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Unformatted text preview: 2.2.2a motion is constrained to the vertical and the forcef(t) is vertical. The position of the arrow indicates the direction of positive force, and the convention we use here is that, with the arrow as shown and a positivef(t), the force tends to push the two mechanical nodes apart exactly as if one were standing on node ax and pushing upward on node X, with the hands. The circuit representation of this force source is given in Fig. 2.2.2b. In the circuit our convention is that with the arrow as shown [f(t) positive] the force tends to increase z 2 and decrease x 1 . The sources of Figs. 2.2.1 and 2.2.2 have been specified for translational systems. We can also specify analogous sources and circuits for rotational 2.2.1 l A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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- Fall '11