In structural dynamic systems, there is inevitable uncertainty in the input power
from a source to a receiver. Apart from the non-deterministic properties of the
vibration source and receiver, there is also uncertainty in the excitation. This
comes from the uncertainty of the forcing location on the receiver, its relative
phase, its amplitude distribution at multiple contact points and also the spatial
separation of these points. Moreover, the uncertainty becomes more significant as
only translational force is considered while the moment excitation is often
excluded in the calculation. This paper investigates the effect of moment
excitation on the uncertainty in the vibration input power to a structure.
Quantification of the uncertainty using possibilistic and probabilistic approaches
are made. These provide the maximum and minimum bounds and the statistics of
the input power, respectively. Expressions for the bounds, mean and variance are
presented as well as the frequency band-averaged results
