Mounting and calibration of stairs on piezoelectric force platforms

MP Besser; DL Kowalk; CL Vaughan

doi:10.1016/0966-6362(93)90051-2

Mounting and calibration of stairs on piezoelectric force platforms

MP Besser, DL Kowalk, CL Vaughan

Division of Engineering and Science (Abington)

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

To calculate the centre of pressure using piezoelectric force plates mounted on pads, no net tensile stresses may be imposed on the surface of the plate. This condition is violated when stairs are attached to the plates, unless the plates are preloaded. Typical shear forces encountered when climbing stairs were used to determine required preloads of approximately 16.4 N/cm step height. Vertical and horizontal loads were applied at known locations on the steps, and points of application were calculated. Deviations were within ± 3 mm. The effect of point of application inaccuracy on calculated joint moments is considerable. A 2 cm medial shift in the point of application resulted in calculated peak knee abduction/adduction moment errors of 35%.

Original language	English (US)
Pages (from-to)	231-235
Number of pages	5
Journal	Gait and Posture
Volume	1
Issue number	4
DOIs	https://doi.org/10.1016/0966-6362(93)90051-2
State	Published - Dec 1993

All Science Journal Classification (ASJC) codes

Biophysics
Orthopedics and Sports Medicine
Rehabilitation

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10.1016/0966-6362(93)90051-2

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title = "Mounting and calibration of stairs on piezoelectric force platforms",

abstract = "To calculate the centre of pressure using piezoelectric force plates mounted on pads, no net tensile stresses may be imposed on the surface of the plate. This condition is violated when stairs are attached to the plates, unless the plates are preloaded. Typical shear forces encountered when climbing stairs were used to determine required preloads of approximately 16.4 N/cm step height. Vertical and horizontal loads were applied at known locations on the steps, and points of application were calculated. Deviations were within ± 3 mm. The effect of point of application inaccuracy on calculated joint moments is considerable. A 2 cm medial shift in the point of application resulted in calculated peak knee abduction/adduction moment errors of 35%.",

author = "MP Besser and DL Kowalk and CL Vaughan",

note = "Funding Information: This work was supportedin part by grantsf rom the US Department of Education under a Rehabilitation",

year = "1993",

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doi = "10.1016/0966-6362(93)90051-2",

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T1 - Mounting and calibration of stairs on piezoelectric force platforms

AU - Besser, MP

AU - Kowalk, DL

AU - Vaughan, CL

N1 - Funding Information: This work was supportedin part by grantsf rom the US Department of Education under a Rehabilitation

PY - 1993/12

Y1 - 1993/12

N2 - To calculate the centre of pressure using piezoelectric force plates mounted on pads, no net tensile stresses may be imposed on the surface of the plate. This condition is violated when stairs are attached to the plates, unless the plates are preloaded. Typical shear forces encountered when climbing stairs were used to determine required preloads of approximately 16.4 N/cm step height. Vertical and horizontal loads were applied at known locations on the steps, and points of application were calculated. Deviations were within ± 3 mm. The effect of point of application inaccuracy on calculated joint moments is considerable. A 2 cm medial shift in the point of application resulted in calculated peak knee abduction/adduction moment errors of 35%.

AB - To calculate the centre of pressure using piezoelectric force plates mounted on pads, no net tensile stresses may be imposed on the surface of the plate. This condition is violated when stairs are attached to the plates, unless the plates are preloaded. Typical shear forces encountered when climbing stairs were used to determine required preloads of approximately 16.4 N/cm step height. Vertical and horizontal loads were applied at known locations on the steps, and points of application were calculated. Deviations were within ± 3 mm. The effect of point of application inaccuracy on calculated joint moments is considerable. A 2 cm medial shift in the point of application resulted in calculated peak knee abduction/adduction moment errors of 35%.

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Mounting and calibration of stairs on piezoelectric force platforms

Abstract

All Science Journal Classification (ASJC) codes

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