# Wind-Load Response and Evacuation Efficiency Analysis of Marine Evacuation Inflatable Slide
## 3 Wind-Load Response Analysis of Inflatable Slide under Fluid-Solid Coupling
### Wind-Load Response of Emergency Inflatable Slide under Different Wind Speed  
In the design and analysis of sea lifesaving inflatable equipment, the wind speed gradient should be detected, and the simulation wind speed level should be improved appropriately, so as to achieve a sufficient safety factor. The ability to withstand wind speed variations is also a necessary test element for sea surface evacuation equipment [20]. In this section, the displacement and deformation response of the inflatable slide under the wind load of 15 m/s, 20 m/s, 25 m/s, and 30\({}^{\circ}\) and 60\({}^{\circ}\) wind directions are simulated. The numerical simulation results are shown in Figure 12.  
The ability of resisting wind speed variations is tested to find out the most dangerous condition of inflatable slide arrangement, which can be used for the wind-load response analysis of the inflatable slide when air pressure changes.  
As shown in Figure 13, according to the results of displacement and deformation of the inflatable slide under different wind speeds, it can be seen that with the increase of wind speed, the displacement and deformation of the inflatable slide under different wind directions increases gradually. The displacement values at a wind direction angle of 30\({}^{\circ}\) are higher than those at a wind direction angle of 60\({}^{\circ}\) at all wind speed monitoring points. The slope of displacement and deformation growth at a direction angle of 30\({}^{\circ}\) is higher than that at a direction angle of 60\({}^{\circ}\). The above shows that the displacement deformation of the inflatable slide under wind load is the largest under the condition of 30\({}^{\circ}\) of wind direction angle, and its ability of resisting wind speed change is poor. To sum up, the wind direction angle of 30\({}^{\circ}\) is the most disadvantageous condition for emergency evacuation of inflatable slide.  
\begin{table}
\begin{tabular}{c c c c c} \hline
**Pressure (Pa)** & **0\({}^{\circ}\)** & **30\({}^{\circ}\)** & **60\({}^{\circ}\)** & **90\({}^{\circ}\)** \\ \hline
3000 (positive pressure) & 155 & 261.5 & 248.3 & 240.3 \\
3000 (negative pressure) & \(-\)902 & \(-\)927 & \(-\)1320 & \(-\)930.5 \\
4000 (positive pressure) & 140 & 247.4 & 241.6 & 231.2 \\
4000 (negative pressure) & \(-\)917 & \(-\)918.7 & \(-\)1263 & \(-\)940.3 \\ \hline \end{tabular}
\end{table}
Table 2: Air pressure distribution of the inflatable slide under different conditional variables.  
Figure 11: Air pressure distribution curves of the inflatable slide at different wind directions.  
Figure 12: Displacement response of inflatable slide under different wind direction angles and different wind speeds. (a) Deformation at 15 m/s wind speed and 30\({}^{\circ}\) wind direction; (b) Deformation at 20 m/s wind speed and 30\({}^{\circ}\) wind direction; (c) Deformation at 25 m/s wind speed and 30\({}^{\circ}\) wind direction; (d) Deformation at 15 m/s wind speed and 60\({}^{\circ}\) wind direction; (e) Deformation at 20 m/s wind speed and 60\({}^{\circ}\) wind direction; (f) Deformation at 25 m/s wind speed and 60\({}^{\circ}\) wind direction.