l analysis of OPA Critical element 2: transmissibility estimation err ors ? Extra excitation tests at arbitrary positions to obtain more conditions and better transmissibility estimates ? This approach is correct as long as the impacts are applied to the mount connection points (or on the active side). ?!! Never apply impact excitations at any other arbi trary body-side location. The transmissibility between 2 DOFs (e.g. input acceleration & target pressure) is not a system characteristic & changes with the excitation location (Guillaume et al., IOMAC Conf. 2005) 3 2 1 0 0,1,2,3 = excitation locations k1,2T k1,2T Critical analysis of OPA Critical element 3: potential errors due to missing paths 1) Different OPA path contributions 2) Summed OPA contributions equal ? Path 4 is missing
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