In structural dynamic systems, there is inevitable uncertainty in the input power from a source to a receiver. Apart from the\r\nnondeterministic properties of the source and receiver, there is also uncertainty in the excitation. This comes from the uncertainty\r\nof the forcing location on the receiver and, for multiple contact points, the relative phases, the force amplitude distribution at those\r\npoints, and also their spatial separation. This paper investigates quantification of the uncertainty using possibilistic or probabilistic\r\napproaches. These provide the maximum and minimum bounds and the statistics of the input power, respectively. Expressions\r\nfor the bounds, mean, and variance are presented. First the input power from multiple point forces acting on an infinite plate is\r\nexamined.The problem is then extended to the input power to a finite plate described in terms of its modes. The uncertainty due\r\nto the force amplitude is also discussed. Finally, the contribution of moment excitation to the input power, which is often ignored\r\nin the calculation, is investigated. For all cases, frequency band-averaged results are presented.
Loading....