The Experts below are selected from a list of 14220 Experts worldwide ranked by ideXlab platform
Masanori Kunieda - One of the best experts on this subject based on the ideXlab platform.
-
Study on Electromagnetic Force during Wire-EDM
Journal of The Japan Society for Precision Engineering, 2020Co-Authors: Shunsuke Tomura, Masanori KuniedaAbstract:This paper clarifies the mechanism of the Electromagnetic Force applied to the wire electrode in wire-EDM. The distribution of the magnetic flux density caused by the steady current was analyzed using finite element method (FEM) to calculate the Electromagnetic Force. The Electromagnetic Force theoretically obtained was used for analysis of the wire vibration under two kinds of current waveforms: single long current pulse and consecutive short current pulses. From the comparison of wire vibrations obtained from the experiment and analysis, it was found that the Electromagnetic Force is caused by both DC and AC components of the discharge current. When the workpiece is ferromagnetic, the Electromagnetic Force caused by DC component of the discharge current is dominant, and it is an attractive Force. When the workpiece is paramagnetic, the Electromagnetic Force caused by DC component of the discharge current is insignificant compared with the Force caused by AC components due to Electromagnetic induction.
-
Influences of Electromagnetic Force Acting on Wire Electrode during Wire-EDM
Journal of The Japan Society for Precision Engineering, 2020Co-Authors: Shunsuke Tomura, Masanori KuniedaAbstract:This paper compares the magnitude of the Electromagnetic Force applied to the wire electrode during wire electrical discharge machining (WEDM) with those of other Forces: electrostatic Force and discharge reaction Force. Both the Electromagnetic Force and electrostatic Force were analytically obtained and found to be in agreement with those obtained from experiments. Then the discharge reaction Force was determined by solving the inverse problem where the discharge reaction Force was modified until the measured wire vibration agreed with that calculated using the above mentioned Electromagnetic and electrostatic Forces. It was found that the influence of the Electromagnetic Force on the wire movement is not negligibly small under rough cutting conditions, especially with higher discharge frequency and larger workpiece thickness.
-
analysis of Electromagnetic Force in wire edm
Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology, 2009Co-Authors: Shunsuke Tomura, Masanori KuniedaAbstract:This paper clarifies the mechanism of how Electromagnetic Force applied to the wire electrode in wire electrical discharge machining (wire-EDM) is generated. This Electromagnetic Force is caused not only by DC component but also by AC components of the discharge current supplied to the wire. We therefore developed and used a two-dimensional finite element method (FEM) program to analyze the Electromagnetic field taking into account Electromagnetic induction. Assuming that trapezoidal pulse current is supplied to the wire, distributions of the current density and magnetic flux density were analyzed and changes in the Electromagnetic Force applied to the wire were calculated. Wire movement when the Electromagnetic Force alone was applied to the wire was also calculated. The calculated wire movement agreed with the measured wire movement when pulse current actually used in WEDM was supplied to the wire, clarifying the mechanism of Electromagnetic Force generation.
Shunsuke Tomura - One of the best experts on this subject based on the ideXlab platform.
-
Study on Electromagnetic Force during Wire-EDM
Journal of The Japan Society for Precision Engineering, 2020Co-Authors: Shunsuke Tomura, Masanori KuniedaAbstract:This paper clarifies the mechanism of the Electromagnetic Force applied to the wire electrode in wire-EDM. The distribution of the magnetic flux density caused by the steady current was analyzed using finite element method (FEM) to calculate the Electromagnetic Force. The Electromagnetic Force theoretically obtained was used for analysis of the wire vibration under two kinds of current waveforms: single long current pulse and consecutive short current pulses. From the comparison of wire vibrations obtained from the experiment and analysis, it was found that the Electromagnetic Force is caused by both DC and AC components of the discharge current. When the workpiece is ferromagnetic, the Electromagnetic Force caused by DC component of the discharge current is dominant, and it is an attractive Force. When the workpiece is paramagnetic, the Electromagnetic Force caused by DC component of the discharge current is insignificant compared with the Force caused by AC components due to Electromagnetic induction.
