The Experts below are selected from a list of 15717 Experts worldwide ranked by ideXlab platform

Shaohui Peng - One of the best experts on this subject based on the ideXlab platform.

  • sand layer collapse treatment an Engineering Example from qingdao metro subway tunnel
    Journal of Cleaner Production, 2018
    Co-Authors: Yuqing Wu, Kui Wang, Lianzhen Zhang, Shaohui Peng
    Abstract:

    Abstract In the construction process of shallow subway tunnels, frequent collapses of the sand layer overlying the tunnel pose a serious threat to the safety of the construction operation. With the big data monitoring information, more effective treatments can be applied for sand-layer collapse. Based on the Engineering background of the sand-layer collapse disaster in Qingdao Metro Line 2, detailed analysis of the process and mechanism of sand-layer collapse in tunnels was done. Grouting method was used to improve collapse-preventing treatment in the sand layer. For treating the water-bearing sand layer above the tunnel, an advancement of grouting reinforcement system was proposed. The results showed that the main causes of sand-layer collapse are the intrinsic characteristics of the sand layer itself. The cohesive soil content of the sand layer is low and the cementation ability of the sand layer is weak. The advancing grouting method applied in this project is an effective method to strengthen the sand layer; the grouting parameters obtained in this study can be used as a guidance for similar Engineering projects.

D Müller - One of the best experts on this subject based on the ideXlab platform.

  • Thin layers in electrical Engineering. Example of shell models in analysing eddy-currents by boundary and finite element methods
    IEEE Transactions on Magnetics, 1993
    Co-Authors: Laurent Krähenbühl, D Müller
    Abstract:

    During last years, several numerical formulations have been developed by us to model physical problems such as: conducting film effects on the surface of insulators(pollution) [1], high frequency eddy-currents [2], earth field effects on the hull of a ship [3].The physical effects are completely different, but in each of these Examples, they originate from a region thin relative to the other geometrical dimensions. An efficient numerical approach consists of using a surface representation with special boundary conditions expressing the solution inside the thin region.We propose in this paper a didactical approach to thin regions in electromagnetics and, as an Example, the boundary conditions and surface equation for eddy currents flowing inside a thin ferromagnetic shell. The numerical tests are done using the BEM software package PHI3D, but the results could easily be transposed in a FEM context.The practical applications may concern the computation of losses (shield of electrical machines or transformers) or low frequency electromagnetic perturbations (screen effects, EMC) as well as special applications like optimisation of the induction heating of pans (French art culinaire).

  • Thin layers in electrical Engineering-Example of shell models in analysing eddy-currents by boundary and finite element methods
    IEEE Transactions on Magnetics, 1993
    Co-Authors: Laurent Krähenbühl, D Müller
    Abstract:

    The authors propose a didactical approach to thin regions in electromagnetics and, as an Example, derive the boundary conditions and surface equation for eddy currents flowing inside a thin ferromagnetic shell. The numerical tests are done using the boundary-element-method (BEM) software package PH13-D, but the results could easily be transposed in a finite-element-method (FEM) context. The practical applications my concern the computation of losses (shield of electrical machines or transformers) or low-frequency electromagnetic perturbations (screen effects, electromagnetic compatibility) as well as special applications such as the optimization of the induction heating of pans.

  • thin layers in electrical Engineering Example of shell models in analysing eddy currents by boundary and finite element methods
    IEEE Conference on Electromagnetic Field Computation, 1992
    Co-Authors: Laurent Krähenbühl, D Müller
    Abstract:

    During last years, several numerical formulations have been developed by us to modelize physical problems like: conducting film effects over the surface of insulators (pollution) [1], high frequency eddy-currents [2], earth field effects on the hull of a ship [3]. The physical effects being at stake are completely different, but in each of these Examples, they originate from a region thin in regard with the other geometrical dimensions. An efficient numerical approach consists on using a surfacic representation with special boundary conditions expressing the solution inside the thin region. We propose in that paper a didactical approach to thin regions in electromanetics and, as an Example, the boundary conditions and surfacic equation for eddy currents flowing inside a thin ferromagnetic shell. The numerical tests are done using the BEM software PH13D, but the results could easily be transposed in a FEM context. The practical applications may concern the computation of losses (shield of electrical machines or transformers) or low frequency electromagnetic perturbations (screen effects, EMC) as well as special domains like optimization of the induction heating of pans (french art culinaire).

