# Mechanical Design and Testing of Mobile Monitoring Units for Security Systems
###### Abstract  
Mobile monitoring systems are currently used in many applications related to environmental applications or the monitoring of health status. However, security monitoring systems are usually chosen for a specific object, area or perimeter. The main goal of our article is to present the mechanical design of mobile monitoring units. These units create the basis of a developed mobile monitoring security system, which can be applied to monitor any area of interest, even in demanding weather conditions, involving, for example, windiness or wide operational temperature ranges. Therefore, this article is focused on the mechanical design of mobile monitoring units, which are constructed not only so that they can withstand challenging environmental conditions, but also with regard to their simple transportation, manufacturing process and, if necessary, possible repairs. During the design, emphasis was also placed on the vibrations of the mobile monitoring units and their temperature dependence, because vibrations can significantly affect the correct functioning of the mobile monitoring security system and cause false alarm situations. To confirm the correctness of the simulation models, experiments were performed on the mobile monitoring unit prototypes. FEM (finite element method) analysis; dynamic characteristics; mobile monitoring system; security system; vibrations +
Footnote †: journal: applied sciences  
0000-0001-5000-0000-0000-0000-0000-0000-0000-0000-0000-0000-0000-0000-0000-0000-00000-0000-0000-00000-0000-00000-00000-00000-0000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-00000-000000-00000-00000 used for environmental purposes, for example, for the monitoring of air quality [1; 2; 3] or its components, such as oxygen [4], pollutants [5] or hazardous gases [6]. Regarding the current issue in dealing with climate change and global heating, the concept of smart cities usually involves monitoring systems for intra-urban microclimate investigation [7] and related household heating emissions [8] or for indoor high-resolution temperature monitoring purposes [9]. Air radiation can also be monitored using mobile monitoring systems [10] placed not only on the ground, but also in the ocean [11]. For marine radioactivity monitoring, systems using unmanned marine vehicles have been developed [12]. Unmanned systems can not only be advantageously applied for monitoring purposes in dangerous, contaminated, polluted or inaccessible terrains, inside objects, or in search and rescue applications [13], where they have undoubted advantages in comparison to manned systems, but with the advances in sensor technology, mobile and robotic systems can also be applied in ordinary monitoring systems, for example, for environmental applications such as water quality monitoring [14] or for inspecting vehicles or devices, including air-crafts [15] or solar panels [16], where unmanned and robotic systems can also be used for cleaning purposes. Mobile monitoring systems also play an important role in preventing fires [17], mainly forest fires [18], and in the case that a wildfire occurs, a georeferencing mobile system for the real-time detection and monitoring of wildfires can be very useful for firefighters [19]. Other dangerous phenomena that have recently gained strength and intensity in many regions include thunderstorms [20]; therefore, forecasting thunderstorm cloud trends based on the monitoring data of thunder mobile positioning systems also seems to be a very promising application of mobile monitoring systems. Monitoring systems, including mobile ones, have also become an important part of agriculture, where they can be used as part of smart systems [21], for the monitoring of diseases, in greenhouses [22], or even in biogas production for the monitoring of plant environmental parameters [23].