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Relationship among Hand Forces Imparted on a Viscoelastic Hand-Handle Interface


Relationship among Hand Forces Imparted on a Viscoelastic Hand-Handle Interface

Yao, Yumeng, Rakheja, Subhash and Marcotte, Pierre (2019) Relationship among Hand Forces Imparted on a Viscoelastic Hand-Handle Interface. Measurement . ISSN 02632241 (In Press)

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Official URL: http://dx.doi.org/10.1016/j.measurement.2019.05.08...


Design of a flexible thin-film hand sensor is presented for reliable measurements of the contact pressure/force distribution at a viscoelastic hand-handle interface, including the contact force developed by a gloved-hand grasping a tool handle. The static properties of the developed hand sensor were evaluated in terms of its drift, linearity, repeatability and hysteresis under global as well as local loads. The measured results revealed low hysteresis (<6%) and drift (≈2.9% over 30s), good linearity (r2=0.99) and repeatability (CoV=1.5%). Subsequently, an experiment was designed to establish a relationship among the grip, push and contact forces imparted on a flexible hand-handle interface. The hand-handle contact force was measured considering three interface conditions: (i) bare hand grasping an instrumented rigid handle (BH); (ii) hand grasping the instrumented handle covered by an anti-vibration material (MT); and (iii) gloved hand grasping the handle (GV). The measurements with each interface were conducting with five male subjects and nine combinations of grip (10, 30 and 50 N) and push (25, 50 and 75 N) forces. The measured data were analyzed via multiple linear regression method to explore relationships among the grip (Fg), push (Fp) and contact (Fc) forces for each hand-handle interface. The data were further analyzed to investigate the effect of anti-vibration (AV) gloves on the hand grip strength. The relationship obtained for the hand grasping a rigid handle showed good agreement with those in the reported studies, which verified the hand sensor feasibility for application to curved surfaces. The relationship obtained for the bare hand grasping the handle with flexible anti-vibration material, however, showed higher coefficients of grip (αg) and push (αp) forces compared to those observed with the rigid handle of the same diameter. A similar trend was also obtained for the gloved hand grasping the handle, which suggested higher grip strength demand for a gloved hand (GV) and hand coupling a viscoelastic handle (MT) compared to the BH condition for realizing the same level of grip/push force combination.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical, Industrial and Aerospace Engineering
Item Type:Article
Authors:Yao, Yumeng and Rakheja, Subhash and Marcotte, Pierre
Journal or Publication:Measurement
Date:28 May 2019
  • Institut de recherche Robert-Sauve en Sante et en Securite du Travail (IRSST)
Digital Object Identifier (DOI):10.1016/j.measurement.2019.05.082
Keywords:Hand force sensor, anti-vibration gloves; Hand-handle contact force; Hand forces; Sensor calibration
ID Code:985462
Deposited By: Monique Lane
Deposited On:03 Jun 2019 19:07
Last Modified:23 May 2021 01:00


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