Analysis and numerical evaluation of hand h2optimal design schemes for an electromagnetic shunt damper

Wai Kei Ao, Paul Reynolds

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


The electromagnetic coupling effect can generate electromagnetic damping to suppress disturbance, which can be utilized for vibration serviceability control in civil engineering structures. An electrodynamic actuator is used as a passive electromagnetic damper (EMD). Ideally, the EMD is assumed to be attached between the ground and the structure. The kinetic energy of the vibrating structure can be converted to electrical energy to activate the electromagnetic damping. To induce appropriate damping, the two terminals of the damper need to be closed and cascaded with a resonant shunt circuit as an electromagnetic shunt damper (EMSD). In this study, an resistance-inductance-capacitance (RLC) oscillating circuit is chosen. For determination of optimal circuit components and comparing against the tuned mass damper (TMD), existing H∞ design formulae are applied. This work extends this with a detailed development of an H2 robust optimization technique. The dynamic properties of a footbridge structure are then selected and used to verify the EMSD optimal design numerically. The vibration suppression performance is analytically equivalent to the dynamic characteristic of the TMD and has feasible installation and better damping enhancement. To further evaluate the potential application of the EMSD, multivibration mode manipulation via connecting multiple RLC resonant shunt circuits is adopted. The multiple RLC shunt circuit connecting to EMD is an alternative to the single mode control of a traditional TMD. Therefore, the EMSD can, in principle, effectively achieve suppression of single and multiple vibration modes.

Original languageEnglish
Article number021003-1
JournalJournal of vibration and acoustics
Issue number2
Publication statusPublished - Apr 2020
Externally publishedYes


  • Electromagnetic damper (EMD)
  • Electromagnetic shunt damper (EMSD)
  • Hoptimisation
  • Multi-mode vibration control
  • RLC resonant circuit
  • Tuned mass damper (TMD)
  • Vibration control

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering


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