The commercial operation of the maglev train has strict requirements for reliability and safety suspension control system. However, due to a large number unmodeled dynamics system, it is difficult obtain precise mathematical model After system been operated long time with high load, will change wear, aging failure components, as well settlement line track. performance degraded. Therefore, this ...

Reflection-based waveform inversion introduces migration and demigration process to retrieve low-wavenumber component from reflection data, but both differenceand correlationbased methods suffer from the cycle-skipping problem when the time shifts change rapidly. In this abstract, we introduce model extension and differential semblance optimization into reflection-based waveform inversion. With...

Velocity-stack inversion is the process of creating a model in velocity space that can correctly reconstruct the measured data. This is usually implemented by minimizing the L2 norm of the data misfit and the L2 norm of the model. Superior velocity space images, with a better separation of primaries and multiples, can be created by minimizing a different norm of the data misfit and a different ...