PSI - Issue 57

Sven Maier et al. / Procedia Structural Integrity 57 (2024) 731–742

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S. Maier et al. / Structural Integrity Procedia 00 (2023) 000±000

to higher PSD stresses, but also reduces the strength due to the smaller profile, which also leads to a lower durability.

Fig. 4. MCS (1200 sample) results with assumed scatter bounds for input parameters. Upper row shows the 1st eigenfrequency f 1 . Lower row shows the durability results for hotspot 1. Variant 1: a) & d), variant 2: b) & e), variant 3: c) & f).

3. Experimental Validation

3.1. Modal Analysis

In order to characterise the structural dynamic behaviour of the investigated system and to obtain experimental results for a comparison of the eigenfrequencies and eigenmodes, an experimental modal analysis was carried out for the three variants. Initially, the actual dispersions of the considered parameter listed in Table 1 were recorded by means of a calliper gauge and a scale. The measurements can be viewed in Table 3.

Table 3. Experimental measurements of the considered input parameters.

Parameter

Mean value ( µ )

Unit

Quantity of measures

C.o.V. ( σ/µ )

Component’s concentrated mass m c

7.43E-01 3.96E-03 1.026E-03 7.89E-04

kg

24 24 16

0.7%

m m m

0.36% 0.75% 0.93%

Thickness of mounting t m

Thickness of plate t p

8

Thickness of thinner plate t tp

Apart from minor discrepancies between the measured mean values and the nominal values from the Catia model, the scatter was significantly lower than assumed from the literature, which can be seen in the lower C.o.V.. It should be taken into account that the measured parts all originated from one batch and the deviations due to production are minimal. Parts from di ff erent batches might show higher scatter. In the subsequent modal analysis, a frequency range up to 200 Hz was investigated in detail and every 0.125 Hz steps a sample was recorded. Two integral shakers were