23 Predicting System Response at Unmeasured Locations Using a Laboratory Pre-Test 219 Fig. 23.1 MATV solid model cutaway (Left) and acoustic test setup (Right) Fig. 23.2 MATV modal test setup for pre-test component, one on the cone wall near the large end, and two at locations on the flat component mounting plate. In addition, 4 channels on the RC cross beam were “truth” accelerometer (u) dof. This left 53 candidate accelerometer channels for possible measurement (m) dof. None of the measurement dof were a repeat of any of the unmeasured dof. Based on engineering judgment the mdof were at various locations on the cone, pipe, component plate, cover plate and RC. A multiple input multiple output (MIMO) shaker modal test with three shakers operating simultaneously was conducted to 2000 Hz using burst random excitation. The shaker arrangement for the test is shown in Fig. 23.2.
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