Measuring and testing – Brake testing – Single wheel rotating and resistance measuring means
Patent
1974-11-14
1976-02-03
Ruehl, Charles
Measuring and testing
Brake testing
Single wheel rotating and resistance measuring means
G01L 310
Patent
active
039357333
ABSTRACT:
A dynamometer in which a signal generator provides a repetitive signal of adjustable frequency, to record-playback heads fixed adjacent to similar magnetic recording mediums that are non-magnetically mounted and spaced axially apart on a drive shaft rotating without loads. Simultaneous recordings are made by the heads on the mediums and the signal generator switched off. With the rotating shaft loaded, the recordings are played back by the axially spaced recording-playback heads, and a phase difference between the recorded signal from each head is a measure of torque on the shaft. The frequency of recorded signal from either head is a measure of the speed of rotation of the shaft. The playback signals drive an electronic computer of well know design that multiplies the measure of torque by the measure of speed of rotation to provide a voltage proportional to shaft horsepower to a voltmeter that may be calibrated to read directly in horsepower given the elastic modulus of shaft material and shaft dimensions. In an excessively vibrating shaft, record-playback heads are mounted rigidly with respect to each other on a cradle that rides on the shaft and is held in place against turning with the shaft by springs attached to convenient fixed points.
REFERENCES:
patent: 2586540 (1952-02-01), Holden
patent: 2947168 (1960-08-01), Yang
patent: 3604255 (1971-09-01), Bart
patent: 3762217 (1973-10-01), Hagen
patent: 3871215 (1975-03-01), Pratt, Jr. et al.
Resco Inc.
Ruehl Charles
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