Vibration

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Gábor Stépán - One of the best experts on this subject based on the ideXlab platform.

  • Chatter mitigation using the nonlinear tuned Vibration absorber
    International Journal of Non-linear Mechanics, 2017
    Co-Authors: Giuseppe Habib, Gaëtan Kerschen, Gábor Stépán
    Abstract:

    Abstract A passive Vibration absorber, termed the nonlinear tuned Vibration absorber (NLTVA), is designed for the suppression of chatter Vibrations. Unlike most passive Vibration absorbers proposed in the literature for suppressing machine tool Vibrations, the NLTVA comprises both a linear and a nonlinear restoring force. Its linear characteristics are tuned in order to optimize the stability properties of the machining operation, while its nonlinear properties are chosen in order to control the bifurcation behavior of the system and guarantee robustness of stable operation. In this study, the NLTVA is applied to turning machining.

Y. S. Tarng - One of the best experts on this subject based on the ideXlab platform.

  • design of a dynamic Vibration absorber against Vibrations in turning operations
    Journal of Materials Processing Technology, 2001
    Co-Authors: C Y Nian, Y. S. Tarng
    Abstract:

    Abstract A dynamic Vibration absorber is mounted on a cutting tool against Vibrations in turning operations. It is shown that the dynamic Vibration absorber can reduce the magnitude of the frequency response function of the cutting tool. As a result, Vibrations can be effectively suppressed in the cutting process when the dynamic Vibration absorber is attached to the cutting tool. Experimental results performed in turning operations are presented to illustrate this approach.

Giuseppe Habib - One of the best experts on this subject based on the ideXlab platform.

  • Chatter mitigation using the nonlinear tuned Vibration absorber
    International Journal of Non-linear Mechanics, 2017
    Co-Authors: Giuseppe Habib, Gaëtan Kerschen, Gábor Stépán
    Abstract:

    Abstract A passive Vibration absorber, termed the nonlinear tuned Vibration absorber (NLTVA), is designed for the suppression of chatter Vibrations. Unlike most passive Vibration absorbers proposed in the literature for suppressing machine tool Vibrations, the NLTVA comprises both a linear and a nonlinear restoring force. Its linear characteristics are tuned in order to optimize the stability properties of the machining operation, while its nonlinear properties are chosen in order to control the bifurcation behavior of the system and guarantee robustness of stable operation. In this study, the NLTVA is applied to turning machining.

Toshiji Mukai - One of the best experts on this subject based on the ideXlab platform.

  • grain refinement of az91 alloy by introducing ultrasonic Vibration during solidification
    Materials Letters, 2008
    Co-Authors: Yoshiaki Osawa, Susumu Takamori, Toshiji Mukai
    Abstract:

    Ultrasonic Vibration was introduced into the solidification of AZ91 alloy. Various microstructures were produced in this alloy using ultrasonic Vibrations at different temperatures of the melt. The coarse dendrite microstructures were obtained with ultrasonic Vibrations at temperatures below the liquidus temperature. The fine uniform grains were achieved under ultrasonic Vibrations during the nucleation stage, which was mainly attributed to the cavitation and the acoustic flow induced by the ultrasonic Vibration.

Wramne Lina - One of the best experts on this subject based on the ideXlab platform.

  • Dual-mass flywheels with tuned Vibration absorbers for application in heavy-duty truck powertrains
    2020
    Co-Authors: Wramne Lina
    Abstract:

    As the heavy-duty combustion engine development goes towards lower rotational speeds and higher cylinder pressures, the torsional Vibrations increase. There is therefore a need to identify and study new types of Vibration absorbers that can reduce the level of torsional Vibrations transmitted from the engine to the gearbox. In this work, the concept of a dual-mass flywheel combined with a tuned Vibration absorber is analysed. The tuned Vibration absorber efficiently reduces the Vibration amplitudes for engine load frequencies near the tuning frequency, but it also introduces an additional resonance into the system. By placing the tuned Vibration absorber on an intermediate flange between the two dual-mass flywheels, the introduced resonance frequency will be lower than the tuning frequency and a resonance in operating engine speed range can be avoided. Numerical simulations are used to show how the torsional Vibration amplitudes in a heavy-duty truck powertrain are affected by the tuned Vibration absorber and how the different parameters of the tuned Vibration absorber and the dual-mass flywheel affect the torsional Vibrations and the resonance frequencies

  • Analysis of power split Vibration absorber performance in heavy-duty truck powertrains
    2020
    Co-Authors: Wramne Lina
    Abstract:

    The current development of more efficient combustion engines leads to an increase in engine torsional Vibrations; therefore, new technology is needed for reducing the Vibrations transmitted from the engine to the driveline. In this article, the concept of power split Vibration absorber is evaluated. A mathematical model of the power split Vibration absorber is presented, and an analytical study shows how different design parameters affect the power split Vibration absorber performance. Numerical simulations with models representing typical heavy-duty truck powertrains are used in the evaluations. It is concluded that for a low level of damping, the power split Vibration absorber can provide significantly lower Vibration amplitudes than a corresponding dual mass flywheel within a limited speed range. If the power split Vibration absorber is optimised for the critical low engine speeds, an overall decrease in the level of Vibration can be obtained, but a larger installation space than with a conventional dual mass flywheel would probably be required