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Purpose <p>This study aims to investigate vibration energy harvesting from a car’s suspension system using apiezoelectric stack placed in series with the shock absorber. The objective is to accurately model theelectromechanical behavior of the energy harvester using Mason’s and Martin’s equivalent circuits.</p> Method <p>A two-degree-of-freedom (2-DOF) model is used to evaluate the harvested voltage and power. Thesuspension system with the harvester is implemented in the LTspice simulator using an equivalent electrical circuitapproach. Mason’s and Martin’s circuit models are compared in terms of accuracy and ease of implementation.</p> Results <p>For a stack composed of 40 piezoelectric layers, the voltage and power curves computed using Martin’scircuit and Mason’s accurate model show similar results, but Martin’s model is easier to implement in LTspice.The maximum voltage and power occur at the first resonant frequency, reaching 25.12 V and 63.09 mW under aharmonic excitation of 9.8 m/s<sup>2</sup>. A comparison with Mason’s simplified model reveals differences of 2.47% involtage and 4.98% in power, with discrepancies increasing when the harvester’s losses are not considered (3.18%and 6.47%).</p> Conclusion <p>This study demonstrated effective vibration energy harvesting from a car’s suspension using apiezoelectric stack. Martin’s equivalent circuit was easier to implement in LTspice and yielded similar results toMason’s model, with a 2.47% difference in voltage and 4.98% in power. The maximum voltage and power wereobtained at the first resonant frequency, with losses increasing discrepancies to 3.18% for voltage and 6.47% forpower.</p>

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Equivalent Circuits for Vibrations’ Energy Harvesting from Automotive Suspensions: Mason and Martin Models

  • 期刊论文

  • 发表日期：

    2025年1月31日

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  • Ayoub Benhiba,
  • Abdelmajid Bybi,
  • Hilal Drissi,
  • Adil Salbi,
  • Ouadia Mouhat,
  • Ilyas Lahlouh

摘要

Purpose

This study aims to investigate vibration energy harvesting from a car’s suspension system using apiezoelectric stack placed in series with the shock absorber. The objective is to accurately model theelectromechanical behavior of the energy harvester using Mason’s and Martin’s equivalent circuits.

Method

A two-degree-of-freedom (2-DOF) model is used to evaluate the harvested voltage and power. Thesuspension system with the harvester is implemented in the LTspice simulator using an equivalent electrical circuitapproach. Mason’s and Martin’s circuit models are compared in terms of accuracy and ease of implementation.

Results

For a stack composed of 40 piezoelectric layers, the voltage and power curves computed using Martin’scircuit and Mason’s accurate model show similar results, but Martin’s model is easier to implement in LTspice.The maximum voltage and power occur at the first resonant frequency, reaching 25.12 V and 63.09 mW under aharmonic excitation of 9.8 m/s2. A comparison with Mason’s simplified model reveals differences of 2.47% involtage and 4.98% in power, with discrepancies increasing when the harvester’s losses are not considered (3.18%and 6.47%).

Conclusion

This study demonstrated effective vibration energy harvesting from a car’s suspension using apiezoelectric stack. Martin’s equivalent circuit was easier to implement in LTspice and yielded similar results toMason’s model, with a 2.47% difference in voltage and 4.98% in power. The maximum voltage and power wereobtained at the first resonant frequency, with losses increasing discrepancies to 3.18% for voltage and 6.47% forpower.