A method of testing pear fruit firmness with dielectric elastomer actuator excitation

Toshiki Hiruta, Kaishi Sasaki, Naoki Hosoya, Shingo Maeda, Kentaro Takagi, Itsuro Kajiwara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


The quality of pear fruits is correlated with their firmness, which is assessed by a firmness index derived from the resonance frequency and mass. Postharvest pear fruits ripen during storage, which affects the firmness. A nondestructive measurement technique is necessary to predict fruit firmness without causing any damage. Thus, this study proposes a vibration experiment technique based on dielectric elastomer actuator (DEA) excitation to determine the resonance frequency of pear fruits without any damage. Therefore, DEAs can be attached directly on fruits with curved surfaces because of their stretchability, light weight, and responsiveness and can be used to transfer the excitation force effectively. For our experiments, thin laminated DEAs were fabricated to obtain sufficient vibration excitation force, and resonance frequencies of the pear fruits were confirmed. Subsequently, the firmness indices of each target fruit were calculated and assessed. Finally, the variations in firmness indices of pear fruits during storage were confirmed, and the effectiveness of the proposed technique was validated.

Original languageEnglish
Title of host publicationElectroactive Polymer Actuators and Devices (EAPAD) XXV
EditorsHerbert R. Shea
ISBN (Electronic)9781510660717
Publication statusPublished - 2023
EventElectroactive Polymer Actuators and Devices (EAPAD) XXV 2023 - Long Beach, United States
Duration: 2023 Mar 132023 Mar 15

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceElectroactive Polymer Actuators and Devices (EAPAD) XXV 2023
Country/TerritoryUnited States
CityLong Beach


  • dielectric elastomer actuator
  • modal analysis
  • non-destructive test
  • pear fruit firmness
  • vibration experiment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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