Dairy production on pasture : an introduction to grass based by Lee Rinehart; Appropriate Technology Transfer for Rural

By Lee Rinehart; Appropriate Technology Transfer for Rural Areas (Organization); ATTRA National Sustainable Agriculture Information Service.; National Center for Appropriate Technology

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11 (right) remains. Simplifications of this kind arise in practice by setting the effort (the potential in electrical systems) of one p-junction equal to zero, which means that all other potentials are measured from the value of this potential. 5] 33 Fundamentals of Bond Graphs A transformer can be interchanged with a p-junction or a s-junction as shown in Fig. 12 if the other bond receives a new transformer with the reciprocal ratio 1/i. This is intuitively evident but follows also from a mathematical manipulation of the relevant equations.

1. in different causality. with half-arrows for the positive energy directions and in two different causalities. Furthermore, the bonds are numbered 1—4 and consequently the velocities denoted Vi—v4 and forces denoted Fi—F 4 . As usual the direction of energy fluxes are chosen such that they are positive when power leaves the sources and enters the oneports. The effort source imposes an effort to the system and determines the causality with the effort acting on the s-junction (Chapter 2). This is indicated by the cross-stroke at the bond between the effort source and the s-junction.

9. Simplification of a ring of p- and s-junctions. 9 (left) is a bond graph with a loop of two p- and two s-junctions as frequently encountered in mechanics. The s-junctions lead to other bonds a and b connected with the sources Sa and Sb. On the ^-junction there are the bonds C and R with the one-ports shown as example. It is now possible to replace the loop by the two junctions of Fig. 9 (right) under the condition that the signs on both p-junctions are chosen equal. In other words both fc and fr must be the sum of f!

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