*Proceeding Paper* **Optimal Design of a Reliability Experiment Based on the Wiener Degradation Model under Limitations of the Degradation Index †**

**Evgeniya Osintseva \* and Ekaterina Chimitova \***


† Presented at the 15th International Conference "Intelligent Systems" (INTELS'22), Moscow, Russia, 14–16 December 2022.

**Abstract:** There are many degradation models that are used in reliability analyses. The Wiener degradation model is the most popular across different applications. In this paper, we propose an approach for searching for an optimal design on the basis of the Wiener degradation model. The distinguishing feature of the approach is that the condition that the degradation index cannot exceed a critical level has been taken into account. The elements of the conditional Fisher information matrix have been obtained. This enables us to calculate the optimal stress levels by maximizing the functional of the conditional Fisher information matrix. Moreover, a degradation analysis of light-emitting diodes (LEDs) has been considered.

**Keywords:** Wiener degradation model; covariates; conditional Fisher information matrix; optimal design; degradation index
