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A Campbell diagram plot represents a system's response spectrum as a function of its oscillation regime. It is named for Wilfred Campbell, who introduced the concept. It is also called an interference diagram.
#''Analytically'' computed values of eigenfrequencies as a function of the shaft's rotation speed. This case is also called "whirl speed map".
Such a chart can be used in turbine design.
# ''Experimentally'' measured vibration response spectrum as a function of the shaft's rotation speed (
A Campbell diagram plot represents a system's response spectrum as a function of its oscillation regime. It is named for Wilfred Campbell, who introduced the concept. It is also called an interference diagram.
In rotordynamics
In rotordynamical systems, the eigenfrequencies often depend on the rotation rates due to the inducedgyroscopic
A gyroscope (from Ancient Greek γῦρος ''gŷros'', "round" and σκοπέω ''skopéō'', "to look") is a device used for measuring or maintaining orientation and angular velocity. It is a spinning wheel or disc in which the axis of rot ...
effects or variable hydrodynamic conditions in fluid bearing
Fluid bearings are bearing (mechanical), bearings in which the load is supported by a thin layer of rapidly moving pressurized liquid or gas between the bearing surfaces. Since there is no contact between the moving parts, there is no sliding fr ...
s. It might represent the following cases:
#''Analytically'' computed values of eigenfrequencies as a function of the shaft's rotation speed. This case is also called "whirl speed map".
Such a chart can be used in turbine design.
# ''Experimentally'' measured vibration response spectrum as a function of the shaft's rotation speed (waterfall plot
Waterfall plots are often used to show how two-dimensional phenomena change over time. A three-dimensional ''spectral waterfall plot'' is a plot in which multiple curves of data, typically spectra, are displayed simultaneously. Typically the cu ...
), the peak locations for each slice usually corresponding to the eigenfrequencies.
In acoustical engineering
Inacoustical engineering
Acoustical engineering (also known as acoustic engineering) is the branch of engineering dealing with sound and vibration. It includes the application of acoustics, the science of sound and vibration, in technology. Acoustical engineers are typical ...
, the Campbell diagram would represent the pressure spectrum waterfall plot
Waterfall plots are often used to show how two-dimensional phenomena change over time. A three-dimensional ''spectral waterfall plot'' is a plot in which multiple curves of data, typically spectra, are displayed simultaneously. Typically the cu ...
vs the machine's shaft rotation speed (sometimes also called ''3D noise map'').
References
{{DEFAULTSORT:Campbell Diagram Control engineering Systems theory