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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., also called interference diagram. == In rotordynamics == In rotordynamical systems, the eigenfrequencies often depend on the rotation rates due to the induced gyroscopic effects or variable hydrodynamic conditions in fluid bearings. It might represent the following cases: 1. ''Analytically'' computed values of eigenfrequencies as a function of the shaft's rotation speed. This case is also called "whirl speed map".〔 〕 Such chart can be used in turbine design as shown in the numerically calculated Campbell diagram example illustrated by the image: analysis shows that there are well-damped critical speed at lower speed range. Another critical speed at mode 4 is observed at 7810 rpm (130 Hz) in dangerous vicinity of nominal shaft speed, but it has 30% damping - enough to safely ignore it. 2. ''Experimentally'' measured vibration response spectrum as a function of the shaft's rotation speed (waterfall plot), the peak locations for each slice usually corresponding to the eigenfrequencies. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Campbell diagram」の詳細全文を読む スポンサード リンク
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