Measuring and testing – Frictional resistance – coefficient or characteristics
Patent
1986-10-06
1988-08-16
Levy, Stewart J.
Measuring and testing
Frictional resistance, coefficient or characteristics
G01N 1902
Patent
active
047635088
ABSTRACT:
In a method for determining the friction torque of a test bearing, wherein one race member of the test bearing is rotated at a constant rotational speed, while the other race member is connected via a measuring head to a spring acting as force pickup which generates a signal for a measurement of the friction torque of the test bearing, in order to simultaneously enable in a simple manner a high time resolution and calibratability of the friction torque, it is proposed that the motion of the system comprising measuring head and force pickup be damped as little as possible, that in order to calibrate the entire test device, the test bearing be replaced by an air bearing, that with this air bearing arrangement a signal proportional to the spring deformation and a signal proportional to the measuring head acceleration be generated, that a composite signal be formed from the two signals and the relationship of these two signals be set so that they cancel each other out, and that in the measurement of the friction torque of the test bearing, in which case the relationship of the two signals remains unaltered, the composite signal of the two signals be determined as a measure of the friction torque occurring.
REFERENCES:
patent: 3027749 (1962-04-01), Barnard
patent: 3041867 (1962-07-01), Knudsen
patent: 3116628 (1964-01-01), Gordon
patent: 3225587 (1965-12-01), Gordon
patent: 3685342 (1972-08-01), Gordon
U. Milz, "Measurement of Force and Mass Under Influence of Unwanted Acceltion", VDI-Berichte No. 312, 1978, pp. 135-141.
J. Francz, "Die Messung Kleinster Drehmomente bei Kugellagern und Getrieben", Messtechnische Briefe, HBM, 1967, pp. 30-31.
Deutsche Forschungs -und Versuchsanstalt fur Luft -und Raumfahrt
Levy Stewart J.
Raevis Robert R.
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