Nyquist plot
E175076
control engineering concept
frequency response plot
graphical representation
signal processing concept
The Nyquist plot is a graphical representation used in control engineering and signal processing to assess the stability and frequency response of linear time-invariant systems by plotting complex gain as a function of frequency.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Nyquist plot canonical | 7 |
| Nyquist diagram | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1523947 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Nyquist plot Context triple: [Harry Nyquist, notableWork, Nyquist plot]
-
A.
Bode plot
A Bode plot is a graphical representation of a linear system’s frequency response, showing magnitude and phase versus frequency on logarithmic scales, widely used in control and amplifier design.
-
B.
Nyquist stability criterion
The Nyquist stability criterion is a graphical frequency-domain method in control theory used to determine the stability of feedback systems by analyzing how their open-loop transfer function encircles a critical point in the complex plane.
-
C.
Nyquist theorem
The Nyquist theorem is a fundamental principle in signal processing that states a continuous signal can be perfectly reconstructed from its samples if it is sampled at more than twice its highest frequency component.
-
D.
Wiener–Khinchin theorem
The Wiener–Khinchin theorem is a fundamental result in signal processing and probability theory that relates a wide-sense stationary random process’s autocorrelation function to its power spectral density via the Fourier transform.
-
E.
Laplace transform
The Laplace transform is an integral transform widely used in mathematics, physics, and engineering to convert functions of time into functions of a complex variable, simplifying the analysis and solution of differential equations and linear systems.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Nyquist plot Target entity description: The Nyquist plot is a graphical representation used in control engineering and signal processing to assess the stability and frequency response of linear time-invariant systems by plotting complex gain as a function of frequency.
-
A.
Bode plot
A Bode plot is a graphical representation of a linear system’s frequency response, showing magnitude and phase versus frequency on logarithmic scales, widely used in control and amplifier design.
-
B.
Nyquist stability criterion
The Nyquist stability criterion is a graphical frequency-domain method in control theory used to determine the stability of feedback systems by analyzing how their open-loop transfer function encircles a critical point in the complex plane.
-
C.
Nyquist theorem
The Nyquist theorem is a fundamental principle in signal processing that states a continuous signal can be perfectly reconstructed from its samples if it is sampled at more than twice its highest frequency component.
-
D.
Wiener–Khinchin theorem
The Wiener–Khinchin theorem is a fundamental result in signal processing and probability theory that relates a wide-sense stationary random process’s autocorrelation function to its power spectral density via the Fourier transform.
-
E.
Laplace transform
The Laplace transform is an integral transform widely used in mathematics, physics, and engineering to convert functions of time into functions of a complex variable, simplifying the analysis and solution of differential equations and linear systems.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
control engineering concept
ⓘ
frequency response plot ⓘ graphical representation ⓘ signal processing concept ⓘ |
| appliesTo | single-input single-output systems ⓘ |
| assumes |
linear system behavior
ⓘ
time invariance ⓘ |
| axisType | real-imaginary plane ⓘ |
| basedOn | Nyquist stability criterion ⓘ |
| canBeExtendedTo | multi-input multi-output systems ⓘ |
| canInclude |
negative frequencies
ⓘ
positive frequencies ⓘ |
| category |
complex analysis in engineering
ⓘ
control theory ⓘ frequency-domain analysis ⓘ |
| contrastedWith | time-domain response ⓘ |
| domain | linear time-invariant systems ⓘ |
| helpsDetermine |
gain margin
ⓘ
phase margin ⓘ relative stability ⓘ |
| implementedIn |
MATLAB
ⓘ
Python control libraries ⓘ Simulink ⓘ |
| namedAfter | Harry Nyquist ⓘ |
| oftenAssumes | steady-state sinusoidal input ⓘ |
| parameterizedBy | frequency ⓘ |
| plots | imaginary part of transfer function versus real part ⓘ |
| relatedTo |
Bode plot
ⓘ
Nichols chart ⓘ
surface form:
Nichols plot
|
| represents |
complex gain as a function of frequency
ⓘ
open-loop transfer function ⓘ |
| requires | open-loop transfer function ⓘ |
| typicallyUses | logarithmic frequency scale ⓘ |
| usedBy |
control engineers
ⓘ
signal processing engineers ⓘ systems analysts ⓘ |
| usedFor |
closed-loop stability assessment
ⓘ
feedback system analysis ⓘ frequency response analysis ⓘ stability analysis ⓘ |
| usedIn |
control engineering
ⓘ
signal processing ⓘ systems engineering ⓘ |
| usedToCheck | encirclements of the point -1+0j ⓘ |
| visualizes | locus of complex values of the transfer function ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Nyquist plot Description of subject: The Nyquist plot is a graphical representation used in control engineering and signal processing to assess the stability and frequency response of linear time-invariant systems by plotting complex gain as a function of frequency.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Nyquist diagram
subject surface form:
Harry Nyquist