## 6 Simulation and Experimental Comparison of New Flexible Web
### Comparison of Experimental Results and Simulation  
The grid posture at representative moments in the test process is selected and compared with the simulation results in Section 5 above. The comparison diagram of the new spatial flexible grid configuration between the test and simulation is shown in Figure 30 below.  
Rising in the initial stage, the web twine mutually squeezing phenomenon is evident. The early new space flexible web attitude changes fast when achieving the maximum expansion area, the tractor body is restrained by the new space flexible web twine, the web twine tensions rapidly with new space flexible web prominent body structure retraction, and the web surface expansion area decreases rapidly. After continuing to rise for a short distance, the new space flexible web loses its rising power, falls back rapidly, and the effective deployed area also decreases rapidly. After comparing the test and simulation, it is found that the maximum effective deployment area achieved in the actual test process is smaller than the simulation value, and the mesh holding time in the test is also shorter than the simulation value, which is mainly affected by the inconsistent air resistance between the test and simulation.  
Figure 30: Comparison of new space flexible web experiment and simulation shape under feature moments.  
Figure 29: Timeline of air attitude change in the new spatial flexible web.  
As can be seen from Figure 31, the maximum value of vertical displacement of the new space flexible web in simulation and test is about 20 m, and the simulation value is slightly higher than the test value. The maximum vertical displacement time in the simulation of the new space flexible web is about 2.51 s, peaking earlier than the test results. Values can be found by looking at the flexible web actual test launch of the new space, its displacement peak near the end of the changes is flat, where there are about 1.3 s as the platform.  
The ground test is in good agreement with the simulation results. The effective expansion area of the new space flexible web can reach more than 80% of its maximum size in the air, and the maximum flight altitude error is controlled by 5%. These results show that the new space flexible web has better flight ability in the air.  
In addition to the observation of Figure 30, it can be seen that after 4.2 s, the test value and the simulation value show a significant deviation. This is mainly due to two reasons. On the one hand, the influence of air resistance and other conditions is not considered in the simulation. The launch is only affected by gravity, which is an ideal working condition. However, there is the effect of air resistance during the experiment. On the other hand, in the second half of the test, the wind slowed down the landing process of the flexible web. This also leads to a difference between the test and simulation values simultaneously.  
During the launch and deployment process of the flexible web, the current verification test net size is relatively small, the flight range is close, and the intercept and capture target is mainly stationary or at low speed [19; 20]. The simulation and verification tests of the new symmetrical structure flexible web make up for the above shortcomings and provide a new idea for the research. During the test, the flight height can reach tens of meters and the opening area can reach about 20 square meters.