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On the glitches in the force transmitted by an electrodynamic exciter to a structureAround resonance, the force transmitted by an exciter into a structure will be smaller or greater than a reference force generated by its coils due to electromechanical interaction. A simple analysis is presented which reveals how this phenomenon of force drop-off is controlled by three factors. The first factor, called Armature Mass Factor, describes a purely mechanical interaction between the structure and the exciter. The electromechanical energy conversion and its interaction with the structure yields two additional factors, called Electrical Resistance and Electrical Inductance Factors. They describe the effects of coil resistance, inductance and magnetic field strength relative to structural damping and stiffness. Present analysis indicates that, under proper circumstances, more than 90 percent of the force drop-off can be eliminated if armature-to-structure mass ratio is smaller or equal to half of modal loss factor.
Document ID
19880004242
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rao, Dantam K. (Mechanical Technology, Inc. Latham, NY, United States)
Date Acquired
September 5, 2013
Publication Date
October 1, 1987
Publication Information
Publication: NASA-Marshall Space Flight Center, The 58th Shock and Vibration Symposium, Volume 1
Subject Category
Structural Mechanics
Accession Number
88N13624
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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