< Fundamentals of Transportation
Transportation networks have analogs with network processes in other systems, such as water networks, structures, and electrical networks. Some of the relationships are outlined below.
| ' | Transportation | Water: Hydrostatics | Structures | Electrical |
| Node Conservation Law | Flow (q) | Current (Kirchoff’s Current Law) | ||
| Fundamental Law | q = kv | P = ρgh | F=δ (mv)/ δ (T) | V=IR |
| k = q/v | F= v δ (m)/ δ (T) | V=I/G | ||
| v=q/k | Bernoulli’s Equation: | Ohm’s Law on resistor | ||
| Constant=p+1/2ρ V2+ ρgh | ||||
| P=F/A (area) | ||||
| F=ma | ||||
| Analogs | flow (q) | Pressure (P*A) | δm/δT | Current (I) |
| density (k) | Density (ρ) | Force (F) | Voltage (V) | |
| velocity (v) | velocity (v) | velocity | Conductance (G) | |
| Equilibrium Conditions | Wardrop (time equal on used pairs in parallel) | Sum of horizontal (and sum of vertical) forces on a structure = 0, sum of moments = 0. | Voltage drop across two components in parallel are equal |
Structures
- F= force
- m = Mass
- a = acceleration
- T = Time
Transportation
- q = flow
- k = density
- v = velocity
Electricity
- V= Voltage
- I = Current
- R = Resistance
- G = Conductance = 1 / Resistance
Water
- P = hydrostatic pressure
- ρ = fluid density =mV = mass *volume
- g = acceleration due to gravity
- h = height
- c= constant
- A = area
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