-
Influences of Electromagnetic Force Acting on Wire Electrode during Wire-EDM
Journal of The Japan Society for Precision Engineering, 2020Co-Authors: Shunsuke Tomura, Masanori KuniedaAbstract:This paper compares the magnitude of the Electromagnetic Force applied to the wire electrode during wire electrical discharge machining (WEDM) with those of other Forces: electrostatic Force and discharge reaction Force. Both the Electromagnetic Force and electrostatic Force were analytically obtained and found to be in agreement with those obtained from experiments. Then the discharge reaction Force was determined by solving the inverse problem where the discharge reaction Force was modified until the measured wire vibration agreed with that calculated using the above mentioned Electromagnetic and electrostatic Forces. It was found that the influence of the Electromagnetic Force on the wire movement is not negligibly small under rough cutting conditions, especially with higher discharge frequency and larger workpiece thickness.
-
analysis of Electromagnetic Force in wire edm
Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology, 2009Co-Authors: Shunsuke Tomura, Masanori KuniedaAbstract:This paper clarifies the mechanism of how Electromagnetic Force applied to the wire electrode in wire electrical discharge machining (wire-EDM) is generated. This Electromagnetic Force is caused not only by DC component but also by AC components of the discharge current supplied to the wire. We therefore developed and used a two-dimensional finite element method (FEM) program to analyze the Electromagnetic field taking into account Electromagnetic induction. Assuming that trapezoidal pulse current is supplied to the wire, distributions of the current density and magnetic flux density were analyzed and changes in the Electromagnetic Force applied to the wire were calculated. Wire movement when the Electromagnetic Force alone was applied to the wire was also calculated. The calculated wire movement agreed with the measured wire movement when pulse current actually used in WEDM was supplied to the wire, clarifying the mechanism of Electromagnetic Force generation.
D. Spałek - One of the best experts on this subject based on the ideXlab platform.
-
Theorem of Electromagnetic Force surface representation in anisotropic region
Technical Physics, 2020Co-Authors: D. SpałekAbstract:The paper deals with the problem of surface-integral representation of an Electromagnetic Force in anisotropic region. The Electromagnetic Force calculated by means of Maxwell's and Lorentz's methods could lead to different results for some anisotropic media. The theorem of surface-integral representation of Lorentz's Force in Electromagnetic field is formulated. Examples of analytical calculations of Forces for both the isotropic and anisotropic media in Electromagnetic field are provided.
-
Two theorems about Electromagnetic Force in activate anisotropic regions
The XIX International Conference on Electrical Machines - ICEM 2010, 2010Co-Authors: D. SpałekAbstract:The paper has dealt with two problems of calculation of Electromagnetic Force/torque. The first one is for magnetically anisotropic and conductive region. It has been presented sufficient condition for surface-integral representation of Electromagnetic Force/torque in conductive and anisotropic region. The second approach deals with the problem of independence of Force/torque calculated value from shape of integral-surface. The second theorem gives the sufficient condition for this independence for Maxwell stress tensor method is applied.
-
Anisotropy component of Electromagnetic Force and torque
Bulletin of The Polish Academy of Sciences-technical Sciences, 2010Co-Authors: D. SpałekAbstract:The paper deals with the problem of surface-integral representation of Electromagnetic Force/torque for magnetically anisotropic region. It is pointed out that in some anisotropic regions a component of Electromagnetic Force/torque appears the so-called anisotropy component. The total Electromagnetic field Force/torque calculated with the help of Maxwell’s and Lorentz’s methods could lead to the different values for some anisotropic medium (homogeneous, without hysteresis). The coenergy method is used to evaluate total Force/torque too. Analytical calculations of Force/torque for isotropic and anisotropic media in Electromagnetic field are presented. The condition for surface integral representation of Lorentz’s either Force or torque is formulated.
