FeedbackTest

Computes the difference between two input signals.

The FeedbackTest component demonstrates a basic feedback mechanism by subtracting the value of one constant (2) from another constant (1), resulting in an output of -1. This illustrates the core functionality of a feedback control system where one signal is subtracted from another.

Usage

FeedbackTest()

Behavior

$$\begin{array}{rl}\mathtt{feedback}\mathtt{.}\mathtt{u}\mathtt{1}\left(t\right)& =\mathtt{c}\mathtt{1.}\mathtt{y}\left(t\right)\\ \mathtt{feedback}\mathtt{.}\mathtt{u}\mathtt{2}\left(t\right)& =\mathtt{c}\mathtt{2.}\mathtt{y}\left(t\right)\\ \mathtt{c}\mathtt{1.}\mathtt{y}\left(t\right)& =\mathtt{c}\mathtt{1.}\mathtt{k}\\ \mathtt{c}\mathtt{2.}\mathtt{y}\left(t\right)& =\mathtt{c}\mathtt{2.}\mathtt{k}\\ \mathtt{feedback}\mathtt{.}\mathtt{y}\left(t\right)& =-\mathtt{feedback}\mathtt{.}\mathtt{u}\mathtt{2}\left(t\right)+\mathtt{feedback}\mathtt{.}\mathtt{u}\mathtt{1}\left(t\right)\end{array}$$

Source

# Computes the difference between two input signals.
#
# The `FeedbackTest` component demonstrates a basic feedback mechanism by subtracting the value of
# one constant (2) from another constant (1), resulting in an output of -1. This illustrates the
# core functionality of a feedback control system where one signal is subtracted from another.
test component FeedbackTest
  # Constant block with value 1 that provides the primary input signal
  c1 = Constant(k=1)
  # Constant block with value 2 that provides the feedback signal to be subtracted
  c2 = Constant(k=2)
  # Feedback block that subtracts the second input from the first
  feedback = Feedback()
relations
  # Connects the output of constant block c1 to the primary input of the feedback block
  connect(feedback.u1, c1.y)
  # Connects the output of constant block c2 to the feedback input of the feedback block
  connect(feedback.u2, c2.y)
metadata {
  "Dyad": {"tests": {"case1": {"stop": 5, "expect": {"final": {"feedback.y": -1}}}}}
}
end

Flattened Source

# Computes the difference between two input signals.
#
# The `FeedbackTest` component demonstrates a basic feedback mechanism by subtracting the value of
# one constant (2) from another constant (1), resulting in an output of -1. This illustrates the
# core functionality of a feedback control system where one signal is subtracted from another.
test component FeedbackTest
  # Constant block with value 1 that provides the primary input signal
  c1 = Constant(k=1)
  # Constant block with value 2 that provides the feedback signal to be subtracted
  c2 = Constant(k=2)
  # Feedback block that subtracts the second input from the first
  feedback = Feedback()
relations
  # Connects the output of constant block c1 to the primary input of the feedback block
  connect(feedback.u1, c1.y)
  # Connects the output of constant block c2 to the feedback input of the feedback block
  connect(feedback.u2, c2.y)
metadata {
  "Dyad": {"tests": {"case1": {"stop": 5, "expect": {"final": {"feedback.y": -1}}}}}
}
end

Test Cases

This is setup code, that must be run before each test case.

using BlockComponents
using ModelingToolkit, OrdinaryDiffEqDefault
using Plots
using CSV, DataFrames

snapshotsdir = joinpath(dirname(dirname(pathof(BlockComponents))), "test", "snapshots")

"/home/actions-runner-10/.julia/packages/BlockComponents/77kIK/test/snapshots"

Test Case case1

@mtkbuild model_case1 = FeedbackTest()
u0_case1 = []
prob_case1 = ODEProblem(model_case1, u0_case1, (0, 5))
sol_case1 = solve(prob_case1)

retcode: Success
Interpolation: 1st order linear
t: 2-element Vector{Float64}:
 0.0
 5.0
u: 2-element Vector{Vector{Float64}}:
 []
 []

Related

• Examples

• Experiments

• Analyses

• Tests

  • Constant

  • Feedback