Eddy-current system for the vibration-testing of blades

Details Eddy-current system for the vibration-testing of blades Eddy-current system for the vibration-testing of blades

1976-05-10

1977-05-31

Gill, James J.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

73 673, G01M 700

Patent

active

040261425

ABSTRACT:
This invention is an improved system for the vibration-testing of cantilevered non-ferrous articles by inducing eddy currents therein. The principal advantage of the system is that relatively little heat is generated in the article being vibrated. Thus, a more accurate measurement of the fatigue characteristics of the article is obtained. Furthermore, the generation of relatively little heat in the blade permits tests to be conducted in low-pressure atmospheres simulating certain actual processes environments.
Heat-generation in the vibrated article is minimized by utilizing eddy currents which are generated by an electromagnet whose magnetic field varies but does not change polarity. The typical winding for the electromagnet is excited with pulsating d.c. That is, the winding is alternately charged by connecting it across a d.c. power supply and then discharged by connecting it across a circuit for receiving current generated in the winding by self-induction. Preferably, the discharge circuit is designed so that the waveform of the discharging current approximates that of the charging current.

REFERENCES:
patent: 2675698 (1954-04-01), Johnson
patent: 3555887 (1971-01-01), Wood
patent: 3600934 (1971-08-01), Hendrix

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