Selection of damping coefficient of simplified mount module to control transmissibility of environmental response under nobase mass-block

  • Authors

    • Gee Soo Lee
    • Moo Yeon Lee
    • Ki Hyun Kim
    • Chan Jung Kim
    2018-04-03
    https://doi.org/10.14419/ijet.v7i2.12.11114
  • Simplified Mount Module, Transmissibility Function, Acceleration Response, Emergency Electric Power Plant, Model of Mount Module
  • Background/Objectives: This paper focused on the simplified design of passive mount modulein electric power plants using only spring and damper elements.

    Methods/Statistical analysis: The selection of elements in a proposed simplified passive mount module was proceeded under the requirement, which is to show the response level same or less as compare to the case of current mount module. The response at the upper location of mount affect to negative effect on the responsible electric power plants so the design criterion should be satisfied with the newly proposed simple mount module.

    Findings: The frequency response function between the force and response acceleration at upper position of mount module was calculated from the theoretical mount module and the transmissibility function, between two response accelerations at two different passive mount modules, was evaluated for interesting harmonic frequencies (from 1X to 4X). The primary interesting frequency(X)was determined at 30(Hz) since the operation condition of the combustion engine in electric power plant is scheduled to be operated at constant 1,800(rev/min). Several simulation cases can be obtained for different combination of selected dampingcoefficients at the proposed mount module. The magnitude of transmissibility function should be less than one all interesting frequencies and the reasonable condition of the simple mount module can be derived from the simulation result.Then, the validation of the designed simplified mount module was conducted by preparing two kinds of mount module and the acceleration responses were measured at 1,800(rev/min) operation under 100% electric load. The spectral response at interesting frequencies confirms the superiority of the newly proposed mount module.

    Improvements/Applications: The simplified structure of mount module can be possible to save installation cost and time simultaneously and it is easy to conduct the maintenance of mount module.

     

     

  • References

    1. [1] Pingzhang Z, Jianbin D, Zhenhua L, Simultaneous topology optimization of supporting structure and loci of isolators in an active vibration isolation system. Computers & Structures, 2018, 194, pp.74-85.

      [2] Beijen M A, Tjepkema D, Dijk J, Two-sensor control in active vibration isolation using hard mounts. Control Engineering Practice, 2014, 26, pp.82-90.

      [3] Yang X L, Wu H T, Li Y, Chen B, Dynamic isotropic design and decentralized active control of a six-axis vibration isolator via Stewart platform. Mechanism and Machine Theory, 2017, 117, pp.244-252.

      [4] Wang Z, Mak C M, Application of a movable active vibration control system on a floating raft. Journal of Sound and Vibration, 2018, 414, pp.233-244.

      [5] Gu X, Yu Y, Li J, Li Y, Semi-active control of magnetorheological elastomer base isolation system utilizing learning-based inverse model. Journal of Sound and Vibration, 2017, 406, pp.346-362.

      [6] Santos M B, Coelho H T, Neto F P L, MafhoudJ, Assessment of semi-active friction dampers. Mechanical Systems and Signal Processing, 2017, 94, pp.33-56.

      [7] Oh, H U, Choi Y J, Enhancement of pointing performance by semi-active variable damping isolator with strategies for attenuating chattering effects. Sensors and Actuators A: Physical, 2011, 165, pp.385-391.

      [8] Azadi M, Behzadipour, Faulkner G, Performance analysis of a semi-active mount made by a new variable stiffness spring. Journal of Sound and Vibration, 2011, 330(12), pp.2733-2746.

      [9] Kim C J, Kang Y J, Lee B H, Ahn H J, Design sensitivity analysis of a system under intact conditions using measured response data, Journal of Sound and Vibration, 2011, 331(13), pp.3213-3226.

      [10] Keulen F, Haftka R T, Kim N H, Review of options for structural design sensitivity analysis. Part 1: Linear systems. Computer methods in applied mechanics and engineering, 2005, 194, pp.3213-3243.

      [11] Kim C J, Lee B H, Kang Y J, Ahn H J, Accuracy enhancement of fatigue damage counting using design sensitivity analysis. Journal of Sound and Vibration, 2014, 333(13), pp.2971-2982.

      [12] Kim C J, Design sensitivity analysis of a Stockbridge damper to control resonance frequencies. Journal of Mechanical Science and Technology, 2017, 31(9), pp.4145-4150.

      [13] Siami A, Karimi H R, Cigada A, Zappa E, Sabbioni E, Parameter optimization of an inertia-based isolator for passive vibration control of Micheangelo’sRondanini Pieta. Mechanical Systems and Signal Processing, 2018, 98, pp.667-683.

      [14] Wu Z, Jing X, Sun B, Li F, A 6DOF passive vibration isolator using X-shape supporting structures. Journal of Sound and Vibration, 2016, 380, pp.90-111.

      [15] [Lee J, Okwudire C E, Reduction of vibrations of passively-isolated ultra-precision manufacturing machines using mode coupling. Precision Engineering, 2016, 43, pp.164-177.

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  • How to Cite

    Soo Lee, G., Yeon Lee, M., Hyun Kim, K., & Jung Kim, C. (2018). Selection of damping coefficient of simplified mount module to control transmissibility of environmental response under nobase mass-block. International Journal of Engineering & Technology, 7(2.12), 151-155. https://doi.org/10.14419/ijet.v7i2.12.11114