Songcen Wang - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of Electromagnetic Force on Metal Objects in Vertical Direction of Wireless Power Transfer
2019 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW), 2019Co-Authors: Xian Zhang, Xuejing Ni, Qingxin Yang, Songcen WangAbstract:The interaction between the space coupled magnetic field and the moving charge will inevitably cause the metal foreign objects entering the wireless power transfer (WPT) system to be affected by the Electromagnetic Force. Metal objects will produce a certain trajectory under the Force, which poses a serious threat to the safe operation of the system. At the same time, it also brings a difficult problem to foreign object detection technology. This paper analyses the characteristics of Electromagnetic Force on metal objects in vertical direction of WPT system. Firstly, the analytical computational models of ferromagnetic and non-ferromagnetic foreign objects subjected to Electromagnetic Force are obtained and investigated. Then, the interactive effects of conductivity and permeability of metal foreign objects on Electromagnetic Force are explored and verified by simulation and experiment. This research is benefit for the operation safety and reliability of WPT system.
-
Research on the Influence of Structural Parameters on Electromagnetic Force of Wireless Power Transfer
2018 IEEE 2nd International Electrical and Energy Conference (CIEEC), 2018Co-Authors: Xian Zhang, Xuejing Ni, Qingxin Yang, Songcen Wang, Xiaokang WuAbstract:Due to the existence of inductive current and time-varying Electromagnetic field in high power wireless power transfer (WPT) system, the coupling mechanism inevitably be affected by Electromagnetic Force, which has negative effects on the stability and the life of the system. The Electromagnetic Force of different structural systems is varied, due to the change of magnetic field. In this paper, the numerical solution of the Electromagnetic Force of the WPT system is presented based on Lorentz-Kelvin Force density method. Then, an equivalent finite element model is built to study the influence of structural parameters on the Electromagnetic Force by parameterized solution, and the effects of magnetic permeability, coil turns and turn spacing on Electromagnetic Force are obtained, respectively. The laws are helpful for the design and the optimization of the WPT system.
Yuan-wen Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Collective trajectory planning for satellite swarm using inter-satellite Electromagnetic Force
Acta Astronautica, 2014Co-Authors: Huan Huang, Le-ping Yang, Yuan-wen ZhangAbstract:Abstract The inter-satellite Electromagnetic Force presents several significant advantages that help to expand its space applications to the multi-satellite missions gradually. For a satellite swarm, whether the Electromagnetic Force is applied to enable collective maneuver and how to provide a better performance and broader applications for such swarm highlight an important issue. Considering the trajectory planning problem of satellite swarm using inter-satellite Electromagnetic Force, a behavior-based collective planning scheme is developed by designing the desired velocity of each satellite as the sum of several different behavioral contributions, which are used to represent the internal and external interactions of the swarm. Therefore, the desired configuration is associated with the equilibrium points of the pre-designed kinematical field. Furthermore, the trajectory planning problem could be translated to a parameter optimization problem considering the swarm dynamics with inter-satellite Electromagnetic Force. Then based on the analysis of the applicability and advantages triggered by integrating the inter-satellite Electromagnetic Force into such behavior-based planning scheme, the collective trajectory planning problem with sole Electromagnetic Force actuation and hybrid actuation with thruster are studied respectively. Numerical simulations are carried out to verify the validity of the proposed algorithm, and the satellite swarm performance enhanced by inter-satellite Electromagnetic Force is discussed at last.
-
Formation keeping control through inter-satellite Electromagnetic Force
Science China-technological Sciences, 2013Co-Authors: Le-ping Yang, Yuan-wen ZhangAbstract:Satellite formation keeping through inter-satellite Electromagnetic Force provides an attractive alternative for future space missions due to its distinct advantages of no propellant consumption or plume contamination as compared to conventional approaches. However, the internal Force nature as well as the high nonlinearity and coupling of Electromagnetic Force brings new control challenges for this novel technique. In this paper, analysis on the dynamics characteristics and special control issues in the presence of Electromagnetic Force is carried out on the basis of the derived relatively translational dynamics. Considering the model uncertainties, external disturbances and sensor noise, a combined nonlinear control scheme involving feed-forward and feedback control components is proposed for Electromagnetic-Force-based formation keeping. The feed-forward component is directly obtained through desired configuration and dynamics under nominal conditions while the feedback component is realized utilizing active disturbance rejection control methodology with some reasonable improvement. Numerical simulation is presented to verify the feasibility and validity of the combined control scheme.