Transducer system employing a spring with linear characteristics

Details Transducer system employing a spring with linear characteristics Transducer system employing a spring with linear characteristics

1983-01-27

1985-01-15

Myracle, Jerry W.

Measuring and testing

Dynamometers

For testing relative pulling power

73161, 73509, G01L 104

Patent

active

044932189

ABSTRACT:
Apparatus indicating the linear movement of a member includes a pulley and a spring disposed on the pulley and having characteristics of producing a force substantially linearly related to its speed of movement with respect to the pulley. A motor produces a displacement of the spring relative to the pulley. A transducer produces a signal related to the speed of movement of the spring relative to the pulley at each instant and provides a signal linearly related at that instant to the distance of the spring movement at that instant. A cam may also be included for converting the movement of the spring into a non-linear function having particular characteristics. Such cam may have a particular non-linear relationship on its external periphery relative to its axis of rotation. The cam and the pulley may be coupled to opposite ends of the spring to provide a conversion between the linear movement of the spring and the particular non-linear relationship provided by the cam. The spring has a particular catenary response as it becomes unwound from the pulley. A pre-programmed read-only memory may be included for adjusting the speed of movement of the spring from the pulley at each instant to compensate for the catenary response of the spring. The spring may be included in arrangements for providing for the determination of different parameters. For example, the spring may be included in arrangements for determining the parameters of a sucker rod in an oil well.

REFERENCES:
patent: 3999426 (1976-12-01), Sonderegger

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