282 Ë 8 New progress of HTS Maglev vehicle
Fig. 8.23:Schematic diagram of the pre-load method.
Fig. 8.24:Levitation height dependence on
load.without the pre-load process. But there was only a 1-mm decrement when the pre-load
was applied. Thus, the pre-load can suppress the levitation height decay effectively.
The following data will further prove this conclusion.
Table 8.2 compares the measured dynamic results of the pre-load method applied
to the HTS Maglev vehicle model. After the pre-load process, the HTS Maglev vehicle
became more stable indicated by the higher stiffness, damping coefficient and better
anti-vibration performance. It was also found that the levitation height decay was
suppressed by the pre-load method. For example, using the pre-load method, the
levitation decay rate was reduced from 14% to 2.5%.
Tab. 8.2:Enhancement of dynamic stiffness and damping coeflcients after pre-load.
Pre-load k(N/m) c(Ns/m)
No 53,740 144
Yes 87,050 214