Abstract
By using the experimental modal analysis, the uncoupling technique is so developed as to extract the frequency response function of a component from those of the assembly structure. First a numerical simulation for a mathematical model is used to proof the theory of uncoupling. Then the influence of noise contaminating the frequency response function is discussed for actual measurement consideration and it is found that the noise appears enhanced in the uncoupled results. A test of a simple structure is carried out to confirm the effectiveness of uncoupling technique then another example shows the importance how to idealise the connecting part between the component for accurate uncoupling.
