Unformatted text preview: of charge leads to the result Te = awe'(V', V 2 , .... VN; 01, 02. .... ) M) aoi , (3.1.45) a0, where N We' = ,v 1 q -We. (3.1.46) 1=1 This expression is obtained by a straightforward process of exactly the same form as that used for the general magnetic field system (3.1.38) to (3.1.44). It is not necessary to find the coenergy by first determining the energy; for example, we can integrate (3.1.32) to find W' just as we integrated (3.1.9) to find W,. In general, we evaluate W, by selecting a path of integra-tion through variable space for (3.1.40) that changes the xz's with all electrical excitations zero and then changes electrical excitations with mechanical displacements held fixed. For a better understanding of the meaning of coenergy consider the A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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- Fall '11
- DI, A-PDF Split DEMO, watermark Lumped-Parameter Electromechanics