Development of a shear measurement sensor for measuring forces at human-machine interfaces

Young Kuen Cho, Seong Guk Kim, Donghyun Kim, Hyung Joo Kim, Jeicheong Ryu, Dohyung Lim, Chang Yong Ko, Han Sung Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Measuring shear force is crucial for investigating the pathology and treatment of pressure ulcers. In this study, we introduced a bi-axial shear transducer based on strain gauges as a new shear sensor. The sensor consisted of aluminum and polyvinyl chloride plates placed between quadrangular aluminum plates. On the middle plate, two strain gauges were placed orthogonal to one another. The shear sensor (54mm×54mm×4.1mm), which was validated by using standard weights, displayed high accuracy and precision (measurement range, -50 to 50N; sensitivity, 0.3N; linear relationship, R2=0.9625; crosstalk error, 0.635%±0.031%; equipment variation, 4.183). The shear force on the interface between the human body and a stand-up wheelchair was measured during sitting or standing movements, using two mats (44.8cm×44.8cm per mat) that consisted of 24 shear sensors. Shear forces on the sacrum and ischium were almost five times higher (15.5N at last posture) than those on other sites (3.5N on average) during experiments periods. In conclusion, the proposed shear sensor may be reliable and useful for measuring the shear force on human-machine interfaces.

Original languageEnglish
Pages (from-to)1721-1728
Number of pages8
JournalMedical Engineering and Physics
Issue number12
Publication statusPublished - 2014

Bibliographical note

Publisher Copyright:
© 2014 IPEM.

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biomedical Engineering


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