Skin friction balance

Details Skin friction balance Skin friction balance

1988-06-23

1989-06-06

Woodiel, Donald O.

Measuring and testing

Dynamometers

Responsive to force

73147, G01L 108

Patent

active

048360350

ABSTRACT:
A skin friction balance uses a parallel linkage mechanism to avoid inaccuracies in skin friction measurement attributable to off-center normal forces. The parallel linkage mechanism includes a stationary plate mounted in a cage, and an upper and lower movable plate which are linked to each other and to the stationary plate through three vertical links. Flexure pivots are provided for pivotally connecting the links and the plates. A sensing element connected to the upper plate moves in response to skin friction, and the lower plate moves in the opposite direction of the upper plate. A force motor maintains a null position of the sensing element by exerting a restoring force in response to a signal generated by a linear variable differential transformer (LVDT).

REFERENCES:
patent: 3304775 (1967-02-01), Kistler
patent: 3742762 (1973-07-01), Tomiyasu et al.
patent: 4604903 (1986-08-01), Tcheng et al.

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