# Dynamics Test Research of Bounce of Carrier-Based Aircraft Arresting Hook
## 5 Test Results and Analysis
### The Influence of Horizontal Velocity on the Collision Rebound of Arresting Hook  
The inflation pressure of the arresting hook damper is kept at 2 MPa, and the target value of the sinking velocity is 6.4 m/s. The collision rebound test of different horizontal velocity is carried out. The target value of horizontal velocity is taken as 0 km/h, 198.4 km/h, 169.8 km/h, and 142 km/h, respectively. Each horizontal velocity is tested for three times, and the average value of the three test results is taken as the test result. The bounce height and distance of the arresting hook under different horizontal velocities are shown in Table 5, and the stroke curve of the arresting hook damper is shown in Figure 17.  
It can be seen from Table 5 that with the increase of horizontal velocity, the change of bounce height is very small, indicating that the horizontal velocity has little influence on the bounce height which is easy to understand because the horizontal velocity contains no component in the vertical direction. The bounce distance increases with the increase of horizontal velocity, and it is 3.54 m when the horizontal velocity is 141.7 km/h.  
It can be seen from Figure 17 that with the increase of horizontal velocity, there is no obvious change in the damper stroke of the arresting hook. When the horizontal velocity is 198 km/h, the maximum stroke of the damper is 57.7 mm. With the increase of horizontal velocity, the acting force of the arresting hook damper which is irrelevant to horizontal velocity basically has no change, which can easily explain why the stroke of arresting hook damper is almost the same in different conditions.  
The Influence of Inflation Pressure of Arresting hook Damper on the Collision Rebound of Arresting hook  
The target value of sinking velocity is 6.4 m/s, the target input of horizontal velocity is 198.4 km/h, and the impact rebound test of different inflation pressure is carried out. The target value of inflation pressure is 1 MPa, 1.5 MPa, 2 MPa, and 3 MPa, respectively. Each inflation pressure is tested for three times, and the average value of three test results is taken as the test result, as shown in Table 6.  
It can be seen from Table 6 that with the increase of inflation pressure, the bounce height decreases significantly. When the inflation pressure is 1 MPa, the first bounce height is 66 mm. The bounce distance is almost unaffected by the inflation pressure.  
It can be seen from Figure 18 that the stroke of the arresting hook damper also decreases with the increase of the inflation pressure. When the inflation pressure is 3 MPa, the maximum stroke of the damper is 52.7 mm.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Inflation Pressure (MPa)** & **Bounce Height (mm)** & **Bounce Distance (m)** \\ \hline
1 & 66 & 4.96 \\
1.5 & 55 & 4.92 \\
2 & 50.6 & 4.92 \\
3 & 43 & 4.95 \\ \hline \hline \end{tabular}
\end{table}
Table 6: Test result of bounce height and bounce distance with different inflation pressure.  
Figure 17: Changes of stroke length of arresting hook at different horizontal velocity.  
From the point of view of arresting hook bounce, the larger the inflation pressure of arresting hook damper is, the lower the bounce height is, and the higher the success rate of engagement of arresting cable is. However, the arresting hook will be pulled up quickly after it is suspended. At this time, the load in the arresting hook buffer will increase with the increase of the inflation pressure, which may lead to the buffer overload. This part cannot be tested in the test system of this paper for the time being, so it is suggested to select a smaller buffer inflation pressure when the bounce height meets the requirements.