A Method for Response Replication at Component-Level in MIMO Random Testing 39 hardware and vibration control software used are the SCADAS Mobile SCM202V (V8 input and DAC4 output modules) and MIMO Random of Simcenter Testlab, respectively. The specimen chosen for the tests is a cantilever aluminum beam with rectangular section and U-shaped notches near the fixed end. A lumped mass of 0.47 kg is placed on the free-end of the beam, to tune its natural frequencies in a convenient frequency range. The detailed geometry of the beam is depicted in Figure 1. Figure 2 shows the specimen mounted on the shaker table and the sensors used during the tests. Two accelerometer are used. The tab accelerometer is placed near the fixed end of the specimen and the tip accelerometer is placed on the lumped mass. The tipaccelerometer is the location where the vibration environment is measured to obtain the PSDs to be replicated using theMPM. Additionally, a strain gauge rosette is bonded near the notches, allowing to study the fatigue damage inflicted to the specimen. The accelerometers are ICP (Integrated Circuit Piezoelectric) triaxial accelerometers byPCB Piezotronics, model 356B21. The strain gauge used is a 3/120-RY93 by HBM, which allows to measure a multi-axis strain state. In order to conduct the fatigue analysis, the obtained stress state is converted into an equivalent uni-axial stress state using the Von Mises PSD method. Fig. 1 Detailed geometry of the specimen used. Fig. 2 Specimen mounted on the shaker table and sensors used.
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