Electromechanical Dynamics (Part 1).0064

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Mechanics - st t~ st approxunate this curve oy me piecewise linear dashed line of Fig. 2.2.9, we can represent coulomb friction mathematically by the relation f.Pd(d/dt)(X2 - Xx) f= (d d t) ( - (2.2.7) j(d/dt)(zx, - x,)( It is important to remember that coulomb friction, like all other forms of friction, produces a force that tends to oppose the relative motion of the nodes in the system. Coulomb friction can also occur in rota- tional systems, in which case an expression analogous to (2.2.7) can be used for a math- ematical description. The final model of friction that we shall consider is that resulting primarily from the ard of a viscous flui * This type of friction can be represented with fair accuracy by a model that makes the force (or torque) proportional to the square of relative velocity (or relative angular velocity). Such an expression is f = B,[ (x 2 - x x ) . (2.2.8) Once again the force produced by the friction opposes the relative mechanical
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This note was uploaded on 02/10/2012 for the course MECE 4371 taught by Professor Liu during the Fall '11 term at University of Houston.

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