The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform

P Maurine - One of the best experts on this subject based on the ideXlab platform.

  • a systematic analytical method for pkm Stiffness Matrix calculation
    International Conference on Robotics and Automation, 2006
    Co-Authors: D Deblaise, X Hernot, P Maurine
    Abstract:

    The purpose of this work is to propose a new approach for the calculation of PKM Stiffness Matrix by using an analytical method based on Matrix structural analysis. This method has as the main advantage to be systematic and it also can be applied to hyper-static PKM Stiffness analysis. The implementation of the proposed method is fast and convenient and it can easily be involved during PKM design optimization. Moreover, as the Stiffness Matrix is obtained in a close form, it can be implemented directly on the robot controller. In other words, the proposed method could be used to reduce the gap existing between actual PKM and those that have to meet the high accuracy specifications required for machining applications. At first this paper presents the proposed analytical method that is applied to calculate the Stiffness Matrix of a delta parallel structure. Then the experimental results that have been done to evaluate and validate its efficiency are presented

  • ICRA - A systematic analytical method for PKM Stiffness Matrix calculation
    Proceedings 2006 IEEE International Conference on Robotics and Automation 2006. ICRA 2006., 1
    Co-Authors: D Deblaise, X Hernot, P Maurine
    Abstract:

    The purpose of this work is to propose a new approach for the calculation of PKM Stiffness Matrix by using an analytical method based on Matrix structural analysis. This method has as the main advantage to be systematic and it also can be applied to hyper-static PKM Stiffness analysis. The implementation of the proposed method is fast and convenient and it can easily be involved during PKM design optimization. Moreover, as the Stiffness Matrix is obtained in a close form, it can be implemented directly on the robot controller. In other words, the proposed method could be used to reduce the gap existing between actual PKM and those that have to meet the high accuracy specifications required for machining applications. At first this paper presents the proposed analytical method that is applied to calculate the Stiffness Matrix of a delta parallel structure. Then the experimental results that have been done to evaluate and validate its efficiency are presented

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

  • a systematic analytical method for pkm Stiffness Matrix calculation
    International Conference on Robotics and Automation, 2006
    Co-Authors: D Deblaise, X Hernot, P Maurine
    Abstract:

    The purpose of this work is to propose a new approach for the calculation of PKM Stiffness Matrix by using an analytical method based on Matrix structural analysis. This method has as the main advantage to be systematic and it also can be applied to hyper-static PKM Stiffness analysis. The implementation of the proposed method is fast and convenient and it can easily be involved during PKM design optimization. Moreover, as the Stiffness Matrix is obtained in a close form, it can be implemented directly on the robot controller. In other words, the proposed method could be used to reduce the gap existing between actual PKM and those that have to meet the high accuracy specifications required for machining applications. At first this paper presents the proposed analytical method that is applied to calculate the Stiffness Matrix of a delta parallel structure. Then the experimental results that have been done to evaluate and validate its efficiency are presented

  • ICRA - A systematic analytical method for PKM Stiffness Matrix calculation
    Proceedings 2006 IEEE International Conference on Robotics and Automation 2006. ICRA 2006., 1
    Co-Authors: D Deblaise, X Hernot, P Maurine
    Abstract:

    The purpose of this work is to propose a new approach for the calculation of PKM Stiffness Matrix by using an analytical method based on Matrix structural analysis. This method has as the main advantage to be systematic and it also can be applied to hyper-static PKM Stiffness analysis. The implementation of the proposed method is fast and convenient and it can easily be involved during PKM design optimization. Moreover, as the Stiffness Matrix is obtained in a close form, it can be implemented directly on the robot controller. In other words, the proposed method could be used to reduce the gap existing between actual PKM and those that have to meet the high accuracy specifications required for machining applications. At first this paper presents the proposed analytical method that is applied to calculate the Stiffness Matrix of a delta parallel structure. Then the experimental results that have been done to evaluate and validate its efficiency are presented

Marek-jerzy Pindera - One of the best experts on this subject based on the ideXlab platform.

  • Local/global Stiffness Matrix formulation for composite materials and structures
    Composites Engineering, 1991
    Co-Authors: Marek-jerzy Pindera
    Abstract:

    Abstract An efficient algorithm is outlined for solving boundary-value problems involving laminated composite materials and structures that require satisfaction of both continuity of tractions and displacements along common interfaces. The method is based on the systematic construction of a global Stiffness Matrix for the entire laminated structure in terms of local Stiffness matrices of the individual layers. The local Stiffness Matrix relates the traction components at the upper and lower (or inner and outer) surface of a given layer to the corresponding displacements. The assembly of local Stiffness matrices into a global Stiffness Matrix is carried out by enforcing continuity conditions along the interfaces which, in effect, leads to reformulation of the problem in terms of interfacial displacements as the basic unknown variables. This, in turn, results in the elimination of certain redundant continuity conditions and thus reduction in the number of simultaneous algebraic equations that need to be solved. An additional advantage of the local/global Stiffness Matrix formulation is the ease with which certain mixed boundary-value problems can be reduced to singular integral equations of the Fredholm type for the determination of unknown quantities such as the contact pressure in the case of contact problems and the crack-opening displacement in the case of interfacial crack problems.

