The Experts below are selected from a list of 30798 Experts worldwide ranked by ideXlab platform

Hou Xinyi - One of the best experts on this subject based on the ideXlab platform.

  • The first Collision Point position identification method in vehicle–pedestrian impact accident
    International Journal of Crashworthiness, 2011
    Co-Authors: Zhang Xiaoyun, Jin Xianlong, Chai Xianghai, Hou Xinyi
    Abstract:

    Vehicle–pedestrian accidents share high frequency of occurrence in fatal traffic accidents in China. According to the Chinese Traffic Safety Regulations, the first Collision Point is the key factor for responsibility cognisance in related traffic accidents. Usually, the police or other accident investigators determine the first Collision Point position between vehicle and pedestrian only through experience. The position error of the Collision Point will lead to inaccurate accident analysis and responsibility judgement. This paper applies computer-simulated reconstruction in vehicle–pedestrian accident investigation and uses optimisation methods to analyse the simulation result. The first Collision Point position coordinates are set as variables of the optimisation objective function. Through optimisation analysis, first Collision Point position coordinates can be obtained. And, the reliability of simulation result can be evaluated through the reliability analysis. By reconstructing a real-world vehicle–pe...

  • the first Collision Point position identification method in vehicle pedestrian impact accident
    International Journal of Crashworthiness, 2011
    Co-Authors: Zhang Xiaoyun, Jin Xianlong, Chai Xianghai, Hou Xinyi
    Abstract:

    Vehicle–pedestrian accidents share high frequency of occurrence in fatal traffic accidents in China. According to the Chinese Traffic Safety Regulations, the first Collision Point is the key factor for responsibility cognisance in related traffic accidents. Usually, the police or other accident investigators determine the first Collision Point position between vehicle and pedestrian only through experience. The position error of the Collision Point will lead to inaccurate accident analysis and responsibility judgement. This paper applies computer-simulated reconstruction in vehicle–pedestrian accident investigation and uses optimisation methods to analyse the simulation result. The first Collision Point position coordinates are set as variables of the optimisation objective function. Through optimisation analysis, first Collision Point position coordinates can be obtained. And, the reliability of simulation result can be evaluated through the reliability analysis. By reconstructing a real-world vehicle–pe...

Marcel Placidi - One of the best experts on this subject based on the ideXlab platform.

  • The PEP-N interaction region
    Proceedings of the IEEE Particle Accelerator Conference, 2001
    Co-Authors: M. Sullivan, U. Wienands, John T. Seeman, M E Biagini, Marcel Placidi
    Abstract:

    The PEP-N project consists of a small, very low-energy e- storage ring (VLER) located in one of the interaction-straight regions of PEP-II. The small ring is brought into Collision with the low-energy (3.1 GeV) e+ beam (LER). The center-of-mass energies from this Collision are between the φ and J/ψ resonances. We achieve a head-on Collision through the use of a central magnetic dipole field that generates a large horizontal bending field. This field is also the central field of the detector. The large energy range of the VLER, in order to maximize the center-of-mass energy range, complicates the Collision Point geometry. In order to maintain the beam orbits near the Collision Point two techniques are used. The first is to scale the central dipole field up and down with the energy of the VLER and the second is to use passive shielding to decrease the integral B·dl of the dipole field seen by the VLER. Changes in the orbit of the LER are corrected with local bending magnets. Further details of the interaction region geometry as well as design issues that include synchrotron radiation from the high-current positron beam are discussed.

Masaki Okada - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Gap Length on Collision Angle and Collision Point Velocity of Magnetic Pressure Seam Welding
    Materials Science Forum, 2013
    Co-Authors: Makoto Miyazaki, Kuniaki Sasaki, Masaki Okada
    Abstract:

    Magnetic pressure seam welding is a Collision welding process, similar to explosive welding, utilizing electromagnetic force as the acceleration mechanism. True metallic bonding is achieved at the mating interface if contact takes place above an appropriate Collision Point velocity and Collision angle. This paper deals with dynamic deformation process on magnetic pressure seam welding of aluminum sheets. Numerical analysis of the dynamic deformation process of the metal sheets is made by a finite element method. In this analysis, the metal sheets (100 mm width, 1 mm thickness) are assumed to be composed of plane-strain quadrilateral elements. The result shows that when the gap length becomes narrow, Collision Point velocity was decreased early. When the gap length becomes narrow, Collision angle was increased slowly.

