Semi-active particle-based damping systems controlled by magnetic fields

Binoy M. Shah, Jeremy J. Nudell, Kevin R. Kao, Leon M. Keer, Q. Jane Wang, Kun Zhou

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


This paper reports the design of a semi-active particle-based damping system in which a dry magnetic particle bed is used to dissipate the energy of a vibrating piston. The system is magnetized by a magnetic field generated by an electromagnetic coil. Hysteresis-free, ferromagnetic materials are selected for both the piston and particles. The damping efficiency increases as the magnetization of the piston and particles increases up to saturation. Semi-active control is achieved by varying the electric current supplied to the coil, which changes the magnetization and allows for real-time tunability of the damping rate. During the process of magnetization and demagnetization, the damping is reversible and temperature-independent over a wide temperature range. This system can be useful in aerospace, automobile and structural engineering applications, particularly in harsh environments.

Original languageEnglish (US)
Pages (from-to)182-193
Number of pages12
JournalJournal of Sound and Vibration
Issue number2
StatePublished - Jan 17 2011

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering


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