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FeedbackTest.md

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 ​

BlockComponents.FeedbackTest()

Behavior ​

julia
using BlockComponents #hide
using ModelingToolkit #hide
@named sys = BlockComponents.FeedbackTest() #hide
full_equations(sys) #hide
<< @example-block not executed in draft mode >>

Source ​

dyad
"""
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) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 80, "y1": 90, "x2": 180, "y2": 190, "rot": 0}
      }
    }
  }
  "Constant block with value 2 that provides the feedback signal to be subtracted"
  c2 = Constant(k = 2) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 80, "y1": 300, "x2": 180, "y2": 400, "rot": 0}
      }
    }
  }
  "Feedback block that subtracts the second input from the first"
  feedback = Feedback() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 360, "y1": 170, "x2": 460, "y2": 270, "rot": 0}
      }
    }
  }
relations
  "Connects the output of constant block c1 to the primary input of the feedback block"
  connect(feedback.u1, c1.y) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 300, "y": 190}, {"x": 300, "y": 140}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Connects the output of constant block c2 to the feedback input of the feedback block"
  connect(feedback.u2, c2.y) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 300, "y": 250}, {"x": 300, "y": 350}], "E": 2}],
      "renderStyle": "standard"
    }
  }
metadata {
  "Dyad": {
    "icons": {"default": "dyad://BlockComponents/Example.svg"},
    "tests": {"case1": {"stop": 5, "expect": {"final": {"feedback.y": -1}}}}
  }
}
end
Flattened Source
dyad
"""
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) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 80, "y1": 90, "x2": 180, "y2": 190, "rot": 0}
      }
    }
  }
  "Constant block with value 2 that provides the feedback signal to be subtracted"
  c2 = Constant(k = 2) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 80, "y1": 300, "x2": 180, "y2": 400, "rot": 0}
      }
    }
  }
  "Feedback block that subtracts the second input from the first"
  feedback = Feedback() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 360, "y1": 170, "x2": 460, "y2": 270, "rot": 0}
      }
    }
  }
relations
  "Connects the output of constant block c1 to the primary input of the feedback block"
  connect(feedback.u1, c1.y) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 300, "y": 190}, {"x": 300, "y": 140}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Connects the output of constant block c2 to the feedback input of the feedback block"
  connect(feedback.u2, c2.y) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 300, "y": 250}, {"x": 300, "y": 350}], "E": 2}],
      "renderStyle": "standard"
    }
  }
metadata {
  "Dyad": {
    "icons": {"default": "dyad://BlockComponents/Example.svg"},
    "tests": {"case1": {"stop": 5, "expect": {"final": {"feedback.y": -1}}}}
  }
}
end


Test Cases ​

julia
using BlockComponents
using DyadInterface: TransientAnalysis, rebuild_sol
using ModelingToolkit: toggle_namespacing, get_defaults, @named
using CSV, DataFrames, Plots

snapshotsdir = joinpath(dirname(dirname(pathof(BlockComponents))), "test", "snapshots")
<< @setup-block not executed in draft mode >>

Test Case case1 ​

julia
@named model_case1 = FeedbackTest()
model_case1 = toggle_namespacing(model_case1, false)

model_case1 = toggle_namespacing(model_case1, true)
result_case1 = TransientAnalysis(; model = model_case1, alg = "auto", start = 0e+0, stop = 5e+0, abstol=1e-6, reltol=1e-6)
sol_case1 = rebuild_sol(result_case1)
<< @setup-block not executed in draft mode >>