flow graph - definizione. Che cos'è flow graph
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Cosa (chi) è flow graph - definizione


Rooted graph         
GRAPH IN WHICH ONE VERTEX HAS BEEN DISTINGUISHED AS THE ROOT
Accessible pointed graph; Rooted directed graph; Rooted digraph
In mathematics, and, in particular, in graph theory, a rooted graph is a graph in which one vertex has been distinguished as the root.. See p.
Signal-flow graph         
  • Example: Block diagram and two equivalent signal-flow graph representations.
  •  Signal flow graph of a circuit containing a two port.  The forward path from input to output is shown in a different color.  The dotted line rectangle encloses the portion of the SFG that constitutes the two-port.
  • Figure 4: A different signal-flow graph for the [[asymptotic gain model]]
  • Elements and constructs of a signal flow graph.
  • Flow graph for three simultaneous equations. The edges incident on each node are colored differently just for emphasis. Rotating the figure by 120° simply permutes the indices.
<math>x_1= \left( c_{11} +1 \right) x_1 +c_{12} x_2 +c_{13} x_3 - y_1 \ ,</math>
<math>x_2= c_{21} x_1 +\left( c_{22} +1 \right) x_2 +c_{23} x_3 - y_2 \ ,</math>
<math>x_3= c_{31} x_1 +c_{32} x_2 + \left( c_{33} +1 \right) x_3 - y_3 \ .</math>
  • (a) Simple flow graph, (b) The arrows of (a) incident on node 2 (c) The arrows of (a) incident on node 3
  • Figure 3: A possible signal-flow graph for the [[asymptotic gain model]]
  •  Angular position servo and signal flow graph.  θ<sub>C</sub> = desired angle command, θ<sub>L</sub> = actual load angle, K<sub>P</sub> = position loop gain, V<sub>ωC</sub> = velocity command, V<sub>ωM</sub> = motor velocity sense voltage, K<sub>V</sub> = velocity loop gain, V<sub>IC</sub> = current command, V<sub>IM</sub> = current sense voltage, K<sub>C</sub> = current loop gain, V<sub>A</sub> = power amplifier output voltage, L<sub>M</sub> = motor inductance, V<sub>M</sub> = voltage across motor inductance, I<sub>M</sub> = motor current, R<sub>M</sub> = motor resistance, R<sub>S</sub> = current sense resistance, K<sub>M</sub> = motor torque constant (Nm/amp), T = torque, M = moment of inertia of all rotating components α = angular acceleration, ω = angular velocity, β = mechanical damping, G<sub>M</sub> = motor back EMF constant, G<sub>T</sub> = tachometer conversion gain constant,.  There is one forward path (shown in a different color) and six feedback loops.  The drive shaft assumed to be stiff enough to not treat as a spring.  Constants are shown in black and variables in purple.
  • Figure 1: SFG of a simple amplifier
  • Signal flow graph refactoring rule: replacing parallel edges with a single edge with a gain set to the sum of original gains.
  • Signal flow graph refactoring rule: a looping edge at node N is eliminated and inflow gains are multiplied by an adjustment factor.
  • Signal flow graph refactoring rule: replacing outflowing edges with direct flows from inflowing sources.
  • Signal flow graph refactoring rule: eliminating outflowing edges from a node known to have a value of zero.
  • Signal flow graph refactoring rule: a node that is not of interest can be eliminated provided that it has no outgoing edges.
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  • A simple RC system and its closed flowgraph.  A "dummy" transmittance Z(s) is introduced to close the system.<ref name=Happ66 />
  • State transition signal-flow graph.  Each initial condition is considered as a source (shown in blue).
A SPECIALIZED FLOW GRAPH, A DIRECTED GRAPH IN WHICH NODES REPRESENT SYSTEM VARIABLES, AND BRANCHES (EDGES, ARCS, OR ARROWS) REPRESENT FUNCTIONAL CONNECTIONS BETWEEN PAIRS OF NODES
Mason graph; Signal flow graph
A signal-flow graph or signal-flowgraph (SFG), invented by Claude Shannon, but often called a Mason graph after Samuel Jefferson Mason who coined the term, is a specialized flow graph, a directed graph in which nodes represent system variables, and branches (edges, arcs, or arrows) represent functional connections between pairs of nodes. Thus, signal-flow graph theory builds on that of directed graphs (also called digraphs), which includes as well that of oriented graphs.
Null graph         
GRAPH WITHOUT EDGES (ON ANY NUMBER OF VERTICES)
Empty tree; Empty graph; Null Graph; Null tree; Singleton graph; Edgeless graph; Order-zero graph
In the mathematical field of graph theory, the term "null graph" may refer either to the order-zero graph, or alternatively, to any edgeless graph (the latter is sometimes called an "empty graph").

Wikipedia

Flow graph
Flow graph may refer to: