Constant length strut

Details Constant length strut Constant length strut

1986-12-10

1988-05-03

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, H01L 4108

Patent

active

047422610

ABSTRACT:
A constant length strut includes an axially elongated body having a fixed attachment point at one end and an attachment point carried at its opposite end and supported for axial movement toward and away from the fixed attachment point. A quartz reference rod is connected at one end to one attachment point and extends internally for substantially the length of the strut. The free end of the reference rod moves axially lengthwise relative to the other attachment point as the strut changes length due to thermal expansion and contraction or tensile and compressive loading. A positional displacement transducer senses this relative movement. An electrical signal directly proportional to the displacement excites a linear actuator connected between the telescopic attachment point and the strut body to provide a corrective displacement to maintain the strut at a constant length.

REFERENCES:
patent: 4160184 (1979-07-01), Ljung
patent: 4186324 (1980-01-01), Hartzell, Jr.
patent: 4406965 (1983-09-01), Ljung
patent: 4408832 (1983-10-01), Hartman et al.
patent: 4438364 (1984-03-01), Morison
patent: 4471257 (1984-09-01), Kleinschmidt
patent: 4473768 (1984-09-01), Kerr et al.

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