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輪機工程(概要)（包括推進裝置、輔機與輪機英文）題庫下載題庫

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10.Longitudinal vibration of propulsion shafting systems is often excited by the variable thrust developed by the propeller due to the non-uniform wake pattern in which it operates. The predominant periodic component of the thrust developed by a propeller occurs at blade-rate frequency, i.e., the number of propeller blades times the rotational frequency of the shaft. For a four-blade propeller running at 60 rev/min, what is the predominant periodic frequency that excites the longitudinal vibration of the propulsion shafting systems?
(A)1 Hz
(B)2 Hz
(C)3 Hz
(D)4 Hz



10.Longitudinal vibration of propulsion ..-阿摩線上測驗