*Article* **Real-Time Remote Maintenance Support Based on Augmented Reality (AR)**

#### **Dimitris Mourtzis \*, Vasileios Siatras and John Angelopoulos**

Laboratory for Manufacturing Systems and Automation, Department of Mechanical Engineering and Aeronautics, University of Patras, 26504 Patras, Greece; siatras@lms.mech.upatras.gr (V.S.); angelopoulos@lms.mech.upatras.gr (J.A.)

**\*** Correspondence: mourtzis@lms.mech.upatras.gr; Tel.: +30-2610-910-160

Received: 31 January 2020; Accepted: 5 March 2020; Published: 8 March 2020

**Abstract:** In the realm of the current industrial revolution, interesting innovations as well as new techniques are constantly being introduced by offering fertile ground for further investigation and improvement in the industrial engineering domain. More specifically, cutting-edge digital technologies in the field of Extended Reality (XR) have become mainstream including Augmented Reality (AR). Furthermore, Cloud Computing has enabled the provision of high-quality services, especially in the controversial field of maintenance. However, since modern machines are becoming more complex, maintenance must be carried out from experienced and well-trained personnel, while overseas support is timely and financially costly. Although AR is a back-bone technology facilitating the development of robust maintenance support tools, they are limited to the provision of predefined scenarios, covering only a limited number of scenarios. This research work aims to address this emerging challenge with the design and development of a framework, for the support of remote maintenance and repair operation based on AR, by creating suitable communication channels between the shop-floor technicians and the expert engineers who are utilizing real-time feedback from the operator's field of view. The applicability of the developed framework is tested in vitro in a lab-based machine shop and in a real-life industrial scenario.

**Keywords:** augmented reality; maintenance; real-time
