Power related unbalance

To evaluate if there is a risk that 1st and 2nd order external moments will excite disturbing hull vibrations the concept of 'Power Related Unbalance' (PRU) can be used as a guide, where:

Figure 1.15 Active vibration compensator used as a thrust pulse compensator (MAN B&W Diesel)

External moment PRU = Nm/kW

Engine power

With the PRU value, stating the external moment relative to the engine power, it is possible to give an estimate of the risk of hull vibrations for a specific engine. Actual values for different MC models and cylinder numbers rated at layout point L1 are provided in MAN B&W Diesel charts.

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