# Special Issue \"Applications of Finite Element Modeling for Mechanical and Mechatronic Systems\"
###### Abstract
Finally in a paper from aerospace industrial application the paper [6] shows an application of FEM for the analysis of thin-layer composites used for designed load-bearing structures. Due to proposed software enabling quick evaluation of such structure a facilitation of the initial concept has been possible. The proposed procedure used FEM for verification and improvement of the composite component. Further examples of the application of FEM for the analysis of complex mechatronic issues present in modern production engineering industry is the paper [7] describing the compensation of strain deviation in the machine direction of a web in the roll-to-roll process for optimal mass-production of flexible devices at low cost. According to the results of a comparative experiment conducted to confirm the correcting performance of the optimized roller, the strain deviation in the machine direction decreased by approximately 48% with the proposed roller compared to that of the conventional roller. An industrial solution of engineering problem has been performed in [8]. The aim of the study presented here has been to predict properly the influence of high peening coverage on the Almen intensity and residual comprehensive stress. Therefore a quantitative description of the peening coverage has been developed. Based on the quantitative description, the finite element simulation and Almen test have been carried out. The simulation results of arc height and saturation curve have agreed well with that of the Almen test, by which the effectiveness of the quantitative description and FE simulation have been proved. The further study indicated that in shot peening processes, the excessive peening coverage does not improved Almen intensity and residual compressive stress. Following, an important aspect of industrial safety analysis that is of key importance to the mining industry an interesting FEM application for mechatronic system has been presented by [9] where a thorough analysis has been performed in order to determine how the tensile strength of roof rocks influences the extent of the zone with a particularly high risk of spontaneous coal combustion (endogenous fires) in caving goaves of the long-walls ventilated with the Y-type system. To achieve this goal, model-based tests have been conducted for a region of the long-wall mined with caving and ventilated with the Y-type system. The results obtained indicate that the type of rocks forming the caving affects its permeability and the extent of the risk zone for spontaneous coal combustion. The effectiveness of these measures significantly may improve the safety of mining exploitation. The complex nature of the analysis of issues related to the safety of machinery and equipment, and in particular the detection and observation of fatigue damage, is the subject of the following articles [10; 11; 12]. In this study, [10], the technique of a digital holographic microscope and a digital height correlation method has been applied in combination with finite element analysis using a 2D and 3D model simulating the turbine blades to ensure their safety against damage. Analysis performed have clarified that the change in the surface properties under a small load varied according to the presence or absence of a crack, and elucidated the strain distribution that caused the difference in the change. The difference in the change in the top surface height distribution of the materials with and without a crack was directly proportional to the crack length. The authors here [11] have analysed the effects of impact loading acting on composite panels made out of epoxy resin as a matrix with carbon fabrics reinforced with aramid. The numerical calculations have been performed by the use of FEM and each reinforcement layer has been modeled as an independent part. The performed numerical and microscopy tests allowed to determine some destruction mechanisms of the panels depending on the geometry of the striker.