56 J.H. Gordis Fig. 4.26 Measured data – 177 9 solve Fig. 4.27 Simulated data – 177 9 solve trial-and-error search. However, an error would have to be successively moved from one parameter to the next to calculate the ABC frequencies. This can be efficiently done using frequency domain structural synthesis [8]. More sophisticated ways of determining this optimal ABC set/mode combination is under continuing research. 2. An error in a specified parameter cannot be found if the simulation is not able to find it. In other words, an error in a specified parameter can only be found using an optimal ABC set/mode combination for that parameter. 3. For a given optimal ABC set/mode combination, those parameters which are identified as “false-alarm” parameters will show false alarms using the test data. 4. The optimal ABC set/mode combinations for a given parameter may or may not include the ABC-QR-optimal set number for the parameter.
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