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MBBCh 1- ELEN1009A > Level Rate Diagrams (LRDs) > Flashcards

Level Rate Diagrams (LRDs) Flashcards

1
Q

True or false

LRDs are the most important concept in HSD

A

True

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2
Q

Which provides more information between a CLD and a LRD?

A

A LRD.

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3
Q

What type of analysis do LRDs provide?

A

Has actual numbers allowing for quantitative analysis.

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4
Q

What are rates associated with?

A

Rates have flows associated with them.

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5
Q

Levels have accumulated over time and ___ conditions.

A

initial

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6
Q

What are LRDs an essential step in?

A

LRDs are an essential step in building a model for simulations.

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7
Q

What do LRDs shift focus away from?

A

Shifts focus away from an individual in the system to see larger accumulation.

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8
Q

What are the components of LRDs? (5)

A
  • Level (stock)
  • Rate (flow)
  • Auxiliary variable
  • Boundary
  • Arrows
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9
Q

What is a Level (stock)?

A

Variable in a system that accumulates and represents the state of the system at a given time. (stuff of the model)

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10
Q

What is a Rate (flow)?

A

Variable in a system that represents the rate of change of a quantity over time and influences the level either positively (as an inflow) or negatively (as an
outflow).

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11
Q

What is an Auxiliary variable?

A

Additional variable that is neither a level nor a rate and often represents a coefficient, conversion factor or lookup table.

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12
Q

What does a boundary do?

A

Limits of a model.

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13
Q

What is the function of arrows in LRDs?

A

Links the components of a system drawing to illustrate dependencies.

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14
Q

What do state variables do?

A

Identifies the state of the system.

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15
Q

Levels (stocks) must be ______.

A

quantifiable

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16
Q

Accumulations all around us

- Levels with ____ rates can go up and levels with ____ rates can go down

A

inflows

outflows

17
Q

Accumulation of the net flow rate over time

- Net flow rate = ______________________.

A

Net flow rate = inflow rate – outflow rate

18
Q

How are levels (stocks) represented mathematically?

A

Mathematically represented by an integral.

19
Q

How are rates always measured?

A

Always measured per unit time.

20
Q

What is a rate?

A

Represented variables/events that cause levels to increase or decrease

21
Q

Do rates have memory?

A

No memory.

22
Q

How are rates mathematically represented?

A

Mathematically represented as derivatives dy/dx.

23
Q

How do you get an increase and decrease in rate?

A

Increase: inflow
Decrease: outflow

24
Q

What is the function of an auxiliary level? (3)

A
  • Adds additional information to the model (not a level or rate)
  • Adds model transparency and details (decreased abstractions or hidden information)
  • Allows model to function properly
25
Q

What could auxiliary variables contain? (3)

A

Could contain:

  • Numerical value (constant)
  • Equation or calculation
  • Look up table
26
Q

What do boundaries focus on?

A

Focuses on modelling and not real world phenomena.

27
Q

What are boundaries?

A

Boundaries are an important part of modelling and define the part of the system we are interested in.

28
Q

In terms of boundaries,
Start:
End:

A

Start: Source
End: Sink

29
Q

What is the equation of an example level?

A
30
Q

What is the equation for example rate?

A
31
Q

What is the OTHER formula for example level?

A
32
Q

What does the differentiation of a level result in?

A
33
Q 
What are the level rate pairs for the following? 
Distance (m) - 
Speed (m/s) -
Energy (J) -
Charge (C) -
A

Distance (m) - (m/s) Speed/Velocity
Speed (m/s) - (m/s^2) Acceleration
Energy (J) - (J/s) = W Power
Charge (C) - (C/s) = A Current

34
Q

What is dimensional analysis?

A

Analysis of relationship between physical quantities.

35
Q

What are the two parameters for dimensional analysis? (2)

A
  • We analyse the units measured

- Treat units as algebraic

36
Q

What are the base Si units? (5)

A
37
Q

What are the Si prefixes?

A

MBBCh 1- ELEN1009A (18 decks)

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