PSI - Issue 38

Florian Grober et al. / Procedia Structural Integrity 38 (2022) 352–361 Grober, Janßen, Küçükay / Structural Integrity Procedia 00 (2021) 000 – 000

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6. Validation and test Since a complete durability road testing experiment is expensive and takes a long time, a shortened scenario was developed for the first validation. For this purpose, the general driving variables velocity, longitudinal acceleration and lateral acceleration were considered. They are available from standard sensors for the Electronic Stability Program. Thus, they are suitable both for a collection of customer usage data in the field and for a monitoring with the driver guidance system in a durability road test. In addition, they describe the general driving style and are therefore transferable to other vehicles within certain limits. For the three assessed values, customer-oriented target spectra were defined, which represent ten kilometers of city driving. As counting methods, ‘Time -at- Level’ was applied to the velocity and ‘L evel-Crossing ’ to the accelerations. In order to fill the experience database, multiple measurements were carried out on the course of the proving ground in advance. Within the validation experiment, ten kilometers were driven according to the instructions of the driver guidance system. In general, a correct functionality of the system as well as a good comprehensibility and feasibility of the instructions were determined. The following figures compare the measured velocity and acceleration spectra to their targets.

Fig. 6. Comparison of velocity spectra (target versus test drive).

Fig. 6 shows the velocity profiles. Even if the curves are not exactly congruent due to a small shift from low to mean speeds, the basic trend matches acceptable well .

Fig. 7. Comparison of longitudinal acceleration spectra (target versus test drive).