How bias errors affect experimental dynamic substructuring

Abstract

As it turns out experimental Dynamic Substructuring is very sensitive to all kinds of measurement and modeling errors. In [1, 9] a statistical method was formulated to investigating the effect of random errors, due to measurement noise for example, on experimental dynamic substructuring. Shown that problems can especially occur at eigenfrequencies of lightly damped substructures, it doesn't really explain why coupled FRF are so often completely off in a broad frequency range. This paper adds by investigating the effect of bias errors in driving point FRFs at experimental substructure interfaces. These bias errors get into existence from a different impact location from the hammer on the substructure. ©2010 Society for Experimental Mechanics Inc.