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International Journal of Natural Sciences Research

June 2016, Volume 4, 6, pp 107-111

Structural Design of A Linear-Motion Type Semi-Active Damper by Finite Element Method

Takahito ADACHI

,

Kenji TAKAHARA

Takahito ADACHI 1 ,

Kenji TAKAHARA 1 
  1. Department of Electrical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, Higashi-ku, Fukuoka, Japan 1

Pages: 107-111

DOI: 10.18488/journal.63/2016.4.6/63.6.107.111

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Article History:

Received: 18 November, 2016
Revised: 21 December, 2016
Accepted: 30 December, 2016
Published: 10 January, 2017


Abstract:

The purpose of this study is to design a structure of a linear-motion type semi-active damper which can reduce the vibration caused by an earthquake. This paper proposes the more effective structure of the linear motion semi-active damper by magnetic-structure interaction analysis of finite element method using ANSYS. The semi-active damper has a simple structure that a linear mover, a magnet bar, reciprocates in coils of a stator. The size of the coils and the size of the magnetic material cover which can produce the maximum damping force are simulated under the condition that the size of the mover is fixed. The electromotive force is calculated based on the change of the produced magnetic field according to the change of the given velocity of the mover in a short time. The damping force is calculated according to the electric current which the electromotive force supplies to the connected resistance. By the simulations, more than 120 [N s/m] of the maximum damping coefficient is acquired in the case that the coil is wound up from 28.0[mm] of the inner diameter to 60.0 [mm] of the outer diameter.
Contribution/ Originality

Keywords:

Semi-active damper, Finite element method, Magnetic-structure interaction analysis, Viscous damping coefficient.

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Reference:

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  3. City of Kobe, "Comprehensive strategy for re-covery from the great Hanshin-Awaji earth-quake," pp. 25-43, 2011.
  4. National Institute for Land and Infrastructure Management, "NILIM lews letter." Retrieved from http://www.nilim.go.jp/english/nnl/no57p.pdf, 2016.
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  7. JCAST, "JCAST business news business & media watch." Retrieved from http://www.j-cast.com/2016/04/22264988.html, 2016.
  8. K. Takahara, "Characteristic analysis and trial manufacture of permanent-magnetic type linear generator," IEEJ Transactions on Industry Applications, vol. 127, pp. 669-674, 2007.
  9. K. Kubo, "Measurement of basic characteris-tics of electromagnetic linear actuator," presented at the Record of Joint Conference of Electrical and Electronics Engineers in Kyushu, 2010.
  10. T. Adachi and K. Takahara, "Analysis and measurement of damping characteristic of linear generator," International Journal of Applied Electromagnetics and Mechanics, vol. Preprint, pp. 1-8, 2016. View at Google Scholar | View at Publisher

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Funding:

This study received no specific financial support.

Competing Interests:

The authors declare that they have no competing interests.

Acknowledgement:

All authors contributed equally to the conception and design of the study.

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