant guideways with static and dynamic friction, and a continuous or discrete time controller. This modeling Tool permits Designers to evaluate, during the first stages of Design, how the mechanical structure and control contribute to the dynamic behavior of the machine, estimating, for example, the dynamic compliance at the Tool, the lost motion due to friction and the tracking error during acceleration. © 1996 CIRP.
L.w. Hourng - One of the best experts on this subject based on the ideXlab platform.
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Two-dimensional two-phase numerical model for Tool Design in electrochemical machining
Journal of Applied Electrochemistry, 2001Co-Authors: C.s. Chang, L.w. HourngAbstract:Tool Design in electrochemical machining is investigated including the effects of thermal-fluid properties of the electrolyte. A two-dimensional two-phase numerical model is used to predict the thermal-fluid field. Simulation indicates that, as the curvature of the electrode shape varies widely, the two-dimensional phenomenon of the flow is apparent and the two-dimensional model should be used during the numerical simulation. In addition, a higher electrolyte flow rate slightly reduces the two-dimensional effects. As the curvature of the electrode shape varies only slightly, one-dimensional analysis is accurate and capable of reducing the calculation time.
