PSI - Issue 58

Kay Büttner et al. / Procedia Structural Integrity 58 (2024) 95–101 Kay Büttner et al. / Structural Integrity Procedia 00 (2019) 000–000

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improved and a relative signal damage of 128% is achieved for the example shown (see Fig. 3). Way more realistic load date acquisition is possible.

a.)

b.)

Fig. 2. (a) Model Dronka and Rauh (2007) adapted; (b) Complex mount model Ernst et al. (2021).

Fig. 3. Durability evaluations - operating load test Ernst et al. (2020).

3. Design value computing Due to the development process, the component properties of elastomeric bushings are usually defined by target cascading from the subsystem level to the component level as target values. These target values are determined experimentally by characterization measurements. Achieving these target values requires the definition and mutual coordination of the component geometry, the elastomer compound and the manufacturing process (see Fig. 4). A basic dimensioning of the quasi-static stiffnesses can be performed using simplified physical calculation models based on Hook's law and Shore hardness A, which represents a material parameter. Because of the simplifications in these calculation models, their use is limited to simple bushing concepts (for example: constant cross-section). For complex bushing designs, usually FE models can be used today, which require high parameterization effort and a lot of computing time. The material parameters (for example: filler, plasticizer, etc.) have a significant influence on the dynamic properties and have to be adjusted together with the manufacturing process parameters (for example: vulcanization time and pressure, etc.). The coordination of all design parameters (DP) often results in cost- and time-intensive development loops. Especially in the early vehicle development phase, neither time nor qualified parameters are available. To solve this problem, data-driven approaches can be used.