Method and apparatus for vibration of a specimen by controlled e

Details Method and apparatus for vibration of a specimen by controlled e Method and apparatus for vibration of a specimen by controlled e

1976-03-03

1977-01-11

Woodiel, Donald O.

Measuring and testing

Moisture content or absorption characteristic of material

73 674, G01M 700, G01N 2900

Patent

active

040020584

ABSTRACT:
Method and apparatus for applying controlled electromagnetic force to a test specimen such as a turbine bucket to induce vibration in the specimen. The force is applied by means of an electromagnetic field produced by an electromagnet. A controlled power source supplies current to the electromagnet to maintain the applied force at a predetermined magnitude over a predetermined range of frequencies. A comparator controls the power source in response to a sensor signal representative of the frequency and magnitude of the face actually applied so as to maintain at a minimum the difference between this signal and a reference signal representative of a desired frequency and magnitude. Tuning means are provided to nullify capacitive reactance of the electromagnet which would otherwise tend to limit the current supplied by the power source as frequency is increased.

REFERENCES:
patent: 2788659 (1957-04-01), Radnar et al.
patent: 3015949 (1962-01-01), Arnold
patent: 3501952 (1970-03-01), Gergen et al.

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