# Trawl Grid Structure Design and Analysis Using the Finite Element Method
## 5 Conclusions  
In this study, the finite element method was used to assess the interaction of the object with the trawl mesh structure. The design variables (material, cross-section, and mesh size) were optimized using the Taguchi technique in a dynamic-explicit environment to forecast and improve the process of completing work on the mesh structure. The findings of the study are as follows:  
* The use of the Taguchi approach improved the research on the technological aspects of the trawl grid structure. The findings indicate that the material has a significant impact on the mesh structure of up to 93%. Polyamide (PA) is the suggested material because it has a higher contact stiffness matrix \(D_{i}\) than the other two materials. The next most impactful element is the cross-section (0.4 mm), which impacts 6% of the trawl mesh structure. This level of influence can be increased if the angler selects a wider cross-section because the graph tends to rise gradually. The size of the grid just depends on the size of the type of fish and has a relatively minimal impact. This study advises fisher to use Equation (11) to choose the grid size. * When a trawl mesh structure is struck by an object, the knots immediately surrounding the impact area experience the highest concentration of stress (Figure 9) and the active rope is simultaneously pulled to affect the object. Breakage is brought on by tension on the passive wire when an object is traveling at 1 m/s, since the maximum stress can reach 1280 MPa. As the object moves away, the stress gradually decreases. Application of the higher-order curve reveals that the stress characteristic curve of the mesh structure is highly reliable, as depicted in Figure 10a. * In a semi-static environment, the mechanical effort exerted on the mesh structure tends to progressively rise with the increase in the speed of the item exerting the force. Figure 10b depicts the characteristic curve of this factor after the application of the least squares approach, with a confidence level of up to 99.8%. Figure 10: The construction of the grid cells’ characteristic curve: (**a**) tensile strength and (**b**) mechanical work. Research has significantly improved the reference data for semi-static trawl mesh structures or other forms of grids with comparable structures and features. In the future, the use of more flow factors, water viscosity, and Reynolds coefficient evaluations may lead to more research development. Writing--original draft preparation, N.-D.N. ; writing--review and editing, N.-D.N. and S.-C.H. All authors have read and agreed to the published version of the manuscript. The authors acknowledge and thank the Ministry of Science and Technology of the Republic of China for their partial financial support of this study under contract number MOST 111-2221-E-992-068. Not applicable. Data Availability Statement: Data is contained within the article. The authors declare no conflict of interest. +++ ==WARNING: Truncated because of repetitions==
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