## 5 Conclusions  
This study investigated the sensitivity of the ISM for abrasive condition monitoring on POM gears and explored the added benefit of integrated temperature and acceleration sensors.  
The analysis of wear patterns revealed a consistent linear trend, indicating a constant rate of wear. It was concluded that there were no distinct running-in or constant wear phases, aligning with current research suggesting the absence of such phases at ambient temperatures and high loads. The integrated temperature sensors demonstrated the ability to reliably measure gear temperature. The temperature analysis showed bounded growth, reaching a static bound temperature after 1:20 h into a two-hour sequence. The correlation between ISM and infrared camera measurements confirmed the reliability of the ISM temperature data. The increase of the temperature, along with the sidebands, suggested a possible temperature-dependent influence on abrasive wear. A vibration analysis using the ISM highlighted its sensitivity to changes in gear conditions. The dominant presence of lower frequencies, such as the shaft frequency, in the ISM spectrum distinguished it from BBS. Three phases were identified in the GCMs. The ISM showed less variation and higher sensitivity in the results compared to the BBS, indicating the increased robustness of gear condition monitoring. This publication also discussed the potential influence of temperature on ISM accelerometers, which should be considered in future studies.  
This study addresses two detailed research questions. Firstly, the study confirms that the vibration analysis based on ISM provides more sensitive condition monitoring, allowing a potentially better assessment of POM gear wear conditions compared to BBS. Secondly, the integrated temperature sensor as part of the ISM provides reliable data that correlate with POM gear wear. Temperature variations over time are consistent with wear characteristics, highlighting the potential of the sensor to assess gear condition.  
While this study focused on a high rate of abrasive wear, future research should investigate different wear mechanisms, especially tooth root fracture, which is of high interest. Therefore, the potential benefits of new integrated sensors need to be further explored to improve condition monitoring. Additionally, new models for assessing actual wear based on new integrated sensors must be investigated to achieve better wear monitoring and potentially calculate the remaining useful life of a POM gear. To better understand the uncertainties that come with such wear monitoring based on integrated sensor data and a model, a higher sample size should be investigated in the future.  
Conceptualization, J.P.; methodology, S.H.; software, S.H.; validation, S.H.; formal analysis, S.H.; investigation, S.H.; resources, S.M.; data curation, S.H.; writing--original draft preparation, S.H.; writing--review and editing, J.P.; visualization, S.H.; supervision, S.M.; project administration, S.M.; funding acquisition, S.M. All authors have read and agreed to the published version of the manuscript.  
Figure 15: Tooth surface of the worn POM gear 1.  
**Funding:** This research was funded by [PERSON]-[PERSON]. The APC was funded by KIT-Publicationsfonds.  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** The data that support the findings of this study are available from the corresponding author upon reasonable request.  
**Conflicts of Interest:** The authors declare no conflicts of interest.