# Dynamic Load Test and Contact Force Analysis of the AERORail Structure
## 1 Introduction
[PERSON] [10] studied a numerical method for the dynamic analysis of vehicles moving on flexible structures with gaps and gained the dynamic contact between a high-speed wheel and elastic beam with Coulomb friction [11]. [PERSON] [12] studied the dynamics and stability of slender structures  
Figure 1: Schematic diagram of the typical structure of AERORail. carrying a moving load or mass with FEM. [PERSON] [13] studied the vibration control of stress ribbon bridges subjected to moving vehicles. Based on the above structural characteristics, AERORail not only has the static and dynamic characteristics of the conventional flexible beam structure but also the vibration and stability under the action of the moving load are closer to the stress ribbon structure [13; 14; 15]. The difference is that the AERORail load acts directly on the rail on the upper part of the prestressed cable and is then transmitted to the cable through the support rod, which is similar to the top-supported suspension cable structure. To ensure the efficiency of AERORail transportation, the support between the cable and the track is not as high as that of the top-mounted suspension cable structure; that is, the catenary span of the cable is relatively small. The rise span ratio is between 1/100 and 1/50, which causes AERORail to look more like a truss with cables parallel to the rail from a distance. At present, research on AERORail structures mainly focuses on the static and dynamic characteristics of the structure. [PERSON] [4; 16] used 1:20 and 1:15 scale models to preliminarily verify the feasibility of the AERORail structure and used the virtual prototype to explore the dynamic and static characteristics of the structure [16]. Numerical analysis of the static deflection of different spans of AERORail under different loads and pretensions was carried out, and the 1:1 full-scale AERORail test was used for verification (Figure 2); the relevant results have been carried out in a special report in China Central Television and China Education Television. At the same time, on this basis, combined with vehicle-bridge coupling theory, the dynamic deflection response of AERORail with different spans is studied, and some useful conclusions are obtained. Existing studies have shown that under the action of low-speed moving loads, the cable stress increment, dynamic deflection and structural stiffness of the AERORail structure do not change significantly; with the increase in cable force and mid-span support height, the structural stiffness increases significantly. There is a nonlinear relationship with dynamic deflection [17; 18]. Although some studies have initially revealed some of the static and dynamic characteristics of the AERORail structure, for engineering applications of related research, these results still cannot satisfy the establishment of relevant design theories and design methods. At present, there are still problems that need to be studied urgently including the static  
Figure 2: Full-scale model test line. and dynamic characteristics of the long-span AERORail structure, the dynamic response of the AERORail structure under high-speed driving conditions, the vehicle-AERORail interaction, and the practical calculation method of the static and dynamic response of the AERORail structure. Based on the existing research results, this paper studies the force between the vehicle and the AERORail structure--the wheel-rail contact force. On the basis of the modal test, the fundamental frequency of the structure is determined. Then the research on the vehicle-rail force under the condition of the vehicle load determines the stability and control requirements during the service of the AERORail and provides a theoretical basis for the design of the structure in the future, especially the arrangement of the vehicle load on the track line. It is also an important guarantee to ensure the safety and usability of the structure.