The Experts below are selected from a list of 9099 Experts worldwide ranked by ideXlab platform

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

  • stability analysis of a rotor bearing system due to surface waviness and number of balls
    International Journal of Mechanical Sciences, 2004
    Co-Authors: Suraj P. Harsha, P K Kankar
    Abstract:

    Abstract In the paper, the stability analysis of a rigid rotor supported by ball bearings has been studied. In the analytical formulation, the contacts between balls and races are considered as nonlinear springs, whose stiffnesses are obtained by using Hertzian elastic contact deformation theory. The implicit type numerical integration technique Newmark-β with Newton–Raphson method is used to solve the nonlinear differential equations iteratively. The effects of surface waviness and the varying number of balls on stability of rotor bearing system are observed. All results presented in form of Fast Fourier Transformations show that the vibration characteristics of the rotor and its bearings change, when the bearings operate in different regions of their nonlinear load deflection characteristics. From the analysis, it is implied that the number of balls and number of waves in the ball bearing are two important governing parameters affecting its dynamic behavior.

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

  • The Effect of Surface Waviness and Number of Rolling Elements on the Dynamic Behavior of a Rotor-Bearing System
    Volume 1: 21st Biennial Conference on Mechanical Vibration and Noise Parts A B and C, 2007
    Co-Authors: Suraj P. Harsha, C. Nataraj
    Abstract:

    In the paper, the effects of the number of rolling elements and wave number of surface waviness on the nonlinear dynamic analysis of a rotor-bearing system has been studied. In the analytical formulation, the contacts between rolling elements and races are considered as nonlinear springs, whose stiffnesses are obtained by using Hertzian elastic contact deformation theory. The results are presented in the form of Fast Fourier Transformations (FFT) and Poincare maps, which show that the vibration characteristics of the rotor and its bearings change when the bearings operate in different regions of their nonlinear load deflection characteristics. The appearance of regions of periodic, sub-harmonic and chaotic behavior has been observed to be strongly dependent on number of rolling elements.Copyright © 2007 by ASME

  • stability analysis of a rotor bearing system due to surface waviness and number of balls
    International Journal of Mechanical Sciences, 2004
    Co-Authors: Suraj P. Harsha, P K Kankar
    Abstract:

    Abstract In the paper, the stability analysis of a rigid rotor supported by ball bearings has been studied. In the analytical formulation, the contacts between balls and races are considered as nonlinear springs, whose stiffnesses are obtained by using Hertzian elastic contact deformation theory. The implicit type numerical integration technique Newmark-β with Newton–Raphson method is used to solve the nonlinear differential equations iteratively. The effects of surface waviness and the varying number of balls on stability of rotor bearing system are observed. All results presented in form of Fast Fourier Transformations show that the vibration characteristics of the rotor and its bearings change, when the bearings operate in different regions of their nonlinear load deflection characteristics. From the analysis, it is implied that the number of balls and number of waves in the ball bearing are two important governing parameters affecting its dynamic behavior.

Christian Plessl - One of the best experts on this subject based on the ideXlab platform.

  • Efficient Ab-Initio Molecular Dynamic Simulations by Offloading Fast Fourier Transformations to FPGAs
    arXiv: Distributed Parallel and Cluster Computing, 2020
    Co-Authors: Arjun Ramaswami, Tobias Kenter, Thomas D. Kühne, Christian Plessl
    Abstract:

    A large share of today's HPC workloads is used for Ab-Initio Molecular Dynamics (AIMD) simulations, where the interatomic forces are computed on-the-fly by means of accurate electronic structure calculations. They are computationally intensive and thus constitute an interesting application class for energy-efficient hardware accelerators such as FPGAs. In this paper, we investigate the potential of offloading 3D Fast Fourier Transformations (FFTs) as a critical routine of plane-wave-based electronic structure calculations to FPGA and in conjunction demonstrate the tolerance of these simulations to lower precision computations.

  • FPL - Efficient Ab-Initio Molecular Dynamic Simulations by Offloading Fast Fourier Transformations to FPGAs
    2020 30th International Conference on Field-Programmable Logic and Applications (FPL), 2020
    Co-Authors: Arjun Ramaswami, Tobias Kenter, Thomas D. Kühne, Christian Plessl
    Abstract:

    A large share of today's HPC workloads is used for Ab-Initio Molecular Dynamics (AIMD) simulations, where the interatomic forces are computed on-the-fly by means of accurate electronic structure calculations. They are computationally intensive and thus constitute an interesting application class for energy-efficient hardware accelerators such as FPGAs. In this paper, we investigate the potential of offloading 3D Fast Fourier Transformations (FFTs) as a critical routine of plane-wave-based electronic structure calculations to FPGA and in conjunction demonstrate the tolerance of these simulations to lower precision computations.

Arjun Ramaswami - One of the best experts on this subject based on the ideXlab platform.

  • Efficient Ab-Initio Molecular Dynamic Simulations by Offloading Fast Fourier Transformations to FPGAs
    arXiv: Distributed Parallel and Cluster Computing, 2020
    Co-Authors: Arjun Ramaswami, Tobias Kenter, Thomas D. Kühne, Christian Plessl
    Abstract:

    A large share of today's HPC workloads is used for Ab-Initio Molecular Dynamics (AIMD) simulations, where the interatomic forces are computed on-the-fly by means of accurate electronic structure calculations. They are computationally intensive and thus constitute an interesting application class for energy-efficient hardware accelerators such as FPGAs. In this paper, we investigate the potential of offloading 3D Fast Fourier Transformations (FFTs) as a critical routine of plane-wave-based electronic structure calculations to FPGA and in conjunction demonstrate the tolerance of these simulations to lower precision computations.

  • FPL - Efficient Ab-Initio Molecular Dynamic Simulations by Offloading Fast Fourier Transformations to FPGAs
    2020 30th International Conference on Field-Programmable Logic and Applications (FPL), 2020
    Co-Authors: Arjun Ramaswami, Tobias Kenter, Thomas D. Kühne, Christian Plessl
    Abstract:

    A large share of today's HPC workloads is used for Ab-Initio Molecular Dynamics (AIMD) simulations, where the interatomic forces are computed on-the-fly by means of accurate electronic structure calculations. They are computationally intensive and thus constitute an interesting application class for energy-efficient hardware accelerators such as FPGAs. In this paper, we investigate the potential of offloading 3D Fast Fourier Transformations (FFTs) as a critical routine of plane-wave-based electronic structure calculations to FPGA and in conjunction demonstrate the tolerance of these simulations to lower precision computations.

C. Nataraj - One of the best experts on this subject based on the ideXlab platform.

  • The Effect of Surface Waviness and Number of Rolling Elements on the Dynamic Behavior of a Rotor-Bearing System
    Volume 1: 21st Biennial Conference on Mechanical Vibration and Noise Parts A B and C, 2007
    Co-Authors: Suraj P. Harsha, C. Nataraj
    Abstract:

    In the paper, the effects of the number of rolling elements and wave number of surface waviness on the nonlinear dynamic analysis of a rotor-bearing system has been studied. In the analytical formulation, the contacts between rolling elements and races are considered as nonlinear springs, whose stiffnesses are obtained by using Hertzian elastic contact deformation theory. The results are presented in the form of Fast Fourier Transformations (FFT) and Poincare maps, which show that the vibration characteristics of the rotor and its bearings change when the bearings operate in different regions of their nonlinear load deflection characteristics. The appearance of regions of periodic, sub-harmonic and chaotic behavior has been observed to be strongly dependent on number of rolling elements.Copyright © 2007 by ASME