Short Table of the Most Important Symbols

APPENDIX

Short Table of the Most Important Symbols Simple bond, effort on top, flow below (or right and left). Cross-stroke for causality: effort acts on the side of the stroke; flow acts backwards. Half-arrow for positive direction of energy flux (power). Activated bond; corresponds to a connection of a block diagram. One-ports ^

R

Resistance element (R-element) with a relation between effort and flow.

^=^ I

Inertia element (I-element) with a relation between momentum and flux.

^^ C

Capacity element (C-element) with a relation between effort and displacement.

^=^

Se

Effort source with effort independent of flow.

^ Sf Flow source with flow independent of effort. Observation: a control or modulation by a signal is represented by an activated bond. 173

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Introduction to Bond Graphs and their Applications

Two-ports TF —

Transformer (power conserving).

GY-

Gyrator (overcrossed conserving).

transformer,

power

Observation: If the transformer or gyrator ratio is modulated by a signal, one writes MTF and MGY. Junctions p

-

Parallel junction (p-junction, power conserving), efforts equal, flows additive. Series junction (s-junction, power conserving), efforts additive, flows equal.

Multiports R

—

R-field with relations between efforts and flows.

I

I-fîeld with relations between flows and momenta.

c

C-field with relations between efforts and displacements.

Observation: additional symbols are the IC-field (§ 5.3.3), the RS-field (§ 6.3), and the SS-double source (§ 6.3).