  • Thin Layers in Electrical Engineering. Example of Shell models in Analysing Eddy-Currents by Boundary and Finite Element Methods
    Digest of the Fifth Biennial IEEE Conference on Electromagnetic Field Computation, 1992
    Co-Authors: Laurent Krähenbühl, D Müller
    Abstract:

    Summary from only given, as follows. During last years, several numerical formulations have been developed by us to modelize physical problems like: conducting film effects over the surface of insulators (pollution) [1], high frequency eddy-currents [2], earth field effects on the hull of a ship [3]. The physical effects being at stake are completely different, but in each of these Examples, they originate from a region thin in regard with the other geometrical dimensions. An efficient numerical approach consists on using a surfacic representation with special boundary conditions expressing the solution inside the thin region. We propose in that paper a didactical approach to thin regions in electromanetics and, as an Example, the boundary conditions and surfacic equation for eddy currents flowing inside a thin ferromagnetic shell. The numerical tests are done using the BEM software PH13D, but the results could easily be transposed in a FEM context. The practical applications may concern the computation of losses (shield of electrical machines or transformers) or low frequency electromagnetic perturbations (screen effects, EMC) as well as special domains like optimization of the induction heating of pans (french art culinaire).

K.n. Otto - One of the best experts on this subject based on the ideXlab platform.

  • A tool for imprecise calculations in Engineering systems
    Proceedings of 1995 IEEE International Conference on Fuzzy Systems., 1995
    Co-Authors: J.e. Chen, K.n. Otto
    Abstract:

    This paper outlines a method for propagating imprecise constraints in Engineering design. An interactive CAD tool implementation is described. To enable rapid propagation, we develop an extension of the level interval algorithm capable of handling arbitrary nonlinear constraints, and implement it in the CAD tool. A simple Engineering Example is illustrated.

Yuqing Wu - One of the best experts on this subject based on the ideXlab platform.

  • sand layer collapse treatment an Engineering Example from qingdao metro subway tunnel
    Journal of Cleaner Production, 2018
    Co-Authors: Yuqing Wu, Kui Wang, Lianzhen Zhang, Shaohui Peng
    Abstract:

    Abstract In the construction process of shallow subway tunnels, frequent collapses of the sand layer overlying the tunnel pose a serious threat to the safety of the construction operation. With the big data monitoring information, more effective treatments can be applied for sand-layer collapse. Based on the Engineering background of the sand-layer collapse disaster in Qingdao Metro Line 2, detailed analysis of the process and mechanism of sand-layer collapse in tunnels was done. Grouting method was used to improve collapse-preventing treatment in the sand layer. For treating the water-bearing sand layer above the tunnel, an advancement of grouting reinforcement system was proposed. The results showed that the main causes of sand-layer collapse are the intrinsic characteristics of the sand layer itself. The cohesive soil content of the sand layer is low and the cementation ability of the sand layer is weak. The advancing grouting method applied in this project is an effective method to strengthen the sand layer; the grouting parameters obtained in this study can be used as a guidance for similar Engineering projects.

Laurent Krähenbühl - One of the best experts on this subject based on the ideXlab platform.

