How do I calculate the forward and counter whirl frequencies from the lateral vibration natural frequencies ?
The gyroscopic effect of the propeller results in a forward and counter whirl frequencies which generally differ from the lateral vibration natural frequency by only a few percent, and it is commonly neglected in whirling (lateral) vibration calculations. However, an estimation of the ratio of the forward and counter whirl frequencies to the lateral natural frequency can be made by using various algorithms. Please contact SML if you require further information.
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