  • Simulation of Collision behavior on magnetic pressure seam welding of aluminum sheets
    Journal of Japan Institute of Light Metals, 2011
    Co-Authors: Makoto Miyazaki, Kuniaki Sasaki, Masaki Okada
    Abstract:

    This paper deals with dynamic deformation process on magnetic pressure seam welding of aluminum sheets. Numerical analysis of the dynamic deformation process of the aluminum sheets is made by a finite element method. In this analysis, the metal sheets (100 mm width, 1 mm thickness) are modeled with plane-strain quadrilateral elements. A Collision Point velocity between the aluminum sheet surfaces was very high at an initial Collision Point, but it decreased continuously during the welding. A Collision angle between the aluminum sheet surfaces was 0 degree at an initial Collision Point, but it increased continuously during the welding. The Collision angle in a double-sided magnetic pressure seam welding process increased more quickly than that in a single-sided magnetic pressure seam welding process.

Makoto Miyazaki - One of the best experts on this subject based on the ideXlab platform.

  • Collision Behavior in various Magnetic Pressure Seam Welding of Aluminum Sheets
    The International Journal of Multiphysics, 2019
    Co-Authors: A Hatta, Makoto Miyazaki, K Kajiro
    Abstract:

    Magnetic pressure seam welding attracts attention as a new welding method. Magnetic pressure seam welding is a Collision welding process, similar to explosive welding, utilizing electromagnetic force as the acceleration mechanism. This paper deals with dynamic deformation behavior on magnetic pressure seam welding and parallel seam welding of aluminum sheets. Numerical analysis of the dynamic deformation process of the aluminum sheets is made by a finite element method. In this analysis, the aluminum sheets is assumed to be a thin plate made of aluminum (A1050-H24, width 100mm, thickness 1mm) and composed of quadrilateral elements of plane strain. As a result, it was found that the maximum value of the Collision velocity was proportional to the discharge energy. It was also found that the smaller the gap, the faster the Collision Point moving speed. And the analysis from the initial Collision Point to the outside was similar to that of the single coil.

  • Influence of Gap Length on Collision Angle and Collision Point Velocity of Magnetic Pressure Seam Welding
    Materials Science Forum, 2013
    Co-Authors: Makoto Miyazaki, Kuniaki Sasaki, Masaki Okada
    Abstract:

    Magnetic pressure seam welding is a Collision welding process, similar to explosive welding, utilizing electromagnetic force as the acceleration mechanism. True metallic bonding is achieved at the mating interface if contact takes place above an appropriate Collision Point velocity and Collision angle. This paper deals with dynamic deformation process on magnetic pressure seam welding of aluminum sheets. Numerical analysis of the dynamic deformation process of the metal sheets is made by a finite element method. In this analysis, the metal sheets (100 mm width, 1 mm thickness) are assumed to be composed of plane-strain quadrilateral elements. The result shows that when the gap length becomes narrow, Collision Point velocity was decreased early. When the gap length becomes narrow, Collision angle was increased slowly.

  • Simulation of Collision behavior on magnetic pressure seam welding of aluminum sheets
    Journal of Japan Institute of Light Metals, 2011
    Co-Authors: Makoto Miyazaki, Kuniaki Sasaki, Masaki Okada
    Abstract:

    This paper deals with dynamic deformation process on magnetic pressure seam welding of aluminum sheets. Numerical analysis of the dynamic deformation process of the aluminum sheets is made by a finite element method. In this analysis, the metal sheets (100 mm width, 1 mm thickness) are modeled with plane-strain quadrilateral elements. A Collision Point velocity between the aluminum sheet surfaces was very high at an initial Collision Point, but it decreased continuously during the welding. A Collision angle between the aluminum sheet surfaces was 0 degree at an initial Collision Point, but it increased continuously during the welding. The Collision angle in a double-sided magnetic pressure seam welding process increased more quickly than that in a single-sided magnetic pressure seam welding process.

H.l. Heaton - One of the best experts on this subject based on the ideXlab platform.