  • local global Stiffness Matrix formulation for composite materials and structures
    Composites Engineering, 1991
    Co-Authors: Marek-jerzy Pindera
    Abstract:

    Abstract An efficient algorithm is outlined for solving boundary-value problems involving laminated composite materials and structures that require satisfaction of both continuity of tractions and displacements along common interfaces. The method is based on the systematic construction of a global Stiffness Matrix for the entire laminated structure in terms of local Stiffness matrices of the individual layers. The local Stiffness Matrix relates the traction components at the upper and lower (or inner and outer) surface of a given layer to the corresponding displacements. The assembly of local Stiffness matrices into a global Stiffness Matrix is carried out by enforcing continuity conditions along the interfaces which, in effect, leads to reformulation of the problem in terms of interfacial displacements as the basic unknown variables. This, in turn, results in the elimination of certain redundant continuity conditions and thus reduction in the number of simultaneous algebraic equations that need to be solved. An additional advantage of the local/global Stiffness Matrix formulation is the ease with which certain mixed boundary-value problems can be reduced to singular integral equations of the Fredholm type for the determination of unknown quantities such as the contact pressure in the case of contact problems and the crack-opening displacement in the case of interfacial crack problems.

X Hernot - One of the best experts on this subject based on the ideXlab platform.

  • a systematic analytical method for pkm Stiffness Matrix calculation
    International Conference on Robotics and Automation, 2006
    Co-Authors: D Deblaise, X Hernot, P Maurine
    Abstract:

    The purpose of this work is to propose a new approach for the calculation of PKM Stiffness Matrix by using an analytical method based on Matrix structural analysis. This method has as the main advantage to be systematic and it also can be applied to hyper-static PKM Stiffness analysis. The implementation of the proposed method is fast and convenient and it can easily be involved during PKM design optimization. Moreover, as the Stiffness Matrix is obtained in a close form, it can be implemented directly on the robot controller. In other words, the proposed method could be used to reduce the gap existing between actual PKM and those that have to meet the high accuracy specifications required for machining applications. At first this paper presents the proposed analytical method that is applied to calculate the Stiffness Matrix of a delta parallel structure. Then the experimental results that have been done to evaluate and validate its efficiency are presented

  • ICRA - A systematic analytical method for PKM Stiffness Matrix calculation
    Proceedings 2006 IEEE International Conference on Robotics and Automation 2006. ICRA 2006., 1
    Co-Authors: D Deblaise, X Hernot, P Maurine
    Abstract:

    The purpose of this work is to propose a new approach for the calculation of PKM Stiffness Matrix by using an analytical method based on Matrix structural analysis. This method has as the main advantage to be systematic and it also can be applied to hyper-static PKM Stiffness analysis. The implementation of the proposed method is fast and convenient and it can easily be involved during PKM design optimization. Moreover, as the Stiffness Matrix is obtained in a close form, it can be implemented directly on the robot controller. In other words, the proposed method could be used to reduce the gap existing between actual PKM and those that have to meet the high accuracy specifications required for machining applications. At first this paper presents the proposed analytical method that is applied to calculate the Stiffness Matrix of a delta parallel structure. Then the experimental results that have been done to evaluate and validate its efficiency are presented

Jeffrey P Laible - One of the best experts on this subject based on the ideXlab platform.

  • measurement of a spinal motion segment Stiffness Matrix
    Journal of Biomechanics, 2002
    Co-Authors: Ian A F Stokes, Mack Gardnermorse, David L Churchill, Jeffrey P Laible
    Abstract:

    The six-degrees-of-freedom elastic behavior of spinal motion segments can be approximated by a Stiffness Matrix. A method is described to measure this Stiffness Matrix directly with the motion segment held under physiological conditions of axial preload and in an isotonic fluid bath by measuring the forces and moments associated with each of the six orthogonal translations and rotations. The Stiffness Matrix was obtained from the load-displacement measurements by linear least squares assuming a symmetric Matrix. Results from a pig lumbar spinal motion segment in an isotonic bath, with and without a 500 N axial preload, showed a large stiffening effect with axial preload.

  • Technical note Measurement of a spinal motion segment Stiffness Matrix
    2002
    Co-Authors: Ian A F Stokes, David L Churchill, Mack Gardner-morse, Jeffrey P Laible
    Abstract:

    The six-degrees-of-freedom elastic behavior of spinal motion segments can be approximated by a Stiffness Matrix. Amethod is described to measure this Stiffness Matrix directly with the motion segment held under physiological conditions of axial preload and in an isotonic fluid bath by measuring the forces and moments associated with each of the six orthogonal translations and rotations. The Stiffness Matrix was obtained from the load–displacement measurements by linear least squares assuming a symmetric Matrix. Results from a pig lumbar spinal motion segment in an isotonic bath, with and without a 500 N axial preload, showed a large stiffening effect with axial preload. r 2002 Elsevier Science Ltd. All rights reserved.