  • Thin layers in electrical Engineering. Example of shell models in analysing eddy-currents by boundary and finite element methods
    IEEE Transactions on Magnetics, 1993
    Co-Authors: Laurent Krähenbühl, D Müller
    Abstract:

    During last years, several numerical formulations have been developed by us to model physical problems such as: conducting film effects on the surface of insulators(pollution) [1], high frequency eddy-currents [2], earth field effects on the hull of a ship [3].The physical effects are completely different, but in each of these Examples, they originate from a region thin relative to the other geometrical dimensions. An efficient numerical approach consists of using a surface representation with special boundary conditions expressing the solution inside the thin region.We propose in this paper a didactical approach to thin regions in electromagnetics and, as an Example, the boundary conditions and surface equation for eddy currents flowing inside a thin ferromagnetic shell. The numerical tests are done using the BEM software package PHI3D, but the results could easily be transposed in a FEM context.The practical applications may concern the computation of losses (shield of electrical machines or transformers) or low frequency electromagnetic perturbations (screen effects, EMC) as well as special applications like optimisation of the induction heating of pans (French art culinaire).

  • Thin layers in electrical Engineering-Example of shell models in analysing eddy-currents by boundary and finite element methods
    IEEE Transactions on Magnetics, 1993
    Co-Authors: Laurent Krähenbühl, D Müller
    Abstract:

    The authors propose a didactical approach to thin regions in electromagnetics and, as an Example, derive the boundary conditions and surface equation for eddy currents flowing inside a thin ferromagnetic shell. The numerical tests are done using the boundary-element-method (BEM) software package PH13-D, but the results could easily be transposed in a finite-element-method (FEM) context. The practical applications my concern the computation of losses (shield of electrical machines or transformers) or low-frequency electromagnetic perturbations (screen effects, electromagnetic compatibility) as well as special applications such as the optimization of the induction heating of pans.

  • thin layers in electrical Engineering Example of shell models in analysing eddy currents by boundary and finite element methods
    IEEE Conference on Electromagnetic Field Computation, 1992
    Co-Authors: Laurent Krähenbühl, D Müller
    Abstract:

    During last years, several numerical formulations have been developed by us to modelize physical problems like: conducting film effects over the surface of insulators (pollution) [1], high frequency eddy-currents [2], earth field effects on the hull of a ship [3]. The physical effects being at stake are completely different, but in each of these Examples, they originate from a region thin in regard with the other geometrical dimensions. An efficient numerical approach consists on using a surfacic representation with special boundary conditions expressing the solution inside the thin region. We propose in that paper a didactical approach to thin regions in electromanetics and, as an Example, the boundary conditions and surfacic equation for eddy currents flowing inside a thin ferromagnetic shell. The numerical tests are done using the BEM software PH13D, but the results could easily be transposed in a FEM context. The practical applications may concern the computation of losses (shield of electrical machines or transformers) or low frequency electromagnetic perturbations (screen effects, EMC) as well as special domains like optimization of the induction heating of pans (french art culinaire).

  • Thin Layers in Electrical Engineering. Example of Shell models in Analysing Eddy-Currents by Boundary and Finite Element Methods
    Digest of the Fifth Biennial IEEE Conference on Electromagnetic Field Computation, 1992
    Co-Authors: Laurent Krähenbühl, D Müller
    Abstract:

    Summary from only given, as follows. During last years, several numerical formulations have been developed by us to modelize physical problems like: conducting film effects over the surface of insulators (pollution) [1], high frequency eddy-currents [2], earth field effects on the hull of a ship [3]. The physical effects being at stake are completely different, but in each of these Examples, they originate from a region thin in regard with the other geometrical dimensions. An efficient numerical approach consists on using a surfacic representation with special boundary conditions expressing the solution inside the thin region. We propose in that paper a didactical approach to thin regions in electromanetics and, as an Example, the boundary conditions and surfacic equation for eddy currents flowing inside a thin ferromagnetic shell. The numerical tests are done using the BEM software PH13D, but the results could easily be transposed in a FEM context. The practical applications may concern the computation of losses (shield of electrical machines or transformers) or low frequency electromagnetic perturbations (screen effects, EMC) as well as special domains like optimization of the induction heating of pans (french art culinaire).