Maximum energy-efficiency compliant mechanism design for piezoelectric stack actuators

Mostafa M. Abdalla, Mary Frecker, Zafer Gürdal, Terrence Johnson, Douglas K. Lindner

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


Combined optimization of a compliant mechanism and a piezoelectric stack actuator for maximum energy conversion efficiency is considered. The paper presents a system level analysis in which the actuator and the compliant mechanism are mathematically described as linear two-port systems. The combination of stack and compliant mechanism is used to drive a structure, modeled as a mass-spring system. The analysis assumes all components to be free from dissipation, and the piezoelectric stack is driven by an ideal voltage source. Energy conversion efficiency is defined as the ratio of the output mechanical energy to the input electric energy. Theoretical bounds on the system efficiency are obtained. It is shown that the stack actuator can be optimized separately and matched to the specified structure and an optimally designed compliant mechanism. The optimization problem for the compliant mechanism is formulated to maximize a weighted objective function of energy efficiency and stroke amplification. Optimization results are presented for ground structures modeled using frame elements.

Original languageEnglish (US)
Pages (from-to)53-61
Number of pages9
JournalAmerican Society of Mechanical Engineers, Aerospace Division (Publication) AD
StatePublished - 2003
Event2003 ASME International Mechanical Engineering Congress - Washington, DC., United States
Duration: Nov 15 2003Nov 21 2003

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Space and Planetary Science


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